Journal articles: 'Axion and axion like particles'

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Massó, Eduard. "Axions and axion-like particles." Nuclear Physics B - Proceedings Supplements 114 (February 2003): 67–73. http://dx.doi.org/10.1016/s0920-5632(02)01893-5.

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Stadnik, Yevgeny V., and Victor V. Flambaum. "New atomic probes for dark matter detection: Axions, axion-like particles and topological defects." Modern Physics Letters A 29, no. 37 (December 4, 2014): 1440007. http://dx.doi.org/10.1142/s0217732314400070.

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We present a brief overview of recently proposed detection schemes for axion, axion-like pseudoscalar particle and topological defect dark matter. We focus mainly on the possibility of using atomic and molecular systems for dark matter detection. For axions and axion-like particles, these methods are complementary probes to ongoing photon–axion interconversion experiments and astrophysical observations. For topological defects, these methods are complementary to conventional astrophysical search schemes based on gravitational signatures.

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Caloni, Luca, Martina Gerbino, Massimiliano Lattanzi, and Luca Visinelli. "Novel cosmological bounds on thermally-produced axion-like particles." Journal of Cosmology and Astroparticle Physics 2022, no. 09 (September 1, 2022): 021. http://dx.doi.org/10.1088/1475-7516/2022/09/021.

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Abstract We constrain the coupling of thermally-produced axion-like particles (here axions) with photons and gluons, using data from the cosmic microwave background (CMB) spectra and baryon acoustic oscillations. The axion possesses an explicit soft breaking mass term and it is produced thermally in the early Universe from either axion-photon or axion-gluon processes, accounting for the recent progresses in the field. We derive the most stringent bounds on the axion-gluon coupling to date on the mass range considered 10-4 ≲ ma / eV ≲ 100, superseding the current bounds from SN1987A. The bounds on the axion-photon coupling are competitive with the results from the CAST collaboration for the axion mass ma ≳ 3eV. We comment on the forecast reaches that will be available given the sensitivity of future CMB-S4 missions.

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Flambaum, V. V., H. B. Tran Tan, I. B. Samsonov, Y. V. Stadnik, and D. Budker. "Resonant detection and production of axions with atoms." International Journal of Modern Physics A 33, no. 31 (November 10, 2018): 1844030. http://dx.doi.org/10.1142/s0217751x1844030x.

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The axions and axion-like particles can be detected via a resonant atomic or molecular transition induced by axion absorption. The signal obtained in this process is second order in the axion-electron interaction constant and hence small. In this chapter, it is demonstrated that this signal may become first order in the axion-electron interaction constant if we allow the interference between the axion-induced transition amplitude and the transition amplitude induced by the electromagnetic radiation. Additionally, we show that the conventional scheme of producing axions from photons in a magnetic field may be improved if the field is replaced by an atomic medium in which photons scattering off the atoms in the forward direction are transformed into axions.

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Yang, Qiaoli. "Axions/Axion-like particles and the CMB asymmetric dipole." International Journal of Modern Physics D 24, no. 13 (November 2015): 1545009. http://dx.doi.org/10.1142/s0218271815450091.

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Axions and axion-like particles (ALPs) are very attractive dark matter candidates. In this review, we briefly investigate how the cosmological observations reveal the existence of dark matter and some unique properties of axions/(ALPs) which make them more interesting.

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Li, Chuang, Nick Houston, Tianjun Li, Qiaoli Yang, and Xin Zhang. "A detailed exploration of the EDGES 21cm absorption anomaly and axion-induced cooling." International Journal of Modern Physics D 30, no. 06 (March 22, 2021): 2150041. http://dx.doi.org/10.1142/s0218271821500413.

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The EDGES collaboration’s observation of an anomalously strong 21 cm absorption feature around the cosmic dawn era has energised the cosmological community by suggesting a novel signature of dark matter in the cooling of cosmic hydrogen. In a recent paper, we have argued that by virtue of the ability to mediate cooling processes whilst in the condensed phase, a small amount of axion dark matter can explain these observations within the context of Standard Models of axions and axion-like particles. These axions and axion-like particles (ALPs) can thermalise through gravitational self-interactions and so eventually form a Bose–Einstein condensate (BEC), whereupon large-scale long-range correlation can produce experimentally observable signals such as these. In this context, the EDGES best-fit result favours an ALP mass in the (6, 400) meV range. Future experiments and galaxy surveys, particularly the International Axion Observatory (IAXO) and EUCLID, should have the capability to directly test this scenario. In this paper, we will explore this mechanism in detail and give more thorough computational details of certain key points.

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Zhang, Hong. "Axion Stars." Symmetry 12, no. 1 (December 20, 2019): 25. http://dx.doi.org/10.3390/sym12010025.

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The dark matter particle can be a QCD axion or axion-like particle. A locally over-densed distribution of axions can condense into a bound Bose–Einstein condensate called an axion star, which can be bound by self-gravity or bound by self-interactions. It is possible that a significant fraction of the dark matter axion is in the form of axion stars. This would make some efforts searching for the axion as the dark matter particle more challenging, but at the same time it would also open up new possibilities. Some of the properties of axion stars, including their emission rates and their interactions with other astrophysical objects, are not yet completely understood.

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Avgoustidis, Anastasios. "New Cosmological Constraints on Axions and Axion-Like Particles." Journal of Physics: Conference Series 283 (February 1, 2011): 012003. http://dx.doi.org/10.1088/1742-6596/283/1/012003.

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STEFFEN, JASON H., and AMOL UPADHYE. "THE GammeV SUITE OF EXPERIMENTAL SEARCHES FOR AXION-LIKE PARTICLES." Modern Physics Letters A 24, no. 26 (August 30, 2009): 2053–68. http://dx.doi.org/10.1142/s0217732309031727.

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We report on the design and results of the GammeV search for axion-like particles and for chameleon particles. We also discuss plans for an improved experiment to search for chameleon particles, one which is sensitive to both cosmological and power-law chameleon models. Plans for an improved axion-like particle search using coupled resonant cavities are also presented. This experiment will be more sensitive to axion-like particles than stellar astrophysical models or current helioscope experiments.

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Graham, Peter W., Igor G. Irastorza, Steven K. Lamoreaux, Axel Lindner, and Karl A. van Bibber. "Experimental Searches for the Axion and Axion-Like Particles." Annual Review of Nuclear and Particle Science 65, no. 1 (October 19, 2015): 485–514. http://dx.doi.org/10.1146/annurev-nucl-102014-022120.

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Cadamuro, Davide, and Javier Redondo. "Cosmological constraints on thermal relic axions and axion-like particles." Journal of Physics: Conference Series 375, no. 2 (July 30, 2012): 022002. http://dx.doi.org/10.1088/1742-6596/375/1/022002.

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GUENDELMAN, EDUARDO I., and DORON CHELOUCHE. "RADIO-LOUD MAGNETARS AS DETECTORS FOR AXIONS AND AXION-LIKE PARTICLES." International Journal of Modern Physics E 20, supp02 (December 2011): 100–108. http://dx.doi.org/10.1142/s0218301311040669.

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We show that, by studying the arrival times of radio pulses from highly-magnetized transient beamed sources, it may be possible to detect light pseudo-scalar particles, such as axions and axion-like particles, whose existence could have considerable implications for the strong-CP problem of QCD as well as the dark matter problem in cosmology. Specifically, such light bosons may be detected with a much greater sensitivity, over a broad particle mass range, than is currently achievable by terrestrial experiments, and using indirect astrophysical considerations. The observable effect was discussed in Chelouche & Guendelman (2009), and is akin to the Stern-Gerlach experiment: the splitting of a photon beam naturally arises when finite coupling exists between the electro-magnetic field and the axion field. The splitting angle of the light beams linearly depends on the photon wavelength, the size of the magnetized region, and the magnetic field gradient in the transverse direction to the propagation direction of the photons. If radio emission in radio-loud magnetars is beamed and originates in regions with strong magnetic field gradients, then splitting of individual pulses may be detectable. We quantify the effect for a simplified model for magnetars, and search for radio beam splitting in the 2GHz radio light curves of the radio loud magnetar XTEJ1810-197.

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Galan, Javier. "Exploring the Sun’s core with BabylAXO." Journal of Physics: Conference Series 2156, no. 1 (December 1, 2021): 012014. http://dx.doi.org/10.1088/1742-6596/2156/1/012014.

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Abstract Axions are a natural consequence of the Peccei-Quinn mechanism, the most compelling solution to the strong-CP problem. Similar axion-like particles (ALPs) also appear in a number of possible extensions of the Standard Model, notably in string theories. Both, axions and ALPs, are very well motivated candidates for Dark Matter (DM), and they would be copiously produced at the sun’s core. A relevant effort during the last two decades has been the CAST experiment at CERN, the most sensitive axion helioscope to date. The International Axion Observatory (IAXO) is a large-scale 4th generation helioscope, and its primary physics goal is to extend further the search for solar axions or ALPs with a final signal to background ratio of about 5 orders of magnitude higher. We briefly review here the astrophysical hints and models that will be at reach while searching for solar axions within the context of the IAXO helioscope search program, and in particular the physics under reach for BabyIAXO, an intermediate helioscope stage towards the full IAXO.

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Dafni, Theopisti, and Javier Galán. "Digging into Axion Physics with (Baby)IAXO." Universe 8, no. 1 (January 8, 2022): 37. http://dx.doi.org/10.3390/universe8010037.

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Dark matter searches have been ongoing for three decades; the lack of a positive discovery of the main candidate, the WIMP, after dedicated efforts, has put axions and axion-like particles in the spotlight. The three main techniques employed to search for them complement each other well in covering a wide range in the parameter space defined by the axion decay constant and the axion mass. The International AXion Observatory (IAXO) is an international collaboration planning to build the fourth generation axion helioscope, with an unparalleled expected sensitivity and discovery potential. The distinguishing characteristic of IAXO is that it will feature a magnet that is designed to maximise the relevant parameters in sensitivity and which will be equipped with X-ray focusing devices and detectors that have been developed for axion physics. In this paper, we review aspects that motivate IAXO and its prototype, BabyIAXO, in the axion, and ALPs landscape. As part of this Special Issue, some emphasis is given on Spanish participation in the project, of which CAPA (Centro de Astropartículas y Física de Altas Energías of the Universidad de Zaragoza) is a strong promoter.

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Chadha-Day, Francesca. "Axion-like particle oscillations." Journal of Cosmology and Astroparticle Physics 2022, no. 01 (January 1, 2022): 013. http://dx.doi.org/10.1088/1475-7516/2022/01/013.

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Abstract String theory compactifications may generate many light axion-like particles (ALPs) with weak couplings to electromagnetism. In general, a large number of ALPs may exist, with a linear combination having a potentially observable coupling to electromagnetism. The basis in which only one ALP couples to electromagnetism is in general misaligned with the mass basis. This leads to mixing between the `electromagnetic' ALP and a number of `hidden' ALPs that do not interact directly with the photon. The process is analagous to neutrino oscillations. I will discuss the phenomenological consequences of this mixing for astrophysical ALP signals, in particular showing that it may significantly reduce the predicted signal in experiments such as the CERN Axion Solar Telescope.

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Lee, Billy K. K., Ming-chung Chu, and Lap-Ming Lin. "Could the GW190814 Secondary Component Be a Bosonic Dark Matter Admixed Compact Star?" Astrophysical Journal 922, no. 2 (December 1, 2021): 242. http://dx.doi.org/10.3847/1538-4357/ac2735.

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Abstract We investigate whether the recently observed 2.6 M ⊙ compact object in the gravitational wave event GW190814 can be a bosonic dark matter (DM) admixed compact star. By considering the three constraints of mass, radius, and the stability of such an object, we find that if the DM is made of QCD axions, their particle mass m is constrained to a range that has already been ruled out by the independent constraint imposed by the stellar-mass black hole superradiance process. The 2.6 M ⊙ object can still be a neutron star admixed with at least 2.0 M ⊙ of DM made of axion-like particles (or even a pure axion-like particle star) if 2 × 10−11 eV ≤ m ≤ 2.4 × 10−11 eV (2.9 × 10−11 eV ≤ m ≤ 3.2 × 10−11 eV) with a decay constant of f ≥ 8 × 1017 GeV.

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Zioutas, K., M. Tsagri, Y. Semertzidis, T. Papaevangelou, T. Dafni, and V. Anastassopoulos. "Axion searches with helioscopes and astrophysical signatures for axion(-like) particles." New Journal of Physics 11, no. 10 (October 16, 2009): 105020. http://dx.doi.org/10.1088/1367-2630/11/10/105020.

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Bai, Yang, Xiaolong Du, and Yuta Hamada. "Diluted axion star collisions with neutron stars." Journal of Cosmology and Astroparticle Physics 2022, no. 01 (January 1, 2022): 041. http://dx.doi.org/10.1088/1475-7516/2022/01/041.

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Abstract Diluted axion star, a self-gravitating object with the quantum pressure balancing gravity, has been predicted in many models with a QCD axion or axion-like particle. It can be formed in the early universe and composes a sizable fraction of dark matter. One could detect the transient radio signals when it passes by a magnetar with the axion particle converted into photon in the magnetic field. Using both numerical and semi-analytic approaches, we simulate the axion star's dynamic evolution and estimate the fraction of axion particles that can have a resonance conversion during such a collision event. We have found that both self-gravity and quantum pressure are not important after the diluted axion star enters the Roche radius. A free-fall approximate can capture individual particle trajectories very well. With some optimistic cosmological and astrophysical assumptions, the QCD axion parameter space can be probed from detecting such a collision event by radio telescopes.

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Kachelrieß, M., and J. Tjemsland. "On the origin and the detection of characteristic axion wiggles in photon spectra." Journal of Cosmology and Astroparticle Physics 2022, no. 01 (January 1, 2022): 025. http://dx.doi.org/10.1088/1475-7516/2022/01/025.

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Abstract Photons propagating in an external magnetic field may oscillate into axions or axion-like particles (ALPs). Such oscillations will lead to characteristic features in the energy spectrum of high-energy photons from astrophysical sources that can be used to probe the existence of ALPs. In this work, we revisit the signatures of these oscillations and stress the importance of a proper treatment of turbulent magnetic fields. We implement axions into ELMAG, a standard tool for modelling in a Monte Carlo framework the propagation of gamma-rays in the Universe, complementing thereby the usual description of photon-axion oscillations with a Monte Carlo treatment of high-energy photon propagation and interactions. We also propose an alternative method of detecting axions through the discrete power spectrum using as observable the energy dependence of wiggles in the photon spectra.

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Zioutas, K., K. Dennerl, M. Grande, Dhh Ho mann, J. Huovelin, B. Lakic, S. Orlando, et al. "Indirect signatures for axion(-like) particles." Journal of Physics: Conference Series 39 (May 1, 2006): 103–6. http://dx.doi.org/10.1088/1742-6596/39/1/020.

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DiLella, L., and K. Zioutas. "Observational evidence for axion(-like) particles." Physics Letters B 531, no. 3-4 (April 2002): 175–86. http://dx.doi.org/10.1016/s0370-2693(02)01505-8.

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Capolupo, A., G. Lambiase, and G. Vitiello. "Probing Mixing of Photons and Axion-Like Particles by Geometric Phase." Advances in High Energy Physics 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/826051.

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We find that a geometric phase characterizes the phenomenon of mixing of photons with axion-like particles (ALPs). The laboratory observation of such a phase may provide a novel tool able to detect such a mixing phenomenon. We show that the geometric phase is dependent on the axion-like particle mass and coupling constant. We discuss an interferometric experiment able to detect the geometric phase associated with the ALPs-photon mixing.

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Bukhari, Masroor H. S. "A Table-Top Pilot Experiment for Narrow Mass Range Light Cold Dark Matter Particle Searches." Universe 6, no. 2 (February 3, 2020): 28. http://dx.doi.org/10.3390/universe6020028.

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This report presents the detection framework and a proposal for a pilot table-top experiment (supported by simulations and preliminary test results) for adoption into narrow mass range light Cold Dark Matter (CDM) searches, specifically for axions or Axion-Like Particles (ALPs) in a resonant cavity-based scheme. The novelty of this proposal lies in an attempt to concentrate searches corresponding to specific axion masses of interest (coinciding with recent proposals), using multiple cavities in a symmetric scheme, instead of using noisy and complicated tuning mechanisms, and in reduction of associated hardware by employing simpler underlying instrumentation instead of heterodyne mode of detection, by means of a low-noise ac amplification and dc phase-sensitive detection scheme, in order to make a viable and compact table-top experiment possible. These simplifications could possibly be valuable in substantially reducing detection hardware, experiment complexities (and associated noise) and long run-times, while maintaining low noise similar to conventional axion searches. The feasibility of proposed scheme and the experiment design are demonstrated with some calculations, simulations and preliminary tests with artificial axion signals injected into the cavities. The technique and ideas reported here have significant potential to be developed into a small-scale table-top, narrow-range, dark matter axion/ALP spectroscopy experiment, in addition to aiding in the on-going resonant cavity-based and broadband experiments.

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Garcon, Antoine, John W. Blanchard, Gary P. Centers, Nataniel L. Figueroa, Peter W. Graham, Derek F. Jackson Kimball, Surjeet Rajendran, et al. "Constraints on bosonic dark matter from ultralow-field nuclear magnetic resonance." Science Advances 5, no. 10 (October 2019): eaax4539. http://dx.doi.org/10.1126/sciadv.aax4539.

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The nature of dark matter, the invisible substance making up over 80% of the matter in the universe, is one of the most fundamental mysteries of modern physics. Ultralight bosons such as axions, axion-like particles, or dark photons could make up most of the dark matter. Couplings between such bosons and nuclear spins may enable their direct detection via nuclear magnetic resonance (NMR) spectroscopy: As nuclear spins move through the galactic dark-matter halo, they couple to dark matter and behave as if they were in an oscillating magnetic field, generating a dark-matter–driven NMR signal. As part of the cosmic axion spin precession experiment (CASPEr), an NMR-based dark-matter search, we use ultralow-field NMR to probe the axion-fermion “wind” coupling and dark-photon couplings to nuclear spins. No dark matter signal was detected above background, establishing new experimental bounds for dark matter bosons with masses ranging from 1.8 × 10−16 to 7.8 × 10−14 eV.

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Filatov, Vladimir, Vladimir Gorelik, and Svetlana Pichkurenko. "Stimulated Axion-Like Bipolariton Generation in the Globular Photonic Crystal." Materials Science Forum 1047 (October 18, 2021): 134–39. http://dx.doi.org/10.4028/www.scientific.net/msf.1047.134.

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Axion is the dark particle introduced to the quantum chromodynamics to solve the strong CP-problem. Because of its dark nature, there are many indirect evidences, but axion itself have not been registered till now. In the paper, we report the observation of dark axion-like particles formed by the polariton coupling in the resonant microcavity of a globular photonic crystal. To overcome the very small cross-section, we use the Bose-Einstein condensation of polaritons into the nearest-to-the-surface microcavity of an opal-like globular photonic crystal. This way, the synchronicity conditions are met and all polaritons have the same wavefunction to be coupled. Moreover, the giant density of states of a Bose-condensate makes polariton coupling not only allowed but stimulated. At the experiment, we observe “Light Shining through a Wall” Primakoff effect which proves dark particles. The additional spectral peak at the unitary polariton line of a maximal transparency of a crystal allows to differ bipolaritons from other particles. The results can be used not only to generate dark particles at a lab, but also to get a laboratory source of an optical-frequency gravitational waves.

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Biekötter, Anke, Mikael Chala, and Michael Spannowsky. "New Higgs decays to axion-like particles." Physics Letters B 834 (November 2022): 137465. http://dx.doi.org/10.1016/j.physletb.2022.137465.

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Marsh, M. C. David, Helen R. Russell, Andrew C. Fabian, Brian R. McNamara, Paul Nulsen, and Christopher S. Reynolds. "A new bound on axion-like particles." Journal of Cosmology and Astroparticle Physics 2017, no. 12 (December 21, 2017): 036. http://dx.doi.org/10.1088/1475-7516/2017/12/036.

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Depta, Paul Frederik, Marco Hufnagel, and Kai Schmidt-Hoberg. "Robust cosmological constraints on axion-like particles." Journal of Cosmology and Astroparticle Physics 2020, no. 05 (May 5, 2020): 009. http://dx.doi.org/10.1088/1475-7516/2020/05/009.

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Massó, Eduard, and Javier Redondo. "Evading astrophysical constraints on axion-like particles." Journal of Cosmology and Astroparticle Physics 2005, no. 09 (September 29, 2005): 015. http://dx.doi.org/10.1088/1475-7516/2005/09/015.

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Taoso, Marco. "Detecting axion-like particles at radio frequencies." Journal of Physics: Conference Series 1468 (February 2020): 012019. http://dx.doi.org/10.1088/1742-6596/1468/1/012019.

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Payez, A., J. R. Cudell, and D. Hutsemékers. "New polarimetric constraints on axion-like particles." Journal of Cosmology and Astroparticle Physics 2012, no. 07 (July 20, 2012): 041. http://dx.doi.org/10.1088/1475-7516/2012/07/041.

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Yang, Qiaoli, and Haoran Di. "Axion-like particle dark matter in the linear regime of structure formation." International Journal of Modern Physics A 32, no. 10 (April 6, 2017): 1750051. http://dx.doi.org/10.1142/s0217751x17500518.

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If axion-like particles (ALPs) constitute a major part of dark matter (DM), due to their bosonic nature and a relatively small mass, they could behave differently from the pointlike dark matter particles on the formation of the cosmic structures. When studying the structure formation, it is often useful to consider DM as a special fluid with a given density and a given velocity. ALP fluid obeys the same continuity equation compared to the pointlike collisionless DM, but has a different first-order velocity equation. In the linear regime of structure formation, the resulted observational differences are negligible for the QCD axions but can be interesting for very light ALPs.

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Batković, Ivana, Alessandro De Angelis, Michele Doro, and Marina Manganaro. "Axion-Like Particle Searches with IACTs." Universe 7, no. 6 (June 5, 2021): 185. http://dx.doi.org/10.3390/universe7060185.

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The growing interest in axion-like particles (ALPs) stems from the fact that they provide successful theoretical explanations of physics phenomena, from the anomaly of the CP-symmetry conservation in strong interactions to the observation of an unexpectedly large TeV photon flux from astrophysical sources, at distances where the strong absorption by the intergalactic medium should make the signal very dim. In this latter condition, which is the focus of this review, a possible explanation is that TeV photons convert to ALPs in the presence of strong and/or extended magnetic fields, such as those in the core of galaxy clusters or around compact objects, or even those in the intergalactic space. This mixing affects the observed γ-ray spectrum of distant sources, either by signal recovery or the production of irregularities in the spectrum, called ‘wiggles’, according to the specific microscopic realization of the ALP and the ambient magnetic field at the source, and in the Milky Way, where ALPs may be converted back to γ rays. ALPs are also proposed as candidate particles for the Dark Matter. Imaging Atmospheric Cherenkov telescopes (IACTs) have the potential to detect the imprint of ALPs in the TeV spectrum from several classes of sources. In this contribution, we present the ALP case and review the past decade of searches for ALPs with this class of instruments.

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Bruce, S. A., and J. F. Diaz-Valdes. "Model of nonlinear axion-electrodynamics." International Journal of Modern Physics D 30, no. 04 (January 25, 2021): 2150025. http://dx.doi.org/10.1142/s0218271821500255.

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Within the framework of a derivable construction of QED, a formulation of nonlinear axion-electrodynamics is investigated. This approach is intended to predict possible strong-QED processes with a discussion of the role of axion-like particles that might be significant in nonlinear electrodynamics (NLED). We introduce a nonlinear model of axion-electrodynamics with remaining questions to be further explored.

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Cuesta, A. J., M. E. Gómez, J. I. Illana, and M. Masip. "Cosmology of an axion-like majoron." Journal of Cosmology and Astroparticle Physics 2022, no. 04 (April 1, 2022): 009. http://dx.doi.org/10.1088/1475-7516/2022/04/009.

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Abstract We propose a singlet majoron model that defines an inverse seesaw mechanism in the ν sector. The majoron ϕ has a mass mϕ ≈ 0.5 eV and a coupling to the τ lepton similar to the one to neutrinos. In the early universe it is initially in thermal equilibrium, then it decouples at T ≈ 500 GeV and contributes with just ΔN eff = 0.026 during BBN. At T = 26 keV (final stages of BBN) a primordial magnetic field induces resonant γ ⟷ ϕ oscillations that transfer 6% of the photon energy into majorons, implying ΔN eff = 0.55 and a 4.7% increase in the baryon to photon ratio. At T ≈ mϕ the majoron enters in thermal contact with the heaviest neutrino and it finally decays into νν̅ pairs near recombination, setting ΔN eff = 0.85. The boost in the expansion rate at later times may relax the Hubble tension (we obtain H 0 = (71.4 ± 0.5) km/s/Mpc), while the processes νν̅ ⟷ ϕ suppress the free streaming of these particles and make the model consistent with large scale structure observations. Its lifetime and the fact that it decays into neutrinos instead of photons lets this axion-like majoron avoid the strong bounds that affect other axion-like particles of similar mass and coupling to photons.

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Straniero, O., C. Pallanca, E. Dalessandro, I. Domínguez, F. R. Ferraro, M. Giannotti, A. Mirizzi, and L. Piersanti. "The RGB tip of galactic globular clusters and the revision of the axion-electron coupling bound." Astronomy & Astrophysics 644 (December 2020): A166. http://dx.doi.org/10.1051/0004-6361/202038775.

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Context. The production of neutrinos by plasma oscillations is the most important energy sink process operating in the degenerate core of low-mass red giant stars. This process counterbalances the release of energy induced by nuclear reactions and gravitational contraction, and determines the luminosity attained by a star at the moment of the He ignition. This occurrence coincides with the tip of the red giant branch (RGB), whose luminosity is extensively used as a calibrated standard candle in several cosmological studies. Aims. We aim to investigate the possible activation of additional energy sink mechanisms, as predicted by many extensions of the so-called Standard Model. In particular, our objective is to test the possible production of axions or axion-like particles, mainly through their coupling with electrons. Methods. By combining Hubble Space Telescope and ground-based optical and near-infrared photometric samples, we derived the RGB tip absolute magnitude of 22 galactic globular clusters (GGCs). The effects of varying the distance and the metallicity scales were also investigated. Then we compared the observed tip luminosities with those predicted by state-of-the-art stellar models that include the energy loss due to the axion production in the degenerate core of red giant stars. Results. We find that theoretical predictions including only the energy loss by plasma neutrinos are, in general, in good agreement with the observed tip bolometric magnitudes, even though the latter are ∼0.04 mag brighter on average. This small shift may be the result of systematic errors affecting the evaluation of the RGB tip bolometric magnitudes, or, alternatively, it could be ascribed to an axion-electron coupling causing a non-negligible thermal production of axions. In order to estimate the strength of this possible axion sink, we performed a cumulative likelihood analysis using the RGB tips of the whole set of 22 GGCs. All the possible sources of uncertainties affecting both the measured bolometric magnitudes and the corresponding theoretical predictions were carefully considered. As a result, we find that the value of the axion-electron coupling parameter that maximizes the likelihood probability is gae/10−13 ∼ 0.60−0.58+0.32. This hint is valid, however, if the dominant energy sinks operating in the core of red giant stars are standard neutrinos and axions coupled with electrons. Any additional energy-loss process, not included in the stellar models, would reduce such a hint. Nevertheless, we find that values gae/10−13 > 1.48 can be excluded with 95% confidence. Conclusions. The new bound we find represents the most stringent constraint for the axion-electron coupling available so far. The new scenario that emerges after this work represents a greater challenge for future experimental axion searches. In particular, we can exclude that the recent signal seen by the XENON1T experiment was due to solar axions.

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37

Galanti, Giorgio, and Marco Roncadelli. "Axion-like Particles Implications for High-Energy Astrophysics." Universe 8, no. 5 (April 20, 2022): 253. http://dx.doi.org/10.3390/universe8050253.

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We offer a pedagogical introduction to axion-like particles (ALPs) as far as their relevance for high-energy astrophysics is concerned, from a few MeV to 1000 TeV. This review is self-contained, in such a way to be understandable even to non-specialists. Among other things, we discuss two strong hints at a specific ALP that emerge from two very different astrophysical situations. More technical matters are contained in three Appendices.

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38

Mori, Kanji. "Axion-like Particles from Nearby Type Ia Supernovae." EPJ Web of Conferences 260 (2022): 06003. http://dx.doi.org/10.1051/epjconf/202226006003.

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Axion-like particles (ALPs) are a class of hypothetical pseudo-scalar particles and can be created in hot astrophysical plasma through the interaction between photons. I calculate the production of ALPs in type Ia supernovae. It is found that many ALPs lighter than a few MeV can be produced in type Ia supernovae. Once produced, heavy ALPs decay into photons during propagation in the interstellar space. I calculate the flux of the decay photons and find that it may be detected by future MeV γ-ray telescopes if a type Ia supernova explodes near the Solar System.

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39

Conrad, J., M. Meyer, and D. Montanino. "Axion-Like particles from extragalactic High Energy sources." Journal of Physics: Conference Series 718 (May 2016): 052026. http://dx.doi.org/10.1088/1742-6596/718/5/052026.

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40

Burrage, C. "Searching for axion-like-particles in the sky." Nuclear Physics B - Proceedings Supplements 194 (October 2009): 190–95. http://dx.doi.org/10.1016/j.nuclphysbps.2009.07.022.

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41

Davier, M., J. Jeanjean, and H. Nguyen Ngoc. "Search for axion-like particles in electron bremsstrahlung." Physics Letters B 180, no. 3 (November 1986): 295–98. http://dx.doi.org/10.1016/0370-2693(86)90313-8.

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Sabiu, Cristiano G., Kenji Kadota, Jacobo Asorey, and Inkyu Park. "Probing ultra-light axion dark matter from 21 cm tomography using Convolutional Neural Networks." Journal of Cosmology and Astroparticle Physics 2022, no. 01 (January 1, 2022): 020. http://dx.doi.org/10.1088/1475-7516/2022/01/020.

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Abstract We present forecasts on the detectability of Ultra-light axion-like particles (ULAP) from future 21 cm radio observations around the epoch of reionization (EoR). We show that the axion as the dominant dark matter component has a significant impact on the reionization history due to the suppression of small scale density perturbations in the early universe. This behavior depends strongly on the mass of the axion particle. Using numerical simulations of the brightness temperature field of neutral hydrogen over a large redshift range, we construct a suite of training data. This data is used to train a convolutional neural network that can build a connection between the spatial structures of the brightness temperature field and the input axion mass directly. We construct mock observations of the future Square Kilometer Array survey, SKA1-Low, and find that even in the presence of realistic noise and resolution constraints, the network is still able to predict the input axion mass. We find that the axion mass can be recovered over a wide mass range with a precision of approximately 20%, and as the whole DM contribution, the axion can be detected using SKA1-Low at 68% if the axion mass is M X < 1.86 × 10-20 eV although this can decrease to M X < 5.25 × 10-21 eV if we relax our assumptions on the astrophysical modeling by treating those astrophysical parameters as nuisance parameters.

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Bolliet, Boris, Jens Chluba, and Richard Battye. "Spectral distortion constraints on photon injection from low-mass decaying particles." Monthly Notices of the Royal Astronomical Society 507, no. 3 (July 29, 2021): 3148–78. http://dx.doi.org/10.1093/mnras/stab1997.

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ABSTRACT Spectral distortions (SDs) of the cosmic microwave background (CMB) provide a powerful tool for studying particle physics. Here we compute the distortion signals from decaying particles that convert directly into photons at different epochs during cosmic history, focusing on injection energies $E_\mathrm{inj}\lesssim 20\, \mathrm{keV}$. We deliver a comprehensive library of SD solutions, using CosmoTherm to compute the SD signals, including effects on the ionization history and opacities of the Universe, and blackbody-induced stimulated decay. Then, we use data from COBE/FIRAS and EDGES to constrain the properties of the decaying particles. We explore scenarios where these provide a dark matter (DM) candidate or constitute only a small fraction of DM. We complement the SD constraints with CMB anisotropy constraints, highlighting new effects from injections at very-low photon energies ($h\nu \lesssim 10^{-4}\, {\rm eV}$). Our model-independent constraints exhibit rich structures in the lifetime-energy domain, covering injection energies Einj ≃ 10−10 eV − 10 keV and lifetimes $\tau _X\simeq 10^5-10^{33}\, \mathrm{s}$. We discuss the constraints on axions and axion-like particles, revising existing SD constraints in the literature. Our limits are competitive with other constraints for axion masses $m_a c^2\gtrsim 27\, {\rm eV}$ and we find that simple estimates based on the overall energetics are generally inaccurate. Future CMB spectrometers could significantly improve the obtained constraints, thus providing an important complementary probe of early-universe particle physics.

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V. Kirpichnikov, Dmitri, Valery E. Lyubovitskij, and Alexey S. Zhevlakov. "Constraints on CP-Odd ALP Couplings from EDM Limits of Fermions." Particles 3, no. 4 (December 16, 2020): 719–28. http://dx.doi.org/10.3390/particles3040047.

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We discuss constraints on soft CP-violating couplings of axion-like particles with photon and fermions by using data on electric dipole moments of standard model particles. In particular, for the axion-like particle (ALP) leptophilic scenario, we derive bounds on CP-odd ALP-photon-photon coupling from data of the ACME collaboration on electron EDM. We also discuss prospects of the storage ring experiment to constrain the ALP–photon–photon coupling from data on proton EDM for the simplified hadrophilic interactions of ALP. The resulting constraints from experimental bounds on the muon and neutron EDMs are weak. We set constraint on the CP-odd ALP coupling with electron and derive bounds on combinations of coupling constants, which involve soft CP-violating terms.

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Kitajima, Naoya, Fumiaki Kozai, Fuminobu Takahashi, and Wen Yin. "Power spectrum of domain-wall network, and its implications for isotropic and anisotropic cosmic birefringence." Journal of Cosmology and Astroparticle Physics 2022, no. 10 (October 1, 2022): 043. http://dx.doi.org/10.1088/1475-7516/2022/10/043.

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Abstract Recently, based on a novel analysis of the Planck satellite data, a hint of a uniform rotation of the polarization of cosmic microwave background photons, called isotropic cosmic birefringence, has been reported. The suggested rotation angle of polarization of about 0.2–0.4 degrees is close to the fine-structure constant, α ≃ 1/137 rad ≃ 0.42 deg. Interestingly, this coincidence can be naturally explained over a very wide parameter range by the domain walls of axion-like particles. Furthermore, the axion-like particle domain walls predict not only isotropic cosmic birefringence but also anisotropic one that reflects the spatial distribution of the axion-like particle field on the last scattering surface. In this paper, we perform lattice simulations of the formation and evolution of domain walls in the expanding universe and obtain for the first time the two-point correlation function and power spectrum of the scalar field that constitutes the domain walls. We find that for initial fluctuations at subhorizon scales, the power spectrum is roughly consistent with analytical predictions based on random wall distributions. However, there is some excess at scales corresponding to the Hubble radius. Applying our results to the anisotropic cosmic birefringence, we predict the power spectrum of the rotation angles induced by the axion-like particle domain walls for the similar initial condition, and show that it is within reach of future observations of the cosmic microwave background.

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Mostepanenko, V. M. "Progress in constraining axion and non-Newtonian gravity from the Casimir effect." International Journal of Modern Physics A 31, no. 02n03 (January 20, 2016): 1641020. http://dx.doi.org/10.1142/s0217751x16410207.

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We consider recent progress in constraining the axion-nucleon coupling constants and the Yukawa-type corrections to Newtonian gravity from experiments on measuring the Casimir interaction. After a brief review of previously obtained constraints, we concentrate on the new Casimir-less experiment, which allows to strengthen the known results up to factors of 60 and 1000 for the axion-like particles and Yukawa-type corrections, respectively. We also discuss possibilities allowing to further strengthen the constraints on axion-nucleon coupling constants, and propose a new experiment aiming to achieve this goal.

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Arias, Paola, Ariel Arza, Joerg Jaeckel, and Diego Vargas-Arancibia. "Hidden photon dark matter interacting via axion-like particles." Journal of Cosmology and Astroparticle Physics 2021, no. 05 (May 1, 2021): 070. http://dx.doi.org/10.1088/1475-7516/2021/05/070.

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Day, Francesca, and Sven Krippendorf. "Searching for Axion-Like Particles with X-ray Polarimeters." Galaxies 6, no. 2 (April 10, 2018): 45. http://dx.doi.org/10.3390/galaxies6020045.

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49

Berezhiani, Zurab, and Alessandro Drago. "Gamma ray bursts via emission of axion-like particles." Physics Letters B 473, no. 3-4 (February 2000): 281–90. http://dx.doi.org/10.1016/s0370-2693(99)01449-5.

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Tam, H., and Q. Yang. "Production and detection of axion-like particles by interferometry." Physics Letters B 716, no. 3-5 (October 2012): 435–40. http://dx.doi.org/10.1016/j.physletb.2012.08.050.

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Journal articles on the topic 'Axion and axion like particles'

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