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Journal articles on the topic 'Axion cosmology'

Author: Grafiati

Published: 14 March 2023

Last updated: 31 July 2025

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1

Marsh, David J. E. "Axion cosmology." Physics Reports 643 (July 2016): 1–79. http://dx.doi.org/10.1016/j.physrep.2016.06.005.

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2

Chen, Chong-Bin, and Jiro Soda. "Implications of multi-axion dark matter on structure formation." Journal of Cosmology and Astroparticle Physics 2023, no. 06 (2023): 049. http://dx.doi.org/10.1088/1475-7516/2023/06/049.

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Abstract Axions are candidates for dark matter in the universe.We develop an accurate Boltzmann code to calculate the linear growth of the plasma. As an interesting example, we investigate a mixed dark matter model consisting of cold dark matter (CDM) and two-axion dark matter. We analyze the growth of the structure numerically and analytically. We find that an effective single axion with an effective mass and an effective abundance is useful to characterize the two-axion cosmology. Moreover, we generalize the effective single axion description to multi-axion dark matter cosmology. We also com

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3

Turner, Michael S., and Frank Wilczek. "Inflationary axion cosmology." Physical Review Letters 66, no. 1 (1991): 5–8. http://dx.doi.org/10.1103/physrevlett.66.5.

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4

Bachlechner, Thomas C., Kate Eckerle, Oliver Janssen, and Matthew Kleban. "Axion landscape cosmology." Journal of Cosmology and Astroparticle Physics 2019, no. 09 (2019): 062. http://dx.doi.org/10.1088/1475-7516/2019/09/062.

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5

LYTH, D. H. "Inflationary Axion Cosmology." Annals of the New York Academy of Sciences 647, no. 1 Texas/ESO-Cer (1991): 736–42. http://dx.doi.org/10.1111/j.1749-6632.1991.tb32226.x.

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6

CHOI, KIWOON. "THERMAL PRODUCTION OF AXINO DARK MATTER." International Journal of Modern Physics: Conference Series 10 (January 2012): 107–14. http://dx.doi.org/10.1142/s2010194512005818.

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We discuss certain features of the low energy effective interactions of axion supermultiplet, which are relevant for axino cosmology, and examine the implication to thermal production of axino in the early Universe.

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7

Zhao, Wenhao, and Yuqi Zhu. "The properties of axion with three different sets of parameters in two flavor Nambu-Jona-Lasinio model." Journal of Physics: Conference Series 2882, no. 1 (2024): 012061. http://dx.doi.org/10.1088/1742-6596/2882/1/012061.

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Abstract While the properties of axions have been studied primarily through high-energy physics and cosmology, there are some potential connections between the research results and the aerospace field. We study the properties of axions in hot and dense matter with three different sets of parameters in the Nambu-Jona-Lasinio model, including axion mass and self-coupling. We discussed axion mass and self-coupling, noting that axion properties are very sensitive to chiral phase transitions for three sets of parameters. The axion mass and self-coupling rapidly decrease in the chiral crossover regi

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8

Patrascu, Andrei T. "H0 Tensions in Cosmology and Axion Pseudocycles in the Stringy Universe." Universe 8, no. 10 (2022): 500. http://dx.doi.org/10.3390/universe8100500.

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The tension between early and late H0 is revised in the context of axion dark matter arising naturally from string theoretical integrations of antisymmetric tensor fields over non-trivial cycles. Certain early universe cycles may appear non-trivial from the perspective of a homology analysis focused on the early universe, while they may become trivial when analysed from the perspective of a homology theory reaching out to lower energies and later times. Such phenomena can introduce variations in the axion potential that would explain the observed H0 tension. The decay of such pseudo-axions whe

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9

Smith, Adam, Maria Mylova, Philippe Brax, Carsten van de Bruck, C. P. Burgess, and Anne-Christine Davis. "CMB implications of multi-field axio-dilaton cosmology." Journal of Cosmology and Astroparticle Physics 2024, no. 12 (2024): 058. https://doi.org/10.1088/1475-7516/2024/12/058.

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Abstract Axio-dilaton models are among the simplest scalar-tensor theories that contain the two-derivative interactions that naturally compete at low energies with the two-derivative interactions of General Relativity. Such models are well-motivated as the low energy fields arising from string theory compactification. We summarize these motivations and compute their cosmological evolution, in which the dilaton acts as dark energy and its evolution provides a framework for dynamically evolving particle masses. The derivative axion-dilaton couplings play an important role in the success of these

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10

Linde, A. D. "Inflation and axion cosmology." Physics Letters B 201, no. 4 (1988): 437–39. http://dx.doi.org/10.1016/0370-2693(88)90597-7.

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11

MAHARANA, JNANADEVA. "SYMMETRIES OF AXION–DILATON STRING COSMOLOGY." International Journal of Modern Physics A 20, no. 07 (2005): 1441–69. http://dx.doi.org/10.1142/s0217751x05021105.

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The axion–dilaton string effective action is expressed in Einstein frame metric in a manifestly S-duality invariant form. It is shown that the moduli can be redefined to describe surface of a (2+1)-dimensional pseudosphere. The classical cosmological solutions of axion–dilaton are revisited. The Wheeler–DeWitt equation for the system is exactly solved and complete set of eigenfunctions are presented. The wave function factorizes and the one depending on the moduli is obtained by appealing to the underlying S-duality symmetry. Axion and dilaton parametrize [Formula: see text], the S-duality gro

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12

SIKIVIE, P. "DARK MATTER AXIONS." International Journal of Modern Physics A 25, no. 02n03 (2010): 554–63. http://dx.doi.org/10.1142/s0217751x10048846.

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The hypothesis of an 'invisible' axion was made by Misha Shifman and others, approximately thirty years ago. It has turned out to be an unusually fruitful idea, crossing boundaries between particle physics, astrophysics and cosmology. An axion with mass of order 10-5 eV (with large uncertainties) is one of the leading candidates for the dark matter of the universe. It was found recently that dark matter axions thermalize and form a Bose-Einstein condensate (BEC). Because they form a BEC, axions differ from ordinary cold dark matter (CDM) in the non-linear regime of structure formation and upon

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13

Kallosh, Renata, та Andrei Linde. "Double exponents in SL(2,ℤ) cosmology". Journal of Cosmology and Astroparticle Physics 2025, № 07 (2025): 062. https://doi.org/10.1088/1475-7516/2025/07/062.

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Abstract SL(2,ℤ) invariant α-attractor models proposed in [1] have plateau potentials with respect to the inflaton and axion fields. The slope of the potential in the inflaton direction is exponentially suppressed at large values of the inflaton field, but the slope of the potential in the axion direction is double-exponentially suppressed. Therefore, the axion field remains nearly massless and practically does not change during inflation. The inflationary trajectory in such models is stable with respect to quantum fluctuations of the axion field. We show that isocurvature perturbations do not

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14

Arias, Paola, Nicolás Bernal, Dimitrios Karamitros, Carlos Maldonado, Leszek Roszkowski, and Moira Venegas. "New opportunities for axion dark matter searches in nonstandard cosmological models." Journal of Cosmology and Astroparticle Physics 2021, no. 11 (2021): 003. http://dx.doi.org/10.1088/1475-7516/2021/11/003.

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Abstract We study axion dark matter production from a misalignment mechanism in scenarios featuring a general nonstandard cosmology. Before the onset of Big Bang nucleosynthesis, the energy density of the universe is dominated by a particle field ϕ described by a general equation of state ω. The ensuing enhancement of the Hubble expansion rate decreases the temperature at which axions start to oscillate, opening this way the possibility for axions heavier than in the standard window. This is the case for kination, or in general for scenarios with ω > 1/3. However, if ω < 1/3, as in the c

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15

Saharian, A. A., and A. V. Timoshkin. "The Holographic cosmology with axion field." International Journal of Geometric Methods in Modern Physics 18, no. 11 (2021): 2150174. http://dx.doi.org/10.1142/s0219887821501747.

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In this paper, we considered an axion F(R) gravity model and described, with the help of holographic principle, the cosmological models of viscous dark fluid coupled with axion matter in a spatially flat Friedmann–Robertson–Walker (FRW) universe. This description based on generalized infrared-cutoff holographic dark energy was proposed by Nojiri and Odintsov. We explored the Little Rip, the Pseudo Rip, and the power-law bounce cosmological models in terms of the parameters of the inhomogeneous equation of the state of viscous dark fluid and calculated the infrared cutoffs analytically. We repr

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16

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 (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

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17

Catena, Riccardo, and Jan Möller. "Axion–dilaton cosmology and dark energy." Journal of Cosmology and Astroparticle Physics 2008, no. 03 (2008): 012. http://dx.doi.org/10.1088/1475-7516/2008/03/012.

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18

Hashimoto, M., K. I. Izawa, M. Yamaguchi, and T. Yanagida. "Axion cosmology with its scalar superpartner." Physics Letters B 437, no. 1-2 (1998): 44–50. http://dx.doi.org/10.1016/s0370-2693(98)00887-9.

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19

Mazde, Kratika, and Luca Visinelli. "The interplay between the dark matter axion and primordial black holes." Journal of Cosmology and Astroparticle Physics 2023, no. 01 (2023): 021. http://dx.doi.org/10.1088/1475-7516/2023/01/021.

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Abstract If primordial black holes (PBHs) had come to dominate the energy density of the early Universe when oscillations in the axion field began, we show that the relic abundance and expected mass range of the QCD axion would be greatly modified. Since the QCD axion is a potential candidate for dark matter (DM), we refer to it as the DM axion. We predominantly explore PBHs in the mass range (106 - 5× 108)g. We investigate the relation between the relic abundance of DM axions and the parameter space of PBHs. We numerically solve the set of Boltzmann equations, that governs the cosmological ev

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20

BECK, CHRISTIAN. "TESTING AXION PHYSICS IN A JOSEPHSON JUNCTION ENVIRONMENT." Modern Physics Letters A 26, no. 38 (2011): 2841–52. http://dx.doi.org/10.1142/s0217732311037248.

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We suggest that experiments based on Josephson junctions, SQUIDS, and coupled Josephson qubits may be used to construct a resonant environment for dark matter axions. We propose experimental setups in which axionic interaction strengths in a Josephson junction environment can be tested, similar in nature to recent experiments that test for quantum entanglement of two coupled Josephson qubits. We point out that the parameter values relevant for early-universe axion cosmology are accessible with present day's achievements in nanotechnology. We work out how typical dark matter and dark energy sig

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21

Evans, Nick, Stephen D. H. Hsu, Andreas Nyffeler та Myckola Schwetz. "QCD at large θ-angle axion cosmology". Nuclear Physics B 494, № 1-2 (1997): 200–210. http://dx.doi.org/10.1016/s0550-3213(97)00174-0.

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22

Maharana, Jnanadeva. "Novel symmetries in axion-dilaton string cosmology." Physics Letters B 549, no. 1-2 (2002): 7–12. http://dx.doi.org/10.1016/s0370-2693(02)02867-8.

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23

Hiramatsu, Takashi, Masahiro Kawasaki, Ken'ichi Saikawa, and Toyokazu Sekiguchi. "Axion cosmology with long-lived domain walls." Journal of Cosmology and Astroparticle Physics 2013, no. 01 (2013): 001. http://dx.doi.org/10.1088/1475-7516/2013/01/001.

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24

Kim, Jihn E. "The invisible axion, the gravitino and cosmology." Nuclear Physics B 252 (January 1985): 245–60. http://dx.doi.org/10.1016/0550-3213(85)90440-7.

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25

POLLOCK, M. D. "ON THE COSMOLOGY OF THE AXION IN THE HETEROTIC SUPERSTRING THEORY." International Journal of Modern Physics D 01, no. 02 (1992): 407–25. http://dx.doi.org/10.1142/s0218271892000227.

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The heterotic superstring theory, after reduction to four dimensions, is known to contain two axions, found by Witten, and studied further by Choi and Kim. One combination of these can be identified with the axion of Peccei and Quinn, whose energy scale is then given by the formula [Formula: see text], where [Formula: see text] is the ratio of the two separate energy scales, g s is the strong-interaction coupling constant and M P ≡G−1/2 is the Planck mass, G being the Newton gravitational constant. This agrees with the result obtained by Choi and Kim, apart from a factor of [Formula: see text]

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26

Bakas, Ioannis, Domenico Orlando, and Panagiotis Marios Petropoulos. "Ricci flows and expansion in axion-dilaton cosmology." Journal of High Energy Physics 2007, no. 01 (2007): 040. http://dx.doi.org/10.1088/1126-6708/2007/01/040.

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27

Mukherji, Sudipta. "A Note on Brans–Dicke Cosmology with Axion." Modern Physics Letters A 12, no. 09 (1997): 639–45. http://dx.doi.org/10.1142/s0217732397000662.

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We study the Brans–Dicke model in the presence of an axion. The dynamical equations are solved when the fields are space-independent and the metric is spatially flat. It is found that at late time the scale factor undergoes decelerated expansion but the dilaton grows large. At early time, scale factor and the dilaton approach constants.

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28

Orlando, Domenico. "Axion-dilaton cosmology, Ricci flows and integrable structures." Nuclear Physics B - Proceedings Supplements 171 (September 2007): 304–5. http://dx.doi.org/10.1016/j.nuclphysbps.2007.06.041.

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29

Sullivan, James M., Shingo Hirano, and Volker Bromm. "Minimum star-forming halo mass in axion cosmology." Monthly Notices of the Royal Astronomical Society: Letters 481, no. 1 (2018): L69—L73. http://dx.doi.org/10.1093/mnrasl/sly164.

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30

Holman, R., and Thomas W. Kephart. "Axion cosmology in automatic E6 × U(1) models." Physics Letters B 167, no. 2 (1986): 169–72. http://dx.doi.org/10.1016/0370-2693(86)90593-9.

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31

Lyth, David H., and Ewan D. Stewart. "Constraining the inflationary energy scale from axion cosmology." Physics Letters B 283, no. 3-4 (1992): 189–93. http://dx.doi.org/10.1016/0370-2693(92)90006-p.

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32

Rosenberg, Leslie J. "Dark-matter QCD-axion searches." Proceedings of the National Academy of Sciences 112, no. 40 (2015): 12278–81. http://dx.doi.org/10.1073/pnas.1308788112.

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In the late 20th century, cosmology became a precision science. Now, at the beginning of the next century, the parameters describing how our universe evolved from the Big Bang are generally known to a few percent. One key parameter is the total mass density of the universe. Normal matter constitutes only a small fraction of the total mass density. Observations suggest this additional mass, the dark matter, is cold (that is, moving nonrelativistically in the early universe) and interacts feebly if at all with normal matter and radiation. There’s no known such elementary particle, so the strong

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33

Russo, Jorge G. "New exact solutions in multi-scalar field cosmology." Journal of Cosmology and Astroparticle Physics 2023, no. 07 (2023): 066. http://dx.doi.org/10.1088/1475-7516/2023/07/066.

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Abstract We use the method of the superpotential to derive exact solutions describing inflationary cosmologies in multi-field models. An example that describes a solution that interpolates between two de Sitter universes is described in detail. New analytical solutions for axion-dilaton cosmologies are also presented.

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34

Sun, Chen, Manuel A. Buen-Abad, and JiJi Fan. "Probing New physics with high-redshift quasars: axions and non-standard cosmology." Journal of Cosmology and Astroparticle Physics 2024, no. 06 (2024): 037. http://dx.doi.org/10.1088/1475-7516/2024/06/037.

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Abstract The Hubble diagram of quasars, as candidates to “standardizable” candles, has been used to measure the expansion history of the Universe at late times, up to very high redshifts (z ∼ 7). It has been shown that this history, as inferred from the quasar dataset, deviates at ≳ 3σ level from the concordance (ΛCDM) cosmology model preferred by the cosmic microwave background (CMB) and other datasets. In this article, we investigate whether new physics beyond ΛCDM (BΛCDM) or beyond the Standard Model (BSM) could make the quasar data consistent with the concordance model. We first show that

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35

Maharana, Jnanadeva, Sudipta Mukherji, and Sudhakar Panda. "Notes on Axion, Inflation and Graceful Exit in Stringy Cosmology." Modern Physics Letters A 12, no. 07 (1997): 447–56. http://dx.doi.org/10.1142/s0217732397000467.

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We study the classical equations of motion and the corresponding Wheeler–De Witt equations for tree level string effective action with dilaton and axion. The graceful exit problem in certain cases is then analyzed.

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36

Borsanyi, Sz, M. Dierigl, Z. Fodor, et al. "Axion cosmology, lattice QCD and the dilute instanton gas." Physics Letters B 752 (January 2016): 175–81. http://dx.doi.org/10.1016/j.physletb.2015.11.020.

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37

Cheek, Andrew, Jacek K. Osiński, and Leszek Roszkowski. "Extending preferred axion models via heavy-quark induced early matter domination." Journal of Cosmology and Astroparticle Physics 2024, no. 03 (2024): 061. http://dx.doi.org/10.1088/1475-7516/2024/03/061.

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Abstract We examine the cosmological consequences of the heavy quarks in KSVZ-type axion models. We find that their presence often causes an early matter domination phase, altering the evolution of the Universe. This extends the axion mass into the region where standard cosmology leads to overproduction, and allows for a greater number of axion models with non-renormalizable terms to be viable. Quantitatively, we find that decays proceeding through effective terms of up to dimension 9 (d = 9) remain consistent with cosmological constraints, in contrast with the result d ≤ 5 previously found in

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38

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 (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 discusse

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39

Dimastrogiovanni, Ema, Matteo Fasiello, Martino Michelotti, and Lucas Pinol. "Primordial gravitational waves in non-minimally coupled chromo-natural inflation." Journal of Cosmology and Astroparticle Physics 2024, no. 02 (2024): 039. http://dx.doi.org/10.1088/1475-7516/2024/02/039.

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Abstract We consider inflation driven by an axion-like particle coupled to an SU(2) gauge sector via a Chern-Simons term. Known as chromo-natural inflation, this scenario is in tension with CMB observations. In order to remedy this fact and preserve both the symmetries and the intriguing gravitational wave phenomenology exhibited by the model, we explore the non-minimal coupling of the axion-inflaton to the Einstein tensor. We identify regions of parameter space corresponding to a viable cosmology at CMB scales. We also highlight the possibility of a non-trivial chiral gravitational wave signa

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40

Brandenberger, Robert, Vahid Kamali, and Rudnei O. Ramos. "Decay of ALP condensates via gravitation-induced resonance." Journal of Cosmology and Astroparticle Physics 2023, no. 11 (2023): 009. http://dx.doi.org/10.1088/1475-7516/2023/11/009.

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Abstract Oscillating scalar field condensates induce small amplitude oscillations of the Hubble parameter which can induce a decay of the condensate due to a parametric resonance instability [1]. We show that this instability can lead to the decay of the coherence of the condensate of axion-like particle (ALP) fields during the radiation phase of standard cosmology for rather generic ALP parameter values, with possible implications for certain experiments aiming to search for ALP candidates. As an example, we study the application of this instability to the QCD axion. We also study the magnitu

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41

Azcoiti, Vicente. "Topology in the SU(Nf) chiral symmetry restored phase of unquenched QCD and axion cosmology." EPJ Web of Conferences 175 (2018): 04007. http://dx.doi.org/10.1051/epjconf/201817504007.

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The axion is one of the more interesting candidates to make the dark matter of the universe, and the axion potential plays a fundamental role in the determination of the dynamics of the axion field. Moreover, the way in which the U(1)A anomaly manifests itself in the chiral symmetry restored phase of QCD at high temperature could be tested when probing the QCD phase transition in relativistic heavy ion collisions. With these motivations, we investigate the physical consequences of the survival of the effects of the U(1)A anomaly in the chiral symmetric phase of QCD, and show that the free ener

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42

Choi, Kiwoon, Hang Bae Kim, and Jihn E. Kim. "Axion cosmology with a stronger QCD in the early universe." Nuclear Physics B 490, no. 1-2 (1997): 349–64. http://dx.doi.org/10.1016/s0550-3213(97)00066-7.

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43

Davidson, Sacha, and Martin Elmer. "Bose-Einstein condensation of the classical axion field in cosmology?" Journal of Cosmology and Astroparticle Physics 2013, no. 12 (2013): 034. http://dx.doi.org/10.1088/1475-7516/2013/12/034.

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44

Barr, S. M., Kiwoon Choi, and Jihn E. Kim. "Some aspects of axion cosmology in unified and superstring models." Nuclear Physics B 283 (January 1987): 591–604. http://dx.doi.org/10.1016/0550-3213(87)90288-4.

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45

Petreczky, Peter, Hans-Peter Schadler, and Sayantan Sharma. "The topological susceptibility in finite temperature QCD and axion cosmology." Physics Letters B 762 (November 2016): 498–505. http://dx.doi.org/10.1016/j.physletb.2016.09.063.

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46

Riechers, Dominik A., Axel Weiss, Fabian Walter, et al. "Water Silhouettes against the Cosmic Microwave Background from the Most Distant Starburst Galaxies." EPJ Web of Conferences 265 (2022): 00044. http://dx.doi.org/10.1051/epjconf/202226500044.

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Astrophysical objects can imprint distortions on the observed Cosmic Microwave Background (CMB) that give access to information for cosmology research that cannot be obtained otherwise. ΛCDM cosmology implies a linear scaling of the CMB temperature (TCMB) with redshift z, but departures of this linear scaling behavior are allowed in more complex, but currently poorly observationally constrained cosmological models, such as those that include an evolution of physical constants, decaying dark energy, or axion-photon-like coupling processes. We here introduce a new method to directly measure TCMB

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47

Rogers, Keir K., Renée Hložek, Alex Laguë, et al. "Ultra-light axions and the S ₈ tension: joint constraints from the cosmic microwave background and galaxy clustering." Journal of Cosmology and Astroparticle Physics 2023, no. 06 (2023): 023. http://dx.doi.org/10.1088/1475-7516/2023/06/023.

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Abstract We search for ultra-light axions as dark matter (DM) and dark energy particle candidates, for axion masses 10-32 eV ≤ m a ≤ 10-24 eV, by a joint analysis of cosmic microwave background (CMB) and galaxy clustering data — and consider if axions can resolve the tension in inferred values of the matter clustering parameter S 8. We give legacy constraints from Planck 2018 CMB data, improving 2015 limits on the axion density Ωa h 2 by up to a factor of three; CMB data from the Atacama Cosmology Telescope and the South Pole Telescope marginally weaken Planck bounds at m a = 10-25 eV, owing t

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48

Green, Daniel, Yi Guo, and Benjamin Wallisch. "Cosmological implications of axion-matter couplings." Journal of Cosmology and Astroparticle Physics 2022, no. 02 (2022): 019. http://dx.doi.org/10.1088/1475-7516/2022/02/019.

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Abstract Axions and other light particles appear ubiquitously in physics beyond the Standard Model, with a variety of possible couplings to ordinary matter. Cosmology offers a unique probe of these particles as they can thermalize in the hot environment of the early universe for any such coupling. For sub-MeV particles, their entropy must leave a measurable cosmological signal, usually via the effective number of relativistic particles, N eff. In this paper, we will revisit the cosmological constraints on the couplings of axions and other pseudo-Nambu-Goldstone bosons to Standard Model fermion

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49

Maldonado, Carlos, and Fernando Méndez. "Axionic Dark Matter in a Bi-Metric Universe." Universe 9, no. 10 (2023): 429. http://dx.doi.org/10.3390/universe9100429.

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We study the evolution and production of axion dark matter in a universe model with two scale factors corresponding to different patches of the universe. The interaction between patches is described through a deformed Poisson bracket structure. The first part of the present paper is devoted to a review of the results reported in previous works concerning the study of dark matter as WIMPs and FIMPs. The new results concerning axionic dark matter in this bi-metric scenario show that different values of the deformation parameter κ allow values of masses and misalignment angles forbidden in standa

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Ramadan, Omar F., Jeremy Sakstein, and Djuna Croon. "Cosmology and astrophysics of CP-violating axions." Journal of Cosmology and Astroparticle Physics 2025, no. 05 (2025): 056. https://doi.org/10.1088/1475-7516/2025/05/056.

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Abstract We study the cosmology and astrophysics of axion-like particles (ALPs) with CP-violating Yukawa couplings to nucleons. At finite nucleon density, the ALP's dynamics is governed by an effective potential which is the sum of the bare periodic potential and a linear potential whose strength depends on the nucleon density. We identify a critical nucleon density ρc controlling the dynamics. At densities smaller than ρc the effective potential is a tilted sinusoidal curve and the field is displaced from its zero-density minimum. At densities larger than ρc the minima (and maxima) are absent

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