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Journal articles on the topic 'LiteBIRD'

Author: Grafiati

Published: 12 October 2024

Last updated: 31 July 2025

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1

Remazeilles, M., M. Douspis, J. A. Rubiño-Martín, et al. "LiteBIRD science goals and forecasts. Mapping the hot gas in the Universe." Journal of Cosmology and Astroparticle Physics 2024, no. 12 (2024): 026. https://doi.org/10.1088/1475-7516/2024/12/026.

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Abstract We assess the capabilities of the LiteBIRD mission to map the hot gas distribution in the Universe through the thermal Sunyaev-Zeldovich (SZ) effect. Our analysis relies on comprehensive simulations incorporating various sources of Galactic and extragalactic foreground emission, while accounting for the specific instrumental characteristics of the LiteBIRD mission, such as detector sensitivities, frequency-dependent beam convolution, inhomogeneous sky scanning, and 1/f noise. We implement a tailored component-separation pipeline to map the thermal SZ Compton y-parameter over 98% of th

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2

Ishino, Hirokazu. "LiteBIRD." International Journal of Modern Physics: Conference Series 43 (January 2016): 1660192. http://dx.doi.org/10.1142/s2010194516601927.

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We present LiteBIRD, a satellite project dedicated for the detection of the CMB B-mode polarization. The purpose of LiteBIRD is to measure the tensor-to-scalar ratio [Formula: see text] with a precision of [Formula: see text] to test large-single-field slow-roll inflation models by scanning all the sky area for three years at the sun-earth L2 with the sensitivity of 3.2[Formula: see text]K⋅arcmin. We report an overview and the status of the project, including the ongoing detector and systematic studies.

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Paoletti, D., J. A. Rubino-Martin, M. Shiraishi, et al. "LiteBIRD science goals and forecasts: primordial magnetic fields." Journal of Cosmology and Astroparticle Physics 2024, no. 07 (2024): 086. http://dx.doi.org/10.1088/1475-7516/2024/07/086.

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Abstract We present detailed forecasts for the constraints on the characteristics of primordial magnetic fields (PMFs) generated prior to recombination that will be obtained with the LiteBIRD satellite. The constraints are driven by some of the main physical effects of PMFs on the CMB anisotropies: the gravitational effects of magnetically-induced perturbations; the effects on the thermal and ionization history of the Universe; the Faraday rotation imprint on the CMB polarization spectra; and the non-Gaussianities induced in polarization anisotropies. LiteBIRD represents a sensitive probe for

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4

Namikawa, T., A. I. Lonappan, C. Baccigalupi, et al. "LiteBIRD science goals and forecasts: improving sensitivity to inflationary gravitational waves with multitracer delensing." Journal of Cosmology and Astroparticle Physics 2024, no. 06 (2024): 010. http://dx.doi.org/10.1088/1475-7516/2024/06/010.

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Abstract We estimate the efficiency of mitigating the lensing B-mode polarization, the so-called delensing, for the LiteBIRD experiment with multiple external data sets of lensing-mass tracers. The current best bound on the tensor-to-scalar ratio, r, is limited by lensing rather than Galactic foregrounds. Delensing will be a critical step to improve sensitivity to r as measurements of r become more and more limited by lensing. In this paper, we extend the analysis of the recent LiteBIRD forecast paper to include multiple mass tracers, i.e., the CMB lensing maps from LiteBIRD and CMB-S4-like ex

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5

Matsumura, T., Y. Akiba, J. Borrill, et al. "Mission Design of LiteBIRD." Journal of Low Temperature Physics 176, no. 5-6 (2014): 733–40. http://dx.doi.org/10.1007/s10909-013-0996-1.

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6

Campeti, P., E. Komatsu, C. Baccigalupi, et al. "LiteBIRD science goals and forecasts. A case study of the origin of primordial gravitational waves using large-scale CMB polarization." Journal of Cosmology and Astroparticle Physics 2024, no. 06 (2024): 008. http://dx.doi.org/10.1088/1475-7516/2024/06/008.

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Abstract We study the possibility of using the LiteBIRD satellite B-mode survey to constrain models of inflation producing specific features in CMB angular power spectra. We explore a particular model example, i.e. spectator axion-SU(2) gauge field inflation. This model can source parity-violating gravitational waves from the amplification of gauge field fluctuations driven by a pseudoscalar “axionlike” field, rolling for a few e-folds during inflation. The sourced gravitational waves can exceed the vacuum contribution at reionization bump scales by about an order of magnitude and can be compa

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7

Jinno, Ryusuke, Kazunori Kohri, Takeo Moroi, Tomo Takahashi, and Masashi Hazumi. "Testing multi-field inflation with LiteBIRD." Journal of Cosmology and Astroparticle Physics 2024, no. 03 (2024): 011. http://dx.doi.org/10.1088/1475-7516/2024/03/011.

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Abstract We investigate expected constraints on the primordial tensor power spectrum from the future cosmic microwave background polarization experiment LiteBIRD as a test of multi-field inflation, where we specifically consider spectator models as representative examples. We argue that the measurements of the tensor-to-scalar ratio and the tensor spectral index, in combination with the constraints on the scalar spectral index from the Planck observation, are useful in testing multi-field inflation models. We also discuss implications for multi-field inflationary model building.

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8

Lonappan, A. I., T. Namikawa, G. Piccirilli, et al. "LiteBIRD science goals and forecasts: a full-sky measurement of gravitational lensing of the CMB." Journal of Cosmology and Astroparticle Physics 2024, no. 06 (2024): 009. http://dx.doi.org/10.1088/1475-7516/2024/06/009.

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Abstract We explore the capability of measuring lensing signals in LiteBIRD full-sky polarization maps. With a 30 arcmin beam width and an impressively low polarization noise of 2.16 μK-arcmin, LiteBIRD will be able to measure the full-sky polarization of the cosmic microwave background (CMB) very precisely. This unique sensitivity also enables the reconstruction of a nearly full-sky lensing map using only polarization data, even considering its limited capability to capture small-scale CMB anisotropies. In this paper, we investigate the ability to construct a full-sky lensing measurement in t

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9

dos Santos, F. B. M., G. Rodrigues, R. de Souza, and J. S. Alcaniz. "Stage IV CMB forecasts for warm inflation." Journal of Cosmology and Astroparticle Physics 2025, no. 03 (2025): 062. https://doi.org/10.1088/1475-7516/2025/03/062.

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Abstract We report forecast constraints on warm inflation in the light of future cosmic microwave background (CMB) surveys, with data expected to be available in the coming decade. These observations could finally give us the missing information necessary to unveil the production of gravitational waves during inflation, reflected by the detection of a non-zero tensor-to-scalar ratio crucial to the B-mode power spectrum of the CMB. We consider the impact of three future surveys, namely the CMB-S4, Simons Observatory, and the space-borne LiteBIRD, in restricting the parameter space of four typic

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10

Remazeilles, Mathieu, Andrea Ravenni та Jens Chluba. "Leverage on small-scale primordial non-Gaussianity through cross-correlations between CMB E-mode and μ-distortion anisotropies". Monthly Notices of the Royal Astronomical Society 512, № 1 (2022): 455–70. http://dx.doi.org/10.1093/mnras/stac519.

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ABSTRACT Multifield inflation models and non-Bunch–Davies vacuum initial conditions both predict sizeable non-Gaussian primordial perturbations and anisotropic μ-type spectral distortions of the cosmic microwave background (CMB) blackbody. While CMB anisotropies allow us to probe non-Gaussianity at wavenumbers $k\simeq 0.05\, {\rm Mpc^{-1}}$, μ-distortion anisotropies are related to non-Gaussianity of primordial perturbation modes with much larger wavenumbers, $k\simeq 740\, {\rm Mpc^{-1}}$. Through cross-correlations between CMB and μ-distortion anisotropies, one can therefore shed light on t

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11

Matsumura, T., Y. Akiba, K. Arnold, et al. "LiteBIRD: Mission Overview and Focal Plane Layout." Journal of Low Temperature Physics 184, no. 3-4 (2016): 824–31. http://dx.doi.org/10.1007/s10909-016-1542-8.

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12

Suzuki, A., P. A. R. Ade, Y. Akiba, et al. "The LiteBIRD Satellite Mission: Sub-Kelvin Instrument." Journal of Low Temperature Physics 193, no. 5-6 (2018): 1048–56. http://dx.doi.org/10.1007/s10909-018-1947-7.

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13

Drewes, Marco, Lei Ming, and Isabel Oldengott. "LiteBIRD and CMB-S4 sensitivities to reheating in plateau models of inflation." Journal of Cosmology and Astroparticle Physics 2024, no. 05 (2024): 081. http://dx.doi.org/10.1088/1475-7516/2024/05/081.

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Abstract We study the sensitivity of LiteBIRD and CMB-S4 to the reheating temperature and the inflaton coupling in three types of plateau-potential models of inflation, namely mutated hilltop inflation, radion gauge inflation, and α-attractor T models. We first find relations between model parameters and CMB observables in all models. We then perform Monte Carlo Markov Chain based forecasts to quantify the information gain on the reheating temperature, the inflaton coupling, and the scale of inflation that can be achieved with LiteBIRD and CMB-S4, assuming a fiducial tensor-to-scalar ratio r̅

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14

Giardiello, S., M. Gerbino, L. Pagano, et al. "Detailed study of HWP non-idealities and their impact on future measurements of CMB polarization anisotropies from space." Astronomy & Astrophysics 658 (January 25, 2022): A15. http://dx.doi.org/10.1051/0004-6361/202141619.

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We study the propagation of a specific class of instrumental systematics to the reconstruction of the B-mode power spectrum of the cosmic microwave background (CMB). We focus on the non-idealities of the half-wave plate (HWP), a polarization modulator that is to be deployed by future CMB experiments, such as the phase-A satellite mission LiteBIRD. We study the effects of non-ideal HWP properties, such as transmittance, phase shift, and cross-polarization. To this end, we developed a simple, yet stand-alone end-to-end simulation pipeline adapted to LiteBIRD. We analyzed the effects of a possibl

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15

Carralot, F., A. Carones, N. Krachmalnicoff, et al. "Requirements on the gain calibration for LiteBIRD polarisation data with blind component separation." Journal of Cosmology and Astroparticle Physics 2025, no. 01 (2025): 019. https://doi.org/10.1088/1475-7516/2025/01/019.

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Abstract The detection of primordial B modes of the cosmic microwave background (CMB) could provide information about the early stages of the Universe's evolution. The faintness of this signal requires exquisite calibration accuracy and control of instrumental systematic effects which otherwise could bias the measurements. In this work, we study the impact of an imperfect relative polarisation gain calibration on the recovered value of the tensor-to-scalar ratio r for the LiteBIRD experiment, through the application of the blind Needlet Internal Linear Combination (NILC) foreground-cleaning me

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16

Takase, Y., L. Vacher, H. Ishino, et al. "Multi-dimensional optimisation of the scanning strategy for the LiteBIRD space mission." Journal of Cosmology and Astroparticle Physics 2024, no. 12 (2024): 036. https://doi.org/10.1088/1475-7516/2024/12/036.

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Abstract Large angular scale surveys in the absence of atmosphere are essential for measuring the primordial B-mode power spectrum of the Cosmic Microwave Background (CMB). Since this proposed measurement is about three to four orders of magnitude fainter than the temperature anisotropies of the CMB, in-flight calibration of the instruments and active suppression of systematic effects are crucial. We investigate the effect of changing the parameters of the scanning strategy on the in-flight calibration effectiveness, the suppression of the systematic effects themselves, and the ability to dist

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17

Grumitt, R. D. P., Luke R. P. Jew, and C. Dickinson. "Hierarchical Bayesian CMB component separation with the No-U-Turn Sampler." Monthly Notices of the Royal Astronomical Society 496, no. 4 (2020): 4383–401. http://dx.doi.org/10.1093/mnras/staa1857.

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ABSTRACT In this paper, we present a novel implementation of Bayesian cosmic microwave background (CMB) component separation. We sample from the full posterior distribution using the No-U-Turn Sampler (NUTS), a gradient-based sampling algorithm. Alongside this, we introduce new foreground modelling approaches. We use the mean shift algorithm to define regions on the sky, clustering according to naively estimated foreground spectral parameters. Over these regions we adopt a complete pooling model, where we assume constant spectral parameters, and a hierarchical model, where we model individual

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18

Krachmalnicoff, N., T. Matsumura, E. de la Hoz, et al. "In-flight polarization angle calibration for LiteBIRD: blind challenge and cosmological implications." Journal of Cosmology and Astroparticle Physics 2022, no. 01 (2022): 039. http://dx.doi.org/10.1088/1475-7516/2022/01/039.

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Abstract We present a demonstration of the in-flight polarization angle calibration for the JAXA/ISAS second strategic large class mission, LiteBIRD, and estimate its impact on the measurement of the tensor-to-scalar ratio parameter, r, using simulated data. We generate a set of simulated sky maps with CMB and polarized foreground emission, and inject instrumental noise and polarization angle offsets to the 22 (partially overlapping) LiteBIRD frequency channels. Our in-flight angle calibration relies on nulling the EB cross correlation of the polarized signal in each channel. This calibration

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19

Sugai, H., P. A. R. Ade, Y. Akiba, et al. "Updated Design of the CMB Polarization Experiment Satellite LiteBIRD." Journal of Low Temperature Physics 199, no. 3-4 (2020): 1107–17. http://dx.doi.org/10.1007/s10909-019-02329-w.

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20

Jaehnig, G. C., K. Arnold, J. Austermann, et al. "Development of Space-Optimized TES Bolometer Arrays for LiteBIRD." Journal of Low Temperature Physics 199, no. 3-4 (2020): 646–53. http://dx.doi.org/10.1007/s10909-020-02425-2.

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21

Hattori, K., S. Ariyoshi, M. Hazumi, et al. "Novel Frequency-Domain Multiplexing MKID Readout for the LiteBIRD Satellite." Journal of Low Temperature Physics 167, no. 5-6 (2012): 671–77. http://dx.doi.org/10.1007/s10909-012-0506-x.

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22

Hasebe, Takashi, Yutaro Sekimoto, Tadayasu Dotani, Kazuhisa Mitsuda, Keisuke Shinozaki, and Seiji Yoshida. "Optimization of cryogenic architecture for LiteBIRD satellite using radiative cooling." Journal of Astronomical Telescopes, Instruments, and Systems 5, no. 04 (2019): 1. http://dx.doi.org/10.1117/1.jatis.5.4.044002.

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23

Shi, Rui, Tobias A. Marriage, John W. Appel, et al. "Testing Cosmic Microwave Background Anomalies in E-mode Polarization with Current and Future Data." Astrophysical Journal 945, no. 1 (2023): 79. http://dx.doi.org/10.3847/1538-4357/acb339.

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Abstract In this paper, we explore the power of the cosmic microwave background (CMB) polarization (E-mode) data to corroborate four potential anomalies in CMB temperature data: the lack of large angular-scale correlations, the alignment of the quadrupole and octupole (Q–O), the point-parity asymmetry, and the hemispherical power asymmetry. We use CMB simulations with noise representative of three experiments—the Planck satellite, the Cosmology Large Angular Scale Surveyor (CLASS), and the LiteBIRD satellite—to test how current and future data constrain the anomalies. We find the correlation c

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Researcher. "DETECTING THE IMPRINT OF PRIMORDIAL GRAVITATIONAL WAVES ON THE COSMIC MICROWAVE BACKGROUND POLARIZATION PATTERNS USING NEXT-GENERATION OBSERVATORIES." International Journal of Astronomy and Astrophysics (IJAA) 3, no. 1 (2025): 1–5. https://doi.org/10.5281/zenodo.14698472.

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The detection of primordial gravitational waves (PGWs) is a pivotal goal in modern cosmology, providing direct evidence for inflationary theory. Their faint imprints on the polarization patterns of the Cosmic Microwave Background (CMB) radiation, specifically in the B-mode polarization, hold the key. Next-generation observatories such as CMB-S4 and LiteBIRD promise unprecedented sensitivity to these signals. This paper discusses theoretical and observational progress, reviews recent advancements, and explores methodologies for analyzing PGW imprints on CMB polarization patterns.

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Hasebe, T., S. Kashima, P. A. R. Ade, et al. "Concept Study of Optical Configurations for High-Frequency Telescope for LiteBIRD." Journal of Low Temperature Physics 193, no. 5-6 (2018): 841–50. http://dx.doi.org/10.1007/s10909-018-1915-2.

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26

Duval, Jean-Marc, Thomas Prouvé, Peter Shirron, et al. "LiteBIRD Cryogenic Chain: 100 mK Cooling with Mechanical Coolers and ADRs." Journal of Low Temperature Physics 199, no. 3-4 (2020): 730–36. http://dx.doi.org/10.1007/s10909-020-02371-z.

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27

Hattori, K., M. Hazumi, H. Ishino, et al. "Development of microwave kinetic inductance detectors and their readout system for LiteBIRD." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 732 (December 2013): 306–10. http://dx.doi.org/10.1016/j.nima.2013.08.019.

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28

Carones, Alessandro, Marina Migliaccio, Giuseppe Puglisi, et al. "Multiclustering needlet ILC for CMB B-mode component separation." Monthly Notices of the Royal Astronomical Society 525, no. 2 (2023): 3117–35. http://dx.doi.org/10.1093/mnras/stad2423.

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ABSTRACT The Cosmic Microwave Background (CMB) primordial B-mode signal is predicted to be much lower than the polarized Galactic emission (foregrounds) in any region of the sky pointing to the need for sophisticated component separation methods. Among them, the blind Needlet Internal Linear Combination (NILC) has great relevance given our current poor knowledge of the B-mode foregrounds. However, the expected level of spatial variability of the foreground spectral properties complicates the NILC subtraction of the Galactic contamination. We therefore propose a novel extension of the NILC appr

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29

Vielva, P., E. Martínez-González, F. J. Casas, et al. "Polarization angle requirements for CMB B-mode experiments. Application to the LiteBIRD satellite." Journal of Cosmology and Astroparticle Physics 2022, no. 04 (2022): 029. http://dx.doi.org/10.1088/1475-7516/2022/04/029.

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Abstract A methodology to provide the polarization angle requirements for different sets of detectors, at a given frequency of a CMB polarization experiment, is presented. The uncertainties in the polarization angle of each detector set are related to a given bias on the tensor-to-scalar ratio r parameter. The approach is grounded in using a linear combination of the detector sets to obtain the CMB polarization signal. In addition, assuming that the uncertainties on the polarization angle are in the small angle limit (lower than a few degrees), it is possible to derive analytic expressions to

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Petretti, Catherine, Matteo Braglia, Xingang Chen, Dhiraj Kumar Hazra, and Sonia Paban. "Investigating the origin of CMB large-scale features using LiteBIRD and CMB-S4." Journal of Cosmology and Astroparticle Physics 2025, no. 06 (2025): 035. https://doi.org/10.1088/1475-7516/2025/06/035.

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Abstract Several missions following Planck are currently under development, which will provide high-precision measurements of the Cosmic Microwave Background (CMB) anisotropies. Specifically, measurements of the E modes will become nearly limited by cosmic variance, which, especially when considering the sharpness of the E-mode transfer functions, may allow for the ability to detect deviations from the concordance model in the CMB data. We investigate the capability of upcoming missions to scrutinize models that have been proposed to address large-scale anomalies observed in the temperature sp

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Dimastrogiovanni, Emanuela, Matteo Fasiello, and A. Emir Gümrükçüoğlu. "Spinning guest fields during inflation: leftover signatures." Journal of Cosmology and Astroparticle Physics 2021, no. 11 (2021): 047. http://dx.doi.org/10.1088/1475-7516/2021/11/047.

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Abstract We consider the possibility of extra spinning particles during inflation, focussing on the spin-2 case. Our analysis relies on the well-known fully non-linear formulation of interacting spin-2 theories. We explore the parameter space of the corresponding inflationary Lagrangian and identify regions therein exhibiting signatures within reach of upcoming CMB probes. We provide a thorough study of the early and late-time dynamics ensuring that stability conditions are met throughout the cosmic evolution. We characterise in particular the gravitational wave spectrum and three-point functi

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32

Kallosh, Renata, та Andrei Linde. "SL(2,ℤ) cosmological attractors". Journal of Cosmology and Astroparticle Physics 2025, № 04 (2025): 045. https://doi.org/10.1088/1475-7516/2025/04/045.

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Abstract We study cosmological theory where the kinetic term and potential have SL(2,ℤ) symmetry. Potentials have a plateau at large values of the inflaton field, where the axion forms a flat direction. Due to the underlying hyperbolic geometry and special features of SL(2,ℤ) potentials, the theory exhibits an α-attractor behavior: its cosmological predictions are stable with respect to significant modifications of the SL(2,ℤ) invariant potentials. We present a supersymmetric version of this theory in the framework of D3 induced geometric inflation. The choice of α is determined by underlying

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33

Takakura, Hayato, Yutaro Sekimoto, Junji Inatani, et al. "Far-Sidelobe Antenna Pattern Measurement of LiteBIRD Low Frequency Telescope in 1/4 Scale." IEEE Transactions on Terahertz Science and Technology 9, no. 6 (2019): 598–605. http://dx.doi.org/10.1109/tthz.2019.2937497.

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34

Leloup, C., G. Patanchon, J. Errard, et al. "Impact of beam far side-lobe knowledge in the presence of foregrounds for LiteBIRD." Journal of Cosmology and Astroparticle Physics 2024, no. 06 (2024): 011. http://dx.doi.org/10.1088/1475-7516/2024/06/011.

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Abstract We present a study of the impact of a beam far side-lobe lack of knowledge on the measurement of the Cosmic Microwave Background B-mode signal at large scale. Beam far side-lobes induce a mismatch in the transfer function of Galactic foregrounds between the dipole and higher multipoles which degrads the performances of component separation methods. This leads to foreground residuals in the CMB map. It is expected to be one of the main source of systematic effects in future CMB polarization observations. Thus, it becomes crucial for all-sky survey missions to take into account the inte

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35

Ritacco, A., R. Adam, P. Ade, et al. "Crab nebula at 260 GHz with the NIKA2 polarimeter: Implications for the polarization angle calibration of future CMB experiments." EPJ Web of Conferences 257 (2022): 00042. http://dx.doi.org/10.1051/epjconf/202225700042.

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The quest for primordial gravitational waves enclosed in the Cosmic Microwave Background (CMB) polarization B-modes signal motivates the development of a new generation of high sensitive experiments (e.g. CMBS4, LiteBIRD), thus allowing to probe the inflationary epoch in the early Universe. However, this will be only possible by ensuring a high control of the instrumental systematic effects and an accurate absolute calibration of the polarization angle. The Crab nebula is known to be a polarization calibrator on the sky for CMB experiments. Already used for the Planck satellite it exhibits a h

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Väliviita, Jussi. "Power spectra based Planck constraints on compensated isocurvature, and forecasts for LiteBIRD and CORE space missions." Journal of Cosmology and Astroparticle Physics 2017, no. 04 (2017): 014. http://dx.doi.org/10.1088/1475-7516/2017/04/014.

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37

Hamann, Jan, and Ameek Malhotra. "Constraining primordial tensor features with the anisotropies of the cosmic microwave background." Journal of Cosmology and Astroparticle Physics 2022, no. 12 (2022): 015. http://dx.doi.org/10.1088/1475-7516/2022/12/015.

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Abstract It is commonly assumed that the stochastic background of gravitational waves on cosmological scales follows an almost scale-independent power spectrum, as generically predicted by the inflationary paradigm. However, it is not inconceivable that the spectrum could have strongly scale-dependent features, generated, e.g., via transient dynamics of spectator axion-gauge fields during inflation. Using the temperature and polarisation maps from the Planck and BICEP/Keck datasets, we search for such features, taking the example of a log-normal bump in the primordial tensor spectrum at CMB sc

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38

Hazumi, M., P. A. R. Ade, Y. Akiba, et al. "LiteBIRD: A Satellite for the Studies of B-Mode Polarization and Inflation from Cosmic Background Radiation Detection." Journal of Low Temperature Physics 194, no. 5-6 (2019): 443–52. http://dx.doi.org/10.1007/s10909-019-02150-5.

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39

Moursy, Ahmad, and Qaisar Shafi. "Primordial monopoles, black holes and gravitational waves." Journal of Cosmology and Astroparticle Physics 2024, no. 08 (2024): 064. http://dx.doi.org/10.1088/1475-7516/2024/08/064.

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Abstract We show how topologically stable superheavy magnetic monopoles and primordial black holes can be generated at observable levels by the waterfall field in hybrid inflation models based on grand unified theories. In SU(5) ×U(1) χ grand unification, the monopole mass is of order 4 × 1017 GeV, and it carries a single unit (2 π /e) of Dirac magnetic charge as well as screened color magnetic charge. The monopole density is partially diluted to an observable value, and accompanied with the production of primordial black holes with mass of order 1017–1019 g which may make up the entire dark m

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Raffuzzi, N., M. Lembo, S. Giardiello, et al. "Unveiling V modes: enhancing CMB sensitivity to BSM physics with a non-ideal half-wave plate." Journal of Cosmology and Astroparticle Physics 2025, no. 03 (2025): 009. https://doi.org/10.1088/1475-7516/2025/03/009.

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Abstract V-mode polarization of the cosmic microwave background is expected to be vanishingly small in the ΛCDM model and, hence, usually ignored. Nonetheless, several astrophysical effects, as well as beyond standard model physics could produce it at a detectable level. A realistic half-wave plate — an optical element commonly used in CMB experiments to modulate the polarized signal — can provide sensitivity to V modes without significantly spoiling that to linear polarization. We assess this sensitivity for some new-generation CMB experiments, such as the LiteBIRD satellite, the ground-based

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Hirota, Y., H. Ohsaki, Y. Terao, et al. "Evaluation of loss characteristics of superconducting magnetic bearings for LiteBIRD satellite by three-dimensional finite element method analysis." Journal of Physics: Conference Series 1293 (September 2019): 012086. http://dx.doi.org/10.1088/1742-6596/1293/1/012086.

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Akama, Shingo, Giorgio Orlando, and Paola C. M. Delgado. "Towards testing the general bounce cosmology with the CMB B-mode auto-bispectrum." Journal of Cosmology and Astroparticle Physics 2024, no. 09 (2024): 055. http://dx.doi.org/10.1088/1475-7516/2024/09/055.

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Abstract It has been shown that a three-point correlation function of tensor perturbations from a bounce model in general relativity with a minimally-coupled scalar field is highly suppressed, and the resultant three-point function of cosmic microwave background (CMB) B-mode polarizations is too small to be detected by CMB experiments. On the other hand, bounce models in a more general class with a non-minimal derivative coupling between a scalar field and gravity can predict the three-point correlation function of the tensor perturbations without any suppression, the amplitude of which is all

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Kubota, Kei-ichiro, Hiroki Matsui та Takahiro Terada. "Inflationary α-attractor models with singular derivative of potential". Journal of Cosmology and Astroparticle Physics 2023, № 07 (2023): 011. http://dx.doi.org/10.1088/1475-7516/2023/07/011.

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Abstract A generalization of inflationary α-attractor models (polynomial α-attractor) was recently proposed by Kallosh and Linde, in which the potential involves logarithmic functions of the inflaton so that the derivative of the potential but not potential itself has a singularity. We find that the models can lead to viable inflationary observables even without the pole in the kinetic term. Also, the generalization with a pole order other than two does not significantly change the functional form of the potential. This allows a systematic analysis of the predictions of this class of models. O

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Aoki, Mayumi, Jisuke Kubo, and Jinbo Yang. "Scale invariant extension of the Standard Model: a nightmare scenario in cosmology." Journal of Cosmology and Astroparticle Physics 2024, no. 05 (2024): 096. http://dx.doi.org/10.1088/1475-7516/2024/05/096.

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Abstract Inflationary observables of a classically scale invariant model, in which the origin of the Planck mass and the electroweak scale including the right-handed neutrino mass is chiral symmetry breaking in a QCD-like hidden sector, are studied. Despite a three-field inflation the initial-value-dependence is strongly suppressed thanks to a river-valley like potential. The model predicts the tensor-to-scalar ratio r of cosmological perturbations smaller than that of the R 2 inflation, i.e., 0.0044 ≳ r ≳ 0.0017 for e-foldings between 50 and 60: the model will be consistent even with a null d

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Zhou, Yuyang, Adrian Lee, and Yuji Chinone. "Map-based E/B separation of filtered timestreams using space-based E-mode observations." Journal of Cosmology and Astroparticle Physics 2025, no. 03 (2025): 048. https://doi.org/10.1088/1475-7516/2025/03/048.

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Abstract E to B mixing or "leakage" due to time-ordered data (TOD) filtering has become an important source of sensitivity loss that ground-based cosmic microwave background polarization experiments must address. However, it is a difficult problem for which very few viable solutions exist. In this paper, we expand upon satellite E-mode methods to cover E/B leakage specifically due to TOD filtering. We take a satellite E-mode map and TOD filter it through the ground-based experiment data analysis pipeline, from which we construct a map-space "leakage template" and subtract it from the ground-ba

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Lonappan, Anto Idicherian. "Improving cosmic birefringence constraints via delensing." Journal of Cosmology and Astroparticle Physics 2025, no. 07 (2025): 009. https://doi.org/10.1088/1475-7516/2025/07/009.

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Abstract We present a study on using delensing to enhance cosmic birefringence measurements based on full-sky, map-based simulations. In our analysis, we neglect foreground contamination and instrumental systematics to isolate the intrinsic impact of delensing on both isotropic and anisotropic birefringence. For the isotropic case, assuming a constant rotation angle of β = 0.35°, delensing reduces the lensing-induced variance in the EB power spectrum, yielding an improvement in sensitivity of approximately 10% at 6μK-arcmin noise for ℓ < 200 and 25–40% at lower noise levels for ℓ < 1000.

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Namikawa, Toshiya. "CMB mode coupling with isotropic polarization rotation." Monthly Notices of the Royal Astronomical Society 506, no. 1 (2021): 1250–57. http://dx.doi.org/10.1093/mnras/stab1796.

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ABSTRACT We provide a new analysis technique to measure the effect of the isotropic polarization rotation, induced by e.g. the isotropic cosmic birefringence from axion-like particles and a miscalibration of cosmic microwave background (CMB) polarization angle, via mode coupling in the CMB. Several secondary effects such as gravitational lensing and CMB optical-depth anisotropies lead to mode coupling in observed CMB anisotropies, i.e. non-zero off-diagonal elements in the observed CMB covariance. To derive the mode coupling, however, we usually assume no parity violation in the observed CMB a

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Revin, Leonid S., Dmitry A. Pimanov, Alexander V. Chiginev, et al. "Measurements of dichroic bow-tie antenna arrays with integrated cold-electron bolometers using YBCO oscillators." Beilstein Journal of Nanotechnology 15 (January 4, 2024): 26–36. http://dx.doi.org/10.3762/bjnano.15.3.

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We consider properties of dichroic antenna arrays on a silicon substrate with integrated cold-electron bolometers to detect radiation at frequencies of 210 and 240 GHz. This frequency range is widely used in cosmic microwave background experiments in space, balloon, and ground-based missions such as BICEP Array, LSPE, LiteBIRD, QUBIC, Simons Observatory, and AliCPT. As a direct radiation detector, we use cold-electron bolometers, which have high sensitivity and a wide operating frequency range, as well as immunity to spurious cosmic rays. Their other advantages are the compact size of the orde

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Bayer, Adrian E., Yici Zhong, Zack Li, Joseph DeRose, Yu Feng, and Jia Liu. "The HalfDome multi-survey cosmological simulations: N-body simulations." Journal of Cosmology and Astroparticle Physics 2025, no. 05 (2025): 016. https://doi.org/10.1088/1475-7516/2025/05/016.

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Abstract Upcoming cosmological surveys have the potential to reach groundbreaking discoveries on multiple fronts, including the neutrino mass, dark energy, and inflation. Most of the key science goals require the joint analysis of datasets from multiple surveys to break parameter degeneracies and calibrate systematics. To realize such analyses, a large set of mock simulations that realistically model correlated observables is required. In this paper we present the N-body component of the HalfDome cosmological simulations, designed for the joint analysis of Stage-IV cosmological surveys, such a

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Lagache, G., M. Béthermin, L. Montier, P. Serra, and M. Tucci. "Impact of polarised extragalactic sources on the measurement of CMB B-mode anisotropies." Astronomy & Astrophysics 642 (October 2020): A232. http://dx.doi.org/10.1051/0004-6361/201937147.

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One of the main goals of cosmology is to search for the imprint of primordial gravitational waves in the polarisation filed of the cosmic microwave background to probe inflation theories. One of the obstacles in detecting the primordial signal is that the cosmic microwave background B-mode polarisation must be extracted from among astrophysical contaminations. Most efforts have focus on limiting Galactic foreground residuals, but extragalactic foregrounds cannot be ignored at the large scale (ℓ ≲ 150), where the primordial B-modes are the brightest. We present a complete analysis of extragalac

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