Article
Astronomy & Astrophysics
Alessandro Greco, Nicola Bartolo, Alessandro Gruppuso
Summary: This paper presents a tomographic treatment of anisotropic cosmic birefringence (ACB) caused by the coupling between an axion-like field and the electromagnetic sector. By considering photons emitted at different epochs, the study reveals that the anisotropic component of cosmic birefringence is enhanced with increasing axion mass, allowing for a wider range of mass exploration compared to the isotropic case. The interplay between reionization and recombination contributions to ACB at large angular scales is found to be sensitive to the axion mass, making the tomographic approach a promising tool for investigating the properties of this axion-like field.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Ke Wang, Lu Chen
Summary: In this paper, a consistency test of the fine-structure constant from the whole ionization history is conducted by considering both the recombination epoch and the reionization epoch. The results show a significant inconsistency between the fine-structure constant during these two epochs, suggesting potential issues with the data used.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Noriaki Kitazawa
Summary: This article investigates the dependence of the ratio of cosmic microwave background (CMB) polarization power spectra on the process of reionization. The results indicate that the ratio is not very sensitive to the reionization process at low redshifts but sensitive to the value of optical depth. However, at l = 2, the ratio is almost unaffected by the reionization process and is approximately half of the value of the tensor-to-scalar ratio.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Francesco Capozzi, Ricardo Z. Ferreira, Laura Lopez-Honorez, Olga Mena
Summary: Dark matter energy injection in the early universe affects ionization and temperature of intergalactic medium. This study improves the CMB bounds on sub-keV dark matter and extends previous bounds from Lyman-α observations, resulting in new and competitive constraints on axion-like particles (ALPs) decaying into two photons. The limits depend on the reionization history, accounted for consistently by modifying publicly available DarkHistory and CLASS codes. Future measurements, such as from the CMB-S4 experiment, may have a crucial role in searching for this type of light dark matter candidates.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Sayan Saha, Shabbir Shaikh, Suvodip Mukherjee, Tarun Souradeep, Benjamin D. Wandelt
Summary: The study reveals that the local motion amplitude and direction can be inferred from the CMB dipole signal, consistent with the canonical value previously determined. However, it strongly disagrees with the conclusion of a higher local motion inferred from the CatWISE2020 quasar catalog data set.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Wenzhong Liu, Luis A. Anchordoqui, Eleonora Di Valentino, Supriya Pan, Yabo Wu, Weiqiang Yang
Summary: In recent cosmological observations, discrepancies have been found in the rate of expansion of the universe and the clustering of matter. A novel model proposes that cold dark matter disintegrates into dark radiation. However, this model fails to solve the discrepancy in the rate of expansion, although it can address the clustering issue under certain conditions. The effectiveness of these models is weakened when intermediate-redshift data is included.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Shek Yeung, King Lau, M-C Chu
Summary: This study investigates the impact of a finite relic neutrino degeneracy on the CMB angular power spectra and its correlations with other cosmological parameters. The results suggest that the relic neutrino degeneracy is a significant physical parameter for cosmological analyses, potentially loosening constraints on inflation models and slightly alleviating tensions in measurements.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
James Creswell, Pavel Naselsky
Summary: By using a pixel domain approach, we investigated the sources of parity asymmetry in the CMB temperature maps and found that they are mainly related to the presence of two pairs of high asymmetry regions. The asymmetric peaks in the Galactic plane and the Northern Galactic Spur lead to an increase in odd-multipole power, while the deficit of symmetric peaks is associated with a deficit in the even-multipole power, resulting in parity asymmetry of the CMB temperature maps.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Arefe Abghari, Raelyn M. Sullivan, Lukas T. Hergt, Douglas Scott
Summary: This paper investigates a method for exploring a birefringent universe through the rotation of the plane of polarization of cosmic microwave background photons. The authors propose an independent method for extracting the birefringence angle using only temperature and E-mode signals. They forecast that with an ideal experiment, a birefringence angle of 0.3 degrees can be constrained with 3 sigma statistical significance. Additionally, the authors explore the impact of systematic errors introduced by polarization efficiency and suggest this method as an additional way to verify claimed birefringence signatures derived from B modes.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Rajorshi Sushovan Chandra, Tarun Souradeep
Summary: The study uses an improved deconvolution algorithm to reconstruct the Primordial Power Spectrum from Weak Lensing Power Spectrum, providing an independent method to observe and constrain the spectrum. The Weak Lensing Power Spectrum is cleaner and provides unique features over different K scales compared to the CMB Temperature Power Spectrum.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Lu Chen, Ke Wang
Summary: This study investigates the impact of different reionization models on constraining parameters of dark matter annihilation, finding that various reionization models have little influence (less than or similar to 2.5%) on the constraints of dark matter decay or annihilation.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Gabriele Montefalcone, Maximilian H. Abitbol, Darsh Kodwani, R. D. P. Grumitt
Summary: This study introduces a novel application of partial convolutional neural networks (PCNN) for inpainting masked images of the cosmic microwave background, achieving map and power spectra reconstruction accuracy to a few percent with circular and irregularly shaped masks covering up to 10% of the image area. Kolmogorov-Smirnov tests demonstrate the indistinguishability of the reconstructed maps and power spectra from the input data at a 99.9% confidence level, highlighting the potential of PCNNs as an important tool in cosmological data analysis.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Shamik Ghosh, Rahul Kothari, Pankaj Jain, Ashok K. Singal
Summary: This paper presents an independent method for extracting the birefringence angle using only temperature and E-mode signals, offering a potential alternative to the conventional polarisation B modes approach.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Benjamin Beringue, P. Daniel Meerburg, Joel Meyers, Nicholas Battaglia
Summary: The cosmic microwave background (CMB) is a valuable resource for cosmology. Measuring Rayleigh scattering signal can significantly enhance the constraint on cosmological parameters.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
S. Azzoni, M. H. Abitbol, D. Alonso, A. Gough, N. Katayama, T. Matsumura
Summary: Characterizing and modeling of polarized foregrounds is crucial for searching for primordial B-modes, often done by parametrizing and factorizing the spectral properties of foregrounds, which can introduce inaccuracies leading to biases in cosmological parameter estimation, especially in surveys covering large areas of the sky.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)