Article
Astronomy & Astrophysics
Tirthankar Roy Choudhury, Suvodip Mukherjee, Sourabh Paul
Summary: By comparing predictions of a physical seminumerical model with CMB data, constraints on allowed reionization histories were studied, leading to the determination of tight constraints on parameters such as reionization duration and halo mass. Analysis showed implications for future CMB surveys and 21 cm studies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
L. Gelo, C. J. A. P. Martins, N. Quevedo, A. M. M. Vieira
Summary: The redshift dependence of the cosmic microwave background temperature has important implications for fundamental cosmology, and its constraining power is comparable to other background cosmology probes.
Article
Astronomy & Astrophysics
Peter Adshead, Niayesh Afshordi, Emanuela Dimastrogiovanni, Matteo Fasiello, Eugene A. Lim, Gianmassimo Tasinato
Summary: Characterizing the physical properties of the SGWB, focusing on anisotropies, can be an effective probe of early universe physics by cross correlating with the CMB. This can provide a smoking gun for primordial SGWB anisotropies.
Article
Astronomy & Astrophysics
Sandeep Kumar Acharya, Jiten Dhandha, Jens Chluba
Summary: The excess radio background observed at similar to 0.1-10GHz has sparked scientific debate in recent years. A recent hypothesis suggests that the soft photon emission from accreting primordial black holes could explain this signal. However, our study shows that the expected ultraviolet photon emission from these accreting black holes would fully ionize the universe at z > 6, thereby diminishing the 21-cm absorption signature at z similar to 20 and conflicting with the current limits of cosmic microwave background anisotropy and average spectral distortion.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Parth Nayak, Rajib Saha
Summary: This article introduces the application of the Genetic Algorithm (GA) to the reconstruction of CMB temperature anisotropy map, and verifies its reliability and flexibility through comparisons with other reconstruction methods.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
M-A Sanchis-Lozano, F. Melia, M. Lopez-Corredoira, N. Sanchis-Gual
Summary: Recent research has found that there is a maximum correlation angle in the two-point angular temperature correlations of cosmic microwave background (CMB) radiation, which contradicts the prediction of standard cosmology. The angular power spectrum of the CMB also shows a dominance of odd-over-even parity multipoles. This paper examines the relationship between these features and their impact on the theoretical fit to the Planck 2018 data. The results suggest that considering both the maximum correlation angle and the parity imbalance is crucial for optimizing the fit.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Frode K. Hansen, Ezequiel F. Boero, Heliana E. Luparello, Diego Garcia Lambas
Summary: A new cosmic microwave background (CMB) foreground has been discovered, which interacts with CMB photons around large spiral galaxies. This foreground can significantly impact the CMB fluctuation map and create CMB anomalies. By studying the temperature decrements around these galaxies, a foreground map model was created and found to have a strong correlation with the Planck CMB map. The existence of this foreground component suggests that the largest scales of the CMB may change, and a reliable corrected CMB map can only be achieved through further research and testing.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
E. Gjerlow, H. T. Ihle, S. Galeotta, K. J. Andersen, R. Aurlien, R. Banerji, M. Bersanelli, S. Bertocco, M. Brilenkov, M. Carbone, L. P. L. Colombo, H. K. Eriksen, M. K. Foss, C. Franceschet, U. Fuskeland, M. Galloway, S. Gerakakis, B. Hensley, D. Herman, M. Iacobellis, M. Ieronymaki, J. B. Jewell, A. Karakci, E. Keihaenen, R. Keskitalo, G. Maggio, D. Maino, M. Maris, S. Paradiso, B. Partridge, M. Reinecke, A. -s. Suur-Uski, T. L. Svalheim, D. Tavagnacco, H. Thommesen, D. J. Watts, I. K. Wehus, A. Zacchei
Summary: We propose a Bayesian calibration algorithm for CMB observations, applied to the Planck LFI data within the BEYONDPLANCK framework. The algorithm decomposes the gain into three components and uses Gibbs sampling to sample each term conditionally. The calibration results show good agreement with previous pipelines and improved inter-frequency consistency.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Sandeep Kumar Acharya, Jens Chluba
Summary: The Sunyaev-Zeldovich effect is a widely used probe for studying cosmology through the scattering of photons from the cosmic microwave background by hot cluster electron gas. This study investigates the scattering of other photon backgrounds, specifically the cosmic infrared background (CIB), in cluster medium. The analysis reveals an underestimation of the all-sky CIB distortion due to neglecting the intracluster scattering contribution, and suggests a redshift dependence in the single-cluster CIB scattering signal, which can be utilized in future cosmological studies with CMB experiments.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Tomohiro Fujita, Yuto Minami, Kai Murai, Hiromasa Nakatsuka
Summary: The study suggests that ALPs can rotate the linear polarization of photons and convert the cosmic microwave background E mode to the B mode through the ALP-photon coupling. By deriving the relationship between ALP dynamics and rotation angle, the current and future sensitivities of CMB observations to the ALP-photon coupling were calculated. Neglected fluctuations of the ALP field at the observer have been found to induce significant isotropic rotation of the CMB polarization.
Article
Astronomy & Astrophysics
Shikhar Mittal, Girish Kulkarni
Summary: In this study, we computed the isotropic radiation background from Hawking emission of primordial black holes (PBHs) and found that even under the extreme assumption that all dark matter is in the form of PBHs, the resulting radio brightness temperature is highly subdominant compared to the observed excess radio background. We also considered the alternative possibility of radio emission from gas accretion onto supermassive PBHs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Tianyue Chen, Mathieu Remazeilles
Summary: Residual foreground contamination by the thermal Sunyaev-Zeldovich effect affects the intrinsic cross-correlation between the cosmic microwave background (CMB) lensing and large-scale structure (LSS). Through analysis, we find that the contamination causes biases in the lensing convergence maps, validating earlier theoretical predictions. The results highlight the importance of deprojecting the tSZ effect from CMB maps and using tSZ-free CMB lensing maps for cross-correlations with LSS data.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Elia Stefano Battistelli, Valentina Capalbo, Giovanni Isopi, Federico Radiconi
Summary: The cosmic microwave background is a powerful tool for cosmology, and it could potentially provide evidence of the background of gravitational waves from the early universe. However, detecting this signal is challenging due to its weakness and the need to control systematic effects.
Article
Astronomy & Astrophysics
R. Aurich, D. Reinhardt
Summary: The study investigates the use of invariant scalar measures derived from first and second order covariant derivatives on the sphere to detect distortions in the observed CMB sky map caused by the aberration effect at high multipoles, providing an independent method for determining our peculiar velocity. The eigenvalues of the Hessian matrix of the temperature field are found to be well suited for this task.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Sandeep Kumar Acharya, Jens Chluba
Summary: The observed excess radio background has puzzled scientists for over a decade. A recent new physics solution involves the decay of dark matter into dark photons which then convert into standard photons in the reionization era. This simple power-law model fits the current data closely, although additional work is needed to address challenges and improve the model.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
C. A. P. Bengaly, A. Bernui, I. S. Ferreira, J. S. Alcaniz
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2017)
Article
Astronomy & Astrophysics
C. A. P. Bengaly, A. Bernui, J. S. Alcaniz, H. S. Xavier, C. P. Novaes
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2017)
Article
Astronomy & Astrophysics
G. A. Marques, C. P. Novaes, A. Bernui, I. S. Ferreira
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2018)
Article
Astronomy & Astrophysics
C. P. Novaes, A. Bernui, H. S. Xavier, G. A. Marques
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2018)
Article
Astronomy & Astrophysics
Felipe Avila, Camila P. Novaes, Armando Bernui, Edilson de Carvalho
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2018)
Article
Astronomy & Astrophysics
Gabriela A. Marques, Jia Liu, Jose Manuel Zorrilla Matilla, Zoltan Haiman, Armando Bernui, Camila P. Novaes
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2019)
Article
Astronomy & Astrophysics
F. Avila, C. P. Novaes, A. Bernui, E. de Carvalho, J. P. Nogueira-Cavalcante
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2019)
Article
Astronomy & Astrophysics
E. de Carvalho, A. Bernui, H. S. Xavier, C. P. Novaes
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Article
Astronomy & Astrophysics
G. C. Carvalho, A. Bernui, M. Benetti, J. C. Carvalho, E. de Carvalho, J. S. Alcaniz
ASTROPARTICLE PHYSICS
(2020)
Article
Astronomy & Astrophysics
Rafael C. Nunes, Santosh K. Yadav, J. F. Jesus, Armando Bernui
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Article
Physics, Particles & Fields
Rafael C. Nunes, Armando Bernui
EUROPEAN PHYSICAL JOURNAL C
(2020)
Article
Astronomy & Astrophysics
R. S. Goncalves, G. C. Carvalho, C. A. P. Bengaly, J. C. Carvalho, A. Bernui, J. S. Alcaniz, R. Maartens
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2018)
Article
Astronomy & Astrophysics
E. de Carvalho, A. Bernui, G. C. Carvalho, C. P. Novaes, H. S. Xavier
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2018)
Article
Astronomy & Astrophysics
G. C. Carvalho, A. Bernui, M. Benetti, J. C. Carvalho, J. S. Alcaniz
Article
Astronomy & Astrophysics
C. A. P. Bengaly, C. P. Novaes, H. S. Xavier, M. Bilicki, A. Bernui, J. S. Alcaniz
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2018)