Article
Astronomy & Astrophysics
P. Vielva, E. Martinez-Gonzalez, F. J. Casas, T. Matsumura, S. Henrot-Versille, E. Komatsu, J. Aumont, R. Aurlien, C. Baccigalupi, A. J. Banday, R. B. Barreiro, N. Bartolo, E. Calabrese, K. Cheung, F. Columbro, A. Coppolecchia, P. de Bernardis, T. de Haan, E. de la Hoz, M. De Petris, S. Della Torre, P. Diego-Palazuelos, H. K. Eriksen, J. Errard, F. Finelli, C. Franceschet, U. Fuskeland, M. Galloway, K. Ganga, M. Gervasi, R. T. Genova-Santos, T. Ghigna, E. Gjerlow, A. Gruppuso, M. Hazumi, D. Herranz, E. Hivon, K. Kohri, L. Lamagna, C. Leloup, J. Macias-Perez, S. Masi, F. T. Matsuda, G. Morgante, R. Nakano, F. Nati, P. Natoli, S. Nerval, K. Odagiri, S. Oguri, L. Pagano, A. Paiella, D. Paoletti, F. Piacentini, G. Polenta, G. Puglisi, M. Remazeilles, A. Ritacco, J. A. Rubino-Martin, D. Scott, Y. Sekimoto, M. Shiraishi, G. Signorelli, H. Takakura, A. Tartari, K. L. Thompson, M. Tristram, L. Vacher, N. Vittorio, I. K. Wehus, M. Zannoni
Summary: A methodology to determine the polarization angle requirements for different sets of detectors in CMB polarization experiments is presented. By using a linear combination of detector sets and assuming small angle uncertainties, analytic expressions are derived to establish the requirements. The methodology also considers possible correlations among detectors. Applied to the LiteBIRD space mission, it is found that the polarization angle requirements vary depending on the level of correlation of the systematics and the frequency bands.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Marius Lungu, Emilie R. Storer, Matthew Hasselfield, Adriaan J. Duivenvoorden, Erminia Calabrese, Grace E. Chesmore, Steve K. Choi, Jo Dunkley, Rolando Dunner, Patricio A. Gallardo, Joseph E. Golec, Yilun Guan, J. Colin Hill, Adam D. Hincks, Johannes Hubmayr, Mathew S. Madhavacheril, Maya Mallaby-Kay, Jeff McMahon, Kavilan Moodley, Sigurd Naess, Federico Nati, Michael D. Niemack, Lyman A. Page, Bruce Partridge, Roberto Puddu, Alessandro Schillaci, Cristobal Sifon, Suzanne Staggs, Dhaneshwar D. Sunder, Edward J. Wollack, Zhilei Xu
Summary: This study describes the measurement and treatment of telescope beams for the Atacama Cosmology Telescope. The central portion of the beams is measured and corrected using observations of Uranus. Various corrections are applied to improve the precision of cosmology research. The study also investigates the temperature-to-polarization leakage in the beams and measures the polarized sidelobes.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
A. Paiella, A. Coppolecchia, P. de Bernardis, S. Masi, A. Cruciani, L. Lamagna, G. Pettinari, F. Piacentini, M. Bersanelli, F. Cavaliere, C. Franceschet, M. Gervasi, A. Limonta, S. Mandelli, E. Manzan, A. Mennella, A. Passerini, E. Tommasi, A. Volpe, M. Zannoni
Summary: This paper presents the development and optimization of two types of lumped element kinetic inductance detector arrays for precision measurements of Cosmic Microwave Background (CMB) radiation in the D-band. The arrays are designed to detect the total power and polarization of the incoming radiation, making them suitable for measuring unpolarized spectral distortions of the CMB. The detectors are shown to be photon-noise limited under a radiative background, and their sensitivity to cosmic rays has been validated.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
S. L. Stever, T. Ghigna, M. Tominaga, G. Puglisi, M. Tsujimoto, M. Zeccoli Marazzini, M. Baratto, M. Tomasi, Y. Minami, S. Sugiyama, A. Kato, T. Matsumura, H. Ishino, G. Patanchon, M. Hazumi
Summary: This study aims to evaluate the expected scale of cosmic ray effects on the LiteBIRD space mission and presents an end-to-end simulator for simulating data. Results demonstrate that some detectors in the 166 GHz band of the LiteBIRD space mission may be affected by cosmic ray effects.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
M. Piat, G. Stankowiak, E. S. Battistelli, P. de Bernardis, G. D'Alessandro, M. De Petris, L. Grandsire, J-Ch Hamilton, T. D. Hoang, S. Marnieros, S. Masi, A. Mennella, L. Mousset, C. O'Sullivan, D. Prele, A. Tartari, J-P Thermeau, S. A. Torchinsky, F. Voisin, M. Zannoni, P. Ade, J. G. Alberro, A. Almela, G. Amico, L. H. Arnaldi, D. Auguste, J. Aumont, S. Azzoni, S. Banfi, A. Bau, B. Belier, D. Bennett, L. Berge, J-Ph Bernard, M. Bersanelli, M-A Bigot-Sazy, J. Bonaparte, J. Bonis, E. Bunn, D. Burke, D. Buzi, F. Cavaliere, P. Chanial, C. Chapron, R. Charlassier, A. C. Cobos Cerutti, F. Columbro, A. Coppolecchia, G. De Gasperis, M. De Leo, S. Dheilly, C. Duca, L. Dumoulin, A. Etchegoyen, A. Fasciszewski, L. P. Ferreyro, D. Fracchia, C. Franceschet, M. M. Gamboa Lerena, K. M. Ganga, B. Garcia, M. E. Garcia Redondo, M. Gaspard, D. Gayer, M. Gervasi, M. Giard, V Gilles, Y. Giraud-Heraud, M. Gomez Berisso, M. Gonzalez, M. Gradziel, M. R. Hampel, D. Harari, S. Henrot-Versille, F. Incardona, E. Jules, J. Kaplan, C. Kristukat, L. Lamagna, S. Loucatos, T. Louis, B. Maffei, W. Marty, A. Mattei, A. May, M. McCulloch, L. Mele, D. Melo, L. Montier, L. M. Mundo, J. A. Murphy, J. D. Murphy, F. Nati, E. Olivieri, C. Oriol, A. Paiella, F. Pajot, A. Passerini, H. Pastoriza, A. Pelosi, C. Perbost, M. Perciballi, F. Pezzotta, F. Piacentini, L. Piccirillo, G. Pisano, M. Platino, G. Polenta, R. Puddu, D. Rambaud, E. Rasztocky, P. Ringegni, G. E. Romero, J. M. Salum, A. Schillaci, C. G. Scoccola, S. Scully, S. Spinelli, M. Stolpovskiy, A. D. Supanitsky, P. Timbie, M. Tomasi, C. Tucker, G. Tucker, D. Vigano, N. Vittorio, F. Wicek, M. Wright, A. Zullo
Summary: This article reports on the performance and characterization of the readout chain and transition edge sensors (TES) in the prototype version of the QUBIC bolometric interferometer for cosmology. The results show that the device is capable of conducting bolometric interferometry.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
F. Cavaliere, A. Mennella, M. Zannoni, P. Battaglia, E. S. Battistelli, P. de Bernardis, D. Burke, G. D'Alessandro, M. De Petris, C. Franceschet, L. Grandsire, J-Ch Hamilton, B. Maffei, E. Manzan, S. Marnieros, S. Masi, C. O'Sullivan, A. Passerini, F. Pezzotta, M. Piat, A. Tartari, S. A. Torchinsky, D. Vigano, F. Voisin, P. Ade, J. G. Alberro, A. Almela, G. Amico, L. H. Arnaldi, D. Auguste, J. Aumont, S. Azzoni, S. Banfi, A. Bau, B. Belier, D. Bennett, L. Berge, J-Ph Bernard, M. Bersanelli, M-A Bigot-Sazy, J. Bonaparte, J. Bonis, E. Bunn, D. Buzi, P. Chanial, C. Chapron, R. Charlassier, A. C. Cobos Cerutti, F. Columbro, A. Coppolecchia, G. De Gasperis, M. De Leo, S. Dheilly, C. Duca, L. Dumoulin, A. Etchegoyen, A. Fasciszewski, L. P. Ferreyro, D. Fracchia, M. M. Gamboa Lerena, K. M. Ganga, B. Garcia, M. E. Garcia Redondo, M. Gaspard, D. Gayer, M. Gervasi, M. Giard, V Gilles, Y. Giraud-Heraud, M. Gomez Berisso, M. Gonzalez, M. Gradziel, M. R. Hampel, D. Harari, S. Henrot-Versille, F. Incardona, E. Jules, J. Kaplan, C. Kristukat, L. Lamagna, S. Loucatos, T. Louis, W. Marty, A. Mattei, A. May, M. McCulloch, L. Mele, D. Melo, L. Montier, L. Mousset, L. M. Mundo, J. A. Murphy, J. D. Murphy, F. Nati, E. Olivieri, C. Oriol, A. Paiella, F. Pajot, H. Pastoriza, A. Pelosi, C. Perbost, M. Perciballi, F. Piacentini, L. Piccirillo, G. Pisano, M. Platino, G. Polenta, D. Prele, R. Puddu, D. Rambaud, E. Rasztocky, P. Ringegni, G. E. Romero, J. M. Salum, A. Schillaci, C. G. Scoccola, S. Scully, S. Spinelli, G. Stankowiak, M. Stolpovskiy, A. D. Supanitsky, J-P Thermeau, P. Timbie, M. Tomasi, C. Tucker, G. Tucker, N. Vittorio, F. Wicek, M. Wright, A. Zullo
Summary: This paper presents the design, manufacturing, and performance of the horn-switch system for the QUBIC technological demonstrator. The system, consisting of 64 dual-band corrugated feed-horns and mechanical switches, is used for selecting desired baselines during the instrument self-calibration. The electromagnetic performance of the feedhorns agrees with simulations, and the switches exhibit good return and insertion losses consistency and high isolation at 150 GHz.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
G. D'Alessandro, L. Mele, F. Columbro, G. Amico, E. S. Battistelli, P. de Bernardis, A. Coppolecchia, M. De Petris, L. Grandsire, J-Ch Hamilton, L. Lamagna, S. Marnieros, S. Masi, A. Mennella, C. O'Sullivan, A. Paiella, F. Piacentini, M. Piat, G. Pisano, G. Presta, A. Tartari, S. A. Torchinsky, F. Voisin, M. Zannoni, P. Ade, J. G. Alberro, A. Almela, L. H. Arnaldi, D. Auguste, J. Aumont, S. Azzoni, S. Banfi, A. Bau, B. Belier, D. Bennett, L. Berge, J-Ph Bernard, M. Bersanelli, M-A Bigot-Sazy, J. Bonaparte, J. Bonis, E. Bunn, D. Burke, D. Buzi, F. Cavaliere, P. Chanial, C. Chapron, R. Charlassier, A. C. Cobos Cerutti, G. De Gasperis, M. De Leo, S. Dheilly, C. Duca, L. Dumoulin, A. Etchegoyen, A. Fasciszewski, L. P. Ferreyro, D. Fracchia, C. Franceschet, M. M. Gamboa Lerena, K. M. Ganga, B. Garcia, M. E. Garcia Redondo, M. Gaspard, D. Gayer, M. Gervasi, M. Giard, V Gilles, Y. Giraud-Heraud, M. Gomez Berisso, M. Gonzalez, M. Gradziel, M. R. Hampel, D. Harari, S. Henrot-Versille, F. Incardona, E. Jules, J. Kaplan, C. Kristukat, S. Loucatos, T. Louis, B. Maffei, W. Marty, A. Mattei, A. May, M. McCulloch, D. Melo, L. Montier, L. Mousset, L. M. Mundo, J. A. Murphy, J. D. Murphy, F. Nati, E. Olivieri, C. Oriol, F. Pajot, A. Passerini, H. Pastoriza, A. Pelosi, C. Perbost, M. Perciballi, F. Pezzotta, L. Piccirillo, M. Platino, G. Polenta, D. Prele, R. Puddu, D. Rambaud, E. Rasztocky, P. Ringegni, G. E. Romero, J. M. Salum, A. Schillaci, C. G. Scoccola, S. Scully, S. Spinelli, G. Stankowiak, M. Stolpovskiy, A. D. Supanitsky, J-P Thermeau, P. Timbie, M. Tomasi, C. Tucker, G. Tucker, D. Vigano, N. Vittorio, F. Wicek, M. Wright, A. Zullo
Summary: This paper presents the design and testing results of a crucial optical element, half-wave plate (HWP), for the QUBIC experiment. The rotating precision of the QUBIC HWP reaches 0.15 degrees using a stepper motor and custom-made optical encoder, without causing any thermal issues during measurements. Finite element thermal simulations estimate a maximum temperature gradient within the HWP of <= 10 mK. Polarization modulation measurements at 150 GHz demonstrate a polarization efficiency of over 99%.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Joel Williams, Nialh McCallum, Aditya Rotti, Daniel B. Thomas, Richard Battye, Michael L. Brown
Summary: This study presents a detailed case study using QE estimators to diagnose and remove systematics in observed CMB maps, focusing on temperature to polarization leakage. A new Gaussian filtering scheme is introduced for stable convergence of iterative cleaning process, and performance is evaluated on idealized and realistic simulations. Likelihood analysis demonstrates unbiased measurement of the tensor-to-scalar ratio, reducing systematic induced B-mode power significantly.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
C. O'Sullivan, M. De Petris, G. Amico, E. S. Battistelli, P. de Bernardis, D. Burke, D. Buzi, C. Chapron, L. Conversi, G. D'Alessandro, M. De Leo, D. Gayer, L. Grandsire, J-Ch Hamilton, S. Marnieros, S. Masi, A. Mattei, A. Mennella, L. Mousset, J. D. Murphy, A. Pelosi, M. Perciballi, M. Piat, S. Scully, A. Tartari, S. A. Torchinsky, F. Voisin, M. Zannoni, A. Zullo, P. Ade, J. G. Alberro, A. Almela, L. H. Arnaldi, D. Auguste, J. Aumont, S. Azzoni, S. Banfi, A. Bau, B. Belier, D. Bennett, L. Berge, J-Ph Bernard, M. Bersanelli, M-A Bigot-Sazy, J. Bonaparte, J. Bonis, E. Bunn, F. Cavaliere, P. Chanial, R. Charlassier, A. C. Cobos Cerutti, F. Columbro, A. Coppolecchia, G. De Gasperis, S. Dheilly, C. Duca, L. Dumoulin, A. Etchegoyen, A. Fasciszewski, L. P. Ferreyro, D. Fracchia, C. Franceschet, M. M. Gamboa Lerena, K. M. Ganga, B. Garcia, M. E. Garcia Redondo, M. Gaspard, M. Gervasi, M. Giard, V Gilles, Y. Giraud-Heraud, M. Gomez Berisso, M. Gonzalez, M. Gradziel, M. R. Hampel, D. Harari, S. Henrot-Versille, F. Incardona, E. Jules, J. Kaplan, C. Kristukat, L. Lamagna, S. Loucatos, T. Louis, B. Maffei, W. Marty, A. May, M. McCulloch, L. Mele, D. Melo, L. Montier, L. M. Mundo, J. A. Murphy, F. Nati, E. Olivieri, C. Oriol, A. Paiella, F. Pajot, A. Passerini, H. Pastoriza, C. Perbost, F. Pezzotta, F. Piacentini, L. Piccirillo, G. Pisano, M. Platino, G. Polenta, D. Prele, R. Puddu, D. Rambaud, E. Rasztocky, P. Ringegni, G. E. Romero, J. M. Salum, A. Schillaci, C. G. Scoccola, S. Spinelli, G. Stankowiak, M. Stolpovskiy, A. D. Supanitsky, J-P Thermeau, P. Timbie, M. Tomasi, C. Tucker, G. Tucker, D. Vigano, N. Vittorio, F. Wicek, M. Wright
Summary: QUBIC is a ground-based experiment aiming to detect B-mode polarization anisotropies in the CMB. It mitigates the systematic errors of ground-based observations using the novel technique of bolometric interferometry, which combines the sensitivity of an imager with the error control of an interferometer.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
S. A. Torchinsky, J. -Ch Hamilton, M. Piat, E. S. Battistelli, P. de Bernardis, C. Chapron, G. D'Alessandro, M. De Petris, M. M. Gamboa Lerena, M. Gonzalez, L. Grandsire, S. Marnieros, S. Masi, A. Mennella, L. Mousset, J. D. Murphy, C. O'Sullivan, D. Prele, G. Stankowiak, A. Tartari, J. -P. Thermeau, F. Voisin, M. Zannoni, P. Ade, J. G. Alberro, A. Almela, G. Amico, L. H. Arnaldi, D. Auguste, J. Aumont, S. Azzoni, S. Banfi, A. Bau, B. Belier, D. Bennett, L. Berge, J. -Ph Bernard, M. Bersanelli, M. -A. Bigot-Sazy, J. Bonaparte, J. Bonis, E. Bunn, D. Burke, D. Buzi, F. Cavaliere, P. Chanial, R. Charlassier, A. C. Cobos Cerutti, F. Columbro, A. Coppolecchia, G. De Gasperis, M. De Leo, S. Dheilly, C. Duca, L. Dumoulin, A. Etchegoyen, A. Fasciszewski, L. P. Ferreyro, D. Fracchia, C. Franceschet, K. M. Ganga, B. Garcia, M. E. Garcia Redondo, M. Gaspard, D. Gayer, M. Gervasi, M. Giard, V. Gilles, Y. Giraud-Heraud, M. Gomez Berisso, M. Gradziel, M. R. Hampel, D. Harari, S. Henrot-Versille, F. Incardona, E. Jules, J. Kaplan, C. Kristukat, L. Lamagna, S. Loucatos, T. Louis, B. Maffei, W. Marty, A. Mattei, A. May, M. McCulloch, L. Mele, D. Melo, L. Montier, L. M. Mundo, J. A. Murphy, F. Nati, E. Olivieri, C. Oriol, A. Paiella, F. Pajot, A. Passerini, H. Pastoriza, A. Pelosi, C. Perbost, M. Perciballi, F. Pezzotta, F. Piacentini, L. Piccirillo, G. Pisano, M. Platino, G. Polenta, R. Puddu, D. Rambaud, E. Rasztocky, P. Ringegni, G. E. Romero, J. M. Salum, A. Schillaci, C. G. Scoccola, S. Scully, S. Spinelli, M. Stolpovskiy, A. D. Supanitsky, P. Timbie, M. Tomasi, C. Tucker, G. Tucker, D. Vigano, N. Vittorio, F. Wicek, M. Wright, A. Zullo
Summary: This article reports on an extensive test campaign of a prototype version of the QUBIC instrument in Paris, demonstrating the viability of bolometric interferometry for measurements of the CMB polarization.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
S. Masi, P. de Bernardis, C. Chapron, F. Columbro, A. Coppolecchia, G. D'Alessandro, E. S. Battistelli, M. De Petris, L. Grandsire, J-Ch Hamilton, L. Lamagna, S. Marnieros, A. May, L. Mele, A. Mennella, C. O'Sullivan, A. Paiella, F. Piacentini, M. Piat, L. Piccirillo, G. Presta, A. Schillaci, A. Tartari, J-P Thermeau, S. A. Torchinsky, F. Voisin, M. Zannoni, P. Ade, J. G. Alberro, A. Almela, G. Amico, L. H. Arnaldi, D. Auguste, J. Aumont, S. Azzoni, S. Banfi, A. Bau, B. Belier, D. Bennett, L. Berge, J-Ph Bernard, M. Bersanelli, M-A Bigot-Sazy, J. Bonaparte, J. Bonis, E. Bunn, D. Burke, D. Buzi, F. Cavaliere, P. Chanial, R. Charlassier, A. C. Cobos Cerutti, G. De Gasperis, M. De Leo, S. Dheilly, C. Duca, L. Dumoulin, A. Etchegoyen, A. Fasciszewski, L. P. Ferreyro, D. Fracchia, C. Franceschet, M. M. Gamboa Lerena, K. M. Ganga, B. Garcia, M. E. Garcia Redondo, M. Gaspard, D. Gayer, M. Gervasi, M. Giard, V Gilles, Y. Giraud-Heraud, M. Gomez Berisso, M. Gonzalez, M. Gradziel, M. R. Hampel, D. Harari, S. Henrot-Versille, F. Incardona, E. Jules, J. Kaplan, C. Kristukat, S. Loucatos, T. Louis, B. Maffei, W. Marty, A. Mattei, M. McCulloch, D. Melo, L. Montier, L. Mousset, L. M. Mundo, J. A. Murphy, J. D. Murphy, F. Nati, E. Olivieri, C. Oriol, F. Pajot, A. Passerini, H. Pastoriza, A. Pelosi, C. Perbost, M. Perciballi, F. Pezzotta, G. Pisano, M. Platino, G. Polenta, D. Prele, R. Puddu, D. Rambaud, E. Rasztocky, P. Ringegni, G. E. Romero, J. M. Salum, C. G. Scoccola, S. Scully, S. Spinelli, G. Stankowiak, M. Stolpovskiy, A. D. Supanitsky, P. Timbie, M. Tomasi, C. Tucker, G. Tucker, D. Vigano, N. Vittorio, F. Wicek, M. Wright, A. Zullo
Summary: This study describes the design and experimental validation of the cryogenic system for the QUBIC experiment, which aims to measure the polarization of the Cosmic Microwave Background (CMB). The system has a large volume and mass, and uses cryogenic detector arrays and cold optical systems to enhance mapping speed. After more than 6 months of continuous operation testing, the system has been proven to operate stably.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Optics
Timon Schapeler, Tim J. Bartley
Summary: In this study, we compare different multiplexing architectures of quantum detectors and gain insights into their photon-number-resolving ability based on the purity of measurement outcomes. We also calculate the information that each measurement outcome can extract from a given dimensional Hilbert space. Our findings confirm that increasing the number of multiplexing outcomes can improve photon-number-resolving ability, but the optimization of the splitting between those outcomes is also crucial.
Article
Astronomy & Astrophysics
Giacomo Galloni, Nicola Bartolo, Sabino Matarrese, Marina Migliaccio, Angelo Ricciardone, Nicola Vittorio
Summary: We updated the limits on the tensor-to-scalar ratio (r) and the tensor spectral index (nt) using 10 datasets from various sources. Our analysis determined the most reliable method and provided the strongest constraints on the tensor-to-scalar ratio to date: r < 0.028 and -1.37 < nt < 0.42 at 95% confidence level. Additionally, we found that a simple power-law cannot explain the constraints from different datasets regarding the NANOGrav detection of a common signal, indicating the presence of a primordial inflationary gravitational wave background.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
E. de la Hoz, P. Diego-Palazuelos, E. Martinez-Gonzalez, P. Vielva, R. B. Barreiro, J. D. Bilbao-Ahedo
Summary: This paper introduces an iterative maximum likelihood-based method to calculate polarization angles in order to control systematics. The effectiveness of this method is demonstrated through component separation analysis, showing improvement in rotation angle estimation and reduction of systematic residuals caused by non-null calibration polarization angles at the power spectrum level.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Giacomo Galloni, Nicola Bartolo, Sabino Matarrese, Marina Migliaccio, Angelo Ricciardone, Nicola Vittorio
Summary: This study investigates the physical origin of the power asymmetry in the Cosmic Microwave Background (CMB) using the Cosmological Gravitational Wave Background (CGWB) detected by future GW detectors. The researchers analyze the evolution of gravitons in the presence of a modulating field in the scalar gravitational potentials and infer the amplitude of this modulating field. The addition of the CGWB improves the assessment of the physical origin of the CMB power asymmetry, highlighting the potential role of the CGWB in understanding this anomaly.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)