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
Claudia de Rham, Scott Melville, Johannes Noller
Summary: Positivity bounds have been used to constrain scalar-tensor theories of dark energy, but coupling to matter fields has played a limited role. Demanding positivity when including interactions with standard matter fields leads to further constraints on the dark energy parameter space. Implementing these bounds as theoretical priors affects cosmological parameter constraints and shows that gravitational waves must travel superluminally on cosmological backgrounds in a standard UV completion.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Marco Raveri, Levon Pogosian, Matteo Martinelli, Kazuya Koyama, Alessandra Silvestri, Gong -Bo Zhao
Summary: In this paper, a non-parametric reconstruction method is presented to determine three time-dependent functions in the cosmological model. The data constraints on the structure of these functions and their eigenmodes are analyzed. The results show that the combination of all data can constrain 15 combined eigenmodes of the three functions and explain the tensions between datasets.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Cameron C. Thomas, Carsten van de Bruck
Summary: If dark energy is dynamical, it is expected to be coupled to matter, especially dark matter. Recent studies show that the coupling can become non-zero during the domination of dark energy, leading to violations of the equivalence principle in the dark sector. However, current observations and cosmological background evolution have weak constraints on these violations, and further studies in the non-linear regime are needed.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Yuejia Zhai, William Giare, Carsten van de Bruck, Eleonora Di Valentino, Olga Mena, Rafael C. Nunes
Summary: We analyze a cosmological model with interaction between dark energy and dark matter using data from three independent experiments: Planck, Atacama Cosmology Telescope, and WMAP. Regardless of the combination of datasets, the results consistently support an interacting dark sector with a 95% confidence level. This preference remains consistent when cross-checked with independent probes and yields a value for the expansion rate H0 consistent with local distance ladder measurements.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Wilmar Cardona, M. A. Sabogal
Summary: Interesting discrepancies in cosmological parameters challenge the success of the ACDM model. The Hubble constant and matter clustering strength derived from various measurements are higher/lower than those inferred from the Cosmic Microwave Background (CMB) in the context of ACDM. In this study, we propose a Dark Energy (DE) model with an evolving equation of state and constant sound speed squared to address these discrepancies. By considering the impact of DE sound speed on gravitational potential evolution, we find good agreement between our results and low redshift probes, but tension with BBN constraints in the case of baryon energy density.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Alvaro de la Cruz Dombriz, Francisco Jose Maldonado Torralba, David F. Mota
Summary: The stable pseudo-scalar degree of freedom in the quadratic Poincare Gauge theory of gravity is identified as a suitable candidate for dark matter. The study determines the parameter space in the theory that can explain all predicted cold dark matter phenomena and constrains these parameters with astrophysical observations.
Article
Astronomy & Astrophysics
Mark S. Linton, Robert Crittenden, Alkistis Pourtsidou
Summary: We investigated two models of interacting dark energy that only interact through momentum exchange. Global fitting of cosmological parameters showed that these models are competitive with ACDM.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Emil Brinch Holm, Thomas Tram, Steen Hannestad
Summary: Decaying dark matter models can impact the predicted value of the Hubble constant and bridge the discrepancies between CMB inferences and local measurements. In this study, a reevaluation of the warm dark matter decaying model is performed, including the mass of the decaying species, and its ability to alleviate tensions in Hubble and sigma(8) is assessed. The model shows mild improvements but further research is required to fully evaluate its effectiveness.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Weiqiang Yang, Supriya Pan, Eleonora Di Valentino, Olga Mena, Alessandro Melchiorri
Summary: Current cosmological data analyses show that a closed universe and interacting scenarios are attractive options for resolving the Hubble constant tension. However, the viability of these scenarios as global solutions to cosmological tensions may be compromised when considering other possible cosmological observations.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Zack Li, Rui An, Vera Gluscevic, Kimberly K. Boddy, J. Richard Bond, Erminia Calabrese, Jo Dunkley, Patricio A. Gallardo, Yilun Guan, Adam Hincks, Kevin M. Huffenberger, Arthur Kosowsky, Thibaut Louis, Mathew S. Madhavacheril, Kavilan Moodley, Lyman A. Page, Bruce Partridge, Frank J. Qu, Maria Salatino, Blake Sherwin, Cristobal Sifon, Cristian Vargas, Edward J. Wollack
Summary: Measurements of the cosmic microwave background (CMB) provide constraints on the interaction between dark matter and baryonic matter, which is crucial for understanding the particle nature of dark matter.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Mohammad Ali Gorji, Hayato Motohashi, Shinji Mukohyama
Summary: In the context of scalar-tensor theories, stealth de Sitter solutions face issues of infinite strong coupling or gradient instability, which can be resolved by introducing a controlled detuning mechanism known as scordatura. This mechanism not only resolves the mentioned issues, but also ensures a well-defined quasi-static limit.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
M. Benetti, H. A. Borges, C. Pigozzo, S. Carneiro, J. S. Alcaniz
Summary: The observational viability of a class of interacting dark energy (iDE) models was investigated, with the best-fit favoring a positive interaction and ruling out the non-interacting case. A significant anti-correlation between the interaction parameter and the universe density curvature was found when considering a non-zero spatial curvature. The influence of the SHOES prior on the expansion rate had a significant impact on the results of the iDE model, but did not considerably change standard cosmology predictions.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Javier E. Gonzalez, Micol Benetti, Rodrigo von Marttens, Jailson Alcaniz
Summary: The paper discusses the implications of joint analyses using current data sets, focusing on non-flat universe and extensions of the standard cosmological model. Results suggest potential misleading conclusions in joint analysis, highlighting the dependence on spatial curvature and dark energy parameterizations.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
M. Berti, M. Spinelli, B. S. Haridasu, M. Viel, A. Silvestri
Summary: In this study, we explore constraints on dark energy and modified gravity using forecasted 21cm intensity mapping measurements. We find that adding the power spectrum of the 21cm signal to the latest CMB data significantly tightens the constraints on certain parameters. We also demonstrate the importance of tomography in improving the constraining power on theories beyond the standard ΛCDM model.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
J. -E. Campagne, J. Neveu, S. Plaszczynski
ASTRONOMY & ASTROPHYSICS
(2017)
Article
Astronomy & Astrophysics
F. Levrier, J. Neveu, E. Falgarone, F. Boulanger, A. Bracco, T. Ghosh, F. Vansyngel
ASTRONOMY & ASTROPHYSICS
(2018)
Article
Astronomy & Astrophysics
M. Roman, D. Hardin, M. Betoule, P. Astier, C. Balland, R. S. Ellis, S. Fabbro, J. Guy, I. Hook, D. A. Howell, C. Lidman, A. Mitra, A. Moeller, A. M. Mourao, J. Neveu, N. Palanque-Delabrouille, C. J. Pritchet, N. Regnault, V. Ruhlmann-Kleider, C. Saunders, M. Sullivan
ASTRONOMY & ASTROPHYSICS
(2018)
Article
Astronomy & Astrophysics
C. Balland, F. Cellier-Holzem, C. Lidman, P. Astier, M. Betoule, R. G. Carlberg, A. Conley, R. S. Ellis, J. Guy, D. Hardin, I. M. Hook, D. A. Howell, R. Pain, C. J. Pritchet, N. Regnault, M. Sullivan, V. Arsenijevic, S. Baumont, P. El-Hage, S. Fabbro, D. Fouchez, A. Mitra, A. Moller, A. M. Mourao, J. Neveu, M. Roman, V. Ruhlmann-Kleider
ASTRONOMY & ASTROPHYSICS
(2018)
Article
Astronomy & Astrophysics
F. Levrier, J. Neveu, E. Falgarone, F. Boulanger, A. Bracco, T. Ghosh, F. Vansyngel
ASTRONOMY & ASTROPHYSICS
(2018)
Article
Astronomy & Astrophysics
M. Roman, D. Hardin, M. Betoule, P. Astier, C. Balland, R. S. Ellis, S. Fabbro, J. Guy, I. Hook, D. A. Howell, C. Lidman, A. Mitra, A. Moeller, A. M. Mourao, J. Neveu, N. Palanque-Delabrouille, C. J. Pritchet, N. Regnault, V. Ruhlmann-Kleider, C. Saunders, M. Sullivan
ASTRONOMY & ASTROPHYSICS
(2018)
Article
Astronomy & Astrophysics
C. Balland, F. Cellier-Holzem, C. Lidman, P. Astier, M. Betoule, R. G. Carlberg, A. Conley, R. S. Ellis, J. Guy, D. Hardin, I. M. Hook, D. A. Howell, R. Pain, C. J. Pritchet, N. Regnault, M. Sullivan, V. Arsenijevic, S. Baumont, P. El-Hage, S. Fabbro, D. Fouchez, A. Mitra, A. Moller, A. M. Mourao, J. Neveu, M. Roman, V. Ruhlmann-Kleider
ASTRONOMY & ASTROPHYSICS
(2018)
Article
Astronomy & Astrophysics
Anais Moller, Julien Peloton, Emille E. O. Ishida, Chris Arnault, Etienne Bachelet, Tristan Blaineau, Dominique Boutigny, Abhishek Chauhan, Emmanuel Gangler, Fabio Hernandez, Julius Hrivnac, Marco Leoni, Nicolas Leroy, Marc Moniez, Sacha Pateyron, Adrien Ramparison, Damien Turpin, Reza Ansari, Tarek Allam, Armelle Bajat, Biswajit Biswas, Alexandre Boucaud, Johan Bregeon, Jean-Eric Campagne, Johann Cohen-Tanugi, Alexis Coleiro, Damien Dornic, Dominique Fouchez, Olivier Godet, Philippe Gris, Sergey Karpov, Ada Nebot Gomez-Moran, Jeremy Neveu, Stephane Plaszczynski, Volodymyr Savchenko, Natalie Webb
Summary: FINK is a broker designed to support science with large time-domain alert streams, offering traditional broker features as well as real-time transient classification improved by advanced learning techniques. This tool aims to enhance the accuracy of scientific output from LSST photometric data and increase the frequency of new discoveries.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Alain Blanchard, Eric Aubourg, Philippe Brax, Francisco J. Castander, Sandrine Codis, Stephanie Escoffier, Fabien Dournac, Agnes Ferte, Fabio Finelli, Pablo Fosalba, Emmanuel Gangler, Satya Gontcho A. Gontcho, Adam Hawken, Stephane Ilic, Jean-Paul Kneib, Martin Kunz, Guilhem Lavaux, Olivier Le Fevre, Julien Lesgourgues, Yannick Mellier, Jeremy Neveu, Yann Rasera, Cecile Renault, Marina Ricci, Ziad Sakr, Norma G. Sanchez, Isaac Tutusaus, Safir Yahia-Cherif
Summary: The concordance cosmological model is currently the most robust in describing the evolution and content of the Universe. Understanding this model requires mapping the observable Universe over cosmic time, with missions like LiteBIRD testing inflation and Euclid mapping dark energy. The GAUSS mission aims to fully map the cosmic web, addressing crucial degeneracies between various components of the Universe.
EXPERIMENTAL ASTRONOMY
(2021)
Article
Astronomy & Astrophysics
M. Moniez, J. Neveu, S. Dagoret-Campagne, Y. Gentet, L. Le Guillou
Summary: The paper presents the testing of a holographic optical element as an aberration-corrected grating for a telescope slitless spectrograph, showing promising results. The holographic disperser prototypes produce significantly better focused spectra compared to regular gratings, approaching theoretical performance in resolution. The roadmap for producing a competitive holographic element for the Vera Rubin Observatory auxiliary telescope has been established.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Marc Betoule, Sarah Antier, Emmanuel Bertin, Pierre Eric Blanc, Sebastien Bongard, Johann Cohen Tanugi, Sylvie Dagoret-Campagne, Fabrice Feinstein, Delphine Hardin, Claire Juramy, Laurent Le Guillou, Auguste Le Van Suu, Marc Moniez, Jeremy Neveu, Eric Nuss, Bertrand Plez, Nicolas Regnault, Eduardo Sepulveda, Kelian Sommer, Thierry Souverin, Xiao Feng Wang
Summary: This study aims to establish a five-stage metrology chain from NIST photodiodes to stars, improving the link between existing astrophysical flux standards and laboratory standards. The calibration transfer from NIST photodiodes to a demonstration CMOS sensor was successfully achieved, providing full characterization of the camera. The results demonstrate high stability, homogeneity, and quantum efficiency of the camera, making it suitable for various astronomical imaging applications.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
C. Leloup, L. Heitz, J. Neveu
Summary: The DBI-Galileon model is a scalar-tensor theory of gravity with clear physical meaning parameters, but it exhibits fatal instability in the non-relativistic limit.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Astronomy & Astrophysics
Nora Elisa Chisari, David Alonso, Elisabeth Krause, C. Danielle Leonard, Philip Bull, Jeremy Neveu, Antonio Villarreal, Sukhdeep Singh, Thomas McClintock, John Ellison, Zilong Du, Joe Zuntz, Alexander Mead, Shahab Joudaki, Christiane S. Lorenz, Tilman Troster, Javier Sanchez, Francois Lanusse, Mustapha Ishak, Renee Hlozek, Jonathan Blazek, Jean-Eric Campagne, Husni Almoubayyed, Tim Eifler, Matthew Kirby, David Kirkby, Stephane Plaszczynski, Anze Slosar, Michal Vrastil, Erika L. Wagoner
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2019)
Article
Astronomy & Astrophysics
J. -E. Campagne, S. Plaszczynski, J. Neveu
ASTROPHYSICAL JOURNAL
(2017)