Article
Astronomy & Astrophysics
Miguel Aparicio Resco, Antonio L. Maroto
Summary: The study analyzes how to parametrize general modifications of the dark matter perturbations equations in a model-independent way, and shows that a general model with an imperfect and non-conserved dark matter fluid in a modified gravity scenario can be described with five general functions. It focuses on the sub-Hubble regime and finds that observable power spectra are sensitive to only three combinations of the initial five functions, which can help determine whether a modification of gravity or an imperfect/non-conserved dark matter is present. A Fisher forecast analysis for these three parameters is performed, with an example shown for a specific model with shear viscosity.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Pedro Carrilho, Chiara Moretti, Benjamin Bose, Katarina Markovic, Alkistis Pourtsidou
Summary: Interacting dark energy models are proposed as alternatives to ACDM, and forthcoming galaxy clustering surveys will provide constraints on these models. This study compares three approaches of modeling non-linearities, considering a model with a simple 1-parameter extension to wCDM. Analysis using simulated data shows that the EFTofLSS-based model is better at describing data up to smaller scales and extracting more information, forecasting uncertainties on the dark energy equation of state and interaction parameter.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Peng-Ju Wu, Xin Zhang
Summary: The 21 cm intensity mapping technique is a powerful tool for measuring dark-energy parameters, with interferometers showing great potential for constraining cosmological parameters. The Tianlai cylinder array alone can achieve precision cosmology standards, while SKA1-MID performs well in constraining dynamical dark energy. Simulated 21 cm IM data can break parameter degeneracies and provide tighter constraints. Combining different observations offers promising survey strategies. The amplitude of residual foreground contamination significantly impacts constraint results.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Andrei Lazanu
Summary: Machine learning techniques accurately extract cosmological parameters Omega(m) and sigma(8) from N-body simulations, and also find these parameters from the non-linear matter power spectrum using random forest regressors and deep neural networks. The power spectrum provides competitive results in terms of accuracy compared to using simulations, and the scalar spectral index ns can also be estimated from the power spectrum with lower precision.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
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
Lea Fuss, Mathias Garny
Summary: Investigated the impact of the Decaying Cold Dark Matter (DCDM) model on the tension between cosmic microwave background (CMB) and large-scale structure measurements. Found that the Lyman-alpha forest data is compatible with the DCDM model and can provide improved constraints under certain parameter values.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Markus R. Mosbech, Celine Boehm, Yvonne Y. Y. Wong
Summary: Similar to warm dark matter, many interacting dark matter models predict a suppression of the matter power spectrum due to collisional damping. 21cm line intensity mapping can probe this suppression and set strong limits on dark matter-neutrino scattering. However, precise measurements of the matter power spectrum at high redshifts are needed to distinguish between warm dark matter and interacting scenarios.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Henrique Rubira, Asmaa Mazoun, Mathias Garny
Summary: We analyze BOSS-DR12 galaxy clustering data along with Planck legacy cosmic microwave background and baryon acoustic oscillation measurements to derive constraints on interacting dark matter-dark radiation models. The results suggest a fraction of interacting dark matter ranging from 10% to 100% and a dark radiation temperature smaller than the CMB by a factor of 0.1 to 0.15, reducing the tension to about 1 sigma level. The favored interaction rate is realized through a weakly coupled unbroken non-Abelian SU(N) gauge interaction in the dark sector.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Z. Sakr
Summary: In this study, we performed a Bayesian analysis on three beyond CDM phenomenological triggering parameters using the latest cosmological probes. Our results show that the constraints on these parameters are compatible with general relativity and CDM.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Wilmar Cardona, David Figueruelo
Summary: We investigated a cosmological model that allows momentum transfer between dark matter and dark energy. The interaction in the dark sector mainly affects perturbations on small scales but does not resolve the H0 tension. Cosmological constraints confirm the contribution of momentum transfer to the a-8 discrepancy in the standard model. Future galaxy surveys will provide important information for testing models allowing momentum transfer in the dark sector.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Jackson Levi Said, Jurgen Mifsud, Joseph Sultana, Kristian Zarb Adami
Summary: This study utilizes a combined approach of Hubble parameter and redshift-space-distortion data to reconstruct the teleparallel gravity Lagrangian via Gaussian processes. Different combinations of datasets and kernels indicate that nontrivial cosmology beyond ΛCDM falls within the uncertainties of the reconstructions, suggesting no significant departure from the concordance cosmological model.
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
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
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
Matthew Lewandowski, Ashley Perko, Leonardo Senatore
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2015)
Article
Astronomy & Astrophysics
Matthew Lewandowski, Azadeh Maleknejad, Leonardo Senatore
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2017)
Article
Astronomy & Astrophysics
Matthew Lewandowski, Leonardo Senatore
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2017)
Article
Astronomy & Astrophysics
Benjamin Bose, Kazuya Koyama, Matthew Lewandowski, Filippo Vernizzi, Hans A. Winther
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2018)
Article
Astronomy & Astrophysics
Giulia Cusin, Matthew Lewandowski, Filippo Vernizzi
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2018)
Article
Astronomy & Astrophysics
Paolo Creminelli, Matthew Lewandowski, Giovanni Tambalo, Filippo Vernizzi
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2018)
Article
Astronomy & Astrophysics
Matthew Lewandowski, Leonardo Senatore
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Physics, Multidisciplinary
Brando Bellazzini, Matthew Lewandowski, Javi Serra
PHYSICAL REVIEW LETTERS
(2019)
Article
Astronomy & Astrophysics
Matthew Lewandowski
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Astronomy & Astrophysics
Diogo P. L. Braganca, Matthew Lewandowski, David Sekera, Leonardo Senatore, Raphael Sgier
Summary: This paper extends the two-fluid system to two-loop order in perturbation theory, showing that a new linear counterterm proportional to the relative velocity of fluids may be present but its effects are expected to be small in the universe. The EFTofLSS at two-loop order accurately captures the baryonic processes on large scales and the differences in counterterms related to dark matter and baryons at different redshifts. The onset of star-formation physics is signaled around redshifts z ≈ 3 to z ≈ 2, which has implications for analyzing CMB-S4 data.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Physics, Particles & Fields
Brando Bellazzini, Giulia Isabella, Matthew Lewandowski, Francesco Sgarlata
Summary: We investigate the causality in gravitational systems beyond the classical limit. By employing on-shell methods, we examine the 1-loop corrections to the photon energy-momentum tensor caused by charged particles, which in turn influences the quantum interaction between two on-shell photons and one off-shell graviton. Our findings indicate that the principle of asymptotic causality is respected at the first post-Minkowskian order in quantum mechanics.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Marco Crisostomi, Matthew Lewandowski, Filippo Vernizzi
Article
Astronomy & Astrophysics
Marco Crisostomi, Matthew Lewandowski, Filippo Vernizzi
Article
Astronomy & Astrophysics
Matthew Lewandowski, Leonardo Senatore, Francisco Prada, Cheng Zhao, Chia-Hsun Chuang