Found 712 results, showing the newest relevant preprints. Sort by relevancy only.Update me on new preprints

Nonlinear interacting cosmological models after Planck 2018 legacy release and the $H_0$ tension

Interacting dark energy models are widely renowned for giving an explanation to the cosmic coincidence problem as well as several observational issues. Expand abstract.
12 days ago
10/10 relevant
arXiv

Quadratic integrals of a multi-scalar cosmological model

In the context of FRW spacetime with zero spatial curvature, we consider a multi-scalar tensor cosmology model under the pretext of obtaining quadratic conservation laws. Expand abstract.
44 days ago
7/10 relevant
arXiv

Disformally coupled quintessence

However, viable cosmological models seem to have suppressed disformal late-time contributions. Expand abstract.
52 days ago
7/10 relevant
arXiv

f(R)-gravity models constrained with cosmological data

In this work, we look at the cosmological constraints of four different f(R)-gravity models, which include 2 toy models and 2 more realistic models, such as the Starobinsky and Hu-Sawicki models. Expand abstract.
99 days ago
4/10 relevant
arXiv

Horizon thermodynamics in holographic cosmological models with a power-law term

Thermodynamics on the horizon of a flat universe at late times is studied in holographic cosmological models that assume an associated entropy on the horizon. Expand abstract.
99 days ago
10/10 relevant
arXiv

Extended FLRW Models: dynamical cancellation of cosmological anisotropies

We investigate a corner of the Bianchi models that has not received much attention: "extended FLRW models" (eFLRW) defined as a cosmological model with underlying anisotropic Bianchi geometry that nevertheless expands isotropically and can be mapped onto a reference FLRW model with the same expansion history. Expand abstract.
100 days ago
4/10 relevant
arXiv

A Map Between Primordial Power Spectra and the Effective Field Theory of Inflation

We have developed a precise dictionary between the spectrum of primordial density fluctuations and the parameters of the effective field theory (EFT) of inflation that determine the primordial power spectrum (PPS). Expand abstract.
100 days ago
5/10 relevant
arXiv

Standard Sirens as a novel probe of dark energy

Cosmological models with a dynamical dark energy field typically lead to a modified propagation of gravitational waves via an effectively time-varying gravitational coupling $G(t)$. Expand abstract.
121 days ago
5/10 relevant
arXiv

Connecting early and late epochs by f(z)CDM cosmography

The cosmographic approach is gaining considerable interest as a model-independent technique able to describe the late expansion of the universe. Expand abstract.
122 days ago
4/10 relevant
arXiv

The simplest cosmological model in $f(R,T)$ gravity

In the present work, we search the simplest cosmological model in $f(R,T)$ gravity by considering its functional form $f(R,T) = R + \xi R T$ with $\xi$ being positive constant. Expand abstract.
123 days ago
7/10 relevant
arXiv