Found 615 results, showing the newest relevant preprints. Sort by relevancy only.Update me on new preprints

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.
8 days ago
4/10 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.
9 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.
9 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.
30 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.
31 days ago
4/10 relevant
arXiv

Interaction of Bianchi Type-I Anisotropic Cloud String Cosmological Model Universe with Electromagnetic Field

Here, we have investigated the interaction of Bianchi type I anisotropic cloud string cosmological model universe with electromagnetic field in the context of general relativity. Expand abstract.
38 days ago
7/10 relevant
arXiv

Constraining the anisotropy of the Universe via Pantheon supernovae sample

We test the possible dipole anisotropy of a Finslerian cosmological model and other three dipole-modulated cosmological models, i.e., the dipole-modulated $\rm{\Lambda}$CDM, $w$CDM and Chevallier--Polarski--Linder (CPL) model by using the recently released Pantheon sample of SNe Ia. Expand abstract.
38 days ago
9/10 relevant
arXiv

Non-Standard Cosmological Models and the trans-Planckian Censorship Conjecture

The trans-Planckian censorship conjecture (TCC) puts an upper bound on the Hubble parameter during inflation $H_{\rm inf}$ of order $0.1$ GeV. Expand abstract.
38 days ago
7/10 relevant
arXiv

Constraining a causal dissipative cosmological model

In this paper a cosmological solution of polynomial type $H \approx ( t + const.)^{-1}$ for the causal thermodynamical approach of Isarel-Stewart, found in \cite{MCruz:2017, Cruz2017}, is constrained using the joint of the latest measurements of the Hubble parameter (OHD) and Type Ia Supernovae (SNIa). Expand abstract.
57 days ago
5/10 relevant
arXiv

Cosmological Parameters from the BOSS Galaxy Power Spectrum

We present cosmological parameter measurements from the publicly available Baryon Oscillation Spectroscopic Survey (BOSS) data on anisotropic galaxy clustering in Fourier space. Expand abstract.
72 days ago
4/10 relevant
arXiv