The Hubble tension is inherently multidimensional and bears important implications for parameters beyond H0. We discuss the key role of matter density parameter Ωm physical cold dark ωc. argue that once baryon ωb are calibrated, through acoustic oscillations (BAO) and/or type Ia supernovae (SNeIa) Ωm, via big bang nucleosynthesis ωb, any model raising H0 requires ωc and, under minimal assumptions, also clustering S8. explicitly verify this behavior holds when analyzing recent BAO SNeIa data....

Abstract The recent DESI Baryon Acoustic Oscillation measurements have led to tight upper limits on the neutrino mass sum, potentially in tension with oscillation constraints requiring ∑ m ν ≳ 0.06 eV. Under physically motivated assumption of positive , we study extent which these are tightened by adding other available cosmological probes, and robustly quantify preference for normal ordering over inverted one, as well between terrestrial data. Combining data Cosmic Microwave Background...

Abstract We have witnessed different values of the Hubble constant being found in literature past years. Albeit, early measurements often result an H 0 much smaller than those from late-time ones, producing a statistically significant discrepancy, and giving rise to so-called tension. The trouble with is treated as cosmological problem. However, can be laboratory probe cosmology particle physics models. In our work, we will investigate if possibility explaining using non-thermal dark matter...

We analyze a fully geometric approach to dark energy in the framework of $F(R,{\cal G})$ theories gravity, where $R$ is Ricci curvature scalar and ${\cal G}$ Gauss-Bonnet topological invariant. The latter invariant naturally exhausts, together with $R$, whole content related invariants coming from Riemann tensor. In particular, we study class $F(R, {\cal models power law solutions find that, depending on value geometrical parameter, shift anisotropy peaks position temperature spectrum...

We use a dynamical system approach to study the cosmological viability of gravity theories. The method consists formulating evolution equations as an autonomous ordinary differential equations, using suitable variables. formalism is applied class models in which and its solutions corresponding stability are analysed detail. New accelerating that can be attractors phase space found. also find this does not exhibit matter-dominated epoch, solution inconsistent with current observations.

The recent DESI Baryon Acoustic Oscillation measurements have led to tight upper limits on the neutrino mass sum, potentially in tension with oscillation constraints requiring $\sum m_{\nu} \gtrsim 0.06\,{\text{eV}}$. Under physically motivated assumption of positive m_{\nu}$, we study extent which these are tightened by adding other available cosmological probes, and robustly quantify preference for normal ordering over inverted one, as well between terrestrial data. Combining data Cosmic...

This work deals with the presence of cuscuton term in otherwise standard dark energy evolution under usual FLRW background. We disclose a first-order framework similar to Hamilton-Jacobi formalism, which helps us solve equations motion and find analytical solutions. explore several possibilities, concentrating mainly on how cuscuton-like contribution works modify cosmic evolution. Some results are current interest since they describe scenarios capable changing evolution, adding or excluding...

Abstract This work deals with the presence of cuscuton term in otherwise standard dark energy evolution under usual FLRW background. We disclose a first-order framework similar to Hamilton-Jacobi formalism, which helps us solve equations motion and find analytical solutions. explore several possibilities, concentrating mainly on how cuscuton-like contribution works modify cosmic evolution. Some results are current interest since they describe scenarios capable changing evolution, adding or...

The cosmic distance duality relation is a milestone of cosmology involving the luminosity and angular diameter distances. Any departure points to new physics or systematic errors in observations, therefore tests are extremely important build consistent cosmological framework. Here, two proposed based on galaxy clusters observations (angular gas mass fraction) $H(z)$ measurements. By applying Gaussian Processes, non-parametric method, we able derive constraints departures where no evidence...

Abstract We investigate theoretical and observational aspects of a warm inflation scenario driven by the $$\beta $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>β</mml:mi> </mml:math> -exponential potential, which generalizes well-known power law inflation. In such scenario, decay inflaton field into radiation happens during inflationary phase. our study, we consider dissipation coefficient ( $$\varGamma <mml:mi>Γ</mml:mi> ) with cubic dependence on temperature T...

The current available CMB data show an anomalously low value of the temperature fluctuations at large angular scales (l < 40). This lack power is not explained by minimal LCDM model, and one possible mechanisms explored in literature to address this problem presence features primordial spectrum (PPS) motivated early universe physics. In paper, we analyse a set cutoff inflationary PPS models using Bayesian model comparison approach light latest Cosmic Microwave Background (CMB) from Planck...

Nowadays, thanks to the improved precision of cosmological data, it has been possible search for deviation from general relativity theory with tests on large cosmic scales. Particularly, there is a class modified gravity theories that breaks Einstein equivalence principle (EEP) in electromagnetic sector, generating variations fine structure constant, violations distance duality relation and evolution law microwave background (CMB) radiation. In recent papers, this tested angular diameter...

We investigate the observational viability of a class $\alpha$-attractors inflationary models in light most recent Cosmic Microwave Background (CMB) and Large-Scale Structure (LSS) data. By considering double-well potential we perform slow-roll analysis to study behavior this models, which is continuous interpolation between chaotic inflation for large values $\alpha$ universal attractor, i.e., $n_s=1- 2/N$ $r=\alpha 12/N^2$ small $\alpha$, where $n_s$ scalar spectral index, $r$...

Abstract The β -exponential inflation is driven by a class of primordial potentials, derived in the framework braneworld scenarios, that generalizes well-known power law inflation. In this paper we update previous constraints on minimal coupled model [1] and extend results also deriving equations for non-minimal scenario. predictions both models are tested light latest temperature polarization maps Cosmic Microwave Background clustering data. We compare these with standard ΛCDM cosmology...

We nonparametrically reconstruct the late-time expansion history in light of latest Baryon Acoustic Oscillation (BAO) measurements from DESI combined with various Type Ia Supernovae (SNeIa) catalogs, using interpolation through piece-wise natural cubic splines, and a reconstruction procedure based on Gaussian Processes (GPs). Applied to BAO PantheonPlus SNeIa data, both methods indicate that deviations reference $\Lambda$CDM model $z \lesssim 2$ unnormalized rate $E(z)$ are constrained be...

Abstract We investigate the early universe evolution in context of brane inflation driven by a supergravity-inspired arctan potential. performed slow-roll and semi-analytical reheating analyses obtained constraints on inflationary parameters agreement with Planck 2018 data. also employed Markov Chain Monte Carlo analysis to perform parameter estimation cosmological parameters, obtaining results good currently available cosmic microwave background baryon acoustic oscillation This work...

We evaluate the quantum backreaction due to a gauge field coupled pseudo scalar driving slow-roll inflationary stage, so-called axion inflation. The is evaluated for first time using invariant approach, going second order in perturbation theory and taking consideration inflaton fluctuations as well perturbations of metric. Within our invariant, but observer-dependent we naturally consider physical observer one comoving with field. Considering effective expansion rate consequent fields...