In the realm of the Hubble tension—a review of solutions

E Di Valentino, O Mena, S Pan, L Visinelli… - … and Quantum Gravity, 2021‏ - iopscience.iop.org
The simplest ΛCDM model provides a good fit to a large span of cosmological data but
harbors large areas of phenomenology and ignorance. With the improvement of the number …

Selected topics in scalar–tensor theories and beyond

I Quiros - International Journal of Modern Physics D, 2019‏ - World Scientific
Scalar fields have played an important role in the development of the fundamental theories
of physics as well as in other branches of physics such as gravitation and cosmology. For a …

Cosmological solutions and growth index of matter perturbations in gravity

W Khyllep, A Paliathanasis, J Dutta - Physical Review D, 2021‏ - APS
The present work studies one of Einstein's alternative formulations based on the
nonmetricity scalar Q generalized as f (Q) theory. More specifically, we consider the power …

Dark energy in light of the early JWST observations: case for a negative cosmological constant?

SA Adil, U Mukhopadhyay, AA Sen… - Journal of Cosmology …, 2023‏ - iopscience.iop.org
Early data from the James Webb Space Telescope (JWST) has uncovered the existence of a
surprisingly abundant population of very massive galaxies at extremely high redshift, which …

Negative cosmological constant in the dark energy sector: tests from JWST photometric and spectroscopic observations of high-redshift galaxies

N Menci, SA Adil, U Mukhopadhyay… - … of Cosmology and …, 2024‏ - iopscience.iop.org
Early observations with the James Webb Space Telescope (JWST) have revealed the
existence of an unexpectedly large abundance of extremely massive galaxies at redshifts z≳ …

Conservation laws and exact solutions in Brans–Dicke cosmology with a scalar field

A Paliathanasis - General Relativity and Gravitation, 2019‏ - Springer
Scalar–tensor theories have drawn the attention of cosmologist for the past few years
because they can provide mechanism to explain the observable phenomena. Moreover, the …

Generalized Emergent Dark Energy: observational Hubble data constraints and stability analysis

A Hernández-Almada, G Leon, J Magaña… - Monthly Notices of …, 2020‏ - academic.oup.com
Recently, a phenomenologically emergent dark energy (PEDE) model was presented with a
dark energy density evolving as, ie with no degree of freedom. Later on, a generalized …

Revisiting fractional cosmology

B Micolta-Riascos, AD Millano, G Leon, C Erices… - Fractal and …, 2023‏ - mdpi.com
Recently, the research community has been exploring fractional calculus to address
problems related to cosmology; in this approach, the gravitational action integral is altered …

Dynamics of nonlinear interacting dark energy models

A Paliathanasis, S Pan, W Yang - International Journal of Modern …, 2019‏ - World Scientific
We investigate the cosmological dynamics of interacting dark energy models in which the
interaction function is nonlinear in terms of the energy densities. Considering explicitly the …

Revisiting cosmological diffusion models in Unimodular Gravity and the H0 tension

FXL Cedeno, U Nucamendi - Physics of the Dark Universe, 2021‏ - Elsevier
Within the framework of Unimodular Gravity, we consider non-gravitational interactions
between dark matter and dark energy. Particularly, we describe such interactions in the dark …