299 citations · 309 across the 11 of their papers we have counts for
14 papers
Quintaverse-Phantiverse Cosmologies in Gravity: a Non-coincident Geometrical Origin of Cosmic Acceleration
Hamid Shabani, Avik De
We investigate the asymptotic dark energy sectors of a quadratic form of Lagrangian. We reformulate the original equations of motion to obtain the equivalent dynamical sys…
Observational constraints on scalar-nonmetricity cosmology: the role of the connection
Ghulam Murtaza, Avik De, Emmanuel N. Saridakis
Scalar-nonmetricity gravity provides a natural scalar-tensor extension of symmetric teleparallel gravity, with the gravitational interaction encoded in nonmetricity. A distinctive…
The role of anisotropy in gravity: insights from cosmological observations
Ghulam Murtaza, Nandan Roy, Avik De
We investigate the cosmological dynamics of Bianchi-I spacetime in symmetric teleparallel gravity through a dynamical system approach to analyse observational constraints. B…
Perturbation Dynamics and Structure Formation in Extended Proca-Nuevo Gravity
N. S. Kavya, Avik De, Tee-How Loo
A comprehensive analysis of cosmological perturbations and structure formation is presented for the Extended Proca-Nuevo (EPN) framework, a vector-tensor extension of General Relat…
Scalar field coupled to boundary in non-metricity: a new avenue towards dark energy
Ghulam Murtaza, Avik De, Tee-How Loo +1
While conformal transformations in metric scalar-tensor theories recover General Relativity, this feature is notably absent in standard non-metricity-based theories. We demonstrate…
Density contrast in the scalar-tensor extension of non-metricity gravity
Ganesh Subramaniam, Avik De, Jackson Levi Said
We present a novel derivation of scalar cosmological perturbations in the scalar-tensor extension of non-metricity gravity, where the non-metricity scalar is non-minimally coup…
Scalar-Tensor Symmetric Teleparallel Gravity: Reconstruct the Cosmological History with a Steep Potential
Ghulam Murtaza, Avik De, Andronikos Paliathanasis
Within the framework of scalar-non-metricity gravity, we introduce a steep potential together with a power-law coupling function and investigate whether the acceleration phases of…
Cosmological Scenarios in gravity with a dynamical degree of freedom
Hamid Shabani, Avik De
The theory, which extends symmetric teleparallel gravity by including the boundary term in addition to the non-metricity scalar , provides a unifying framework that…
Exact cosmological solutions in non-coincidence -theory
Avik De, Andronikos Paliathanasis
We study exact cosmological solutions in gravity formulated beyond the coincident gauge, focusing on the non-coincident connection branch . Using a minisuperspace appro…
Role of the Dynamic Degree of Freedom in Scalar-Tensor Non-Metricity Gravity with Curved FLRW Geometry
Ghulam Murtaza, Avik De, Andronikos Paliathanasis
We investigate a non-minimally coupled scalar field theory within the framework of scalar-tensor non-metricity gravity, focusing on spatially curved FLRW spacetimes. Employing the…
Can an Extra Degree of Freedom in Scalar-Tensor Non-Metricity Gravity Account for the Evolution of the Universe?
Ghulam Murtaza, Avik De, Andronikos Paliathanasis +1
We investigate whether the extra scalar degree of freedom that arises in the second connection class of scalar-tensor non-metricity gravity can accurately replicate and potentially…
Phase-space analysis of an anisotropic universe in gravity
Ghulam Murtaza, Avik De, Tee-How Loo +2
In this study, we analyze the anisotropic universe in gravity theory. To achieve this, we consider three specific models of gravity and rewrite the equations of m…
A generic dynamical system formulation for Bianchi-I cosmology with isotropic fluid in gravity
Ghulam Murtaza, Saikat Chakraborty, Avik De
In this article, we present a generic dynamical system formulation for Bianchi-I cosmology in the presence of an isotropic fluid within the coincident gauge connection branch and o…
The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
Eleonora Di Valentino, Jackson Levi Said, Adam Riess +533
The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades.…