11 papers
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 appr…