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View article: A singularity free classical theory of gravity
A singularity free classical theory of gravity Open
We present a classical theory of gravity, which is singularity free at short distances and reduces to General Relativity at large distances. We discuss its implications.
View article: Varying Newton's constant: a cure for gravitational maladies?
Varying Newton's constant: a cure for gravitational maladies? Open
We show that a slowly varying Newton's constant, consistent with existing bounds, can potentially explain a host of observations pertaining to gravitational effects or phenomena across distances spanning from planetary to the cosmological,…
View article: Gravitational lensing and missing mass
Gravitational lensing and missing mass Open
The mass of an astrophysical object can be estimated by the amount of gravitational lensing of another object that it causes. To arrive at the estimation however, one assumes the validity of the inverse square law of gravity, or equivalent…
View article: Gravitational lensing and missing mass
Gravitational lensing and missing mass Open
The mass of an astrophysical object can be estimated by the amount of gravitational lensing of another object that it causes. To arrive at the estimation however, one assumes the validity of the inverse square law of gravity, or equivalent…
View article: Emergent gravity at all scales
Emergent gravity at all scales Open
It has recently been shown that any observed potential can in principle be generated via quantum mechanics using a suitable wavefunction. In this work, we consider the concrete example of the gravitational potential experienced by a test p…
View article: Dark matter or strong gravity?
Dark matter or strong gravity? Open
We show that Newton's gravitational potential, augmented by a logarithmic term, partly or wholly mitigates the need for dark matter. As a bonus, it also explains why MOND seems to work at galactic scales. We speculate on the origin of such…
View article: A Unified Cosmological Dark Sector from a Bose-Einstein Condensate
A Unified Cosmological Dark Sector from a Bose-Einstein Condensate Open
We examine the viability of cosmological solution(s) describing a unified picture of the dark side of the universe from a Bose-Einstein condensate (BEC) of light bosons. The energy density of the BEC, together with its quantum potential, c…
View article: Imprints of interacting dark energy on cosmological perturbations
Imprints of interacting dark energy on cosmological perturbations Open
We investigate the characteristic modifications in the evolving cosmological perturbations when dark energy interacts with dust-like matter, causing the latter’s background energy density fall off with time faster than usual. Focusing in p…
View article: Dynamical system analysis of interacting dark energy-matter scenarios at the linearized inhomogeneous level
Dynamical system analysis of interacting dark energy-matter scenarios at the linearized inhomogeneous level Open
We carry out the dynamical system analysis of interacting dark energy-matter scenarios by examining the critical points and stability for not just the background level cosmological evolution, but at the level of the linear density perturba…
View article: On the quantum origin of potentials
On the quantum origin of potentials Open
The dynamics of a quantum particle is governed by its wavefunction, which in turn is determined by the classical potential to which it is subjected. However the wavefunction itself induces a quantum potential, the particle `sees' the sum o…
View article: Emergent gravity and the quantum
Emergent gravity and the quantum Open
In this essay, we show that if one starts with a universe with some matter and a cosmological constant, then quantum mechanics naturally induces an attractive gravitational potential and an effective Newton’s coupling. Thus, gravity is an …
View article: Growth of Matter Perturbations in an Interacting Dark Energy Scenario Emerging from Metric-Scalar-Torsion Couplings
Growth of Matter Perturbations in an Interacting Dark Energy Scenario Emerging from Metric-Scalar-Torsion Couplings Open
We study the growth of linear matter density perturbations in a modified gravity approach of scalar field couplings with metric and torsion. In the equivalent scalar-tensor formulation, the matter fields in the Einstein frame interact as u…
View article: On the Quantum Origin of a Dark Universe
On the Quantum Origin of a Dark Universe Open
It has been shown beyond reasonable doubt that the majority (about 95%) of the total energy budget of the universe is given by dark components, namely Dark Matter and Dark Energy. What constitutes these components remains to be satisfactor…
View article: On the Quantum Origin of a Dark Universe
On the Quantum Origin of a Dark Universe Open
It has been shown beyond reasonable doubt that the majority (about 95%) of the total energy budget of the universe is given by the dark components, namely Dark Matter and Dark Energy. What constitutes these components remains to be satisfa…
View article: Growth of Matter Perturbations in an Interacting Dark Energy Scenario Emerging from Metric-Scalar-Torsion Couplings
Growth of Matter Perturbations in an Interacting Dark Energy Scenario Emerging from Metric-Scalar-Torsion Couplings Open
We study the growth of linear matter density perturbations in a modified gravity approach of scalar field couplings with metric and torsion. In the equivalent scalar-tensor formulation, the matter fields in the Einstein frame interact as u…
View article: Dynamical system analysis of dark energy models in scalar coupled Metric-Torsion theories
Dynamical system analysis of dark energy models in scalar coupled Metric-Torsion theories Open
We study the phase-space dynamics of cosmological models in the theoretical formulations of nonminimal metric-torsion couplings with a scalar field, and investigate in particular the critical points (CPs) which yield stable solutions exhib…
View article: Phase Plane Analysis of Metric-Scalar Torsion Model for Interacting Dark Energy
Phase Plane Analysis of Metric-Scalar Torsion Model for Interacting Dark Energy Open
We study the phase space dynamics of the non-minimally coupled Metric-Scalar-Torsion model in both Jordan and Einstein frames. We specifically check for the existence of critical points which yield stable solutions representing the current…