41 citations · 67 across the 9 of their papers we have counts for
9 papers
Gravitational wave propagation through viscous matter
Vishnu Kakkat, Ulrich K. Beckering Vinckers, Nigel T. Bishop +4
It has been known that gravitational waves (GWs) transfer energy to viscous matter through which they propagate, but the effect is too weak to be astrophysically significant. Using…
Spherically symmetric black holes in Gravity from Entropy and spontaneous emission
Udaykrishna Thattarampilly, Yunlong Zheng, Vishnu Kakkat
We investigate static and dynamical spherically symmetric black hole solutions within the Gravity from Entropy (GfE) framework. We derive and solve the modified vacuum field equati…
Inflation from entropy
Udaykrishna Thattarampilly, Yunlong Zheng
We investigate cosmological solutions for the modified gravity theory obtained from quantum relative entropy between the metric of spacetime and the metric induced by the geometry…
Probe of spatial geometry from scalar induced gravitational waves
Utkarsh Kumar, Udaykrishna Thattarampilly, Pankaj Chaturvedi
We investigate a novel probe of spatial geometry of the Universe through the observation of gravitational waves (GWs) induced by first order curvature perturbations. The existence…
Gravitational-wave background in bouncing models from semi-classical, quantum and string gravity
Ido Ben-Dayan, Gianluca Calcagni, Maurizio Gasperini +4
We study the primordial spectra and the gravitational-wave background (GWB) of three models of semi-classical, quantum or string gravity where the big bang is replaced by a bounce…
Rotating black hole solutions for gravity and Newman Janis Algorithm
Pankaj Chaturvedi, Utkarsh Kumar, Udaykrishna Thattarampilly +1
We show that the -gravity theories with constant Ricci scalar in the Jordan/Einstein frame can be described by Einstein or Einstein-Maxwell gravity with a cosmological term a…
Requiem to "Proof of Inflation" or Sourced Fluctuations in a Non-Singular Bounce
Ido Ben-Dayan, Udaykrishna Thattarampilly
Popular wisdom suggests that measuring the tensor to scalar ratio on CMB scales is a "proof of inflation" since one generic prediction is a scale-invariant tensor spectrum whil…
Probing The Early Universe Cosmology With NANOGrav: Possibilities and Limitations
Ido Ben-Dayan, Utkarsh Kumar, Udaykrishna Thattarampilly +1
A stochastic gravitational wave background is a prediction of a number of astrophysical and cosmological phenomena including early Universe Cosmology. Recently, the NANOGrav Collab…
Sourced fluctuations in generic slow contraction
Michał Artymowski, Ido Ben-Dayan, Udaykrishna Thattarampilly
We introduce a set of generic conditions for the slow contracting Universe and for a narrowed-down category of models called fast-roll models. We present general conditions for sup…