731 citations · 3.7k across the 53 of their papers we have counts for
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Generalized ghost-free quadratic curvature gravity
Tirthabir Biswas, Aindriú Conroy, Alexey S. Koshelev +1
In this paper we study the most general covariant action of gravity up to terms that are quadratic in curvature. In particular this includes non-local, infinite derivative theories…
Before the Bang
Tirthabir Biswas
While inflation has been an extremely successful cosmological paradigm, almost certainly something have had to have happened before it began. Can the pre-inflationary phase be of a…
Numerically Investigating the Emergent Cyclic Inflation Scenario
William Duhe, Tirthabir Biswas
We provide a comprehensive numerical study of the Emergent Cyclic Inflation scenario. This is a scenario where instead of traditional monotonic slow roll inflation, the universe ex…
Super-Inflation, Non-Singular Bounce, and Low Multipoles
Tirthabir Biswas, Anupam Mazumdar
In this paper we present a simple argument that shows a non-singular bouncing cosmology naturally yields an era of super-inflation which can precede the phase of normal potential d…
Cosmological perturbations from statistical thermal fluctuations
Tirthabir Biswas, Robert Brandenberger, Tomi Koivisto +1
Cosmological perturbations due to statistical thermal fluctuations in a single fluid characterized by an arbitrary equation of state are computed. Formulas to predict the scalar an…
Phase transitions during Cyclic-Inflation and Non-gaussianity
Tirthabir Biswas, Tomi Koivisto, Anupam Mazumdar
Typically cold inflation with positive vacuum energy density dilutes all matter except the quan- tum fluctuations which are stretched outside the Hubble patch during inflation. How…