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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…
Nonlocal theories of gravity: the flat space propagator
Tirthabir Biswas, Tomi Koivisto, Anupam Mazumdar
It was recently found that there are classes of nonlocal gravity theories that are free of ghosts and singularities in their Newtonian limit [PRL, 108 (2012), 031101]. In these pro…