731 citations · 3.7k across the 53 of their papers we have counts for
6 papers · 1 filter
Can Inflation solve the Hierarchy Problem?
Tirthabir Biswas, Alessio Notari
Inflation with tunneling from a false to a true vacuum becomes viable in the presence of a scalar field that slows down the initial de Sitter phase. As a by-product this field also…
Bouncing Universes in String-inspired Gravity
Tirthabir Biswas, Anupam Mazumdar, Warren Siegel
We consider the effects on cosmology of higher-derivative modifications of (effective) gravity that make it asymptotically free without introducing ghosts. The weakening of gravity…
Current Acceleration from Dilaton and Stringy Cold Dark Matter
Tirthabir Biswas, Robert Brandenberger, Anupam Mazumdar +1
We argue that string theory has all the ingredients to provide us with candidates for the cold dark matter and explain the current acceleration of our Universe. In any generic stri…
Dynamical CP Violation in the Early Universe and Leptogenesis
K. R. S. Balaji, Tirthabir Biswas, Robert H. Brandenberger +1
In a recent publication, we suggested a mechanism for obtaining dynamical CP violation in the early Universe based on the out-of-equilibrium evolution of complex scalar fields. In…
Moduli Stabilization in Brane Gas Cosmology with Superpotentials
Aaron Berndsen, Tirthabir Biswas, James M. Cline
In the context of brane gas cosmology in superstring theory, we show why it is impossible to simultaneously stabilize the dilaton and the radion with a general gas of strings (incl…
Coupled Inflation and Brane Gases
Tirthabir Biswas, Robert Brandenberger, Damien A. Easson +1
We study an effective four-dimensional theory with an action with two scalar fields minimally coupled to gravity, and with a matter action which couples to the two scalar fields vi…