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Conformal Invariance and the Four Point Scalar Correlator in Slow-Roll Inflation
Archisman Ghosh, Nilay Kundu, Suvrat Raju +1
We calculate the four point correlation function for scalar perturbations in the canonical model of slow-roll inflation. We work in the leading slow-roll approximation where the ca…
Dissipative Nonlinear Dynamics in Holography
Pallab Basu, Archisman Ghosh
We look at the response of a nonlinearly coupled scalar field in an asymptotically AdS black brane geometry and find a behavior very similar to that of known dissipative nonlinear…
Confining Backgrounds and Quantum Chaos in Holography
Pallab Basu, Archisman Ghosh
Classical world-sheet string theory has recently been shown to be nonintegrable and chaotic in various confining string theory backgrounds -- the AdS soliton background in particul…
Chaos around Holographic Regge Trajectories
Pallab Basu, Diptarka Das, Archisman Ghosh +1
Using methods of Hamiltonian dynamical systems, we show analytically that a dynamical system connected to the classical spinning string solution holographically dual to the princip…
Integrability Lost
Pallab Basu, Diptarka Das, Archisman Ghosh
It is known that classical string dynamics in pure AdS_5\times S^5 is integrable and plays an important role in solvability. This is a deep and central issue in holography. Here we…
On Dumb Holes and their Gravity Duals
Sumit R. Das, Archisman Ghosh, Jae-Hyuk Oh +1
Inhomogeneous fluid flows which become supersonic are known to produce acoustic analogs of ergoregions and horizons. This leads to Hawking-like radiation of phonons with a temperat…