81 citations · 236 across the 5 of their papers we have counts for
5 papers
On the scalar consistency relation away from slow roll
V. Sreenath, Dhiraj Kumar Hazra, L. Sriramkumar
As is well known, the non-Gaussianity parameter , which is often used to characterize the amplitude of the scalar bi-spectrum, can be expressed completely in terms o…
Primordial power spectrum from Planck
Dhiraj Kumar Hazra, Arman Shafieloo, Tarun Souradeep
Using modified Richardson-Lucy algorithm we reconstruct the primordial power spectrum (PPS) from Planck Cosmic Microwave Background (CMB) temperature anisotropy data. In our analys…
Sharp inflaton potentials and bi-spectra: Effects of smoothening the discontinuity
Jerome Martin, L. Sriramkumar, Dhiraj Kumar Hazra
Sharp shapes in the inflaton potentials often lead to short departures from slow roll which, in turn, result in deviations from scale invariance in the scalar power spectrum. Typic…
Whipped inflation
Dhiraj Kumar Hazra, Arman Shafieloo, George F. Smoot +1
Motivated by the idea that inflation occurs at the GUT symmetry breaking scale, in this paper we construct a new class of large field inflaton potentials where the inflaton starts…
Primordial Non-Gaussianity in the Forest: 3D Bispectrum of Ly-alpha Flux Spectra Along Multiple Lines of Sight
Dhiraj Kumar Hazra, Tapomoy Guha Sarkar
We investigate the possibility of constraining primordial non-Gaussianity using the 3D bispectrum of Ly-alpha forest. The strength of the quadratic non-Gaussian correction to an ot…