4 papers
Inflationary Gravitational Wave Spectral Shapes as test for Low-Scale Leptogenesis
Zafri A. Borboruah, Anish Ghoshal, Lekhika Malhotra +1
We study non-thermal resonant leptogenesis in a general setting where a heavy majoron decays to right-handed neutrinos (RHNs) whose further out-of-equilibrium decay generates…
Relativistic quantum mechanics and quantum field theory
Urjit A. Yajnik
Relativistic quantum mechanics can be considered to have begun with a search for wave equations corresponding to each intrinsic spin. However, relativistic quantum physics differs…
Left-Right Symmetry Breaking and Gravitational Waves : A Tale of Two Phase Transitions
Z. A. Borboruah, U. A. Yajnik
We study possible ways gravitational waves (GW) are sourced in a theory with minimal left-right symmetry breaking. Generically first order phase transitions (FOPT) lead to gravitat…
Gravitational production of massive scalars in the context of inflation
Urjit A. Yajnik
We set up a formalism for calculating the energy density generated in a quantized massive scalar field in the course of the drastic change in spacetime geometry at the end of the i…