518 citations · 3.6k across the 129 of their papers we have counts for
9 papers · 2 filters
Neutrino Phenomenology, Dark Energy and Leptogenesis from pseudo-Nambu-Goldstone Bosons
C. T. Hill, I. Mocioiu, E. A. Paschos +1
We consider a model of dynamical neutrino masses via the see-saw mechanism. Nambu-Goldstone bosons (majorons) arise associated with the formation of the heavy right-handed majorana…
Low-Energy Thermal Leptogenesis in an Extended NMSSM Model
Ernest Ma, Narendra Sahu, Utpal Sarkar
Thermal leptogenesis in the canonical seesaw model in supersymmetry suffers from the incompatibility of a generic lower bound on the mass scale of the lightest right-handed neutrin…
CP violation in neutrino mass matrix
Utpal Sarkar, Santosh K. Singh
We constructed rephasing invariant measures of CP violation with elements of the neutrino mass matrix, in the basis in which the charged lepton mass matrix is diagonal. We discuss…
Leptogenesis and low energy CP phases with two heavy neutrinos
Kaushik Bhattacharya, Narendra Sahu, Utpal Sarkar +1
An attractive explanation for non-zero neutrino masses and small matter antimatter asymmetry of the present Universe lies in "leptogenesis". At present the {\it size} of the lepton…
Anomaly for Model Building
Utpal Sarkar
A simple algorithm to calculate the group theory factor entering in anomalies at four and six dimensions for SU(N) and SO(N) groups in terms of the Casimir invariants of their subg…
Leptogenesis bound on neutrino masses in left-right symmetric models with spontaneous D-parity violation
Narendra Sahu, Utpal Sarkar
We study the baryogenesis via leptogenesis in a class of left-right symmetric models, in which -parity is broken spontaneously. We first discuss the consequence of the spontaneo…
Leptogenesis Below the Davidson-Ibarra Bound
Ernest Ma, Narendra Sahu, Utpal Sarkar
The observed baryon asymmetry of the Universe is suitably created in thermal leptogenesis through the out-of-equilibrium decay of , the lightest of the three heavy singlet neu…
Connecting Dark Energy to Neutrinos with an Observable Higgs Triplet
Ernest Ma, Utpal Sarkar
To connect the scalar field (acceleron) responsible for dark energy to neutrinos, the usual strategy is to add unnaturally light neutral singlet fermions (right-handed neutrinos) t…
See-saw fermion masses in an SO(10) GUT
Kaushik Bhattacharya, C. R. Das, Bipin R. Desai +2
In this work we study an SO(10) GUT model with minimum Higgs representations belonging only to the 210 and 16 dimensional representations of SO(10). We add a singlet fermion S in a…