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Higgs vacuum stability and inflationary dynamics after BICEP2 and PLANCK dust polarisation data
Kaushik Bhattacharya, Joydeep Chakrabortty, Suratna Das +1
If the recent detection of mode polarization of the Cosmic Microwave Background by BICEP2 observations, withstand the test of time after the release of recent PLANCK dust polar…
Effect of Lee-Wick thermodynamics in the cosmology of the early universe
Kaushik Bhattacharya, Suratna Das
The Lee-Wick theories require unusual Lee-Wick (LW) partners to the standard model (SM) particles. The excitations of the unusual fields may have indefinite norms in the Hilbert sp…
A toy model based analysis on the effect of the Lee-Wick partners in the evolution of the early universe
Kaushik Bhattacharya, Suratna Das
In the present article the thermodynamic results of the Lee-Wick partner infested universe have been applied in a toy model where there is one Lee-Wick partner to each of the stand…
Thermodynamics of the Lee-Wick partners: An alternative approach
Kaushik Bhattacharya, Suratna Das
It was pointed out some time ago that there can be two variations in which the divergences of a quantum field theory can be tamed using the ideas presented by Lee and Wick. In one…
Thermodynamics of the Pauli oscillators and Lee-Wick partners of the Standard Model particles
Kaushik Bhattacharya, Suratna Das
The present article is about the statistical mechanics of non-trivial field configurations. The non-trivial fields arise from the negative sign of the commutators and the anticommu…
The electric charge and magnetic moment of neutral fundamental particles
Kaushik Bhattacharya
The article focuses on the issue of the two definitions of charge, mainly the gauge charge and the effective charge of fundamental particles. Most textbooks on classical electromag…
Neutrino absorption by W production in the presence of a magnetic field
Kaushik Bhattacharya, Sarira Sahu
In this work we calculate the decay rate of the electron type neutrinos into bosons and electrons in presence of an external uniform magnetic field. The decay rate is calculate…
Neutrino self-energy in a magnetized charge-symmetric medium
Alberto Bravo Garcia, Kaushik Bhattacharya, Sarira Sahu
In this talk we present the calculation of the neutrino self-energy in presence of a magnetized medium. The magnetized medium consists of electrons, positrons, neutrinos and a unif…
The neutrino self-energy in a magnetized medium
Alberto Bravo Garcia, Kaushik Bhattacharya, Sarira Sahu
In this work we calculate the neutrino self-energy in presence of a magnetized medium. The magnetized medium consists of electrons, positrons, neutrinos and a uniform classical mag…
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…
Decay of Spin-One Particle into Two Photons in Presence of Uniform External Magnetic Field
Dilip Angom, Kaushik Bhattacharya, Saurabh D. Rindani
Yang's theorem states that an initial J=1 state cannot decay into two photons. Because of this result some reactions relating to elementary particles or atomic transitions can be r…
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…
Gauge invariance of elementary particle processes taking place in presence of a background magnetic field
Kaushik Bhattacharya
Elementary particle scatterings and decays in presence of a background magnetic field are very common in physics, specially after the observation that the core of the neutron stars…
Temperature of the inflaton and duration of inflation from WMAP data
Kaushik Bhattacharya, Subhendra Mohanty, Raghavan Rangarajan
If the initial state of the inflaton field is taken to have a thermal distribution instead of the conventional zero particle vacuum state then the curvature power spectrum gets mod…
The Axialvector-Vector Amplitude and Neutrino Effective Charge in a Magnetized Medium
Kaushik Bhattacharya, Avijit K. Ganguly
To one loop the effective neutrino photon interaction takes place through the vector-vector type and the axialvector-vector type amplitude. In this work we explicitly write down th…
Neutrinos and magnetic fields: a short review
Kaushik Bhattacharya, Palash B. Pal
Neutrinos have no electric charge, but a magnetic field can indirectly affect neutrino properties and interactions through its effect on charged particles. After a brief field-theo…
Neutrino Photon Interaction in a Magnetized Medium II
Kaushik Bhattacharya, Avijit K. Ganguly
In the presence of a thermal medium or an external electro-magnetic field, neutrinos can interact with photon, mediated by the corresponding charged leptons (real or virtual). The…
Inverse beta-decay of arbitrarily polarized neutrons in a magnetic field
Kaushik Bhattacharya, Palash B. Pal
We calculate the cross section of the inverse beta decay process, , in a background magnetic field which is much smaller than . Using exact solutions of the…
Effective Neutrino Photon Interaction in a Magnetized Medium
Kaushik Bhattacharya, Avijit K. Ganguly, Sushan Konar
Neutrino-photon processes, forbidden in vacuum, can take place in presence of a thermal medium or an external electro-magnetic field, mediated by the corresponding charged leptons…
Neutrino scattering in strong magnetic fields
Kaushik Bhattacharya, Palash B. Pal
We show that neutrino cross sections are direction dependent in a background magnetic field.
Inverse beta-decay in magnetic fields
Kaushik Bhattacharya, Palash B. Pal
We calculate the cross section of the inverse beta decay process, , in a magnetic field which is much smaller than . Using exact solutions of the Dirac equat…