Photo of Amitabha Lahiri

Amitabha Lahiri

Senior Professor

Department of Astrophysics and High Energy Physics

+91-33-2335 5706


This is my page, especially made for HSF-India, to highlight the areas of my research which have some overlap with their themes.

I am a theoretical physicist, working mainly on quantum field theory and general relativity. Lately I have been interested in particle physics phenomenology as well, particularly processes involving fermion-fermion scattering.

It has been known for many years that the dynamics of fermions on curved spacetime naturally induces a four-fermion interaction. This happens because in addition to gravity, fermions couple to a field called spacetime torsion. This is a non-dynamical field which can be integrated out, leaving behind a four-fermion interaction term.

Recently I realized that the fermion-torsion coupling is generically chiral, leading to four-fermion interactions with different coupling constants for left- and right-chiral components of different fermions. (Alternatively, different for vector and axial currents in current-current interactions.) All of these coupling constants, of mass dimension -1, are unknown and cannot be determined from theoretical considerations. They will affect all processes which involve fermion-fermion interactions, including neutrino oscillations in matter and electron-nucleon scattering, two things I am currently looking at.

My interest in HSF (or HSF-India) is to connect with people who may be interested in computing the effect of these four-fermion interactions in different processes, in accelerators and other experiments, and comparing them with experimental results.

Publications Relevant to HSF

1. S. Chakrabarty, A. Lahiri, Geometrical contribution to neutrino mass matrix, Eur. Phys. J. C79 (2019) 697 [arxiv:1904.06036 [hep-ph]].

My publications on INSPIRE-HEP

My profile on Google Scholar

SN Bose Centre flowers
S. N. Bose National Centre for Basic Sciences
JD Block, Sector 3, Salt Lake, West Bengal 700106, INDIA
Ph: +91 33 2335 5706

Page last updated on 12 Feb 2023