On the creation of spin 1/2 particles and adiabatic renormalization in FLRW spacetimes

by Dr Suman Ghosh (S. N. Bose National Centre for Basic Sciences, Kolkata.)

Tuesday 14 Apr 2015, 16:00 → 17:00 Asia/Kolkata

DAA Seminar A269 (TIFR)

Within the framework of adiabatic regularization scheme, developed by Parker & Fulling, we have computed particle number density and renormalized stress energy tensor of spin 1/2 particles. In the process, we have extended the approach of Zeldovich & Starobinskii (n-wave regularisation method), introduced for scalar fields, to spin-1/2 fields in FLRW background, using appropriate WKB ansatz for the adiabatic expansion for field modes. The conformal and axial anomalies thus found are in exact agreement with those obtained from other renormalization method. This work gives us an alternative to [Phys. Rev. D 88, 061501 (2013)] as an appropriate extension of adiabatic renormalization scheme, originally introduced for scalar fields, applicable to fermions.