2014/12/22 by Marco de Cesare, M. de Cesare, de Cesare, M. +4 · 2 citations
Mathematics · Physics and Astronomy · #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #Stochastic processes and statistical mechanics #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.48550/arxiv.1412.7077
24 pages, rev tex, two pdf figures incorporated; clarifying remarks added in sections IIA,B on the nature of the string-inspired solution with Kalb-Ramond torsion, as well as in section VA, on the thermal evolution of the torsion after decoupling of right-handed Majorana fermions. No effect on conclusions. Some references were also added
openalex publication_date 2014/12/22 · arxiv created 2015/02/03 · arxiv updated 2015/02/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The effect of torsion in theories of quantum gravity is known to be well described by an axion-like field which couples to matter as well as to gravitation and radiation gauge fields. In this note we consider a particular kind of torsion, arising from the Kalb-Ramond antisymmetric tensor field that appears in the gravitational multiplet of string theory. We investigate the implications for leptogenesis. It is shown that leptogenesis can occur even at tree-level and with only one generation of right-handed Majorana neutrinos, due to CP and CPT violation introduced by the background geometry.