GRAVITATIONAL FORM-FACTORS OF THE NEUTRINO

Authors
Citation
Kl. Ng, GRAVITATIONAL FORM-FACTORS OF THE NEUTRINO, Physical review. D. Particles and fields, 47(11), 1993, pp. 5187-5190
Citations number
10
Categorie Soggetti
Physics, Particles & Fields
ISSN journal
05562821
Volume
47
Issue
11
Year of publication
1993
Pages
5187 - 5190
Database
ISI
SICI code
0556-2821(1993)47:11<5187:GFOTN>2.0.ZU;2-Z
Abstract
The gravitational properties of the neutrino are studied in the weak-f ield approximation. By imposing the Hermiticity condition, CPT, and CP invariance on the energy-momentum tensor matrix element, we show that the allowed gravitational form factors for Dirac and Majorana neutrin os are very different. In a CPT- and CP-invariant theory, the energy-m omentum tensor for a Dirac neutrino of the same species is characteriz ed by four gravitational form factors. As a result of CPT invariance, the energy-momentum tensor for a Majorana neutrino of the same species has five form factors. In a CP-invariant theory, if the initial and f inal Majorana neutrinos have the same (opposite) CP parity, then only tensor(pseudotensor)-type transitions are allowed.