Seminário - Grupo de Pesquisa Jorge André Swieca
Palestrante: Karl-Henning Rehren (Universität Göttingen - Alemanha)
Título: Helicity decoupling in the massless limit of massive tensor fields
DATA: 22.02.2017 (quarta-feira)
HORÁRIO: 16:00 horas
LOCAL: Sala B-09 - Bloco B, IME-USP
Resumo: Massive local tensor fields of higher spin s are singular when the mass goes to zero. We identify a family of string-local fields on the same Hilbert space that decouple exactly into massless fields of helicity h= ± r, 0≤ r ≤ s, at m=0. This sheds new light on the Weinberg-Witten theorem (nonexistence of a local stress-energy tensor for massless fields with | h | >1), on the vanDam-Veltman-Zakharov discontinuity (coupling of massive gravitons when m -> 0), and on the ″fattening" deformation making a massless field massive. Joint work with B. Schroer and J. Mund.
