We study the definition of the Feynman propagator for a free conformally coupled scalar field on a Robertson-Walker background, as the continuation to physical space of the single propagator of a Riemannian manifold. If the space-time has a cosmological singularity, a boundary condition is proposed that leads to the definition of particle modes at the singularity. © 1984 The American Physical Society.
Documento: | Artículo |
Título: | Riemannian approach and cosmological singularity |
Autor: | Calzetta, E.; Castagnino, M. |
Filiación: | Instituto de Astronomía Y Física del Espacio, Casilla de Correos 67-Sucursal, 28-1428 Buenos Aires, Argentina Instituto de Física de Rosario, Consejo Nacional de Investigaciones Cientificas Y Tecnicas-Universidad Nacional de Rosario, Avenida Pellegrini 250-2000 Rosario, Argentina |
Año: | 1984 |
Volumen: | 29 |
Número: | 8 |
Página de inicio: | 1609 |
Página de fin: | 1617 |
DOI: | http://dx.doi.org/10.1103/PhysRevD.29.1609 |
Título revista: | Physical Review D |
ISSN: | 05562821 |
Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562821_v29_n8_p1609_Calzetta |