Artículo
Calzetta, E.; Verdaguer, E. "Noise induced transitions in semiclassical cosmology" (1999) Physical Review D - Particles, Fields, Gravitation and Cosmology. 59(8):1-24
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Abstract:
A semiclassical cosmological model is considered which consists of a closed Friedmann-Robertson-Walker spacetime in the presence of a cosmological constant, which mimics the effect of an inflaton field, and a massless, non-conformally coupled quantum scalar field. We show that the back-reaction of the quantum field, which consists basically of a nonlocal term due to gravitational particle creation and a noise term induced by the quantum fluctuations of the field, are able to drive the cosmological scale factor over the barrier of the classical potential so that if the universe starts near a zero scale factor (initial singularity), it can make the transition to an exponentially expanding de Sitter phase. We compute the probability of this transition and it turns out to be comparable with the probability that the universe tunnels from "nothing" into an inflationary stage in quantum cosmology. This suggests that in the presence of matter fields the back-reaction on the spacetime should not be neglected in quantum cosmology. ©1999 The American Physical Society.
Registro:
| Documento: | Artículo |
| Título: | Noise induced transitions in semiclassical cosmology |
| Autor: | Calzetta, E.; Verdaguer, E. |
| Filiación: | Inst. Astronomia y Fis. del Espacio, Departamento de Física, Ciudad Universitaria, 1428 Buenos Aires, Argentina Dept. de Física Fonamental, Inst. de Fis. d'Altes Energies, Universitat de Barcelona, Av. Diagonal 647, E-08028 Barcelona, Spain |
| Año: | 1999 |
| Volumen: | 59 |
| Número: | 8 |
| Página de inicio: | 1 |
| Página de fin: | 24 |
| Título revista: | Physical Review D - Particles, Fields, Gravitation and Cosmology |
| Título revista abreviado: | Phys Rev D Part Fields Gravit Cosmol |
| ISSN: | 05562821 |
| CODEN: | PRVDA |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562821_v59_n8_p1_Calzetta |
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Citas:
---------- APA ----------
Calzetta, E. & Verdaguer, E. (1999) . Noise induced transitions in semiclassical cosmology. Physical Review D - Particles, Fields, Gravitation and Cosmology, 59(8), 1-24.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562821_v59_n8_p1_Calzetta [ ]
---------- CHICAGO ----------
Calzetta, E., Verdaguer, E. "Noise induced transitions in semiclassical cosmology" . Physical Review D - Particles, Fields, Gravitation and Cosmology 59, no. 8 (1999) : 1-24.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562821_v59_n8_p1_Calzetta [ ]
---------- MLA ----------
Calzetta, E., Verdaguer, E. "Noise induced transitions in semiclassical cosmology" . Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 59, no. 8, 1999, pp. 1-24.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562821_v59_n8_p1_Calzetta [ ]
---------- VANCOUVER ----------
Calzetta, E., Verdaguer, E. Noise induced transitions in semiclassical cosmology. Phys Rev D Part Fields Gravit Cosmol. 1999;59(8):1-24.Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562821_v59_n8_p1_Calzetta [ ]
