Novel vacuum conditions in inflationary collapse models
Within the framework of inflationary models that incorporate a spontaneous reduction of the wave function for the emergence of the seeds of cosmic structure, we study the effects on the primordial scalar power spectrum by choosing a novel initial quantum state that characterizes the perturbations of...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Elsevier
2017-11-01
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| Series: | Physics Letters B |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269317307979 |
| _version_ | 1818443382239789056 |
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| author | Gabriel R. Bengochea Gabriel León |
| author_facet | Gabriel R. Bengochea Gabriel León |
| author_sort | Gabriel R. Bengochea |
| collection | DOAJ |
| description | Within the framework of inflationary models that incorporate a spontaneous reduction of the wave function for the emergence of the seeds of cosmic structure, we study the effects on the primordial scalar power spectrum by choosing a novel initial quantum state that characterizes the perturbations of the inflaton. Specifically, we investigate under which conditions one can recover an essentially scale free spectrum of primordial inhomogeneities when the standard Bunch–Davies vacuum is replaced by another one that minimizes the renormalized stress–energy tensor via a Hadamard procedure. We think that this new prescription for selecting the vacuum state is better suited for the self-induced collapse proposal than the traditional one in the semiclassical gravity picture. We show that the parametrization for the time of collapse, considered in previous works, is maintained. Also, we obtain an angular spectrum for the CMB temperature anisotropies consistent with the one that best fits the observational data. Therefore, we conclude that the collapse mechanism might be of a more fundamental character than previously suspected. |
| first_indexed | 2024-12-14T18:59:09Z |
| format | Article |
| id | doaj.art-6857c1b108084370ac525788481fb441 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 1873-2445 |
| language | English |
| last_indexed | 2024-12-14T18:59:09Z |
| publishDate | 2017-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-6857c1b108084370ac525788481fb4412022-12-21T22:51:00ZengElsevierPhysics Letters B0370-26931873-24452017-11-01774C33835010.1016/j.physletb.2017.09.085Novel vacuum conditions in inflationary collapse modelsGabriel R. Bengochea0Gabriel León1Instituto de Astronomía y Física del Espacio (IAFE), CONICET – Universidad de Buenos Aires, (1428) Buenos Aires, ArgentinaGrupo de Astrofísica, Relatividad y Cosmología, Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque S/N (1900) La Plata, ArgentinaWithin the framework of inflationary models that incorporate a spontaneous reduction of the wave function for the emergence of the seeds of cosmic structure, we study the effects on the primordial scalar power spectrum by choosing a novel initial quantum state that characterizes the perturbations of the inflaton. Specifically, we investigate under which conditions one can recover an essentially scale free spectrum of primordial inhomogeneities when the standard Bunch–Davies vacuum is replaced by another one that minimizes the renormalized stress–energy tensor via a Hadamard procedure. We think that this new prescription for selecting the vacuum state is better suited for the self-induced collapse proposal than the traditional one in the semiclassical gravity picture. We show that the parametrization for the time of collapse, considered in previous works, is maintained. Also, we obtain an angular spectrum for the CMB temperature anisotropies consistent with the one that best fits the observational data. Therefore, we conclude that the collapse mechanism might be of a more fundamental character than previously suspected.http://www.sciencedirect.com/science/article/pii/S0370269317307979CosmologyInflationQuantum cosmology |
| spellingShingle | Gabriel R. Bengochea Gabriel León Novel vacuum conditions in inflationary collapse models Physics Letters B Cosmology Inflation Quantum cosmology |
| title | Novel vacuum conditions in inflationary collapse models |
| title_full | Novel vacuum conditions in inflationary collapse models |
| title_fullStr | Novel vacuum conditions in inflationary collapse models |
| title_full_unstemmed | Novel vacuum conditions in inflationary collapse models |
| title_short | Novel vacuum conditions in inflationary collapse models |
| title_sort | novel vacuum conditions in inflationary collapse models |
| topic | Cosmology Inflation Quantum cosmology |
| url | http://www.sciencedirect.com/science/article/pii/S0370269317307979 |
| work_keys_str_mv | AT gabrielrbengochea novelvacuumconditionsininflationarycollapsemodels AT gabrielleon novelvacuumconditionsininflationarycollapsemodels |