Enhanced inflation in the Dirac-Born-Infeld framework
We consider the Einstein equations within the Dirac-Born-Infield (DBI) scenario for a spatially flat Friedmann-Robertson-Walker (FRW) spacetime without a cosmological constant. We derive the inflationary scenario by applying the symmetry transformations which preserve the form of the Friedmann and c...
Guardado en:
| Autores principales: | , , |
|---|---|
| Formato: | JOUR |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_15507998_v83_n6_p_Chimento |
| Aporte de: |
| id |
todo:paper_15507998_v83_n6_p_Chimento |
|---|---|
| record_format |
dspace |
| spelling |
todo:paper_15507998_v83_n6_p_Chimento2023-10-03T16:24:27Z Enhanced inflation in the Dirac-Born-Infeld framework Chimento, L.P. Lazkoz, R. Richarte, M.G. We consider the Einstein equations within the Dirac-Born-Infield (DBI) scenario for a spatially flat Friedmann-Robertson-Walker (FRW) spacetime without a cosmological constant. We derive the inflationary scenario by applying the symmetry transformations which preserve the form of the Friedmann and conservation equations. These form invariance transformations generate a symmetry group parametrized by the Lorentz factor γ. We explicitly obtain an inflationary scenario by the cooperative effect of adding energy density into the Friedmann equation. For the case of a constant Lorentz factor, and under the slow roll assumption, we find the transformation rules for the scalar and tensor power spectra of perturbations as well as their ratio under the action of the form invariance symmetry group. Within this case and due to its relevance for the inflationary paradigm, we find the general solution of the dynamical equations for a DBI field driven by an exponential potential and show a broad set of inflationary solutions. The general solution can be split into three subsets and all these behave asymptotically as a power-law solution at early and at late times. © 2011 American Physical Society. Fil:Chimento, L.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Richarte, M.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_15507998_v83_n6_p_Chimento |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| description |
We consider the Einstein equations within the Dirac-Born-Infield (DBI) scenario for a spatially flat Friedmann-Robertson-Walker (FRW) spacetime without a cosmological constant. We derive the inflationary scenario by applying the symmetry transformations which preserve the form of the Friedmann and conservation equations. These form invariance transformations generate a symmetry group parametrized by the Lorentz factor γ. We explicitly obtain an inflationary scenario by the cooperative effect of adding energy density into the Friedmann equation. For the case of a constant Lorentz factor, and under the slow roll assumption, we find the transformation rules for the scalar and tensor power spectra of perturbations as well as their ratio under the action of the form invariance symmetry group. Within this case and due to its relevance for the inflationary paradigm, we find the general solution of the dynamical equations for a DBI field driven by an exponential potential and show a broad set of inflationary solutions. The general solution can be split into three subsets and all these behave asymptotically as a power-law solution at early and at late times. © 2011 American Physical Society. |
| format |
JOUR |
| author |
Chimento, L.P. Lazkoz, R. Richarte, M.G. |
| spellingShingle |
Chimento, L.P. Lazkoz, R. Richarte, M.G. Enhanced inflation in the Dirac-Born-Infeld framework |
| author_facet |
Chimento, L.P. Lazkoz, R. Richarte, M.G. |
| author_sort |
Chimento, L.P. |
| title |
Enhanced inflation in the Dirac-Born-Infeld framework |
| title_short |
Enhanced inflation in the Dirac-Born-Infeld framework |
| title_full |
Enhanced inflation in the Dirac-Born-Infeld framework |
| title_fullStr |
Enhanced inflation in the Dirac-Born-Infeld framework |
| title_full_unstemmed |
Enhanced inflation in the Dirac-Born-Infeld framework |
| title_sort |
enhanced inflation in the dirac-born-infeld framework |
| url |
http://hdl.handle.net/20.500.12110/paper_15507998_v83_n6_p_Chimento |
| work_keys_str_mv |
AT chimentolp enhancedinflationinthediracborninfeldframework AT lazkozr enhancedinflationinthediracborninfeldframework AT richartemg enhancedinflationinthediracborninfeldframework |
| _version_ |
1807321242646085632 |