Signals of Inflation in a Friendly String Landscape
Following Freivogel {\it et al} we consider inflation in a predictive (or `friendly') region of the landscape of string vacua, as modeled by Arkani-Hamed, Dimopoulos and Kachru. In such a region the dimensionful coefficients of super-renormalizable operators unprotected by symmetries, such as t...
| Päätekijät: | , |
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| Aineistotyyppi: | Journal article |
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2006
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| _version_ | 1826304989342990336 |
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| author | March-Russell, J Riva, F |
| author_facet | March-Russell, J Riva, F |
| author_sort | March-Russell, J |
| collection | OXFORD |
| description | Following Freivogel {\it et al} we consider inflation in a predictive (or `friendly') region of the landscape of string vacua, as modeled by Arkani-Hamed, Dimopoulos and Kachru. In such a region the dimensionful coefficients of super-renormalizable operators unprotected by symmetries, such as the vacuum energy and scalar mass-squareds are freely scanned over, and the objects of study are anthropically or `environmentally' conditioned probability distributions for observables. In this context we study the statistical predictions of (inverted) hybrid inflation models, where the properties of the inflaton are probabilistically distributed. We derive the resulting distributions of observables, including the deviation from flatness $|1-\Omega|$, the spectral index of scalar cosmological perturbations $n_s$ (and its scale dependence $dn_s/d\log k$), and the ratio of tensor to scalar perturbations $r$. The environmental bound on the curvature implies a solution to the $\eta$-problem of inflation with the predicted distribution of $(1-n_s)$ indicating values close to current observations. We find a relatively low probability ($<3%$) of `just-so' inflation with measurable deviations from flatness. Intermediate scales of inflation are preferred in these models. |
| first_indexed | 2024-03-07T06:26:05Z |
| format | Journal article |
| id | oxford-uuid:f45787dc-abf6-4a05-893b-f69d91f4c8b7 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T06:26:05Z |
| publishDate | 2006 |
| record_format | dspace |
| spelling | oxford-uuid:f45787dc-abf6-4a05-893b-f69d91f4c8b72022-03-27T12:19:05ZSignals of Inflation in a Friendly String LandscapeJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:f45787dc-abf6-4a05-893b-f69d91f4c8b7Symplectic Elements at Oxford2006March-Russell, JRiva, FFollowing Freivogel {\it et al} we consider inflation in a predictive (or `friendly') region of the landscape of string vacua, as modeled by Arkani-Hamed, Dimopoulos and Kachru. In such a region the dimensionful coefficients of super-renormalizable operators unprotected by symmetries, such as the vacuum energy and scalar mass-squareds are freely scanned over, and the objects of study are anthropically or `environmentally' conditioned probability distributions for observables. In this context we study the statistical predictions of (inverted) hybrid inflation models, where the properties of the inflaton are probabilistically distributed. We derive the resulting distributions of observables, including the deviation from flatness $|1-\Omega|$, the spectral index of scalar cosmological perturbations $n_s$ (and its scale dependence $dn_s/d\log k$), and the ratio of tensor to scalar perturbations $r$. The environmental bound on the curvature implies a solution to the $\eta$-problem of inflation with the predicted distribution of $(1-n_s)$ indicating values close to current observations. We find a relatively low probability ($<3%$) of `just-so' inflation with measurable deviations from flatness. Intermediate scales of inflation are preferred in these models. |
| spellingShingle | March-Russell, J Riva, F Signals of Inflation in a Friendly String Landscape |
| title | Signals of Inflation in a Friendly String Landscape |
| title_full | Signals of Inflation in a Friendly String Landscape |
| title_fullStr | Signals of Inflation in a Friendly String Landscape |
| title_full_unstemmed | Signals of Inflation in a Friendly String Landscape |
| title_short | Signals of Inflation in a Friendly String Landscape |
| title_sort | signals of inflation in a friendly string landscape |
| work_keys_str_mv | AT marchrussellj signalsofinflationinafriendlystringlandscape AT rivaf signalsofinflationinafriendlystringlandscape |