False vacuum energy dominated inflation with large $r$ and the importance of $\kappa_s$
| Autor: | Antusch, Stefan, Cefala, Francesco, Nolde, David, Orani, Stefano |
|---|---|
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | JCAP 1410 (2014) 10, 015 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/1475-7516/2014/10/015 |
| Popis: | We investigate to which extent and under which circumstances false vacuum energy ($V_0$) dominated slow-roll inflation is compatible with a large tensor-to-scalar ratio $r = O(0.1)$, as indicated by the recent BICEP2 measurement. With $V_0$ we refer to a constant contribution to the inflaton potential, present before a phase transition takes place and absent in the true vacuum of the theory, like e.g. in hybrid inflation. Based on model-independent considerations, we derive an upper bound on the possible amount of $V_0$ domination and highlight the importance of higher-order runnings of the scalar spectral index (beyond $\alpha_s$) in order to realise scenarios of $V_0$ dominated inflation. We study the conditions for $V_0$ domination explicitly with an inflaton potential reconstruction around the inflaton field value 50 e-folds before the end of inflation, taking into account the present observational data. To this end, we provide the up-to-date parameter constraints within $\Lambda$CDM + $r$ + $\alpha_s$ + $\kappa_s$ using the cosmological parameter estimation code Monte Python together with the Boltzmann code CLASS. Comment: 16 pages, 5 figures; v2: matches publication in JCAP |
| Databáze: | arXiv |
| Externí odkaz: |
|