False vacuum energy dominated inflation with large $r$ and the importance of $\kappa_s$

摘要: We investigate to which extent and under 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 constant contribution inflaton potential, present before phase transition takes place absent in true of theory, like e.g. hybrid inflation. Based on model-independent considerations, derive an upper bound possible amount domination highlight importance higher-order runnings scalar spectral index (beyond $\alpha_s$) order realise scenarios study conditions for explicitly potential reconstruction around field value 50 e-folds end inflation, taking into account observational data. To this end, provide up-to-date parameter constraints within $\Lambda$CDM + $r$ $\alpha_s$ $\kappa_s$ using cosmological estimation code Monte Python together Boltzmann CLASS.