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Research Van Swinderen Institute

Lunch seminar Benedict Broy

When:Tu 01-12-2015 12:30 - 13:30


Benedict Broy


DESY, Hamburg, Germany


Starobinsky-Type Inflation from alpha'-Corrections


Both WMAP and PLANCK have hinted at a slight suppression of power in the CMB temperature spectrum at large angular scales. Yet this power loss is usually unaccounted for by models that are claimed to provide a best fit to the data at first order, such as the Starobinsky f(R) model. In a first step, we demonstrate how to obtain a viable observational signature in f(R) theory by explicitly constructing higher order terms to the Starobinsky model. These higher order terms realise a shift symmetry breaking of the inflaton at large fields. In a second step, we describe a new inflationary scenario deriving from higher derivative corrections in String theory giving rise to a similar observational fingerprint.