The lack of power on large scales (l < 40) might have been observed by the PLANCK satellite. We argue that this putative feature can be explained by a phase of fast roll at the onset of inflation. We show that in the context of single field models what is required is an asymmetric inflection point model of which fibre inflation is a string motivated example. We study the ability of fibre inflation to generate a suppression of the CMB 2-point function power at low l, finding that the potential derived from string loops is not steep enough for this purpose. We introduce a steeper contribution to the potential, that dominates away from the inflationary region, and show that if properly tuned it can indeed lead to a spectrum with lack of power at large scales.

Francisco Soares Verissimo Gil Pedro, ., Alexander, W. (2014). Low-$\ell$ CMB power loss in string inflation. JOURNAL OF HIGH ENERGY PHYSICS, 04, 1-17 [10.1007/JHEP04(2014)034].

Low-$\ell$ CMB power loss in string inflation

Francisco Soares Verissimo Gil Pedro;
2014

Abstract

The lack of power on large scales (l < 40) might have been observed by the PLANCK satellite. We argue that this putative feature can be explained by a phase of fast roll at the onset of inflation. We show that in the context of single field models what is required is an asymmetric inflection point model of which fibre inflation is a string motivated example. We study the ability of fibre inflation to generate a suppression of the CMB 2-point function power at low l, finding that the potential derived from string loops is not steep enough for this purpose. We introduce a steeper contribution to the potential, that dominates away from the inflationary region, and show that if properly tuned it can indeed lead to a spectrum with lack of power at large scales.
2014
Francisco Soares Verissimo Gil Pedro, ., Alexander, W. (2014). Low-$\ell$ CMB power loss in string inflation. JOURNAL OF HIGH ENERGY PHYSICS, 04, 1-17 [10.1007/JHEP04(2014)034].
Francisco Soares Verissimo Gil Pedro, ; Alexander, Westphal
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/613550
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