Conference Presentation (Invited)

DESY-2014-01727

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png CMB power suppression at low-l from string inflation

Cicoli, M. ; Downes, S. ; Dutta, B. ; Pedro, F.DESY* ; Westphal, A. (Corresponding author)DESY*

2014

Abstract: The PLANCK satellite may have observed a lack of power on large scales (l < 40). 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 almost but not quite 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.

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Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 514 - Theoretical Particle Physics (POF2-514) (POF2-514)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2014

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Database coverage:

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