Phenomenological aspects of no-scale inflation models

Ellis, John; Garcia, Marcos A.G.; Nanopoulos, Dimitri V.; Olive, Keith A.

doi:10.1088/1475-7516/2015/10/003

Phenomenological aspects of no-scale inflation models

Journal Article · Thu Oct 01 04:00:00 EDT 2015 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2015/10/003· OSTI ID:22458384

Ellis, John ^[1]; Garcia, Marcos A.G. ^[2]; Nanopoulos, Dimitri V. ^[3]; Olive, Keith A. ^[2]

Theoretical Particle Physics and Cosmology Group, Department of Physics,King’s College London,WC2R 2LS London (United Kingdom)
William I. Fine Theoretical Physics Institute, School of Physics and Astronomy,University of Minnesota,116 Church Street SE, Minneapolis, MN 55455 (United States)
George P. and Cynthia W. Mitchell Institute for Fundamental Physics andAstronomy, Texas A&M University,College Station, 77843 Texas (United States)

We discuss phenomenological aspects of inflationary models wiith a no-scale supergravity Kähler potential motivated by compactified string models, in which the inflaton may be identified either as a Kähler modulus or an untwisted matter field, focusing on models that make predictions for the scalar spectral index n{sub s} and the tensor-to-scalar ratio r that are similar to the Starobinsky model. We discuss possible patterns of soft supersymmetry breaking, exhibiting examples of the pure no-scale type m{sub 0}=B{sub 0}=A{sub 0}=0, of the CMSSM type with universal A{sub 0} and m{sub 0}≠0 at a high scale, and of the mSUGRA type with A{sub 0}=B{sub 0}+m{sub 0} boundary conditions at the high input scale. These may be combined with a non-trivial gauge kinetic function that generates gaugino masses m{sub 1/2}≠0, or one may have a pure gravity mediation scenario where trilinear terms and gaugino masses are generated through anomalies. We also discuss inflaton decays and reheating, showing possible decay channels for the inflaton when it is either an untwisted matter field or a Kähler modulus. Reheating is very efficient if a matter field inflaton is directly coupled to MSSM fields, and both candidates lead to sufficient reheating in the presence of a non-trivial gauge kinetic function.

Sponsoring Organization:: SCOAP3, CERN, Geneva (Switzerland)

OSTI ID:: 22458384

Journal Information:: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 10 Vol. 2015; ISSN 1475-7516

Country of Publication:: United States

Language:: English

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