Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 10, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2015/10/003
Keywords
inflation; particle physics - cosmology connection; supersymmetry and cosmology
Funding
- London Centre for Terauniverse Studies (LCTS) from the European Research Council [267352]
- U.K. STFC [ST/J002798/1]
- DOE [DE-FG02-13ER42020]
- Alexander S. Onassis Public Benefit Foundation
- DOE at the University of Minnesota [DE-SC0011842]
- Science and Technology Facilities Council [ST/J002798/1, ST/L000326/1] Funding Source: researchfish
- STFC [ST/L000326/1, ST/J002798/1] Funding Source: UKRI
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We discuss phenomenological aspects of inflationary models wiith a no-scale supergravity Kahler potential motivated by compactified string models, in which the inflaton may be identified either as a Kahler modulus or an untwisted matter field, focusing on models that make predictions for the scalar spectral index n(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(0) = B-0 = A(0) = 0, of the CMSSM type with universal A(0) and m(0) not equal 0 at a high scale, and of the mSUGRA type with A(0) = B-0 + m(0) boundary conditions at the high input scale. These may be combined with a non-trivial gauge kinetic function that generates gaugino masses m(1/2) not equal 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 Kahler 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.
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