Article
Landscape, the Scale of SUSY Breaking, and Inflation
Journal of High Energy Physics (Impact Factor: 6.11). 11/2004; 0412(12). DOI: 10.1088/11266708/2004/12/004
Source: arXiv
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 "In LVS models where H > m 3/2 m 3/2 M P and the inflaton is the volume mode, the destabilisation problem of [1] becomes an overshooting problem since the inflaton has an initial energy which is larger than the barrier to decompactification. The solution to this problem via radiation production after the end of inflation has already been discussed in [2], and so we shall not dwell on this issue. "
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ABSTRACT: Highscale string inflationary models are in wellknown tension with lowenergy supersymmetry. A promising solution involves models where the inflaton is the volume of the extra dimensions so that the gravitino mass relaxes from large values during inflation to smaller values today. We describe a possible microscopic origin of the scalar potential of volume modulus inflation by exploiting nonperturbative effects, string loop and higher derivative perturbative corrections to the supergravity effective action together with contributions from antibranes and charged hidden matter fields. We also analyse the relation between the size of the flux superpotential and the position of the latetime minimum and the inflection point around which inflation takes place. We perform a detailed study of the inflationary dynamics for a single modulus and a two moduli case where we also analyse the sensitivity of the cosmological observables on the choice of initial conditions. 
 "For example, in the G2 − M SSM , the gravitino mass is comparable to the moduli mass and so the decay is kinetically forbidden [12]. Another challenging problem is the socalled 'overshoot' or 'KalloshLinde' problem [49]. As an example, in Type IIB (KKLT) string compactifications, the height of the stabilization barrier is set by the gravitino mass. "
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ABSTRACT: We critically review the role of cosmological moduli in determining the postinflationary history of the universe. Moduli are ubiquitous in string and Mtheory constructions of beyond the Standard Model physics, where they parametrize the geometry of the compactification manifold. For those with masses determined by supersymmetry breaking this leads to their eventual decay slightly before Big Bang Nucleosynthesis (without spoiling its predictions). This results in a matter dominated phase shortly after inflation ends, which can influence baryon and dark matter genesis, as well as observations of the Cosmic Microwave Background and the growth of largescale structure. Given progress within fundamental theory, and guidance from dark matter and collider experiments, nonthermal histories have emerged as a robust and theoretically wellmotivated alternative to a strictly thermal one. We review this approach to the early universe and discuss both the theoretical challenges and the observational implications.International Journal of Modern Physics D 02/2015; 24(08). DOI:10.1142/S0218271815300220 · 1.74 Impact Factor 
 "Only that it would require the height of the inflaton potential to be much higher that the SUSYbreaking scalar potential. This may lead to problems e.g. in scenarios in which there are moduli whose vevs are fixed upon SUSY breaking, see e.g.[4]. "
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ABSTRACT: Recent BICEP2 results on CMB polarisation Bmodes suggest a high value for the inflation scale $V_0^{1/4} \simeq 10^{16}$ GeV, giving experimental evidence for a physical scale in between the EW scale and the Planck mass. We propose that this new high scale could be interpreted as evidence for a high SUSY breaking scale $M_{ss}\simeq 10^{12}10^{13}$ GeV. We show that such a large value for $M_{ss}$ is consistent with a Higgs mass around 126 GeV. We briefly discuss some possible particle physics implications of this assumption.Physics Letters B 03/2014; 734. DOI:10.1016/j.physletb.2014.05.077 · 6.13 Impact Factor