Volume modulus inflation and the gravitino mass problem

By Joseph P. Conlon, R. Kallosh, Andrei Linde, F. Quevedo. 2008

141 citations recorded by the source corpus.

The Hubble constant during the last stages of inflation in a broad class of models based on the Kachru–Kallosh–Linde–Trivedi mechanism should be smaller than the gravitino mass, . We point out that in the models with large volume of compactification the corresponding constraint typically is even stronger, , in Planck units. In order to address this problem, we propose a class of models with large volume of compactification where inflation may occur exponentially far away from the present vacuum state. In these models, the Hubble constant during inflation can be many orders of magnitude greater than the gravitino mass. We introduce a toy model describing this scenario, and discuss its strengths and weaknesses.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/8ecf965c6bad016ea16d05764a13add9b5f3b6f2

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Citations in the corpus

The type IIB string axiverse and its low-energy phenomenology (2012, background): “achieved if the volume mode is the inflaton [44].”
D-branes at del Pezzo singularities: global embedding and moduli stabilisation (2012, background): “This also ameliorates the Kallosh-Linde problem regarding the relative size of H and m3/2 in string models with stabilised moduli [82, 83].”
Galaxy UV-luminosity function and reionization constraints on axion dark matter (2014, background): “…any significant amount of the DM (Marsh et al. 2014b).8 Any evidence for the existence of a ULA in this mass range would therefore be a signal of nontrivial axion dynamics during or after inflation (e.g. Conlon et al. 2008), or a non-tensor source of B-modes (e.g. Pospelov et al. 2009).”
Dynamical systems applied to cosmology: Dark energy and modified gravity (2017, background): “…cosmological evolution of the volume moduli in the KKLT (Kachru et al., 2003a,b) class of Inflationary Universe models arising out of Type IIB string theory (Brustein et al., 2004; Barreiro et al., 2005) and to models where the volume of the compact dimensions can be large (Conlon et al., 2008).”
The Swampland: Introduction and Review (2019, background): “This has in some sense been appreciated for a while, see for example [271,546].”
Boltzmann brains and the scale-factor cutoff measure of the multiverse (2008, background): “100 eV are not entirely impossible in the string landscape, they are extremely difficult to construct [86].”
Inflation and String Theory (2014, background): “2, lead to the appearance of an inflection point in the potential [776].”
SUSY breaking in local string/F-theory models (2009, background): “It also ameliorates the gravitino mass problem pointed out in [52, 53].”
On the possibility of large axion moduli spaces (2014, background): “For a related work on inflation in the LVS, see [26].”