Landscape, the scale of SUSY breaking, and inflation

By R. Kallosh, Andrei Linde. 2004

313 citations recorded by the source corpus.

We argue that in the simplest version of the KKLT model, the maximal value of the Hubble constant during inflation cannot exceed the present value of the gravitino mass, Hm3/2. This may have important implications for string cosmology and for the scale of the SUSY breaking in this model. If one wants to have inflation on high energy scale, one must develop phenomenological models with an extremely large gravitino mass. On the other hand, if one insists that the gravitino mass should be O(1 TeV), one will need to develop models with a very low scale of inflation. We show, however, that one can avoid these restrictions in a more general class of KKLT models based on the racetrack superpotential with more than one exponent. In this case one can combine a small gravitino mass and low scale of SUSY breaking with the high energy scale of inflation.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/32cf3a6cdc6703728dcb237999d0a6df181cdce1

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. Andrei Linde
2. R. Kallosh
3. Liam McAllister
4. D. Baumann
5. F. Quevedo
6. M. Cicoli
7. E. Silverstein
8. Eran Palti

In Nuclear and High Energy Physics

1. Andrei Linde
2. R. Kallosh
3. Liam McAllister
4. D. Baumann
5. F. Quevedo
6. M. Cicoli
7. Eran Palti
8. E. Pajer

Citations in the corpus

• Large-volume flux compactifications: Moduli spectrum and D3/D7 soft supersymmetry breaking (2005, background): “This realises several proposals in the past (for recent discussons of this class of models see [51, 52]).”
• Simple exercises to flatten your potential (2010, background): “This has led to important constraints and complications, such as order one corrections to slow roll parameters from compactification effects [6] and bounds on the inflationary energy relative to the scale of moduli stabilizing potential energy barriers [7] [8].”
• Monodromy in the CMB: Gravity Waves and String Inflation (2008, background): “as discussed in the context of the KKLT-style IIB de Sitter vacua in [25].”
• The type IIB string axiverse and its low-energy phenomenology (2012, background): “The standard case in string cosmology is Hinf ≤ m3/2, creating a well-known tension between inflation and supersymmetry breaking since the requirement of generating enough density perturbations sets, in general, Hinf ∼MGUT, forcing m3/2 to be well above the TeV scale [43].”
• Volume modulus inflation and the gravitino mass problem (2008, background): “However, recent studies of inflationary models in string theory revealed a rather unexpected fact: in the simplest models based on the KKLT mechanism the Hubble constant H should be smaller than the present value of the gravitino mass [3],”
• 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].”