Inflation from gravitino condensates

7th International Workshop DICE2014 Spacetime – Matter – Quantum Mechanics

物理学;力学

Mavromatos, Nick E.^1,2

King's College London, Department of Physics, Theoretical Particle Physics and Cosmology Group, Strand, London

WC2R 2LS, United Kingdom^1

CERN, Theory Division, Geneva 23

CH 1211, Switzerland^2

关键词: Curvature correction;    Early universe;    Energy scale;    Fine tuning;    Grand unified theories;    Higher-order;    Scalar modes;    Supergravity;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/626/1/012002/pdf
DOI  :  10.1088/1742-6596/626/1/012002

学科分类：力学，机械学

来源: IOP

【 摘 要 】

We review work on the formation of gravitino condensates via the super-Higgs effect in the early Universe. This is a scenario for both inflating the early universe and breaking local supersymmetry(supergravity), entirely independent of any coupling to external matter. The goldstino mode associated with the breaking of (global) supersymmetry is "eaten" by the gravitino field, which becomes massive (via its own vacuum condensation) and breaks supergravity dynamically. The most natural association of gravitino condensates with inflation proceeds in an indirect way, via a Starobinsky-type inflation, in the massive gravitino phase. This inflationary phase is associated with scalar modes hidden in the higher order curvature corrections of the effective action arising from integrating out massive gravitino degrees of freedom. The scenario is in agreement with Planck data phenomenology in a natural and phenomenologically-relevant range of parameters, namely Grand-Unified-Theory values for the supersymmetry breaking energy scale and dynamically-induced gravitino mass. A hill-top inflation, on the other hand, which could also occur in the model, whereby the role of the inflaton field is played by the gravitino condensate itself, would require significant fine tuning in the inflaton's wave function renormalisation and thus may be discarded on naturalness grounds.