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Peloso_M

Research Abstracts Online
January 2009 - March 2010

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University of Minnesota Twin Cities
Institute of Technology
School of Physics and Astronomy
Department of Physics

PI: Marco Peloso

Gravity Waves From Non-perturbative Flat Direction Decay

During inflation the flat directions in supersymmetric theories form a condensate. The details of their non-perturbative decay have been previously studied in a linearized calculation for a generic system with U(1) or SU(N) gauge symmetries. It was shown that this condensate may decay very quickly after inflation due to instability generated by fast variation of the mass parameters. These researchers are now extending this study to account for the back reaction effects missed by the linear theory, and evolve the equations of motion for the fields on a lattice. This explosive decay would also generate a gravity wave background, the properties of which depend on parameters of the inflation and the condensate. These gravity waves have been studied in a recent article, on the framework of a very simple flat direction model. It was shown that they can be observable by the upcoming Advanced LIGO observation, depending on the initial value of the condensate, its mass and the reheating temperature. The researchers are extending this study, in collaboration with authors of the article, for a more realistic model containing gauge fields. The gravity wave signature from the flat direction decay offers a new tool for probing the early universe and supersymmetric theories.

Group Member

Ahmet Emir Gumrukcuoglu, Graduate Student