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Research Abstracts Online
January 2010 - March 2011

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University of Minnesota Twin Cities
College of Science and Engineering
School of Physics and Astronomy

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 extended 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 were studied in an 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 extended this study, in collaboration with the 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