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Paper   IPM / Physic / 13274
School of Physics
  Title:   Gravitational Waves from Preheating in M-flation
  Author(s): 
1.  A. Ashoorioon
2.  B. Fung
3.  R. B. Mann
4.  M. Oltean
5.  M.M. Sheikh-Jabbari
  Status:   Published
  Journal: JCAP
  Vol.:  1403
  Year:  2014
  Pages:   020
  Supported by:  IPM
  Abstract:
Matrix inflation, or M-flation, is a string theory motivated inflationary model with three scalar field matrices and gauge fields in the adjoint representation of the U(N) gauge group. One of these 3N2 scalars appears as the effective inflaton while the rest of the fields (scalar and gauge fields) can play the role of isocurvature fields during inflation and preheat fields afterwards. There is a region in parameter space and initial field values, "the hilltop region," where predictions of the model are quite compatible with the recent Planck data. We show that in this hilltop region, if the inflaton ends up in the supersymmetric vacuum, the model can have an embedded preheating mechanism. Couplings of the preheat modes are related to the inflaton self-couplings and therefore are known from the CMB data. Through lattice simulations performed using a symplectic integrator, we numerically compute the power spectra of gravitational waves produced during the preheating stage following M-flation. The preliminary numerical simulation of the spectrum from multi-preheat fields peaks in the GHz band with an amplitude Ωgwh2propto10−16, suggesting that the model has concrete predictions for the ultra-high frequency gravity-wave probes. This signature could be used to distinguish the model from rival inflationary models.

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