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Title: Gravitational waves from preheating in M-flation

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 3N{sup 2} 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 Ω{sub gw}h{sup 2}∝10{sup −16}, suggesting that the model has concrete predictions for the ultra-high frequency gravity-wave probes. This signature could be used to distinguish the modelmore » from rival inflationary models.« less
Authors:
 [1] ; ;  [2] ;  [3] ;  [4]
  1. Physics Department, Lancaster University, Lancaster, LA1 4YB (United Kingdom)
  2. Department of Physics and Astronomy, University of Waterloo, 200 University Avenue, Waterloo, Ontario, N2L 3G1 (Canada)
  3. Department of Physics, McGill University, Montréal, Québec, H3A 2T8 (Canada)
  4. School of Physics, Institute for Research in Fundamental Sciences (IPM), Tehran (Iran, Islamic Republic of)
Publication Date:
OSTI Identifier:
22370636
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 03; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; COMPUTERIZED SIMULATION; FORECASTING; GHZ RANGE; GRAVITATIONAL WAVES; GRAVITY WAVES; LATTICE FIELD THEORY; SCALAR FIELDS; SCALARS; STRING MODELS; STRING THEORY; SUPERSYMMETRY COSMOLOGICAL INFLATION