skip to main content

SciTech ConnectSciTech Connect

Title: On the anisotropy of the gravitational wave background from massless preheating

When a light scalar field is present during inflation, its value varies on superhorizon scales, modulating the preheating process at the end of inflation. Consequently, the amplitude of the gravitational wave (GW) background produced during preheating is also modulated. The observed energy density of this background appears therefore anisotropic at different angles in the sky. We provide a master formula for the angular power spectrum C{sub l} of the anisotropies in the GW background from preheating, valid for any scenario where the anisotropies are due to the superhorizon modulation of a light degree of freedom. Using lattice field theory simulations of massless preheating with g{sup 2}/λ = 2, we find a flat angular spectrum l(l+1)C{sub l} ≈ 3 × 10{sup −4}, which represents a strong anisotropy of ∼ 1% variations on large angular scales. For our choice of couplings, long wavelengths are amplified most strongly during parametric resonance, which is crucial for the development of the anisotropies. If future direct detection GW observatories are capable of detecting backgrounds of cosmological origin, they (may also) be able to detect this effect. This could eventually become a powerful tool to discriminate among inflationary and preheating scenarios.
Authors:
;  [1] ;  [2]
  1. Theoretical Physics, Blackett Laboratory, Imperial College, London, SW7 2AZ (United Kingdom)
  2. Département de Physique Théorique and Center for Astroparticle Physics, Université de Genève, 24 quai Ernest Ansermet, CH–1211 Genève 4 (Switzerland)
Publication Date:
OSTI Identifier:
22373495
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 06; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; ANISOTROPY; COSMOLOGICAL INFLATION; DETECTION; ENERGY DENSITY; GRAVITATIONAL WAVES; LATTICE FIELD THEORY; MODULATION; SCALAR FIELDS; SIMULATION; SKY