{"arxiv_id":"hep-ph/0304285","title":"Chern-Simons production during preheating in hybrid inflation models","abstract":"We study the onset of symmetry breaking after hybrid inflation in a model having the field content of the SU(2) gauge-scalar sector of the standard model, coupled to a singlet inflaton. This process is studied in (3+1)-dimensions in a fully non-perturbative way with the help of lattice techniques within the classical approximation. We focus on the role played by gauge fields and, in particular, on the generation of Chern-Simons number. Our results are shown to be insensitive to the various cut-offs introduced in our numerical approach. The spectra preserves a large hierarchy between long and short-wavelength modes during the whole period of symmetry breaking and Chern-Simons generation, confirming that the dynamics is driven by the low momentum sector of the theory. We establish that the Chern-Simons production mechanism is associated with local sphaleron-like structures. The corresponding sphaleron rates are of order 10^{-5} m^4, which, within certain scenarios of electroweak baryogenesis and a (not unnaturally large) additional source of CP violation, could explain the present baryon asymmetry of the universe.","primary_cat":"hep-ph","cross_cats":["hep-lat","hep-th"],"submitted_at":"2003-04-30T11:10:22+00:00","latest_version":2,"source":"arxiv","source_label":"arXiv","source_url":null,"has_pdf":true,"has_source":false,"verdict":"CONDITIONAL","confidence":"MODERATE","one_line_summary":"Lattice simulation of tachyonic preheating after hybrid inflation finds Chern-Simons number generated at a rate of order 10^-5 m^4 in localized lumps of size about 1/m_W, with results stable under changes of lattice spacing and box size.","novelty_score":6.0,"correctness_risk":"medium","formal_verification":"none","upvotes":0,"downvotes":0,"pith_score":0,"inbound_count":22,"_links":{"html":"https://pith.science/paper/hep-ph/0304285","verdict":"/api/v1/verdicts/hep-ph/0304285"}}