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Title: Decay rates of Gaussian-type I-balls and Bose-enhancement effects in 3+1 dimensions

I-balls/oscillons are long-lived spatially localized lumps of a scalar field which may be formed after inflation. In the scalar field theory with monomial potential nearly and shallower than quadratic, which is motivated by chaotic inflationary models and supersymmetric theories, the scalar field configuration of I-balls is approximately Gaussian. If the I-ball interacts with another scalar field, the I-ball eventually decays into radiation. Recently, it was pointed out that the decay rate of I-balls increases exponentially by the effects of Bose enhancement under some conditions and a non-perturbative method to compute the exponential growth rate has been derived. In this paper, we apply the method to the Gaussian-type I-ball in 3+1 dimensions assuming spherical symmetry, and calculate the partial decay rates into partial waves, labelled by the angular momentum of daughter particles. We reveal the conditions that the I-ball decays exponentially, which are found to depend on the mass and angular momentum of daughter particles and also be affected by the quantum uncertainty in the momentum of daughter particles.
Authors:
;  [1] ;  [2]
  1. Kavli IPMU (WPI), TODIAS, University of Tokyo, Kashiwa, 277-8583 (Japan)
  2. (Japan)
Publication Date:
OSTI Identifier:
22454492
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 02; Other Information: PUBLISHER-ID: JCAP02(2014)001; OAI: oai:repo.scoap3.org:1189; Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA)
Sponsoring Org:
SCOAP3, CERN, Geneva (Switzerland)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANGULAR MOMENTUM; CHAOS THEORY; COSMOLOGY; DAUGHTER PRODUCTS; DECAY; GAUSSIAN PROCESSES; INFLATIONARY UNIVERSE; PARTIAL WAVES; PHASE TRANSFORMATIONS; SCALAR FIELDS; SPHERICAL CONFIGURATION; SUPERSYMMETRY