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Title: Gravitational waves from asymmetric oscillon dynamics?

Journal Article · · Physical Review D
 [1];  [2];  [3];  [4];  [5];  [6];  [7]
  1. Rice Univ., Houston, TX (United States); Rice University
  2. Univ. College London (United Kingdom)
  3. Univ. of Nottingham (United Kingdom)
  4. Kenyon College, Gambier, OH (United States); Case Western Reserve Univ., Cleveland, OH (United States)
  5. Kenyon College, Gambier, OH (United States)
  6. Univ. of Illinois at Urbana-Champaign, IL (United States)
  7. Univ. of Science and Technology of China, Hefei (China)

It has been recently suggested that oscillons produced in the early universe from certain asymmetric potentials continue to emit gravitational waves for a number of e-folds of expansion after their formation, leading to potentially detectable gravitational wave signals. We revisit this claim by conducting a convergence study using graphics processing unit (GPU)-accelerated lattice simulations and show that numerical errors accumulated with time are significant in low-resolution scenarios, or in scenarios where the run-time causes the resolution to drop below the relevant scales in the problem. Our study determines that the dominant, growing high frequency peak of the gravitational wave signals in the fiducial "hill-top model" in [arXiv:1607.01314] is a numerical artifact. This new finding prompts the need for a more careful analysis of the numerical validity of other similar results related to gravitational waves from oscillon dynamics.

Research Organization:
Rice Univ., Houston, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0018216
OSTI ID:
1594809
Alternate ID(s):
OSTI ID: 1541187; OSTI ID: 1461244
Journal Information:
Physical Review D, Journal Name: Physical Review D Journal Issue: 2 Vol. 98; ISSN PRVDAQ; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Stochastic gravitational-wave background from axion-monodromy oscillons in string theory during preheating journal September 2019
Stochastic Gravitational-Wave Background from Axion-Monodromy Oscillons in String Theory During Preheating text January 2019
Gravitational waves from gauge preheating text January 2018
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Gravitational perturbations from oscillons and transients after inflation journal June 2019