Work

Decay of cosmic global string loops

Year: 2020

Type: article

Abstract: We numerically study the decay of cosmic global string loops due to radiation of Goldstone bosons and massive scalar ($\ensuremath{\chi}$) particles. The length of loops we study range from 200 to 1000 times the width of the string core. We find that the lifetime of a loop is $\ensuremath{\approx}1.4L$. The energy spectrum of Goldstone boson radiation has a ${k}^{\ensuremath{-}1}$ falloff, where $k$ is the wave number, and a sharp peak at $k\ensuremath{\approx}{m}_{\ensuremath{\chi}}/2$, where ${m}_{\ensuremath{\chi}}$ is the mass of $\ensuremath{\chi}$. The latter is a new feature and implies a peak at high energies (MeV-GeV) in the cosmological distribution of QCD axions.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/physrevd.101.083522

Authors: Ayush Saurabh, Tanmay Vachaspati, Levon Pogosian

Institutions: Arizona State University, Simon Fraser University

Language: English

Topic: Dark Matter and Cosmic Phenomena

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funders: U.S. Department of Energy, Arizona State University, University of Texas at Austin, Natural Sciences and Engineering Research Council of Canada

Award: THEORETICAL RESEARCH AT THE HIGH ENERGY FRONTIER: COSMOLOGY AND BEYOND.