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Title: Texture induced microwave background anisotropies

Abstract

We use numerical simulations to calculate the cosmic microwave background anisotropy induced by the evolution of a global texture field, with special emphasis on individual textures. Both spherically symmetric and general configurations are analyzed, and in the latter case we consider field configurations which exhibit unwinding events and also ones which do not. We compare the results given by evolving the field numerically under both the expanded core (XCORE) and non-linear sigma model (NLSM) approximations with the analytic predictions of the NLSM exact solution for a spherically symmetric self-similar (SSSS) unwinding. We find that the random unwinding configuration spots' typical peak height is 60-75\% and angular size typically only 10% of those of the SSSS unwinding, and that random configurations without an unwinding event nonetheless may generate indistinguishable hot and cold spots. A brief comparison is made with other work.

Authors:
 [1];  [2];  [3];  [4];  [5]
  1. Univ. of Sussex (United Kingdom)
  2. Imperial College, London (United Kingdom)
  3. Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
  4. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  5. Univ. of Arizona, Tucson, AZ (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1155561
Report Number(s):
IMPERIAL-TP-93-94-21
Journal ID: ISSN 0556-2821; PRVDAQ
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 50; Journal Issue: 4; Journal ID: ISSN 0556-2821
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Borrill, Julian, Copeland, Edmund J., Liddle, Andrew R., Stebbins, Albert, and Veeraraghavan, Shoba. Texture induced microwave background anisotropies. United States: N. p., 1994. Web. doi:10.1103/PhysRevD.50.2469.
Borrill, Julian, Copeland, Edmund J., Liddle, Andrew R., Stebbins, Albert, & Veeraraghavan, Shoba. Texture induced microwave background anisotropies. United States. https://doi.org/10.1103/PhysRevD.50.2469
Borrill, Julian, Copeland, Edmund J., Liddle, Andrew R., Stebbins, Albert, and Veeraraghavan, Shoba. 1994. "Texture induced microwave background anisotropies". United States. https://doi.org/10.1103/PhysRevD.50.2469. https://www.osti.gov/servlets/purl/1155561.
@article{osti_1155561,
title = {Texture induced microwave background anisotropies},
author = {Borrill, Julian and Copeland, Edmund J. and Liddle, Andrew R. and Stebbins, Albert and Veeraraghavan, Shoba},
abstractNote = {We use numerical simulations to calculate the cosmic microwave background anisotropy induced by the evolution of a global texture field, with special emphasis on individual textures. Both spherically symmetric and general configurations are analyzed, and in the latter case we consider field configurations which exhibit unwinding events and also ones which do not. We compare the results given by evolving the field numerically under both the expanded core (XCORE) and non-linear sigma model (NLSM) approximations with the analytic predictions of the NLSM exact solution for a spherically symmetric self-similar (SSSS) unwinding. We find that the random unwinding configuration spots' typical peak height is 60-75\% and angular size typically only 10% of those of the SSSS unwinding, and that random configurations without an unwinding event nonetheless may generate indistinguishable hot and cold spots. A brief comparison is made with other work.},
doi = {10.1103/PhysRevD.50.2469},
url = {https://www.osti.gov/biblio/1155561}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 4,
volume = 50,
place = {United States},
year = {Tue Mar 01 00:00:00 EST 1994},
month = {Tue Mar 01 00:00:00 EST 1994}
}