Texture induced microwave background anisotropies
- Univ. of Sussex (United Kingdom)
- Imperial College, London (United Kingdom)
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
- Univ. of Arizona, Tucson, AZ (United States)
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.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1155561
- Report Number(s):
- IMPERIAL-TP-93-94-21; PRVDAQ
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 50, Issue 4; ISSN 0556-2821
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
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