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Topology of microwave background fluctuations - TheoryTopological measures are used to characterize the microwave background temperature fluctuations produced by 'standard' scenarios (Gaussian) and by cosmic strings (non-Gaussian). Three topological quantities: total area of the excursion regions, total length, and total curvature (genus) of the isotemperature contours, are studied for simulated Gaussian microwave background anisotropy maps and then compared with those of the non-Gaussian anisotropy pattern produced by cosmic strings. In general, the temperature gradient field shows the non-Gaussian behavior of the string map more distinctively than the temperature field for all topology measures. The total contour length and the genus are found to be more sensitive to the existence of a stringy pattern than the usual temperature histogram. Situations when instrumental noise is superposed on the map, are considered to find the critical signal-to-noise ratio for which strings can be detected.
Document ID
19900040971
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Gott, J. Richard, III
(Princeton Univ. NJ, United States)
Park, Changbom
(Princeton Univ. NJ, United States)
Bies, William E.
(Princeton Univ. NJ, United States)
Bennett, David P.
(Princeton University NJ, United States)
Juszkiewicz, Roman
(Institute for Advanced Study, Princeton, NJ; Polska Akademia Nauk, Centrum Astronomiczne Warsaw, Poland)
Date Acquired
August 14, 2013
Publication Date
March 20, 1990
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 352
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
90A28026
Funding Number(s)
CONTRACT_GRANT: NSF AST-87-21484
CONTRACT_GRANT: W-7405-ENG-48
CONTRACT_GRANT: NAGW-765
CONTRACT_GRANT: NSF PHY-80-19725
Distribution Limits
Public
Copyright
Other

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