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KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Los Alamos National Laboratory, United States.
2015 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 804, no 2, 121Article in journal (Refereed) Published
Abstract [en]

Cosmic strings are linear topological defects which are hypothesized to be produced during inflation. Most searches for strings have relied on the string's lensing of background galaxies or the cosmic microwave background. In this paper, I obtained a solution for the supersonic flow of collisional gas past the cosmic string which has two planar shocks with a shock compression ratio that depends on the angle defect of the string and its speed. The shocks result in the compression and heating of the gas and, given favorable conditions, particle acceleration. Gas heating and over-density in an unusual wedge shape can be detected by observing the HI line at high redshifts. Particle acceleration can occur in the present-day universe when the string crosses the hot gas contained in galaxy clusters and, since the consequences of such a collision persist for cosmological timescales, could be located by looking at unusual large-scale radio sources situated on a single spatial plane.

Place, publisher, year, edition, pages
2015. Vol. 804, no 2, 121
Keyword [en]
acceleration of particles, cosmology: theory, hydrodynamics, radio continuum: general, shock waves
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-170265DOI: 10.1088/0004-637X/804/2/121ISI: 000354905000043ScopusID: 2-s2.0-84930011893OAI: diva2:831536

QC 20150630

Available from: 2015-06-30 Created: 2015-06-29 Last updated: 2015-08-17Bibliographically approved

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Beresnyak, Andrey
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