Effect of dark strings on semilocal strings

Journal Article · Tue Dec 15 04:00:00 EST 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.80.123502· OSTI ID:21313557

Brihaye, Yves ^[1]; Hartmann, Betti ^[2]

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1. Faculte de Sciences, University de Mons, 7000 Mons (Belgium)
2. School of Engineering and Science, Jacobs University Bremen, 28759 Bremen (Germany)

Dark strings have recently been suggested to exist in new models of dark matter that explain the excessive electronic production in the Galaxy. We study the interaction of these dark strings with semilocal strings which are solutions of the bosonic sector of the standard model in the limitsin{sup 2}{theta}{sub w}=1, where {theta}{sub w} is the Weinberg angle. While embedded Abelian-Higgs strings exist for generic values of the coupling constants, we show that semilocal solutions with nonvanishing condensate inside the string core exist only above a critical value of the Higgs to gauge boson mass ratio when interacting with dark strings. Above this critical value, which is greater than unity, the energy per unit length of the semilocal-dark string solutions is always smaller than that of the embedded Abelian-Higgs-dark string solutions and we show that Abelian-Higgs-dark strings become unstable above this critical value. Different from the noninteracting case, we would thus expect semilocal strings to be stable for values of the Higgs to gauge boson mass ratio larger than unity. Moreover, the one-parameter family of solutions present in the noninteracting case ceases to exist when semilocal strings interact with dark strings.

• OSTI ID: 21313557
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 12 Vol. 80; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CONDENSATES
COSMOLOGY
COUPLING CONSTANTS
GALAXIES
GAUGE INVARIANCE
HIGGS BOSONS
HIGGS MODEL
INTERACTIONS
MASS
MATHEMATICAL SOLUTIONS
NONLUMINOUS MATTER
PARTICLE PRODUCTION
STANDARD MODEL
STRING THEORY
WEINBERG ANGLE