Observing long cosmic strings through gravitational lensing

Journal Article · Sat Nov 01 04:00:00 EST 1997 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.56.6193· OSTI ID:545060

de Laix, A A ^[1]

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1. Case Western Reserve University, Department of Physics, Cleveland, Ohio 44106-7079 (United States)

We consider the gravitational lensing produced by long cosmic strings formed in a grand-unified theory scale phase transition. We derive a formula for the deflection of photons which pass near the strings that reduces to an integral over the light cone projection of the string configuration plus constant terms which are not important for lensing. Our strings are produced by performing numerical simulations of cosmic string networks in flat, Minkowski space ignoring the effects of cosmological expansion. These strings have more small scale structure than those from an expanding universe simulation{emdash}fractal dimension 1.3 for Minkowski versus 1.1 for expanding{emdash}but share the same qualitative features. Lensing simulations show that for both pointlike and extended objects strings produce patterns unlike more traditional lenses, and, in particluar, the kinks in strings tend to generate demagnified images which reside close to the string. Thus lensing acts as a probe of the small scale structure of a string. Estimates of lensing probablity suggest that for string energy densities consistent with string seeded structure formation, on the order of tens of string lenses should be observed in the Sloan Digital Sky Survey (SDSS) quasar catalog. We propose a search strategy in which string lenses would be identified in the SDSS quasar survey, and the string nature of the lens can be confirmed by the observation of nearby high redshift galaxies which are also be lensed by the string. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 545060
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 10 Vol. 56; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COSMOLOGY
FLUCTUATIONS
GRAND UNIFIED THEORY
GRAVITATIONAL LENSES
MINKOWSKI SPACE
PHASE TRANSFORMATIONS
PHOTONS
SIMULATION
STRING MODELS