期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 10, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2012/10/030
关键词
gravitational lensing; Cosmic strings; domain walls; monopoles; weak gravitational lensing
资金
- JSPS [24540257]
- Grants-in-Aid for Scientific Research [24540257] Funding Source: KAKEN
We study the observational signature of vector metric perturbations through the effect of weak gravitational lensing. In the presence of vector perturbations, the non-vanishing signals for B-mode cosmic shear and curl-mode deflection angle, which have never appeared in the case of scalar metric perturbations, naturally arise. Solving the geodesic and geodesic deviation equations, we drive the full-sky formulas for angular power spectra of weak lensing signals, and give the explicit expressions for E-/B-mode cosmic shear and gradient-/curl-mode deflection angle. As a possible source for seeding vector perturbations, we then consider a cosmic string network, and discuss its detectability from upcoming weak lensing and CMB measurements. Based on the formulas and a simple model for cosmic string network, we calculate the angular power spectra and expected signal-to-noise ratios for the B-mode cosmic shear and curl-mode deflection angle. We find that the weak lensing signals are enhanced for a smaller intercommuting probability of the string network, P, and they are potentially detectable from the upcoming cosmic shear and CMB lensing observations. For P similar to 10(-1), the minimum detectable tension of the cosmic string will be down to G mu similar to 5 x 10(-8). With a theoretically inferred smallest value P similar to 10(-3), we could even detect the string with G mu similar to 5 x 10(-10).
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