Level Crossing Analysis of Cosmic Microwave Background Radiation: A method for detecting cosmic strings

Details Level Crossing Analysis of Cosmic Microwave Background Radiation: A method for detecting cosmic strings Level Crossing Analysis of Cosmic Microwave Background Radiation: A method for detecting cosmic strings

2010-11-11

arxiv.org/abs/1011.2640v2

JCAP 1103:012,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

27 pages, 17 figures. V2: Removed some trivial parts and figures, added references. Accepted for publication in JCAP

Scientific paper

10.1088/1475-7516/2011/03/012

In this paper we study the footprint of cosmic string as the topological defects in the very early universe on the cosmic microwave background radiation. We develop the method of level crossing analysis in the context of the well-known Kaiser-Stebbins phenomenon for exploring the signature of cosmic strings. We simulate a Gaussian map by using the best fit parameter given by WMAP-7 and then superimpose cosmic strings effects on it as an incoherent and active fluctuations. In order to investigate the capability of our method to detect the cosmic strings for the various values of tension, $G\mu$, a simulated pure Gaussian map is compared with that of including cosmic strings. Based on the level crossing analysis, the superimposed cosmic string with $G\mu\gtrsim 4\times 10^{-9}$ in the simulated map without instrumental noise and the resolution $R=1'$ could be detected. In the presence of anticipated instrumental noise the lower bound increases just up to $G\mu\gtrsim 5.8\times 10^{-9}$.

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