Analytical model for CMB temperature angular power spectrum from cosmic (super-)strings

作者：Yamauchi Daisuke^*; Takahashi Keitaro; Sendouda Yuuiti; Yoo Chul Moon; Sasaki Misao

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2010, 82(6): 063518.

DOI：10.1103/PhysRevD.82.063518

We present a new analytical method to calculate the small angle cosmic microwave background (CMB) temperature angular power spectrum due to cosmic (super-)string segments. In particular, using our method, we clarify the dependence on the intercommuting probability P. We find that the power spectrum is dominated by Poisson-distributed string segments. The power spectrum for a general value of P has a plateau on large angular scales and shows a power-law decrease on small angular scales. The resulting spectrum in the case of conventional cosmic strings is in very good agreement with the numerical result obtained by Fraisse et al.. Then we estimate the upper bound on the dimensionless tension of the string for various values of P by assuming that the fraction of the CMB power spectrum due to cosmic (super-)strings is less than ten percent at various angular scales up to l = 2000. We find that the amplitude of the spectrum increases as the intercommuting probability. As a consequence, strings with smaller intercommuting probabilities are found to be more tightly constrained.

• 出版日期2010-9-15