Gravitational lensing effect on the two-point correlation of hot spots in the cosmic microwave background

Masahiro Takada, Eiichiro Komatsu, Toshifumi Futamase

研究成果: Article査読

13 被引用数 (Scopus)

抄録

We investigate the weak gravitational lensing effect that is due to the large-scale structure of the universe on two-point correlations of local maxima (hot spots) in the two-dimensional sky map of the cosmic microwave background (CMB) anisotropy. According to the Gaussian random statistics, as most inflationary scenarios predict, the hot spots are discretely distributed, with some characteristic angular separations on the last scattering surface that are due to oscillations of the CMB angular power spectrum. The weak lensing then causes pairs of hot spots, which are separated with the characteristic scale, to be observed with various separations. We found that the lensing fairly smooths out the oscillatory features of the two-point correlation function of hot spots. This indicates that the hot spot correlations can be a new statistical tool for measuring the shape and normalization of the power spectrum of matter fluctuations from the lensing signatures.

本文言語English
ページ(範囲)L83-L87
ジャーナルAstrophysical Journal Letters
533
2
DOI
出版ステータスPublished - 2000 4 20

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学

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