High redshift signatures in the 21 cm forest due to cosmic string wakes

Abstract : Cosmic strings induce minihalo formation in the early universe. The resultant minihalos cluster in string wakes and create a 21 cm forest'' against the cosmic microwave background (CMB) spectrum. Such a 21 cm forest can contribute to angular fluctuations of redshifted 21 cm signals integrated along the line of sight. We calculate the root-mean-square amplitude of the 21 cm fluctuations due to strings and show that these fluctuations can dominate signals from minihalos due to primordial density fluctuations at high redshift (zgtrsim10), even if the string tension is below the current upper bound, Gμ < 1.5 × 10-7. Our results also predict that the Square Kilometre Array (SKA) can potentially detect the 21 cm fluctuations due to strings with Gμ ≈ 7.5 × 10-8 for the single frequency band case and 4.0 × 10-8 for the multi-frequency band case.
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Journal articles

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Citation

Hiroyuki Tashiro, Toyokazu Sekiguchi, Joseph Silk. High redshift signatures in the 21 cm forest due to cosmic string wakes. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2014, 2014, ⟨10.1088/1475-7516/2014/01/013⟩. ⟨insu-03645748⟩

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