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Article overview
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How Late can the Dark Matter form in our universe? | | Abir Sarkar
; Subinoy Das
; Shiv K. Sethi
; | | Date: |
27 Oct 2014 | | Abstract: | We put constraints on the epoch of dark matter formation for the case of
certain non-wimp candidate where dark matter appears in between the epoch of
Big Bang Nucleosynthesis and matter radiation equality. In such class of
models, matter power spectra gets a strong suppression even towards linear
scale, if dark matter is formed considerably close to the epoch of matter
radiation equality and thus subject to strong constraints from linear power
spectra measurement from SDSS and Lyman-$alpha$ data. Unlike the case of warm
dark matter, where mainly mass of the dark matter particle controls the
suppression scale, in "Late forming dark matter" scenario, it is the redshift
of dark matter formation which determines the free streaming scale in power
spectra. We use SDSS and lyman-$alpha$ data to directly find the latest epoch
of dark matter formation in our universe. If all the observed dark matter is
late forming, we find lower bound on redshift of dark matter formation $z_f >
1.08 imes 10^5 $ at 99.73 $\%$ C.L from the SDSS data and $z_f > 9 imes
10^5$, at the same C.L, from the Lyman-$alpha$ data. If only a fraction of the
dark matter is late forming then we find tentative evidence of the presence of
LFDM from the Lyman-$alpha$ data. Upcoming data from SDSSIII/Boss will allow
us to explore this issue in more detail. | | Source: | arXiv, 1410.7129 | | Services: | Forum | Review | PDF | Favorites | |
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