Nonlinear Evolution of Cosmological Structures in Warm Dark Matter Models - 3 views
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Kaiki Inoue on 08 Dec 11From N-body simulation, the authors find that concentration-mass relation displays a turnover for group scale dark matter haloes, for the case of WDM particles with masses of the order ~0.25 keV. This may be interpreted as a hint for top-down structure formation on small scales. Is there any reionization mechanism in this scenario?
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Phil Marshall on 09 Dec 11Sorry I can't be there today - I am really interested in this paper though! I have some questions: 1) Why hasn't this been seen before? Is their resolution or volume only now high enough? Could it be an artifact? 2) What do they suggest we measure, and how well? M? c? Inner profile slope? In how many systems? Thanks!
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Kaiki Inoue on 09 Dec 111)Because the size of the simulated boxes were ten times smaller in previous studies. 2)Weak lensing at scale below ~1arcsec could work. Their results might be helpful for estimating non-linear power spectrum based on a certain halo model.
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Phil Marshall on 09 Dec 11Cooool. Was Malin there this morning? This could be right up her street, with her flexion stuff! Also, weak lensing at < 1" sounds a bit like strong lensing to me - I'll read the paper in detail and see if there's anything we can already say from our (admittedly modest) SDSS samples. Thanks!