10,972 research outputs found
Comment on "Vortex Liquid Crystal in Anisotropic Type II Superconductors"
This is a Comment on "Vortex Liquid Crystal in Anisotropic Type II
Superconductors" by E. W. Carlson et al. in PRL, vol.90, 087001 (2003)
[cond-mat/0209175].Comment: 2 pages, 1 figure, revised versio
Collisional interaction limits between dark matters and baryons in `cooling flow' clusters
Presuming weak collisional interactions to exchange the kinetic energy
between dark matter and baryonic matter in a galaxy cluster, we re-examine the
effectiveness of this process in several `cooling flow' galaxy clusters using
available X-ray observations and infer an upper limit on the heavy dark matter
particle (DMP)proton cross section . With a relative
collisional velocity dependent power-law form of where , our inferred upper
limit is \sigma_0/m_{\rm x}\lsim 2\times10^{-25} {\rm cm}^2 {\rm GeV}^{-1}
with being the DMP mass. Based on a simple stability analysis of
the thermal energy balance equation, we argue that the mechanism of
DMPbaryon collisional interactions is unlikely to be a stable
nongravitational heating source of intracluster medium (ICM) in inner core
regions of `cooling flow' galaxy clusters.Comment: 8 pages, 2 figures, MNRAS accepte
- β¦