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Recently a new particle physics model called Bound Dark Matter (BDM) has beenproposed in which dark matter (DM) particles are massless above a thresholdenergy (Ec) and acquire mass below it due to nonperturbative methods.Therefore, the BDM model describes DM particles which are relativistic, hotdark matter, in the inner regions of galaxies and describes nonrelativistic,cold dark matter, where halo density is below rho_c = Ec^4. To realize thisidea in galaxies we use a particular DM cored profile that contains threeparameters: a scale length (rs) and density (rho_0) of the halo, and a coreradius (rc) stemming from the relativistic nature of the BDM model. We testthis model by fitting rotation curves of seventeen Low Surface Brightnessgalaxies from The HI Nearby Galaxy Survey (THINGS). Since the energy Ecparameterizes the phase transition due to the underlying particle physicsmodel, it is independent on the details of galaxy or structure formation andtherefore the DM profile parameters rs, rc, Ec are constrained, leaving onlytwo free parameters. The high spatial and velocity resolution of this sampleallows to derive the model parameters through the numerical implementation ofthe chi^2-goodness-of-fit test to the mass models. We compare the fittings withthose of Navarro-Frenk-White (NFW), Burkert, and Pseudo-Isothermal (ISO)profiles. Through the results we conclude that the BDM profile fits better, orequally well, than NFW, Burkert, and ISO profiles and agree with previousresults implying that cored profiles are preferred over the N-body motivatedcuspy profile. We also compute 2D likelihoods of the BDM parameters rc and Ecfor the different galaxies and matter contents, and find an average galaxy coreradius rc=300 pc and a transition energy Ec = 0.11 eV when the DM halo is theonly component. In Kroupa mass model, we obtain a core rc=1.48 kpc, and energyEc=0.06 eV.

Core-Cusp revisited and Dark Matter Phase Transition Constrained at O(0.1) eV with LSB Rotation Curve