Ultralight Thomas-Fermi dark matter

Fuzzy cold dark matter: the wave properties of ultralight particles.

Cold dark matter (CDM) models predict small-scale structure in excess of observations of the cores and abundance of dwarf galaxies. These problems might be solved, and the virtues of CDM models retained, even without postulating ad hoc dark matter particle or field interactions, if the dark matter is composed of ultralight scalar particles (m approximately 10(-22) eV), initially in a (cold) Bos...

Detecting Ultralight Bosonic Dark Matter via Absorption in Superconductors

Superconducting targets have recently been proposed for the direct detection of dark matter as light as a keV, via elastic scattering off conduction electrons in Cooper pairs. Detecting such light dark matter requires sensitivity to energies as small as the superconducting gap of O(meV). Here we show that these same superconducting devices can detect much lighter DM, of meV to eV mass, via dark...

Stability of Relativistic Matter via Thomas–fermi Theory

A Thomas-Fermi-Weizsäcker type theory is constructed, by means of which we are able to give a relatively simple proof of the stability of relativistic matter. Our procedure has the advantage over previous ones in that the critical value of the fine structure constant, α, is raised to 0.77 (recall that the critical value is known to be less than 2.72). When α = 1/137, the largest nuclear charge ...

Dipole Moments in Thomas-Fermi-Dirac and Thomas-Fermi Theories

Dark Matter Interpretations of the e± Excesses after FERMI

The cosmic-ray excess observed by PAMELA in the positron fraction and by FERMI and HESS in e− + e can be interpreted in terms of DM annihilations or decays into leptonic final states. Final states into τ ’s or 4μ give the best fit to the excess. However, in the annihilation scenario, they are incompatible with photon and neutrino constraints, unless DM has a quasi-constant density profile. Fina...