Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-04-28
JCAP 0905:017,2009
Physics
High Energy Physics
High Energy Physics - Theory
21 pages, 2 figures
Scientific paper
10.1088/1475-7516/2009/05/017
We develop further the proposal of arXiv:0806.3692 that a new state of matter -- charged condensate of spin-0 nuclei -- may exist in helium-core dwarf stars. The charged condensate and its fluctuations are described by an effective field theory Lagrangian. The spectrum of bosonic fluctuations is gapped, while electrons, at temperatures of interest, give rise to gapless excitations near the Fermi surface. These properties determine the evolution of the dwarfs with condensed cores. In particular, we show that such dwarf stars would cool significantly faster than their crystallized counterparts. As a result, the luminosity function for the helium-core dwarfs will have a sharp drop-off after the condensation. It is tempting to interpret the recently discovered abrupt termination of a sequence of 24 helium-core dwarf candidates in NGC 6397 as a signature of the charged condensation.
Gabadadze Gregory
Pirtskhalava David
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