Quantum liquid signatures in dwarf stars

Gregory Gabadadze, David Pirtskhalava

    Research output: Contribution to journalArticle

    Abstract

    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.

    Original languageEnglish (US)
    Article number017
    JournalJournal of Cosmology and Astroparticle Physics
    Volume2009
    Issue number5
    DOIs
    StatePublished - 2009

    Keywords

    • Cosmological phase transitions
    • White and brown dwarfs

    ASJC Scopus subject areas

    • Astronomy and Astrophysics

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