Charged condensate and helium dwarf stars

Gregory Gabadadze, Rachel A. Rosen

    Research output: Contribution to journalArticle

    Abstract

    White dwarf stars composed of carbon, oxygen and heavier elements are expected to crystallize as they cool down below certain temperatures. Yet, simple arguments suggest that the helium white dwarf cores may not solidify, mostly because of zero-point oscillations of the helium ions that would dissolve the crystalline structure. We argue that the interior of the helium dwarfs may instead form a macroscopic quantum state in which the charged helium-4 nuclei are in a Bose-Einstein condensate, while the relativistic electrons form a neutralizing degenerate Fermi liquid. We discuss the electric charge screening, and the spectrum of this substance, showing that the bosonic long-wavelength fluctuations exhibit a mass gap. Hence, there is a suppression at low temperatures of the boson contribution to the specific heat - the latter being dominated by the specific heat of the electrons near the Fermi surface. This state of matter may have observational signatures.

    Original languageEnglish (US)
    Article number030
    JournalJournal of Cosmology and Astroparticle Physics
    Volume2008
    Issue number10
    DOIs
    StatePublished - Oct 1 2008

    Fingerprint

    dwarf stars
    B stars
    condensates
    helium
    specific heat
    white dwarf stars
    helium isotopes
    helium ions
    heavy elements
    electric charge
    Fermi liquids
    Bose-Einstein condensates
    Fermi surfaces
    electrons
    screening
    bosons
    signatures
    retarding
    oscillations
    nuclei

    Keywords

    • Cosmological phase transitions
    • Quantum field theory on curved space

    ASJC Scopus subject areas

    • Astronomy and Astrophysics

    Cite this

    Charged condensate and helium dwarf stars. / Gabadadze, Gregory; Rosen, Rachel A.

    In: Journal of Cosmology and Astroparticle Physics, Vol. 2008, No. 10, 030, 01.10.2008.

    Research output: Contribution to journalArticle

    Gabadadze, Gregory ; Rosen, Rachel A. / Charged condensate and helium dwarf stars. In: Journal of Cosmology and Astroparticle Physics. 2008 ; Vol. 2008, No. 10.
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