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Constructing a neutron star from the lattice in G2-QCD

  • Regular Article - Theoretical Physics
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Abstract.

The inner structure of neutron stars is still an open question. One obstacle is the infamous sign problem of lattice QCD, which bars access to the high-density equation of state. A possibility to make progress and understand the qualitative impact of gauge interactions on the neutron star structure is to study a modified version of QCD without the sign problem. In the modification studied here the gauge group of QCD is replaced by the exceptional Lie group \( G_2\) , which keeps neutrons in the spectrum. Using an equation of state from lattice calculations only we determine the mass-radius-relation for a neutron star using the Tolman-Oppenheimer-Volkoff equation. This allows us to understand the challenges and approximations currently necessary to use lattice data for this purpose. We discuss in detail the particular uncertainties and systematic problems of this approach.

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Authors and Affiliations

  1. University of Graz, Institute of Physics, NAWI Graz, Universitätsplatz 5, 8010, Graz, Austria

    Ouraman Hajizadeh & Axel Maas

Authors
  1. Ouraman Hajizadeh
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  2. Axel Maas
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Correspondence to Ouraman Hajizadeh.

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Communicated by L. Tolos

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Hajizadeh, O., Maas, A. Constructing a neutron star from the lattice in G2-QCD. Eur. Phys. J. A 53, 207 (2017). https://doi.org/10.1140/epja/i2017-12398-x

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  • DOI: https://doi.org/10.1140/epja/i2017-12398-x

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