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Symmetric Nuclear Matter from the Strong Interaction.

M Leonhardt1, M Pospiech1, B Schallmo1

  • 1Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.

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|October 16, 2020
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Summary
This summary is machine-generated.

Researchers explored nuclear matter's equation of state using two methods. They found a maximum speed of sound at high densities, linked to a diquark gap, exceeding the usual limit.

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Area of Science:

  • Nuclear Physics
  • Quantum Chromodynamics
  • Theoretical Physics

Background:

  • Understanding the equation of state for nuclear matter is crucial for nuclear physics.
  • Existing models often rely on extrapolations or simplified assumptions at high densities.

Purpose of the Study:

  • To investigate the equation of state of symmetric nuclear matter across a wide density range.
  • To compare results from chiral effective field theory and quantum chromodynamics-based methods.

Main Methods:

  • Calculated energy per particle using nucleon-nucleon and three-nucleon interactions (chiral effective field theory) at low densities.
  • Derived constraints from quantum chromodynamics using functional renormalization group techniques at high densities.
  • Employed a Fierz-complete setting for high-density calculations.

Main Results:

  • Achieved remarkable consistency between the two complementary theoretical approaches.
  • Observed a natural emergence of a maximum in the speed of sound (cS) at supranuclear densities.
  • This maximum exceeds the asymptotic value of cS^2 = 1/3 and is connected to a diquark gap.

Conclusions:

  • The study provides a robust description of nuclear matter's equation of state from low to high densities.
  • The findings suggest a connection between the speed of sound maximum and diquark gap formation.
  • Further research is needed to pinpoint the exact density at which this maximum occurs.