The QCD Equation of State to O(μ_B^4).
Abstract
We present results from an ongoing calculation of the QCD equation of state at finite baryon chemical potential $\mu_B$. We use the method of Taylor expansions to circumvent the sign problem and calculate the expansion coefficients to sixth order using HISQ fermions. We work at two lattice spacings, namely $N_\tau=6$ and 8 and, though we do not take the continuum limit, demonstrate that cutoff effects remain under control. We also use our results to construct an equation of state along the freeze-out curve. Using our sixth-order results as a cross-check, we demonstrate that our fourth-order equation of state is suitable for the modeling of dense matter created in heavy ion collisions with center-of-mass energies down to $s_{NN}^{1/2}\sim20$ GeV.
- Publication:
-
7th International Conference on Physics and Astrophysics of Quark Gluon Plasma
- Pub Date:
- 2015
- DOI:
- 10.22323/1.242.0055
- arXiv:
- arXiv:1412.6727
- Bibcode:
- 2015paqp.confE..55H
- Keywords:
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- High Energy Physics - Lattice;
- High Energy Physics - Phenomenology;
- Nuclear Theory
- E-Print:
- 7 pages, 5 figures