论文标题
声音的速度超出了晶格模拟的高密度相对论极限，浓密的两色QCD
Velocity of Sound beyond the High-Density Relativistic Limit from Lattice Simulation of Dense Two-Color QCD
论文作者
论文摘要
我们从晶格蒙特卡洛模拟的低温和高密度下获得两色QCD的状态方程（EOS）。我们发现，在超级流体阶段，声音的速度超过了相对论极限（$ c_s^2/c^2 = 1/3 $）。以前，从类似QCD的理论的任何晶格计算中，声音速度过高。这一发现可能与中子恒星质量和半径的测量结果揭示的中子恒星物质EO具有可能的相关性。
We obtain the equation of state (EoS) for two-color QCD at low temperature and high density from the lattice Monte Carlo simulation. We find that the velocity of sound exceeds the relativistic limit ($c_s^2/c^2=1/3$) after BEC-BCS crossover in the superfluid phase. Such an excess of the sound velocity is previously unknown from any lattice calculations for QCD-like theories. This finding might have a possible relevance to the EoS of neutron star matter revealed by recent measurements of neutron star masses and radii.
