暗辐射驱动的地球不稳定性和热化
Glueball instability and thermalization driven by dark radiation
摘要：
我们用全息规范理论研究了弯曲时空中的胶球。在IIB超弦理论中，我们得到了一个双参数的解，它分别对应于四维宇宙学常数$λ$和暗辐射$C$.对于$λ<0$和小的$C$，理论处于封闭阶段，在这个理论中我们观察到了稳定的胶球态。然而，当暗辐射（$C$）的密度增加并超过临界点时，胶球状态的稳定性丧失。在这一点以上，自事件视界出现以来，暗辐射就充当杨-米尔斯理论的热浴。因此，系统是热化的，理论处于有限温度解除禁闭阶段，即QGP阶段。我们通过胶球光谱观察到这种转变过程，其随$C$而显著变化。我们还研究了系统的纠缠熵，以寻找这种相变的线索和暗辐射$C$在纠缠熵中的作用。
英文摘要：
We study glueballs in the holographic gauge theories living in a curved space-time. The dual bulk is obtained as a solution of the type IIB superstring theory with two parameters, which correspond to four dimensional (4D) cosmological constant $λ$ and the dark radiation $C$ respectively. The theory is in the confining phase for $λ<0$ and small $C$, then we observe stable glueball states in this theory. However, the stability of the glueball states is lost when the density of the dark radiation ($C$) increases and exceeds a critical point. Above this point, the dark radiation works as the heat bath of the Yang-Mills theory since the event horizon appears. Thus the system is thermalized, and the theory is in a finite temperature deconfinement phase, namely in the QGP phase. We observe this transition process through the glueball spectra which varies dramatically with $C$. We also examined the entanglement entropy of the system to find a clue of this phase transition and the role of the dark radiation $C$ in the entanglement entropy.
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