论文标题
应力 - 能量张量的哪一部分吸引人？
Which part of the stress-energy tensor gravitates?
论文作者
论文摘要
我们认为，在半经典的爱因斯坦方程中，宇宙学空间的可能性是由高于瞬时基态的应激能量量所提供的。为了使这种可能性保持一致，比安奇的身份必须继续保持。这是非平凡的，因为这意味着，尽管基态在不同的时间通常是不同的状态，但压力 - 能量张量的基态期望值必须是协变量的。我们证明这种一致性条件确实存在。结果，我们发现，只要存在瞬时地面状态和瞬时的绝热真空吸尘器，就不会使宇宙常数更重新归一化的真空应力能量。
We consider the possibility that, in the semiclassical Einstein equation for cosmological spacetimes, gravity is sourced by the amount of stress-energy that is above that of the instantaneous ground state. For this possibility to be consistent, the Bianchi identities must continue to hold. This is nontrivial because it means that the ground state expectation value of the stress-energy tensor must be covariantly conserved in spite of the fact that the ground state is generally a different state at different times. We prove that this consistency condition does hold. As a consequence, we find that the vacuum stress-energy which is above the instantaneous ground state does not renormalize the cosmological constant, as long as the instantaneous ground states and the instantaneous adiabatic vacua exist.
