标题： T_{μν}的时间演化和宇宙学常数问题 显示英文标题

标题： Time evolution of T_{μν} and the cosmological constant problem

摘要： 我们研究有效量子场论的能量动量张量 T_{\mu \nu }的宇宙时间演化，并表明由于该理论的有效性，T_{\mu \nu }的结构使得真空能量随时间减少。 我们发现当前的零点能量被宇宙演化所消除。 探讨了这一发现对宇宙常数问题的含义。 显示英文摘要

摘要： We study the cosmic time evolution of an effective quantum field theory energy-momentum tensor T_{\mu\nu} and show that, as a consequence of the effective nature of the theory, the structure of T_{\mu\nu} is such that the vacuum energy decreases with time. We find that the zero point energy at present time is washed out by the cosmological evolution. The implications of this finding for the cosmological constant problem are investigated.