Title: A Friedmann-Lemaitre-Robertson-Walker cosmological model with running Lambda Show Chinese title

Title: 具有运行Λ的Friedmann-Lemaitre-Robertson-Walker宇宙学模型

Abstract: The idea of a variable dark energy has been entertained many times in the literature and from many different points of view. Quintessence is just a popular way to implement this idea in recent times, but so far with little success. Another possibility is to think of the cosmological term, Lambda, as a ``running quantity'' much in the same way as the electromagnetic coupling constant. However, the fact that Lambda is a dimension-four parameter implies that it may obey a peculiar renormalization group equation, which at low energies could be dominated by ``soft decoupling'' contributions of the form Lambda ~ H^2 M_P^2 stemming from physics near the Planck scale. This value lies in the ballpark of the measurements from CMB and high-z supernovae. A ``renormalized'' FLRW cosmology of this kind may reveal itself as a sound, and testable, proposal for a variable Lambda model within quantum field theory in curved space time. Show Chinese abstract

Abstract: 可变暗能量的思想在文献中已被多次探讨，并从许多不同的角度出发。 quintessence只是近年来实现这一思想的一种流行方式，但迄今为止收效甚微。 另一种可能性是将宇宙学项Λ视为“跑动量”，类似于电磁耦合常数的方式。 然而，Λ作为一个四维参数的事实意味着它可能服从一种特殊的重正化群方程，在低能情况下可能被来自普朗克尺度附近物理的“软解耦”贡献所主导，形式为Λ ~ H^2 M_P^2。 这个值与CMB和高红移超新星的测量值相当。 这种“重正化”的FLRW宇宙学可能揭示自身为量子场论在弯曲时空内关于可变Λ模型的一个合理且可检验的提议。