摘要
The quintessence-like potential of vacuum energy can meet the requirements from both quantum gravity and the accelerating expansion of the universe.The anti-de Sitter(AdS)vacuum in string theory must be lifted to the meta-stable dS vacuum with a positive vacuum energy density to explain the accelerating expansion of the universe.Based on possible large-scale Lorentz violation,we define an effective cosmological constant that depends not only on the bare cosmological constant but also on the Lorentz violation effect.We find that the evolution of the effective cosmological constant exhibits the behavior of the quintessence potential when the bare cosmological constant originates from the string landscape,in contrast to the existence of a local minimum during evolution when the bare cosmological constant is supplied by the swampland.The critical value of the bare cosmological constant is approximately zero for the behavior transition.The frozen large-scale Lorentz violation can uplift the AdS vacua to an effective quintessence-like one in this sense.
作者
Hanyu Zhai
Jiayin Shen
Xun Xue
翟韩豫;申佳音;薛迅(Department of Physics,East China Normal University,Shanghai 200241,China;Center for Theoretical Physics,Xinjiang University,Urumqi 830046,China)
基金
Supported by the National Natural Science Foundation of China(11775080,11865016)。
