Wang, F (reprint author), Zhengzhou Univ, Dept Phys & Engn, Zhengzhou 450001, Henan, Peoples R China.
[Wang, Fei] Zhengzhou Univ, Dept Phys & Engn, Zhengzhou 450001, Henan, Peoples R China
; [Wang, Fei] Chinese Acad Sci, Kuvli Inst Theoret Phys China, Beijing 100190, Peoples R China
We calculate the gravitational contributions to phi(4) theory with general R-xi gauge-fixing choice and find that the result is gauge independent. Based on weak coupling expansion of gravity and ignoring the possible higher dimensional operators from "integrating out" the impact of gravity, we study the impacts of gravitational effects on vacuum stability. New contributions to the beta function of scalar quartic coupling lambda by gravitational effects can modify the RGE running of lambda near the Planck scale. Numerical calculations show that the lower bound of higgs mass requiring absolutely vacuum stability can be relaxed for almost 0.6 to 0.8 GeV depending on the choice of top quark mass. (C) 2014 The Author. Published by Elsevier B.V.