Abstract
The cosmological Higgs vacuum stability has been an attractive research subject and it is crucial to accurately follow the development of the Higgs fluctuations. In this work, we thoroughly investigate how the vacuum fluctuations of the Higgs field affect the stability of the electroweak vacuum in Friedmann-Lemaitre-Robertson-Walker (FLRW) background. Adopting adiabatic (WKB) approximation or adiabatic regularization methods, we clearly show that vacuum fluctuations of the Higgs field in the FLRW background depend on the curvature and also masses of the Higgs or other scalar fields. The Higgs fluctuations can generate true vacuum bubbles and trigger off a collapse of the electroweak vacuum. Furthermore we clearly show that the effective Higgs potential in the FLRW background is modified by the Higgs vacuum fluctuations. The vacuum fluctuations of the standard model fields can stabilize or destabilize the effective Higgs potential through backreaction effects. Considering the improved effective Higgs potential with the Higgs vacuum fluctuations $\left< { \delta \phi }^{ 2 } \right>$ in various backgrounds, we provide new cosmological constraints on the mass of the Higgs-coupled scalar fields and a quantitative description of the Higgs stability in the FLRW background.
Highlights
The Large Hadron Collider (LHC) experiments discovered the Higgs boson and established the Standard Model (SM) of particle physics
Adopting adiabatic Wentzel-Kramers-Brillouin method approximation or adiabatic regularization methods, we clearly show that vacuum fluctuations of the Higgs field in the FLRW background depend on the curvature and masses of the Higgs or other scalar fields
We have thoroughly investigated the stability of the electroweak vacuum in the FLRW background
Summary
The Large Hadron Collider (LHC) experiments discovered the Higgs boson and established the Standard Model (SM) of particle physics. In the present paper we thoroughly investigate how the vacuum fluctuations of the Higgs field affect the stability of the electroweak vacuum in Friedmann-LemaitreRobertson-Walker (FLRW) background spacetime. Previous works [13,14,15,16,17,18,19,20,21,22,23,24,25,26,27] about the Higgs vacuum stability in FRW background are based on the standard effective potential in curved spacetime such as Eq (121). Considering the improved effective Higgs potential with the Higgs vacuum fluctuations hδφ2i in various backgrounds, we provide new cosmological constraints on the mass of the Higgs-coupled scalar fields and a quantitative description of the Higgs vacuum stability in the FLRW background..
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