We study the electroweak phase transition in three scalar extension models beyond the Standard Model.Assuming new scalars are decoupled at some heavy scale, we use the covariant derivative expansion method to derive a...We study the electroweak phase transition in three scalar extension models beyond the Standard Model.Assuming new scalars are decoupled at some heavy scale, we use the covariant derivative expansion method to derive all of the dimension-6 effective operators, whose coefficients are highly correlated in a specific model. We provide bounds to the complete set of dimension-6 operators by including the electroweak precision test and recent Higgs measurements. We find that the parameter space of strong first-order phase transitions（induced by the ｜H｜~6 operator）can be probed extensively in Zh production at future electron-positron colliders.展开更多
Primordial black holes(PBHs) offer a compelling candidate for dark matter. The production of PBHs through well-tested and accepted physical processes is highly worthy of investigation. This work highlights the role of...Primordial black holes(PBHs) offer a compelling candidate for dark matter. The production of PBHs through well-tested and accepted physical processes is highly worthy of investigation. This work highlights the role of turbulences in the very early universe in sustaining intense and persistent fluctuations in energy or mass density,which could provide a natural mechanism for PBH formation in the primordial universe. We analyze the mass range and abundance of PBHs produced in the magnetohydrodynamic turbulence induced by the electroweak phase transition. Remarkably, we find that the mass range of the produced PBHs falls within the most viable“asteroid mass” window from the present-day observations, and within natural parameter regions their abundance can be sufficiently large. These findings suggest that PBHs produced during magnetohydrodynamic turbulence in the very early universe may comprise a dominant part of dark matter.展开更多
We study a minimal extension of the standard model by introducing three right-handed neutrinos and a new scotogenic scalar doublet,in which the mass splittings between neutral and charged components are responsible fo...We study a minimal extension of the standard model by introducing three right-handed neutrinos and a new scotogenic scalar doublet,in which the mass splittings between neutral and charged components are responsible for the W-boson mass newly measured by the CDF Collaboration.This model can not only generate non-vanishing Majorana neutrino masses via the interaction of right-handed neutrinos and scotogenic scalars,but also explain the Universe’s missing matter in the form of FIMP dark matter.We also study the influence of the mass splitting on the first order electroweak phase transition,and find that it can further enhance the transition strength and thus induce gravitational waves during the phase transition,which may be detected in the forthcoming detectors such as U-DECIGO.展开更多
基金supported in part by the National Science Foundation of China(11175069,11275009,11422545)supported by the NSFC(11121092,11033005,11375202)+1 种基金by the CAS Pilot-B programsupported by the China Postdoctoral Science Foundation(2016M590133,2017T100108)
文摘We study the electroweak phase transition in three scalar extension models beyond the Standard Model.Assuming new scalars are decoupled at some heavy scale, we use the covariant derivative expansion method to derive all of the dimension-6 effective operators, whose coefficients are highly correlated in a specific model. We provide bounds to the complete set of dimension-6 operators by including the electroweak precision test and recent Higgs measurements. We find that the parameter space of strong first-order phase transitions（induced by the ｜H｜~6 operator）can be probed extensively in Zh production at future electron-positron colliders.
基金supported by the International Partnership Program of the Chinese Academy of Sciences (Grant No.025GJHZ2023106GC)。
文摘Primordial black holes(PBHs) offer a compelling candidate for dark matter. The production of PBHs through well-tested and accepted physical processes is highly worthy of investigation. This work highlights the role of turbulences in the very early universe in sustaining intense and persistent fluctuations in energy or mass density,which could provide a natural mechanism for PBH formation in the primordial universe. We analyze the mass range and abundance of PBHs produced in the magnetohydrodynamic turbulence induced by the electroweak phase transition. Remarkably, we find that the mass range of the produced PBHs falls within the most viable“asteroid mass” window from the present-day observations, and within natural parameter regions their abundance can be sufficiently large. These findings suggest that PBHs produced during magnetohydrodynamic turbulence in the very early universe may comprise a dominant part of dark matter.
基金supported by the National Natural Science Foundation of China(11805161,12005180,and 11975195)the Natural Science Foundation of Shandong Province(ZR2020QA083 and ZR2019JQ04)the Project of Shandong Province Higher Educational Science and Technology Program(2019KJJ007)。
文摘We study a minimal extension of the standard model by introducing three right-handed neutrinos and a new scotogenic scalar doublet,in which the mass splittings between neutral and charged components are responsible for the W-boson mass newly measured by the CDF Collaboration.This model can not only generate non-vanishing Majorana neutrino masses via the interaction of right-handed neutrinos and scotogenic scalars,but also explain the Universe’s missing matter in the form of FIMP dark matter.We also study the influence of the mass splitting on the first order electroweak phase transition,and find that it can further enhance the transition strength and thus induce gravitational waves during the phase transition,which may be detected in the forthcoming detectors such as U-DECIGO.
