Twin cogenesis  

作　　者：Wan-Zhe Feng Jiang-Hao Yu 

机构地区：[1]Center for Joint Quantum Studies and Department of Physics,School of Science,Tianjin University,Tianjin 300350,China [2]Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China [3]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Communications in Theoretical Physics》2023年第4期34-49,共16页理论物理通讯（英文版）

基　　金：supported in part by the National Natural Science Foundation of China under Grant No.11905158 and No.11935009;Natural Science Foundation of Tianjin City under Grant No.20JCQNJC02030;supported in part by the National Science Foundation of China under Grants No.11875003。

摘　　要：We investigate a cogenesis mechanism within the twin Higgs setup that can naturally explain the nature of dark matter,the cosmic coincidence puzzle,little hierarchy problem,leptogenesis,and the tiny neutrino masses.Three heavy Majorana neutrinos are introduced to the standard model sector and the twin sector respectively,which explain the tiny neutrino masses and generate the lepton asymmetry and the twin lepton asymmetry at the same time.The twin cogenesis mechanism applies to any viable twin Higgs model without an explicit Z_(2)breaking in the leptonic sector and evading theΔN_(eff) constraint.We illustrate the twin cogenesis mechanism using the neutrino-philic twin two Higgs doublet model,a newly proposed model to lift the twin neutrino masses with spontaneous Z_(2)breaking.The dark photon with a Stueckelberg mass O(10)MeV ensures the energy in the twin sector as well as the symmetric component of twin sector particles can be depleted.The lightest twin baryons are the dark matter candidates with masses of approximately 5.5 GeV,which explains naturally the amount of dark matter and visible matter in the Universe are of the same order.We also demonstrate twin cogenesis in the fraternal twin Higgs setup,in which the dark matter candidate is the twin bottom bound stateΩ’_(b’b’b’).

关 键 词：cogenesis cosmic coincidence asymmetric dark matter LEPTOGENESIS neutrino mass 

分 类 号：P159[天文地球—天文学]