Title: A Heavy QCD Axion and the Mirror World
In this talk, I will discuss the mirror world with dark matterarising from the thermal freeze-out of the lightest, stable mirror particle --the mirror electron. The dark matter abundance is achieved for mirror electronsof mass 225 GeV, fixing the mirror electroweak scale near 10^8 GeV. This highlypredictive scenario is realized by an axion that acts as a portal between thetwo sectors through its coupling to the QCD and mirror QCD sectors. The axionis more massive than the standard QCD axion due to additional contributionsfrom mirror strong dynamics. Still, the strong CP problem is solved by this"heavy" axion due to the alignment of the QCD and mirror QCDpotentials. Mirror entropy is transferred into the Standard Model sector viathe axion portal, which alleviates overproduction of dark radiation from mirrorglueball decays. I will discuss four signals from this model: (1) primordialgravitational waves from the first-order mirror QCD phase transition occurringat a temperature near 35 GeV, (2) effects on large-scale structure from darkmatter self-interactions from mirror QED, (3) dark radiation affecting thecosmic microwave background, and (4) the rare kaon decay, (kaon -> pion+axion). The first two signals do not depend on any fundamental free parametersof the theory while the latter two depend on a single free parameter, the axiondecay constant.
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