BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:David Dunsky (NYU) DTSTART:20230321T183000Z DTEND:20230321T193000Z DTSTAMP:20260423T024531Z UID:nhetc/74 DESCRIPTION:Title: A Heavy QCD Axion and the Mirror World\nby David Dunsky (NYU) as part o f NHETC Seminar\n\n\nAbstract\nIn this talk\, I will discuss the mirror wo rld with dark matter arising from the thermal freeze-out of the lightest\, stable mirror particle -- the mirror electron. The dark matter abundance is achieved for mirror electrons of mass 225 GeV\, fixing the mirror elect roweak scale near 10^8 GeV. This highly predictive scenario is realized by an axion that acts as a portal between the two sectors through its coupli ng to the QCD and mirror QCD sectors. The axion is more massive than the s tandard QCD axion due to additional contributions from mirror strong dynam ics. Still\, the strong CP problem is solved by this "heavy" axion due to the alignment of the QCD and mirror QCD potentials. Mirror entropy is tran sferred into the Standard Model sector via the axion portal\, which allevi ates overproduction of dark radiation from mirror glueball decays. I will discuss four signals from this model: (1) primordial gravitational waves f rom the first-order mirror QCD phase transition occurring at a temperature near 35 GeV\, (2) effects on large-scale structure from dark matter self- interactions from mirror QED\, (3) dark radiation affecting the cosmic mic rowave background\, and (4) the rare kaon decay\, (kaon -> pion +axion). T he first two signals do not depend on any fundamental free parameters of t he theory while the latter two depend on a single free parameter\, the axi on decay constant.\n LOCATION:https://researchseminars.org/talk/nhetc/74/ END:VEVENT END:VCALENDAR