ELECTROWEAK PHASE TRANSITION S AND HIGGS COUPLINGS Patrick Meade - PowerPoint PPT Presentation

ELECTROWEAK PHASE TRANSITION S AND HIGGS COUPLINGS Patrick Meade C.N. Yang Institute for Theoretical Physics Stony Brook University Based mostly on PM, H. Ramani 1807.07578 PM. S. Homiller 1808/9.xxxxx David Curtin, PM, H. Ramani 1612.00466

MOTIVATION… Why do I care about the early universe and the Higgs and not DM for instance?

MOTIVATION…

MOTIVATION… “It doesn’t seem like there’s anything interesting in pheno lately. Maybe Neutrinos?” L. Alvarez-Gaume (Simons Center for Geometry & Physics director at Stony Brook) my atavistic pheno impulse is to give a panglossian view of our field: “X,Y, and Z are being done, amazing new possibilities”

DATA/REALITY DRIVEN VIEW: 6000 5000 4000 [ µ K 2 ] 3000 D TT � 2000 1000 0 600 60 300 30 ∆ D TT � 0 0 -30 -300 -60 -600 2 10 30 500 1000 1500 2000 2500 � Fig. 1. Planck 2015 temperature power spectrum. At multipoles ` ≥ 30 we show the maximum likelihood frequency-averaged temperature spectrum computed from the Plik cross-half-mission likelihood, with foreground and other nuisance parameters de- termined from the MCMC analysis of the base Λ CDM cosmology. In the multipole range 2 ≤ ` ≤ 29, we plot the power spectrum estimates from the Commander component-separation algorithm, computed over 94 % of the sky. The best-fit base Λ CDM theoreti- cal spectrum fitted to the Planck TT + lowP likelihood is plotted in the upper panel. Residuals with respect to this model are shown in the lower panel. The error bars show ± 1 � uncertainties. No clear sign of any deviations, or where to even test??

BY AND LARGE WE STILL HAVE ALL THE SAME PROBLEMS WE’VE HAD FOR DECADES • Hierarchy Problem • Dark Matter • Matter anti-Matter asymmetry • Neutrino Mass origin • Strong CP problem • Flavor • Number of generations • Apparent Unification of Coupling Constants • Inflation • Reheating • Unification with Gravity • Cosmological Constant Problem

EXPERIMENT TO THE RESCUE?

THERE IS PROGRESS EXPERIMENTALLY! FIG. 4: Ideas to probe low-mass DM via scattering o ff , or absorption by, nuclei (NR) or electrons (ER). “Dark Sectors” abound… just ask Howie

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LAMPPOST EFFECT Not just limited to Dark Matter of course

WHY NO NOBEL FOR INFLATION? Inflation!

WHY NO NOBEL FOR INFLATION? We don’t know when it happened to better than ~15 orders of magnitude!!!

LAMPPOST EFFECT I’m not a wise professor nor lucky, so…

LAMPPOST EFFECT Is there a confluence of a lamppost and a theory motivation ?

Higgs Lamp