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SUMMARY:Fotis Koutroulis (National Technical University of Athens)
DTSTART:20210310T113000Z
DTEND:20210310T123000Z
DTSTAMP:20260423T042228Z
UID:HETatNTUA/9
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/HETatNTUA/9/
 ">When a UV and Quantum 1st Order Phase Transition Gives the Solution to t
 he Higgs Fine-Tuning Problem</a>\nby Fotis Koutroulis (National Technical 
 University of Athens) as part of High Energy Theory\, Gravity  and Cosmolo
 gy Seminars @ NTUA\n\n\nAbstract\nWe construct the zero temperature (no co
 mpact dimensions) effective action for an SU (2) Yang–Mills theory in fi
 ve dimensions\, with boundary conditions that reduce the symmetry on the f
 our-dimensional boundary located at the origin to a U (1)-complex scalar s
 ystem. In order to be sen- sitive to the Higgs phase\, we need to include 
 higher dimen- sional operators in the effective action\, which can be natu
 rally achieved by generating it by expanding the corresponding lattice con
 struction in small lattice spacing\, taking the naive continuum limit and 
 then renormalizing. In addition\, we build in the effective action non-per
 turbative information\, related to a first order quantum phase transition 
 known to exist. As a result\, the effective action acquires a finite cut-o
 ff that is low and the fine tuning of the scalar mass is rather mild.\n
LOCATION:https://researchseminars.org/talk/HETatNTUA/9/
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