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KIAS HEP seminars

Reduction of couplings and its implementation in SUSY and non-SUSY models

by Dr Myriam Mondragón (UNAM)

→ Asia/Seoul
Room 1423 (KIAS)

Room 1423 (KIAS)
Description

Title: Reduction of  couplings and its implementation in  SUSY and non-SUSY models

Speaker: Myriam Mondragón

Abstract: 

The Reduction of Couplings (RoC) method is a powerful tool for addressing the problem of the excess of parameters in a field theory, as it yields relations among couplings that are invariant under the renormalization group. Its usefulness becomes particularly evident when constructing predictive N = 1 supersymmetric Grand Unified Theories that are free of UV divergences, that is whose beta function vanishes at all-loops. Although highly predictive, 
only a few GUT theories can become  finite at all loops, or even at 2-loops. In this talk we review the basic idea, the tools that have been developed, as well as some of the resulting theories in which successful reduction of couplings has been achieved so far.
Then by assuming that the finite GUTs are connected to an effective N = 1, d = 4
Weyl-invariant SUGRA theory, we show that this leads to a specific form of the Kähler potential, whose structure coincides with that studied in no-scale supergravity scenarios, and thus to Starobinsky inflation models.
Finally we briefly show how the RoC method can also be applied in non-SUSY multi-Higgs models, and its usefulness.