Seminar Details:
Title: | Crunching away the hierarchy or the cosmological constant problem |
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Location: | Oxford |
Speaker: | Csaki, Csaba |
Organiser: | Sarkar, Subir |
Date: | 2021-02-04 16:48:00 |
Link: | www2.physics.ox.ac.uk |
Join Link: | https://zoom.us/j/99110556925 |
Join Description: | Zoom |
Seminar Description:
I present a novel approach to hierarchies related to crunching of regions of space-time. First we use this approach to solve the Higgs hierarchy problem by coupling the SM Higgs to a dilaton of a spontaneously broken CFT, where the dilaton potential will be in a long-lived metastable minimum if the Higgs VEV is below ~1 TeV, otherwise it will quickly settle to a minimum with a large negative CC leading to a big crunch. The experimental prediction of this model is a light (<10 GeV) dilaton with very weak coupling to SM particles via its mixing with the Higgs. Along a similar direction we can also provide a new paradigm for the CC problem: regions of space with a large CC will be very short lived, and only those with a small CC survive to date. This requires a super-cooled phase transition which can again be implemented by assuming the presence of a hidden CFT sector, leading to a prediction of additional relativistic degrees of freedom observable at the next round of CMB measurements.