PIRSA:16090048

Video URL

https://pirsa.org/16090048

A small weak scale from a small cosmological constant

Huang, J. (2016). A small weak scale from a small cosmological constant. Perimeter Institute for Theoretical Physics. https://pirsa.org/16090048

Huang, Junwu. A small weak scale from a small cosmological constant. Perimeter Institute for Theoretical Physics, Sep. 27, 2016, https://pirsa.org/16090048 

          @misc{ scivideos_PIRSA:16090048,
            doi = {10.48660/16090048},
            url = {https://pirsa.org/16090048},
            author = {Huang, Junwu},
            keywords = {Particle Physics},
            language = {en},
            title = {A small weak scale from a small cosmological constant},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2016},
            month = {sep},
            note = {PIRSA:16090048 see, \url{https://scivideos.org/pirsa/16090048}}
          }

Junwu Huang Perimeter Institute for Theoretical Physics

Talk numberPIRSA:16090048
DOI10.48660/16090048
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

In this talk, I will present a framework in which Weinberg's anthropic explanation of the cosmological constant problem also solves the hierarchy problem. The weak scale is selected by chiral dynamics that controls the stabilization of an extra dimension. When the Higgs vacuum expectation value is close to a fermion mass scale, the radius of an extra dimension becomes large, and develops an enhanced number of vacua available to scan the cosmological constant down to its observed value. The fermion sector that controls the size of the extra dimension consists of a pair of electroweak doublets and several singlets. These leptons satisfy approximate mass relations related to the weak scale and are accessible to the LHC and future colliders. At low energies, the radion necessarily appears as an unnaturally light scalar, in a range of masses and couplings accessible to fifth-force searches as well as scalar dark matter searches with atomic clocks and gravitational-wave detectors.