Dark matter from the Fraternal Twin Higgs


Lasenby, R. (2015). Dark matter from the Fraternal Twin Higgs. Perimeter Institute. https://pirsa.org/15100069


Lasenby, Robert. Dark matter from the Fraternal Twin Higgs. Perimeter Institute, Oct. 06, 2015, https://pirsa.org/15100069


          @misc{ pirsa_PIRSA:15100069,
            doi = {10.48660/15100069},
            url = {https://pirsa.org/15100069},
            author = {Lasenby, Robert},
            keywords = {Particle Physics},
            language = {en},
            title = {Dark matter from the Fraternal Twin Higgs},
            publisher = {Perimeter Institute},
            year = {2015},
            month = {oct},
            note = {PIRSA:15100069 see, \url{https://pirsa.org}}

Robert Lasenby Stanford University

Talk Type Scientific Series


Twin Higgs theories attempt to solve the little hierarchy problem - why has the LHC not yet observed new states stabilising the EW scale? - by introducing a SM-neutral twin sector, related to the SM by an approximate Z_2 symmetry. The physical Higgs is then a PNGB mixture from both sectors, and acts as a portal between them. In this talk, I will discuss the cosmology of minimal (“fraternal”) Twin Higgs models. Higgs portal interactions establish thermal equilibrium between the SM and twin sector at high temperatures, giving a thermal history with possibilities for both symmetric dark matter (through a “twin WIMP miracle”), and asymmetric dark matter (from twin QCD states which naturally have GeV-scale masses). More generally, relic abundances of cosmologically stable states place constraints on the parameters of the theory, and twin sector phase transitions need to be considered.