Cosmology with Goldstone bosons


Croon, D. (2015). Cosmology with Goldstone bosons. Perimeter Institute. https://pirsa.org/15090074


Croon, Djuna. Cosmology with Goldstone bosons. Perimeter Institute, Sep. 22, 2015, https://pirsa.org/15090074


          @misc{ pirsa_15090074,
            doi = {10.48660/15090074},
            url = {https://pirsa.org/15090074},
            author = {Croon, Djuna},
            keywords = {Particle Physics},
            language = {en},
            title = {Cosmology with Goldstone bosons},
            publisher = {Perimeter Institute},
            year = {2015},
            month = {sep},
            note = {PIRSA:15090074 see, \url{https://pirsa.org}}
Talk Type Scientific Series


I will discuss the appeal of pseudo-Goldstone bosons (pGBs) for the generation of scales in Early Universe cosmology. In particular, I will demonstrate how in Goldstone Inflation a pGB inflaton can solve the hierarchy problem of inflation (the tension between the Lyth bound and the inflationary scale as preferred by CMB anisotropies), while avoiding the problems with trans-Planckian scales that are typically associated with related models. A simple model based on the coset SU(4)/Sp(4) realises both the Higgs doublet and an inflaton singlet as Goldstone modes. A single setup can then give rise to Goldstone Inflation and the dynamical generation of the electroweak scale through a composite Higgs, thus also addressing the EW hierarchy problem. I will discuss perturbative reheating in this model, and show how it naturally connects to both EW physics and a UV completion. If time permits I will address our current studies on non-perturbative reheating and the possibility of electroweak baryogenesis in this setup.