# Cosmology with Goldstone bosons

### APA

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

### MLA

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

### BibTex

@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}} }

## Abstract

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.