Lumps and bumps in the early universe

          @misc{ pirsa_PIRSA:10110050,
            doi = {10.48660/10110050},
            url = {https://pirsa.org/10110050},
            author = {Amin, Mustafa},
            keywords = {Cosmology},
            language = {en},
            title = {Lumps and bumps in the early universe},
            publisher = {Perimeter Institute},
            year = {2010},
            month = {nov},
            note = {PIRSA:10110050 see, \url{https://pirsa.org}}
          }
          

Abstract

I will discuss the emergence of large, localized, pseudo-stable configurations (oscillons) from inflaton fragmentation at the end of inflation. Remarkably, the emergent oscillons take up >50 per cent of the energy density of the inflaton. First, I will give an overview of oscillons, provide some analytic solutions and discuss their stability. Then, I will discuss the conditions necessary for their emergence and provide estimates for their cosmological number density. I will show results from detailed 3+1-dimensional numerical simulations and compare them to the analytic estimates. Finally, I discuss possible observational consequences of oscillons in the early universe.