PIRSA:26040091

Video URL

https://pirsa.org/26040091

Cautionary Tales from the Local Universe

Gallagher, S. (2026). Cautionary Tales from the Local Universe. Perimeter Institute for Theoretical Physics. https://pirsa.org/26040091

Gallagher, Sarah. Cautionary Tales from the Local Universe. Perimeter Institute for Theoretical Physics, Apr. 14, 2026, https://pirsa.org/26040091 

          @misc{ scivideos_PIRSA:26040091,
            doi = {10.48660/26040091},
            url = {https://pirsa.org/26040091},
            author = {Gallagher, Sarah},
            keywords = {Cosmology},
            language = {en},
            title = {Cautionary Tales from the Local Universe},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2026},
            month = {apr},
            note = {PIRSA:26040091 see, \url{https://scivideos.org/pirsa/26040091}}
          }

Sarah Gallagher Canadian Space Agency

Talk numberPIRSA:26040091
DOI10.48660/26040091
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

Studying low-redshift analogues of phenomena in the early Universe is an established method for getting a closer look at intriguing physics. However, determining when a local analogue functions well to represent distant systems, and what limitations need to be kept in mind, can be challenging. Notably, low redshift examples often reveal complexity that gets hidden when looking at high redshift objects. For distant objects, limited spatial and spectral resolution and reduced sensitivity can lead to extraordinary claims that do not hold up over time. I'll discuss specific examples of local analogues that reveal complexity that should be considered when studying distant objects, focussing on local compact galaxy groups and super Eddington-accreting active galactic nuclei.