PIRSA:09060066 Conference Quantum Fields and Strings Particle Physics Cosmology

DOI10.48660/09060066

Conference/School: Exploring the Cosmological Frontiers - Perimeter Institute Summer School - 2009

Bahcall, N. (2009). Weighing the Universe. Perimeter Institute. https://pirsa.org/09060066

Bahcall, Neta. Weighing the Universe. Perimeter Institute, Jun. 24, 2009, https://pirsa.org/09060066 

@misc{ pirsa_PIRSA:09060066,
  doi = {10.48660/09060066},
  url = {https://pirsa.org/09060066},
  author = {Bahcall, Neta},
  keywords = {Quantum Fields and Strings, Particle Physics, Cosmology},
  language = {en},
  title = {Weighing the Universe},
  publisher = {Perimeter Institute},
  year = {2009},
  month = {jun},
  note = {PIRSA:09060066 see, \url{https://pirsa.org}}
}

Abstract

How do we weigh the Universe? Where is the Dark Matter? I will discuss these questions and show that several independent methods, including the observed present-day abundance of rich clusters , the evolution of cluster abundance with redshift, the baryon-fraction in clusters, the observed Mass-to-Light function from galaxies to superclusters, and other large-scale structure observations, all reveal a universe with a low mass density parameter of ~20% of the critical density. The data suggest that the mass in the Universe, including the dark-matter, approximately follows light on large scales and that most of the mass resides in huge dark halos around galaxies. I will review the combined observational evidence for dark-matter and for dark-energy in the universe and their cosmological implications.

Resources

Next talk

Related Talks