PIRSA:09050000

Using Large-Scale Structure and CMB Observations to Probe the Properties of Dark Energy

Spergel, D. (2009). Using Large-Scale Structure and CMB Observations to Probe the Properties of Dark Energy. Perimeter Institute. https://pirsa.org/09050000

Spergel, David. Using Large-Scale Structure and CMB Observations to Probe the Properties of Dark Energy. Perimeter Institute, May. 27, 2009, https://pirsa.org/09050000 

          @misc{ pirsa_PIRSA:09050000,
            doi = {10.48660/09050000},
            url = {https://pirsa.org/09050000},
            author = {Spergel, David},
            keywords = {Cosmology},
            language = {en},
            title = {Using Large-Scale Structure and CMB Observations to Probe the Properties of Dark Energy},
            publisher = {Perimeter Institute},
            year = {2009},
            month = {may},
            note = {PIRSA:09050000 see, \url{https://pirsa.org}}
          }

David Spergel

Princeton University

Talk number
PIRSA:09050000
Collection
Talk Type
Subject
Abstract
Cosmologists are struggling to understand why the expansion rate of our universe is now accelerating. There are two sets of explanations for this remarkable observation: dark energy fills space or general relativity fails on cosmological scales. If dark energy is the solution to the cosmic acceleration problem, then the logarithmic growth rate of structure $dlnG/dlna = \Omega^\gamma$, where $\Omega$ is the matter density independent of scale in a dark matter plus dark energy model. By combining measurements of the amplitude of redshift space, $\beta = (1/b) dlnG/dlna$ with measurements of galaxy bias, $b$, from cross-correlations with CMB lensing, redshift surveys will be able to determine the logarithmic growth rate as a function of scale and redshift. I will discuss the role of upcoming surveys in improving our ability to understand the origin of cosmic acceleration.