Dark Energy and Cosmic Sound

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• Daniel Eisenstein (Harvard-Smithsonian Center for Astrophysics)
• Thursday 27 October 2016, 16:00-17:00
• Sackler Lecture Theatre, IoA (tea at 3:30 pm).

If you have a question about this talk, please contact Prof Andy Fabian.

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I will discuss how the acoustic oscillations that propagate in the photon-baryon fluid during the first million years of the Universe provide a robust method for measuring the cosmological distance scale. The distance that the sound can travel can be computed to high precision and creates a signature in the late-time clustering of matter that serves as a standard ruler. Galaxy clustering results from the Sloan Digital Sky Survey reveal this feature at a variety of redshifts. I will review our recent work on the theory and practice of the acoustic oscillation method, describe our latest cosmology results from SDSS -III on the expansion history of the Universe, and introduce the upcoming Dark Energy Spectroscopic Instrument (DESI) project.

This talk is part of the Institute of Astronomy Colloquia series.

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