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DTSTART:20160101T000000
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DTSTART;TZID=UTC:20160223T160000
DTEND;TZID=UTC:20160223T170000
DTSTAMP:20260528T193451
CREATED:20150916T161251Z
LAST-MODIFIED:20150916T161251Z
UID:125-1456243200-1456246800@rpm.physics.lbl.gov
SUMMARY:Andreu Font-Ribera (LBNL) "Studying the Expansion of the Universe with Quasar Spectra"
DESCRIPTION:Abstract: \nFrom 2009 to 2014\, the Baryon Oscillation Spectroscopic Survey (BOSS) used the SDSS telescope to obtain spectra of 1.5 million galaxies to get very accurate measurements of the Baryon Acoustic Oscillations (BAO) scale at redshift z ~0.5. At the same time\, BOSS observed over 184 000 high redshift quasars (z>2.15) with the goal of detecting the BAO feature in the clustering of the intergalactic medium\, using a technique known as the Lyman alpha forest (LyaF).\nIn this talk I will overview several results from the LyaF working group in BOSS\, including the measurement of BAO at z=2.4 both from the auto-correlation of the LyaF (Delubac et al. 2015)\, and from its cross-correlation with quasars (Font-Ribera et al. 2014). From the combination of these studies we are able to measure the expansion rate of the Universe 11 billion years ago with a 2% uncertainty.\nIn the near future\, the Dark Energy Spectroscopic Instrument (DESI) will increase this data set by an order of magnitude. DESI will provide an exquisite measurement of the expansion over cosmic time\, while at the same time addressing other interesting questions: the sum of the mass of the neutrino species\, properties of dark matter particles\, tests of general relativity and the shape of the primordial power spectrum of density fluctuations.
URL:https://rpm.physics.lbl.gov/event/reserved-9/
LOCATION:Zoom Talk\, 50A-5132\, Berkeley\, ca\, 94720
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