School of Physics and Astronomy

Cosmology with the Lyman-alpha forest

18 March 2016

Time: 2:30pm
Venue: GO Jones Room 610

Astronomy Unit Seminars
An┼że Slosar
Timothy Clifton

Lyman-alpha forest is a unique tracer of structure at high redshift. It probes an important epoch in the evolution of the Universe, just before dark energy kicks in, covers massive amounts of volume and has systematics that are very different to those in galaxy surveys. BOSS has given us unprecendent amount of data, allowing Lyman-alpha forest to be used as a three-dimensional tracer for the first time. Using BOSS data we have measured Baryon Acoustic Oscillations in forest-forest and forest-quasar correlations and thus constrained the expansion history of universe at about half its present age to percent level accuracy. I'll discuss these victories and prospects for future battles in constraining fundamental physics using this important probe.