ABSTRACT:
The Baryon Oscillation Spectroscopic Survey (BOSS) has opened the possibility to measure the expansion rate and geometry of the Universe at redshift z>2 using baryon acoustic oscillations (BAO) in the Lyman-alpha forest. I will present the latest measurements of the BAO scale using the Lyman-alpha forest auto-correlation and the quasar-Lyman-alpha forest cross-correlation based on more than 130,000 quasar spectra taken from SDSS-III Data Release 11. By combining the BAO results for the auto- and cross-correlation, the Hubble parameter and the angular diameter distance at z=2.34 are measured to 2% and 3% accuracy, respectively. New advances in the modeling of broadband distortions of the auto-correlation due to quasar continuum fitting enable us to also make significantly more accurate measurements of the large-scale linear bias and redshift-space distortion of the Lyman-alpha forest.