Bulletin of the American Physical Society
APS April Meeting 2015
Volume 60, Number 4
Saturday–Tuesday, April 11–14, 2015; Baltimore, Maryland
Session Z2: Mini-symposium on Cosmology and Dark Energy from the BOSS/SDSS II Galaxy and Quasar Surveys |
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Sponsoring Units: DAP Chair: Natalie Roe, Lawrence Berkeley National Laboratory Room: Holiday 1 |
Tuesday, April 14, 2015 3:30PM - 4:06PM |
Z2.00001: The Baryon Oscillation Spectroscopic Survey (BOSS): Dark Energy from the World's Largest Redshift Survey Invited Speaker: Daniel Eisenstein I will introduce the Baryon Oscillation Spectroscopic Survey (BOSS), the world's largest extragalactic redshift survey. The key goal of BOSS is the study of dark energy by the baryon acoustic oscillation (BAO) method, in which sound waves from the first 400,000 years after the Big Bang produce a distinct feature of calculable size in the late-time clustering of the Universe. As a part of the Sloan Digital Sky Survey III, BOSS uses spectra of 1.5 million galaxies and 160,000 high-redshift quasars to produce a detailed map of the large-scale structure of the Universe. BOSS has produced percent-level measurements of the cosmic distance scale over a range of redshifts using the BAO, sharply testing the standard cosmological model, as well as detailed probes of the large-scale gravitational dynamics of the Universe. I will describe the design and execution of the survey and the physical principles behind its major cosmological methods. [Preview Abstract] |
Tuesday, April 14, 2015 4:06PM - 4:18PM |
Z2.00002: The Baryon Oscillation Spectroscopic Survey (BOSS): Constraining dark energy with Baryon Acoustic Oscillations Florian Beutler I will present results from the final data release (DR12) of the Baryon Oscillation Spectroscopic Survey (BOSS), with particular focus on the Baryon Acoustic Oscillation (BAO) signal in the large scale clustering of galaxies. The BAO signal represents a special scale in the distribution of galaxies, which can be used to map out the expansion history of the Universe. BOSS achieved a 1\% BAO constraint at redshift z = 0.57, by far the best BAO constraint to date. BOSS also achieved a 2\% BAO constraint at redshift z = 0.32, representing the second best BAO constraint to date. In combination with constraints from the Cosmic Microwave Background (CMB), we are able to put tight constraints on several extensions of the standard cosmological model, LCDM, including the dark energy equation of state, the sum of the neutrino masses and the curvature of the Universe. I will present constraints combining the latest results from BOSS-DR12 with the Planck CMB experiment. [Preview Abstract] |
Tuesday, April 14, 2015 4:18PM - 4:30PM |
Z2.00003: Baryon Acoustic Oscillations in the Lyman-alpha forest of BOSS quasars Julian Bautista I will present the measurement of baryon acoustic oscillations (BAO) using Lyman-alpha forests of BOSS quasars. The Lyman-alpha absorption in quasar spectra traces the matter distribution along the quasar lines of sight. Using 160,000 high-redshift quasars, the BAO scale is measured at 3{\%} level in the flux correlation function. This translates into a 3{\%} accuracy measurement of the expansion rate at z $=$ 2.3, unique at this redshift. Combined with the local expansion rate, this result requires cosmological models with a dark energy component, as also inferred by previous supernovae studies. [Preview Abstract] |
Tuesday, April 14, 2015 4:30PM - 4:42PM |
Z2.00004: Baryon Acoustic Oscillations in the BOSS Quasar - Lyman Alpha Forest Cross-Correlation Carl Michael Blomqvist I will present the measurement of the baryon acoustic oscillation (BAO) scale at redshift $z=2.4$ from the correlated clustering of quasars and the intergalactic medium. The study utilizes the spectra of 190,000 high-redshift quasars ($z>2$) from the Baryon Oscillation Spectroscopic Survey (BOSS), publicly available through Data Release 12 of the Sloan Digital Sky Survey III. From the measurement of BAO in the cross-correlation of the density of quasars with the Lyman alpha forest absorption, we are able to determine the the expansion rate of the Universe 11 billion years ago and the angular diameter distance with an accuracy of nearly 3\%. By combining the results from the cross-correlation and the Lyman alpha forest auto-correlation, the precision in the measurement of the expansion rate and the angular diameter distance is improved to 2\% and 3\% accuracy, respectively. [Preview Abstract] |
Tuesday, April 14, 2015 4:42PM - 4:54PM |
Z2.00005: Cosmological implications of baryon acoustic oscillation (BAO) measurements Jose Vazquez We present constraints on cosmological parameters and tests of dark models from the combination of baryon acoustic oscillation (BAO) with cosmic microwave background (CMB) data and a reanalysis of Type Ia supernova (SN) data. In particular, we take of high-precision BAO measurements from galaxy clustering the Lyman-a forest (LyaF) in the SDSS-III Baryon Oscillation Survey (BOSS). show that the flat LCDM model, that best describes the CMB data alone, is discrepant at 95{\%} with the LyaF measurements. Hence, in order to reconcile them we consider models with more unusual histories of the dark energy, matter, or radiation components. In part we want to know what our combined data can place on interesting physical, such as neutrino masses, extra relativistic species, or dark energy that is dynamically significant at early times. But we also want to see whether any of these alternative models can resolve the discrepancy with the LyaF measurements at z $=$ 2.34. [Preview Abstract] |
Tuesday, April 14, 2015 4:54PM - 5:06PM |
Z2.00006: Next-Generation Baryon Acoustic Oscillations with eBOSS and DESI David Schlegel The next-generation of dark energy experiments using the baryon acoustic oscillation (BAO) technique will measure the expansion rate of the universe through most its history. The Extended Baryon Oscillation Spectroscopic Survey (eBOSS) will do so using a map of 1.2 million galaxies, quasars, and Lyman-$\alpha$ forest sightlines spanning redshifts 0.5 to 3. The Dark Energy Spectroscopic Instrument (DESI) will substantially increase these samples to 20 million to achieve BAO measures near the cosmic variance limit. eBOSS and DESI rely upon improved target selection and improved instrumentation relative to the precursor BOSS survey. A combination of optical and infrared imaging data is used to target of luminous red galaxies, emission line galaxies, and quasars. [Preview Abstract] |
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