Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session X04: Cosmology from Cosmic SurveysInvited
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Sponsoring Units: DAP Chair: Joshua Frieman, Fermilab, University of Chicago Room: Sheraton Plaza F |
Tuesday, April 16, 2019 10:45AM - 11:21AM |
X04.00001: Cosmology from the Dark Energy Survey Invited Speaker: Daniel Gruen The Dark Energy Survey is testing our cosmological model with multiple probes on the optical imaging data it has recently finished collecting. It has simultaneously constrained the cosmic expansion history (using Type-Ia Supernovae and Baryonic Acoustic Oscillations) and the linear and non-linear growth of structure in the Universe. I will present our latest results from these largely independent experiments, with a focus on the accurate measurement and interpretation of higher-order structure from gravitational lensing. A joint view of these statistics and the rapidly increasing and improving data has allowed DES to begin to deliver on the promise of optical surveys as a leading probe of cosmology. |
Tuesday, April 16, 2019 11:21AM - 11:57AM |
X04.00002: Marshak Lectureship: Cosmological constraints from the Subaru Hyper Suprime-Cam Survey first year data Invited Speaker: Surhud More How does dark energy affect the growth of cosmic structure? The Hyper Suprime-Cam Survey conducted from the Subaru telescope is a 1400 square degree imaging survey of the sky which aims to answer this question. The wide field of view of Subaru, the unprecedented survey depth, combined with the excellent imaging quality, makes it ideal to study the shapes of millions of galaxies in a large part of the sky. Gravitational lensing, the bending of light due to gravity, induces tiny distortions in the shapes of these galaxies. These tiny distortions together reveal the matter distribution and can be used to measure the growth of cosmic structure. I will report on the cosmology results from the first year of the HSC survey covering 140 square degrees on the sky. We measure and model the cosmic shear power spectrum and constrain the amplitude of density fluctuations in the Universe today. Although our results are consistent with the fluctuations evolved from the cosmic microwave background observations of the Planck satellite, all cosmic shear surveys, including ours, show tantalizing hints of the growth of structure being slower than expected from the concordance cosmological model. I will discuss the implications and the future prospects of confirming or ruling out these deviations. |
Tuesday, April 16, 2019 11:57AM - 12:33PM |
X04.00003: Cosmological Constraints from the Kilo Degree Survey Invited Speaker: Shahab Joudaki I will present the latest tomographic cosmic shear measurements from the Kilo Degree Survey (KiDS), and the resulting cosmological parameter constraints. I will explore the sensitivity of the parameter constraints to the systematic uncertainties and improvements that come from incorporating overlapping near-infrared data from VIKING. I will also discuss the combined analysis of weak lensing tomography and overlapping redshift-space galaxy clustering from KiDS and the spectroscopic surveys of 2dFLenS, BOSS, and GAMA, with a focus on improvements to systematics mitigation and parameter constraints in standard and extended cosmologies. |
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