Bulletin of the American Physical Society
2006 APS April Meeting
Saturday–Tuesday, April 22–25, 2006; Dallas, TX
Session W1: Shedding Light on Dark Energy |
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Sponsoring Units: DPF DAP Chair: Natalie Roe, Lawrence Berkeley National Laboratory Room: Hyatt Regency Dallas Landmark A |
Tuesday, April 25, 2006 10:45AM - 11:21AM |
W1.00001: Cosomolgy using Type Ia SNe from the Supernova Legacy Survey Invited Speaker: The Supernova Legacy Survey (SNLS) is a five-year program which will use around 700 high-redshift Type Ia Supernovae (SNe Ia) to constrain the average equation-of-state of dark energy, w. The survey uses griz rolling light-curves sampled every 3-4 days in dark or gray time, with SN types and redshifts determined from follow-up spectroscopy using Gemini, the VLT, and Keck telescopes. The first results from the survey indicate that in a flat universe Omega\_Matter=0.263 +/- 0.042, and w=-1.02 +/- 0.09 (stat) when combined with the constraint from baryon acoustic oscillations. We give an update on the current status of the survey, including evidence that the rates and properties of SNe Ia vary as a function of their progenitor stellar population. Using a two-component model, we constrain the expected evolution of average SN Ia properties with redshift and place limits on progenitor models. [Preview Abstract] |
Tuesday, April 25, 2006 11:21AM - 11:57AM |
W1.00002: Theoretical Overview of Dark Energy Invited Speaker: Recent developments in understanding the influence of dark energy dynamics on cosmological observables have led to several insights in how to reveal the nature of dark energy. This includes the categorization of many physics models for the dark energy into either freezing or thawing behavior, recognition of differences from the inflation scenario, and methods for robustly distinguishing a physical dark energy from a modification of gravitational physics. These have definite consequences for experiment design, such as prescription of the relative precision needed for dynamics measurements, the need for probes of both cosmological expansion and large scale structure growth, and how dark energy microphysics can contribute a theory-induced systematics limit on many techniques. [Preview Abstract] |
Tuesday, April 25, 2006 11:57AM - 12:33PM |
W1.00003: Weak Gravitational Lensing and Dark Energy Invited Speaker: Weak gravitational lensing is a means of measuring the expansion history of the Universe and the growth of the structures contained within. Both quantities are altered by the existence of dark energy or by alterations to General Relativity. I will describe the methods, potential, and limitations of the weak lensing method, and the practical steps necessary for its full exploitation. [Preview Abstract] |
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