Dark Energy from the Largest Galaxy Maps (SETI Talks)
Δημοσιεύθηκε στις 29 Απρ 2014
Speaker: David Schlegel, UC Berkeley
Abstract:
Dark energy is a phenomena causing the Universe to expand more rapidly
than can be explained by Einstein's laws of gravity. Its discovery
merited the 2011 Nobel Prize in Physics. The effects of dark energy
imprint on large galaxy maps.
The Baryon Oscillation Spectroscopic Survey (BOSS) on the Sloan Telescope has
mapped 200 million galaxies in 2-D, and 1.5 million galaxies and quasars
in 3-D. We measure the scale of the universe to percent-level precision at
redshifts z=2.4, z=0.6 and z=0.3, from the deceleration to acceleration
driven by dark energy. Recent maps are consistent with the "simplest"
modification of Einstein's laws, the additional of a cosmological constant.
Abstract:
Dark energy is a phenomena causing the Universe to expand more rapidly
than can be explained by Einstein's laws of gravity. Its discovery
merited the 2011 Nobel Prize in Physics. The effects of dark energy
imprint on large galaxy maps.
The Baryon Oscillation Spectroscopic Survey (BOSS) on the Sloan Telescope has
mapped 200 million galaxies in 2-D, and 1.5 million galaxies and quasars
in 3-D. We measure the scale of the universe to percent-level precision at
redshifts z=2.4, z=0.6 and z=0.3, from the deceleration to acceleration
driven by dark energy. Recent maps are consistent with the "simplest"
modification of Einstein's laws, the additional of a cosmological constant.
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Άδεια
Τυπική άδεια YouTubeΑΝΑΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 30/4/2014
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