※ [本文轉錄自 NCTU-STAT98G 看板 #1Di0V5_f ]
作者: MoshiX2 (阿威) 看板: NCTU-STAT98G
標題: [演講] 4/22(五) 統研所專題演講
時間: Thu Apr 21 18:32:34 2011
題 目：The Geometric Structure of Space-time
主講人：許文郁教授(清華大學統計所)
時 間：100年4月22日(星期五)上午10:40-11:30
(上午10:20-10:40茶會於交大統計所429室舉行)
地 點：交大綜合一館427室
Abstract
In the late 1990s, observations of Type Ia supernovae led to the astounding
discovery that the universe is expanding at an accelerating rate. The
explanation of this anomalous acceleration has been one of the great
challenges in physics since that discovery. In this talk, I will present
cosmological models [1,2,3] that explain the cosmic acceleration via the
geometric structure of space-time, without invoking mysterious, unseen “dark
energy”. In this geometric structure of space-time, the roles of time, space
and mass are related in new kind of relativity. There are four distinguishing
features of these models: 1) the speed of light and the gravitational “
constant” are not constant, but vary with the evolution of the universe, 2)
time has no beginning and no end; i.e., there is neither a big bang nor a big
crunch singularity, 3) the spatial section of the universe is a 3-sphere,
ruling out the possibility of a flat or hyperboloid geometry, and 4) the
universe experiences phases of both acceleration and deceleration. One of
these models is selected and tested against current cosmological observations
of Type Ia supernovae, and is found to fit the redshift-luminosity distance
data quite well.
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