Apr 12, 2000
The Future of Gravity
Dr. James Hartle, UCSB
Gravity is an immediate fact of everyday experience, but its
fundamental understanding presents some of the deepest theoretical and
experimental challenges in physics today. The modern approach to gravity as the
geometry of curved space and time is based on Einstein's general theory
of relativity. Einstein's theory stands on some of the most accurately
tested principles in science, yet one of its most basic predictions ---
gravitational waves --- has never been detected on Earth. Gravitational
physics is concerned with some of the most exotic large scale phenomena
in the universe --- black holes, pulsars, quasars, the final destiny of
stars, the Big Bang, and the universe itself. But gravitational physics
is also concerned with the microscopic quantum structure of space and time
and the unification of all forces. Gravity is thus important on both the
largest and smallest scales considered in contemporary physics. This talk
will give a broad brush survey of the present state of our understanding
of gravity and the dramatic prospects for improvements in that understanding
from new experiments in the next decade.
About the Speaker:
James Hartle has been a member of the UCSB physics
department since 1966. His scientific work is concerned with the application
of Einstein's relativistic theory of gravity --- general relativity ---
to realistic astrophysical situations, especially cosmology. He has
contributed to the understanding of gravitational waves, relativistic
stars, and black holes. He is currently interested in the quantum origin
of the universe and
the earliest moments of the big bang when the subjects of quantum
mechanics,
quantum gravity, and cosmology overlap. He is a member of the US National
Academy of Sciences, a fellow of the American Academy of Arts and Sciences,
a former Faculty Research Lecturer, and a past director of the Institute
for Theoretical Physics.
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