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Planck time
created by
PaSTE
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) by
PaSTE
(3 y)
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Sat Jun 17 2000 at 20:36:15
A
unit
of
time
equal to 5.3906 x 10
-44
s, believed to be the
smallest
measurable time unit.
(
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neil
(8.2 mon)
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Sat Jun 17 2000 at 21:15:02
Named after physicist
Max Planck
, considered to be the father of
quantum mechanics
. There are two different calculations used for Planck time, which give different
value
s:
$t_p = sqrt(G\hbar/c^5)$, which is approximately 5.391E-44
second
s.
$t_p = sqrt(Gh/c^5)$, which is approximately 1.351E-43
seconds
.
G
= 6.672E-11
N
m
**2/
kg
**2
h
= 6.6262E-34
J
s
\hbar
= h / (2
pi
)
c
=2.9979
m
/
s
(
idea
) by
amsaarel
(7.6 mon)
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Tue Oct 03 2000 at 23:52:49
If we take the
general relativity
point of view and understand
gravity
as curvature of
space-time
itself, and if we also accept the
Heisenberg uncertainty principle
, which says that we can never know both the
momentum
and
position
of a particle exactly, we must accept that space-time behaves in a
quantum
manner, because otherwise we could (in principle) measure things arbitrarily accurately with the gravitational field. So theories of
quantum gravity
seem to say that time itself behaves quantum mechanically at small scales, and that there is a smallest possible time that can _exist_. Nobody claims to understand this very well yet.
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