Gravitational Waves: a new window to observe the Universe
Gravitational Waves: a new window to observe the Universe
Gravitational Waves: a new window to observe the Universe
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The Classical Detection Method:<br />
Weber Bars<br />
1<br />
With l = x − xh+<br />
2<br />
cos2Ω(<br />
t − z)<br />
each particle in <strong>the</strong> bar is<br />
accelerated<br />
2<br />
d l 1 2<br />
= xΩ<br />
h cos 2Ω(<br />
t − z)<br />
2<br />
+<br />
dt 2<br />
y<br />
z<br />
x<br />
L<br />
dm = ρdx<br />
transducer<br />
Detection of <strong>the</strong> motion:<br />
How big a signal will <strong>the</strong><br />
transducer see?<br />
=<br />
h<br />
+<br />
h LQ<br />
16<br />
⇒ h = 10 −20<br />
L = 1m<br />
Q = 1.6×10 4<br />
h + = 10 −23<br />
Current bars can detect<br />
10 −16 m
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