# Gravitational Waves

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http://physicsweb.org/articles/world/20/6/4/1

Although the main focus is on the detection of gravitational waves, it also serves as a concise summary of some of the key successes in the field of physics, and future areas of research.

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you don't by any chance receive, astronomy and geophysics??? they had a sterling article regarding the recent advances of gravitational astrophysics, but I can't find my issue (April (I think) 2007, Vol-48, Issue-2)I referenced it one before...thus I know the issue No e.t.c.

But I will post some more tomorrow (when I have finished my final two physics exams)....finally

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I'll look forward to it...and good luck !

Oh, and no, I don't receive astronomy and geophysics.

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right well, the exams are out of the way (finally)

Gravitational waves:

there is a neat equation that calculates power flux where:

the gravitational wave has a strain $h$

and frequency $f$

$F= \frac{c^3 \pi f^2 h^2}{G}\,\,\,\,\,\,\, Wm^{-2}$

sticking some values in to this

$h = 10^{-22}$

$f = 280 \,\,\, (Hz)$

to put this in to perspective: F is equivalent to the signal from a mobile phone at a distance of 15m or a mg -11 star (moon is ~12.7)

this may make you wonder why we don't hear more about gravitational waves, there is a simple reason for this:

Spacetime itself is very "stiff" a signal that carries a large power @ the above frequencies generates only a small strain this would be no problem if we had detectors that had a similar stiffness, we could, therefore measure the large induced stress, but currently our detectors are strain-based so need to work very hard, but a new generation of detectors are being built (discussed in the article) this is a pioneering area of physics, and I'm watching it with GREAT interest. great things are going to happen, mark my words !

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