Sound waves in a neutron star

Spherical vibrations of a neutron star. It seems to me that the
intense gravity could have a strong effect on sound waves in a neutron
star. Is this correct?

I also wonder if there would be relativistic effects in a rapidly
rotating neutron star. Such a star can have a rotational velocity of
up to perhaps 0.16c at the equator. Since I read that sound moves at
about 0.5c in the interior (it depends on the temperature) then could
relativistic effects cause sound waves to propagate asymmetrically?

"Patrick Powers" wrote in message
...
| Spherical vibrations of a neutron star. It seems to me that the
| intense gravity could have a strong effect on sound waves in a neutron
| star. Is this correct?
|
Oh yeah, definitely it could. It might, too. In fact it should, maybe.

| I also wonder if there would be relativistic effects in a rapidly
| rotating neutron star.

Do you really? How nice that you wonder. Do you often wonder,
or is it a one-time occurrence? I wonder what to have for lunch
sometimes. Do you wonder if there would be relativistic effects in
a rapidly rotating microwave oven? If so, could it maybe influence
my decision on what to eat, perhaps, possibly, maybe, could be,
might be?

Such a star can have a rotational velocity of
| up to perhaps 0.16c at the equator.

Can, up to, perhaps, eh? Well, as long as we are into "up to"
it could perhaps possibly maybe might be up to 2pi radians per
period, perhaps.

| Since I read that sound moves at
| about 0.5c in the interior

**** my old boots! You can read? Incredible. Are you absolutely
certain? Surely that's not possible with a ****ing drooling imbecile
such as you?

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Le 31/05/11 14:05, Androcles a écrit :
**** my old boots! You can read? Incredible. Are you absolutely
certain? Surely that's not possible with a ****ing drooling imbecile
such as you?


Insulting people is the favorite pass time of this troll.
He feels better after he writes stuff like that. Specially
when he didn't have his meds...

Just ignore him, or better, filter his posts.

jacob

Le 31/05/11 13:37, Patrick Powers a écrit :
Spherical vibrations of a neutron star. It seems to me that the
intense gravity could have a strong effect on sound waves in a neutron
star. Is this correct?

I also wonder if there would be relativistic effects in a rapidly
rotating neutron star. Such a star can have a rotational velocity of
up to perhaps 0.16c at the equator. Since I read that sound moves at
about 0.5c in the interior (it depends on the temperature) then could
relativistic effects cause sound waves to propagate asymmetrically?

There are many studies in the literature about this. For instance:
http://www.ioffe.ru/astro/DTA/gusakov/sndhyp.pdf

On May 31, 11:21*pm, jacob navia wrote:
Le 31/05/11 13:37, Patrick Powers a écrit :

Spherical vibrations of a neutron star. *It seems to me that the
intense gravity could have a strong effect on sound waves in a neutron
star. *Is this correct?

I also wonder if there would be relativistic effects in a rapidly
rotating neutron star. *Such a star can have a rotational velocity of
up to perhaps 0.16c at the equator. *Since I read that sound moves at
about 0.5c in the interior (it depends on the temperature) then could
relativistic effects cause sound waves to propagate asymmetrically?

There are many studies in the literature about this. For instance:http://www.ioffe.ru/astro/DTA/gusakov/sndhyp.pdf

I took a look at a few of these. It seems to me that generally the
mathematics are so hairy that they limit themselves to the non-
rotating case.

On May 31, 10:43*pm, Patrick Powers wrote:

I took a look at a few of these. *It seems to me that generally the
mathematics are so hairy that they limit themselves to the non-
rotating case.
However, "star quakes" have been detected from neutron stars. These
star quakes generally cause the spin of the neutron star to change. So
if one equates "star quakes" with "sound waves", it appears that the
rotation of the neutron star does interact with the sound waves.
Experimentally, it appears that the issue of rotation has already
been addressed.

Darwin123 wrote in news:e1af0c73-2d9a-49a0-95bf-
:

On May 31, 10:43*pm, Patrick Powers wrote:

I took a look at a few of these. *It seems to me that generally the
mathematics are so hairy that they limit themselves to the non-
rotating case.
However, "star quakes" have been detected from neutron stars. These
star quakes generally cause the spin of the neutron star to change. So
if one equates "star quakes" with "sound waves", it appears that the
rotation of the neutron star does interact with the sound waves.
Experimentally, it appears that the issue of rotation has already
been addressed.


That's not 'sound waves', that's 'a mountain shifting position and changing
the angular momentum distribution'.

On 6/1/2011 10:26 PM, eric gisse wrote:
wrote in news:e1af0c73-2d9a-49a0-95bf-
:
However, "star quakes" have been detected from neutron stars. These
star quakes generally cause the spin of the neutron star to change. So
if one equates "star quakes" with "sound waves", it appears that the
rotation of the neutron star does interact with the sound waves.
Experimentally, it appears that the issue of rotation has already
been addressed.


That's not 'sound waves', that's 'a mountain shifting position and changing
the angular momentum distribution'.

If it's quaking, it's doing that because of sound waves. It doesn't
matter if the cause is because of external features shifting, or for
internal features shifting.

Yousuf Khan

On Jun 1, 8:29*pm, Yousuf Khan wrote:
On 6/1/2011 10:26 PM, eric gisse wrote:

*wrote in news:e1af0c73-2d9a-49a0-95bf-
:
* * However, "star quakes" have been detected from neutron stars. These
star quakes generally cause the spin of the neutron star to change. So
if one equates "star quakes" with "sound waves", it appears that the
rotation of the neutron star does interact with the sound waves.
* * *Experimentally, it appears that the issue of rotation has already
been addressed.

That's not 'sound waves', that's 'a mountain shifting position and changing
the angular momentum distribution'.

If it's quaking, it's doing that because of sound waves. It doesn't
matter if the cause is because of external features shifting, or for
internal features shifting.

* *Yousuf Khan

See the new Brightest Flash Ever Recorded thread.

On Jun 1, 10:26*pm, eric gisse wrote:

That's not 'sound waves', that's 'a mountain shifting position and changing
the angular momentum distribution'.
The redistribution was associated with quasiperiodic oscillations. In
the broadest sense, these are sound waves. Here is a link followed by
a quote that indicates that there were oscillations involved.
http://www.space.com/1321-biggest-starquake.html
“Combing through data from NASA's Rossi X-ray Timing Explorer, a team
of astronomers has identified oscillations in the X-ray emission of
SGR 1806-20. These rapid fluctuations, which began 3 minutes after
the starquake and trailed off 10 minutes later, had a frequency of
94.5 Hertz.”