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Neutron star buoyancy force
Oscillation modes in a neutron star:
"g-modes or gravity modes, have buoyancy as restoring force," Anyone care to provide some detail? |
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Neutron star buoyancy force
Dear Frisbieinstein:
On May 26, 6:34*am, Frisbieinstein wrote: Oscillation modes in a neutron star: "g-modes or gravity modes, have buoyancy as restoring force," Anyone care to provide some detail? Do you mean "neutron degeneracy pressure"? The only force between being a neutron star and becoming a black hole. David A. Smith |
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Neutron star buoyancy force
In article ,
Frisbieinstein writes: Oscillation modes in a neutron star: "g-modes or gravity modes, have buoyancy as restoring force," Anyone care to provide some detail? I don't know much about neutron stars, but gravity or bouyancy as a restoring force is probably most familiar on earth in water waves. Consider a small parcel of water that's perturbed upwards. Gravity pulls it back down but generally "overshoots," and a wave propagates outwards. The same happens in a variety of other contexts, includings earth's atmosphere. (Thus "gravity waves" are not the same as "gravitational waves.") Alternative restoring forces can be pressure (e.g., sound waves) and elastic body shear. This is important in seismic studies. I see Wikipedia has some information on s-waves and p-waves as well as gravity waves. Presumably the gravity waves on a neutron star surface aren't very high, but they could still contain a lot of energy. -- Help keep our newsgroup healthy; please don't feed the trolls. Steve Willner Phone 617-495-7123 Cambridge, MA 02138 USA |
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Neutron star buoyancy force
In sci.astro message , Fri, 3 Jun 2011
19:49:57, Steve Willner posted: I don't know much about neutron stars, but gravity or bouyancy as a restoring force is probably most familiar on earth in water waves. Consider a small parcel of water that's perturbed upwards. Gravity pulls it back down but generally "overshoots," and a wave propagates outwards. The same happens in a variety of other contexts, includings earth's atmosphere. (Thus "gravity waves" are not the same as "gravitational waves.") Alternative restoring forces can be pressure (e.g., sound waves) and elastic body shear. This is important in seismic studies. I see Wikipedia has some information on s-waves and p-waves as well as gravity waves. Presumably the gravity waves on a neutron star surface aren't very high, but they could still contain a lot of energy. Robert L Forward (Dragon's Egg; Starquake) seemed to think that a neutron star would have a rigid crust. http://en.wikipedia.org/wiki/Ne utron_star#Structure agrees. -- (c) John Stockton, near London. Web http://www.merlyn.demon.co.uk/ - FAQish topics, acronyms, and links. Correct = 4-line sig. separator as above, a line precisely "-- " (RFC5536/7) Do not Mail News to me. Before a reply, quote with "" or " " (RFC5536/7) |
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Neutron star buoyancy force
On Jun 5, 4:35*am, Dr J R Stockton
wrote: In sci.astro message , Fri, 3 Jun 2011 19:49:57, Steve Willner posted: I don't know much about neutron stars, but gravity or bouyancy as a restoring force is probably most familiar on earth in water waves. Consider a small parcel of water that's perturbed upwards. *Gravity pulls it back down but generally "overshoots," and a wave propagates outwards. *The same happens in a variety of other contexts, includings earth's atmosphere. *(Thus "gravity waves" are not the same as "gravitational waves.") Alternative restoring forces can be pressure (e.g., sound waves) and elastic body shear. *This is important in seismic studies. *I see Wikipedia has some information on s-waves and p-waves as well as gravity waves. Presumably the gravity waves on a neutron star surface aren't very high, but they could still contain a lot of energy. Robert L Forward (Dragon's Egg; Starquake) seemed to think that a neutron star would have a rigid crust. *http://en.wikipedia.org/wiki/Ne utron_star#Structure agrees. -- *(c) John Stockton, near London. * Web *http://www.merlyn.demon.co.uk/ - FAQish topics, acronyms, and links. *Correct = 4-line sig. separator as above, a line precisely "-- " (RFC5536/7) *Do not Mail News to me. * *Before a reply, quote with "" or " " (RFC5536/7) My best guess is that by buoyancy force is referring to the crust being less dense than the interior (what else?). So g-waves would be transverse waves more or less confined to the crust, while p-waves pass through the body of the star. There are also torsional waves and several other modes. Gravity waves are ripples in space time. |
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Neutron star buoyancy force
In article ,
Frisbieinstein writes: Gravity waves are ripples in space time. No, _gravitational waves_ are ripples in spacetime. Gravity waves are any waves where the restoring force is gravity or bouyancy. Not everyone uses the terminology correctly, of course. -- Help keep our newsgroup healthy; please don't feed the trolls. Steve Willner Phone 617-495-7123 Cambridge, MA 02138 USA |
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Neutron star buoyancy force
"Steve Willner" wrote in message ... | In article , | Frisbieinstein writes: | Gravity waves are ripples in space time. | | No, _gravitational waves_ are ripples in spacetime. Gravity waves | are any waves where the restoring force is gravity or bouyancy. Not | everyone uses the terminology correctly, of course. | Hey Willner! Read this below and quit being a hypocrite: | Help keep our newsgroup healthy; please don't feed the trolls. | Steve Willner Phone 617-495-7123 | Cambridge, MA 02138 USA Don't feed the ****ing trolls with gravity wave bull**** or spacetime bull****, Willner. |
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