Neutron stars seem an oddity to me

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Discussion Overview

The discussion revolves around the nature of neutron stars, specifically their formation, the forces that hold them together, and the implications of their mass and size in relation to gravity and other potential forces. Participants explore theoretical aspects, including the role of degeneracy pressure and alternative binding forces.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant expresses confusion about how neutron stars can have such high mass relative to their size and questions whether neutrons have mutual attraction or if space is distorted by them.
  • Another participant asserts that neutron stars are held together by gravity, stating that mass cannot exceed a certain volume to be held together solely by gravity.
  • A later reply elaborates on the formation of neutron stars through stellar collapse and the role of degeneracy pressure between electrons and protons, noting that insufficient gravity prevents the formation of a black hole.
  • Another participant introduces the idea that neutron stars may also be held together by neutron-striction forces, suggesting that these forces could be stronger than gravitational forces, although this is noted as speculative.
  • Some participants discuss the role of rotation in preventing neutron stars from collapsing into black holes.

Areas of Agreement / Disagreement

Participants generally agree that neutron stars are formed through stellar collapse and are held together by gravity, but there is disagreement regarding the sufficiency of gravity as the sole binding force, with some proposing alternative forces. The discussion remains unresolved regarding the implications of these alternative forces.

Contextual Notes

There are limitations in the discussion regarding the assumptions made about the forces at play in neutron stars, particularly concerning the nature and strength of neutron-striction forces versus gravitational forces. The discussion also touches on the conditions under which neutron stars form and the role of degeneracy pressure, but these are not fully resolved.

wolram
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neutron stars seem an oddity to me, they seem to have
to much mass to size to be held together purly by gravity
do neutrons have mutual attraction? or is space very very
distorted by them?
 
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They ARE held togethr by garvity, you can never have enough mass to volume to be held together by gravity.
 
They ARE held togethr by garvity, you can never have enough mass to volume to be held together by gravity.
----------------------------------------------------------------------------------
so how does a neutron star become a neutron star, it seems that
size for size the neutron star should distort space time in the most
extreem way, probabaly more tightly than a black hole.
 
wolram said:
They ARE held togethr by garvity, you can never have enough mass to volume to be held together by gravity.
----------------------------------------------------------------------------------
so how does a neutron star become a neutron star, it seems that
size for size the neutron star should distort space time in the most
extreem way, probabaly more tightly than a black hole.

A neutron star becomes a neutron star via stellar collapse when the stellar remnants have enough gravity to overcome the degenarcy pressure between electrons and protons after the star goes supernova. What stops it becoming a black hole is that it doesn't have enough gravity to overcome the degenracy pressure between neutrons.
 
I had a look on google as i wasn't sure about the explanations
given, and found this,

http://xxx.arxiv.cornell.edu/abs/astro-ph/0311471

Neutron stars without gravity
Authors: V.K.Ignatovich

It is demonstrated that not only gravity, but also neutron-striction forces due to optical potential created by coherent elastic neutron-neutron scattering can hold a neutron star together. The latter forces can be stronger than gravitational ones. The effect of these forces on mass, radius and composition of the neutron star is estimated.

this maybe speculative but it does show that gravity may not be the
only contributer to the binding force of a neutron star.
 
Last edited by a moderator:
jcsd said:
What stops it becoming a black hole is that it doesn't have enough gravity to overcome the degenracy pressure between neutrons.
+ there's is often rotation..
 
jcsd said:
A neutron star becomes a neutron star via stellar collapse when the stellar remnants have enough gravity to overcome the degenarcy pressure between electrons and protons after the star goes supernova. What stops it becoming a black hole is that it doesn't have enough gravity to overcome the degenracy pressure between neutrons.
At this level, it would be degeneracy pressure of the strong nuclear force; binding force between the quarks that make up the neutrons.
 

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