Neutron degenerate matter as dark matter

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Discussion Overview

The discussion revolves around the potential properties of neutron degenerate matter, particularly in the context of its viability as a candidate for dark matter. Participants explore theoretical aspects, properties of neutron liquids or solids, and implications for cosmological models.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants note a lack of information on neutron degenerate matter outside of neutron stars and inquire about its properties as a potential dark matter candidate.
  • Others argue that evidence suggests the majority of dark matter consists of non-baryonic matter, implying that neutron degenerate matter may not be a suitable candidate.
  • One participant highlights that neutron degenerate matter requires extreme densities to exist, which may not align with the observed diffuse nature of dark matter.
  • There is speculation about the potential for solid phases of neutrons and their implications for understanding dark matter and the Big Bang.
  • Some participants express interest in further research on neutron liquids or solids and their theoretical implications.

Areas of Agreement / Disagreement

Participants generally acknowledge the complexity of the topic, with some agreeing that neutron degenerate matter is unlikely to be dark matter, while others remain open to exploring its properties. The discussion contains multiple competing views and remains unresolved.

Contextual Notes

Limitations include the dependence on definitions of dark matter and the unresolved nature of the properties of neutron liquids or solids. Observational evidence regarding the clumpiness of dark matter is also noted but not fully explored.

jal
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I could not find much info on neutron degenerate matter. Only in reference to neutron stars.
http://en.wikipedia.org/wiki/Degenerate_matter
neutron degenerate matter

Has anyone looked at the possible properties of a neuton liquid or solid to determine if it could act as dark matter?
jal
 
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Hi george!
Everytime I look at your posts, I always wonder if that is your picture on a bad hair day.
hehehe
I agree, "According to the standard cosmological model, the majority of dark matter is not normal matter."
However, it appears that a neuton liquid or solid is not "normal matter".
I would like to know more on what has been postulated on a neuton liquid or solid.
jal
 
Degenerate matter such as in Neutron stars requires enormous density to exist. This can only happen in very dense collapsed objects held together by the mutual gravitational pull of the object. A lump of degenerate matter the mass (but not the size) of the Earth could not exist, it would spontaneously expand due to the nuclear repulsions of the material and no longer be in the same form.

Now, if it say we wanted to know whether Dark Matter was in fact many Neutron stars that are not emitting any radiation ( unlike say Pulsars ) we could look to surveys such as MACHO that have consistently shown that dark matter is not compact. Whatever Dark Matter is it is not clumpy, but rather a diffuse material, most likely a WIMP (Weakly Interacting Massive Particle).

In summary it has been considered whether Dark Matter could be neutron star type objects and it looks as though this has been ruled out by observations.
 
Hi Wallace!
I would hate to be the one trying to place WIMP in the periodic chart.

However, when reading about the research concerning solid hydrogen and solid neutrons, it appears that there is expectation that the next experiment could be the turning point in creating a solid phase.

Following this line of reasoning and the possibilities it would give another explanation to the big bang, and dark matter.
I'll post my speculation in my blog.
jal
 

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