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Thread: neutron stars make pasta

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    Default neutron stars make pasta



    'Nuclear Pasta' in Neutron Stars: New Type of Matter Found

    I'll have mine "Bolognese" please and a glass of Brunello di Montalcino too. Thanks.
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    Default Re: neutron stars make pasta

    Here is a paper on the nature of the matter:
    http://arxiv.org/pdf/1109.3511v2.pdf

    Here is a presentation. Note that you need to have (due to one axis label which has "Neutrino Energy" written in Japanese) Adobe's Japanese font:
    http://www.mpa-garching.mpg.de/hydro..._08/sonoda.pdf
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    Default Re: neutron stars make pasta

    Quote Originally Posted by not_Fritz_Argelander View Post
    Here is a paper on the nature of the matter:
    http://arxiv.org/pdf/1109.3511v2.pdf

    Here is a presentation. Note that you need to have (due to one axis label which has "Neutrino Energy" written in Japanese) Adobe's Japanese font:
    http://www.mpa-garching.mpg.de/hydro..._08/sonoda.pdf
    Do you know if there are alternative postulates that limit the spin rate?

    I'm trying to visualize pasta in a quark sauce. It would be gluten free!

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    Default Re: neutron stars make pasta

    Quote Originally Posted by kencrowder View Post
    Do you know if there are alternative postulates that limit the spin rate?

    I'm trying to visualize pasta in a quark sauce. It would be gluten free!
    I know of no alternative to slowing down neutron stars aside from magnetic braking. Raising the resistivity of the matter is what is required. "Pasta states" of neutron star matter may be only one way to do that. There might be others. It's a complicated calculation to get the pasta state.
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    Default Re: neutron stars make pasta

    Quote Originally Posted by not_Fritz_Argelander View Post
    I know of no alternative to slowing down neutron stars aside from magnetic braking. Raising the resistivity of the matter is what is required. "Pasta states" of neutron star matter may be only one way to do that. There might be others. It's a complicated calculation to get the pasta state.
    Isn't this getting to the size where quantized space/time would affect the calculations?

    I've tried to imagine how quantized space/time would affect quark properties, but it's beyond me so far.

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    Default Re: neutron stars make pasta

    Quote Originally Posted by kencrowder View Post
    I'm trying to visualize pasta in a quark sauce. It would be gluten free!
    Or is that gluon-free?

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    Default Re: neutron stars make pasta

    Quote Originally Posted by kencrowder View Post
    Isn't this getting to the size where quantized space/time would affect the calculations?

    I've tried to imagine how quantized space/time would affect quark properties, but it's beyond me so far.
    Actually no this is at a much larger scale ~ 10^(-15) meter interparticle spacing while the Planck length is ~ 10^(-35) meter. So it is still safe to do physics without needing new physics.
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    Default Re: neutron stars make pasta

    Quote Originally Posted by KeithBC View Post
    Or is that gluon-free?
    I have food allergies but I'd just die on a gluon-free diet.
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    Default Re: neutron stars make pasta

    Quote Originally Posted by not_Fritz_Argelander View Post
    Actually no this is at a much larger scale ~ 10^(-15) meter interparticle spacing while the Planck length is ~ 10^(-35) meter. So it is still safe to do physics without needing new physics.
    I was thinking that with high density and gravity, GR might make the spacing much smaller and the pasta structure calculations might depend on assumptions at the Planck scale.

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    Default Re: neutron stars make pasta

    Quote Originally Posted by kencrowder View Post
    I was thinking that with high density and gravity, GR might make the spacing much smaller and the pasta structure calculations might depend on assumptions at the Planck scale.
    Fair enough. But one does these calculations in the local inertial (Lorentz) reference frames without gravity and GR. So you get the dependency of pressure on density in SR context. Plug that into the "right hand side" or source term for the GR field equations, the stress-energy tensor, and viola! ( ) You get the Tolman Oppenheimer Volkoff equation which makes sure that GR is happy with the matter distribution.
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