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Dense Dark Matter Hairs Spreading Out from Earth, Jupiter and Other Compact Bodies

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  Dense Dark Matter Hairs Spreading Out from Earth, Jupiter and Other Compact Bodies Sam Wormley <swormley1@gmail.com> - 2015-11-23 13:00 -0600
    Re: Dense Dark Matter Hairs Spreading Out from Earth, Jupiter and Other Compact Bodies jimp@specsol.spam.sux.com - 2015-11-23 19:06 +0000

#534856 — Dense Dark Matter Hairs Spreading Out from Earth, Jupiter and Other Compact Bodies

Dense Dark Matter Hairs Spreading Out from Earth, Jupiter and Other 
Compact Bodies
> http://arxiv.org/abs/1507.07009


> It is shown that compact bodies project out strands of concentrated
> dark matter filaments henceforth simply called hairs. These hairs are
> a consequence of the fine-grained stream structure of dark matter
> halos, and as such constitute a new physical prediction of ΛCDM.
> Using both an analytical model of planetary density and numerical
> simulations utilizing the Fast Accurate Integrand Renormalization
> (FAIR) algorithm (a fast geodesics calculator described below) with
> realistic planetary density inputs, dark matter streams moving
> through a compact body are shown to produce hugely magnified dark
> matter densities along the stream velocity axis going through the
> center of the body. Typical hair density enhancements are 10^7 for
> Earth and 10^8 for Jupiter. The largest enhancements occur for
> particles streaming through the core of the body that mostly focus at
> a single point called the root of the hair. For the Earth, the root
> is located at about 10^6~km from the planetary center with a density
> enhancement of around 10^9 while for a gas giant like Jupiter, the
> root is located at around 10^5~km with a enhancement of around 10^11.
> Beyond the root, the hair density precisely reflects the density
> layers of the body providing a direct probe of planetary interiors.


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#534871

Sam Wormley <swormley1@gmail.com> wrote:
> Dense Dark Matter Hairs Spreading Out from Earth, Jupiter and Other 
> Compact Bodies
>> http://arxiv.org/abs/1507.07009
> 
> 
>> It is shown that compact bodies project out strands of concentrated
>> dark matter filaments henceforth simply called hairs. These hairs are
>> a consequence of the fine-grained stream structure of dark matter
>> halos, and as such constitute a new physical prediction of ΛCDM.
>> Using both an analytical model of planetary density and numerical
>> simulations utilizing the Fast Accurate Integrand Renormalization
>> (FAIR) algorithm (a fast geodesics calculator described below) with
>> realistic planetary density inputs, dark matter streams moving
>> through a compact body are shown to produce hugely magnified dark
>> matter densities along the stream velocity axis going through the
>> center of the body. Typical hair density enhancements are 10^7 for
>> Earth and 10^8 for Jupiter. The largest enhancements occur for
>> particles streaming through the core of the body that mostly focus at
>> a single point called the root of the hair. For the Earth, the root
>> is located at about 10^6~km from the planetary center with a density
>> enhancement of around 10^9 while for a gas giant like Jupiter, the
>> root is located at around 10^5~km with a enhancement of around 10^11.
>> Beyond the root, the hair density precisely reflects the density
>> layers of the body providing a direct probe of planetary interiors.
 
Lather, rinse, repeat.
 

-- 
Jim Pennino

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