Could dark matter have gamma-ray absorption lines?


by johne1618
Tags: absorption, dark, gammaray, lines, matter
johne1618
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#1
Mar30-12, 06:07 AM
P: 355
Are there sky surveys that perform gamma-ray absorption spectroscopy?

I was wondering if dark matter might absorb gamma radiation.

I have done a simple Bohr-atom type calculation assuming a dark matter model of a bound state of a North and South magnetic monopole and found a Rydberg energy of about a MeV. I assume that the mass of the monopoles is 1 Tev; masses less than this limit have apparently been excluded by particle accelerator experiments (to a confidence of 95%). I also assume that the monopoles have the minimum magnetic charge.
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johne1618
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#2
Mar30-12, 08:06 AM
P: 355
Quote Quote by johne1618 View Post
I have done a simple Bohr-atom type calculation assuming a dark matter model of a bound state of a North and South magnetic monopole and found a Rydberg energy of about a MeV. I assume that the mass of the monopoles is 1 Tev; masses less than this limit have apparently been excluded by particle accelerator experiments (to a confidence of 95%). I also assume that the monopoles have the minimum magnetic charge.
Actually I retract this calculation - I think I got my fine structure constant upside-down! And also GUT theories think the mass of the monopole is probably bigger than [itex]10^{16}[/itex] GeV!
Chalnoth
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#3
Mar31-12, 02:18 AM
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Quote Quote by johne1618 View Post
Are there sky surveys that perform gamma-ray absorption spectroscopy?

I was wondering if dark matter might absorb gamma radiation.

I have done a simple Bohr-atom type calculation assuming a dark matter model of a bound state of a North and South magnetic monopole and found a Rydberg energy of about a MeV. I assume that the mass of the monopoles is 1 Tev; masses less than this limit have apparently been excluded by particle accelerator experiments (to a confidence of 95%). I also assume that the monopoles have the minimum magnetic charge.
It's somewhat difficult to do spectroscopy in general with gamma rays, as least where astronomy is concerned. The number counts are just too low. But I think the general expectation is that we'd see gamma rays from dark matter annihilation, but that the dark matter won't do much if any absorption.

That said, I don't think that magnetic monopoles can work as dark matter. They'd interact far too strongly with one another and normal matter.

Chalnoth
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#4
Mar31-12, 02:18 AM
Sci Advisor
P: 4,721

Could dark matter have gamma-ray absorption lines?


Quote Quote by johne1618 View Post
Actually I retract this calculation - I think I got my fine structure constant upside-down! And also GUT theories think the mass of the monopole is probably bigger than [itex]10^{16}[/itex] GeV!
Quite possibly!


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