<p>Yes, it is a thing.</p>

<p>Weakly Interacting Massive Particles (aka <a href="https://en.wikipedia.org/wiki/Weakly_interacting_massive_particles" rel="noreferrer">WIMPS</a>) are thought to come in matter and anti-matter forms and have a self-annihilation cross-section in order to produce the "correct" amount of dark matter (in relation to photons) that we measure today.</p>

<p>As the opening paragraph of the wikipedia article on WIMPS states - there are a number of experiments searching for the photons associated with Annihilation of WIMP anti-WIMP pairs, from which it appears that there is expected to be a <a href="https://astrobites.org/2013/03/02/the-search-for-wimp-annihilation-in-the-sun/" rel="noreferrer">neutrino and a gamma ray signature</a> or even the presence of anti-matter (positrons) that might be detected in cosmic ray experiments.</p>

<p>Of the other dark matter candidates - whether <a href="https://en.wikipedia.org/wiki/Sterile_neutrino" rel="noreferrer">sterile neutrinos</a> have an anti-particle depends on whether they are <a href="https://en.wikipedia.org/wiki/Majorana_fermion" rel="noreferrer">Majorana fermions</a> or not. The hypothetical <a href="https://en.wikipedia.org/wiki/Axion" rel="noreferrer">axion</a> I think is its own anti-particle (a chargeless boson) and there are no annihilation-type experiments for their detection that I can find.</p>

CC BY-SA 3.0
2017-03-01T12:37:30.737Z
2017-03-01T12:37:30.737Z
ProfRob
<p>It depends on the composition of the dark matter.</p>

<p>From the description I read it is clear that MACHOs (composed of normal baryonic matters) can have anti-objects, and there are also <a href="http://heasarc.gsfc.nasa.gov/docs/objects/heapow/archive/normal_galaxies/fermi_m31.html" rel="nofollow noreferrer">anti-WIMPs</a>.</p>

<p>I am not sure about the Axion, it seem to be a different beast (on par with the photon that is its own anti-particle). </p>

CC BY-SA 3.0
2017-03-01T14:00:43.680Z
a photon is considered to be its own antiparticle.
Carl Witthoft
CC BY-SA 3.0
2017-03-01T11:15:30.020Z
2017-03-01T14:15:23.587Z
2017-03-01T14:15:23.587Z
Sir Cornflakes
<p>Could there be such thing as anti-dark matter? If there is anti regular matter, why not anti-dark matter? If there is no such thing as anti-dark matter, why?</p>

<dark-matter><antimatter>
Is Anti-Dark Matter a thing?
user16049
# Is Anti-Dark Matter a thing?

(Asked by: username_0 on 2017-03-01)

Could there be such thing as anti-dark matter? If there is anti regular matter, why not anti-dark matter? If there is no such thing as anti-dark matter, why?

**Tags:** dark-matter, antimatter

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## 2 answers

### Answer by username_1 on 2017-03-01. Score: 11

Yes, it is a thing.

Weakly Interacting Massive Particles (aka [WIMPS](https://en.wikipedia.org/wiki/Weakly_interacting_massive_particles)) are thought to come in matter and anti-matter forms and have a self-annihilation cross-section in order to produce the "correct" amount of dark matter (in relation to photons) that we measure today.

As the opening paragraph of the wikipedia article on WIMPS states - there are a number of experiments searching for the photons associated with Annihilation of WIMP anti-WIMP pairs, from which it appears that there is expected to be a [neutrino and a gamma ray signature](https://astrobites.org/2013/03/02/the-search-for-wimp-annihilation-in-the-sun/) or even the presence of anti-matter (positrons) that might be detected in cosmic ray experiments.

Of the other dark matter candidates - whether [sterile neutrinos](https://en.wikipedia.org/wiki/Sterile_neutrino) have an anti-particle depends on whether they are [Majorana fermions](https://en.wikipedia.org/wiki/Majorana_fermion) or not. The hypothetical [axion](https://en.wikipedia.org/wiki/Axion) I think is its own anti-particle (a chargeless boson) and there are no annihilation-type experiments for their detection that I can find.


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### Answer by username_2 on 2017-03-01. Score: 0

It depends on the composition of the dark matter.

From the description I read it is clear that MACHOs (composed of normal baryonic matters) can have anti-objects, and there are also [anti-WIMPs](http://heasarc.gsfc.nasa.gov/docs/objects/heapow/archive/normal_galaxies/fermi_m31.html).

I am not sure about the Axion, it seem to be a different beast (on par with the photon that is its own anti-particle).

> **Comments:**
> **username_3**: a photon is considered to be its own antiparticle.  

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