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Weakly Interacting Sub-eV Particles

Enthalpy
in Astronomy and Cosmology

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Hello you all!

 

Weakly Interacting Sub-eV Particles (WISP) are proposed as a dark mass candidate - similar to WIMP but lighter, from the very little I've read.

 

Though, I don't see how they could concentrate at galaxies to explain the missing galactic mass. Even if they're 3K cold (6e-23 J) and 1eV massive (2e-36 kg), their mean speed is ~8000km/s, much more than a galactic escape speed.

 

Would you know more? Like:

- Candidate as dark mass elsewhere, not concentrated at galaxies ?

- Subject to forces other than gravitation that confine them in galaxies ?

- Colder than the electromagnetic background ?

- Other ideas ?

 

Thanks!

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