On dark atoms, massive dark photons and millicharged sub-components
We present a simple model of two dark matter species with opposite millicharge that can form electrically neutral bound states via the exchange of a massive dark photon. If bound state formation is suppressed at low temperatures, a sub-dominant fraction of millicharged particles remains at late time...
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Elsevier
2020-08-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269320304056 |
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doaj-4f2a998253604b03bfc5f4aba4bb0a1c2020-11-25T03:26:53ZengElsevierPhysics Letters B0370-26932020-08-01807135601On dark atoms, massive dark photons and millicharged sub-componentsFelix Kahlhoefer0Einar Urdshals1Institute for Theoretical Particle Physics and Cosmology (TTK), RWTH Aachen University, D-52056 Aachen, Germany; Corresponding author.Institute for Theoretical Particle Physics and Cosmology (TTK), RWTH Aachen University, D-52056 Aachen, Germany; Institutt for Fysikk, NTNU, Trondheim, NorwayWe present a simple model of two dark matter species with opposite millicharge that can form electrically neutral bound states via the exchange of a massive dark photon. If bound state formation is suppressed at low temperatures, a sub-dominant fraction of millicharged particles remains at late times, which can give rise to interesting features in the 21 cm absorption profile at cosmic dawn. The dominant neutral component, on the other hand, can have dipole interactions with ordinary matter, leading to non-standard signals in direct detection experiments. We identify the parameter regions predicting a percent-level ionisation fraction and study constraints from laboratory searches for dark matter scattering and dark photon decays.http://www.sciencedirect.com/science/article/pii/S0370269320304056 |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
Felix Kahlhoefer Einar Urdshals |
| spellingShingle |
Felix Kahlhoefer Einar Urdshals On dark atoms, massive dark photons and millicharged sub-components Physics Letters B |
| author_facet |
Felix Kahlhoefer Einar Urdshals |
| author_sort |
Felix Kahlhoefer |
| title |
On dark atoms, massive dark photons and millicharged sub-components |
| title_short |
On dark atoms, massive dark photons and millicharged sub-components |
| title_full |
On dark atoms, massive dark photons and millicharged sub-components |
| title_fullStr |
On dark atoms, massive dark photons and millicharged sub-components |
| title_full_unstemmed |
On dark atoms, massive dark photons and millicharged sub-components |
| title_sort |
on dark atoms, massive dark photons and millicharged sub-components |
| publisher |
Elsevier |
| series |
Physics Letters B |
| issn |
0370-2693 |
| publishDate |
2020-08-01 |
| description |
We present a simple model of two dark matter species with opposite millicharge that can form electrically neutral bound states via the exchange of a massive dark photon. If bound state formation is suppressed at low temperatures, a sub-dominant fraction of millicharged particles remains at late times, which can give rise to interesting features in the 21 cm absorption profile at cosmic dawn. The dominant neutral component, on the other hand, can have dipole interactions with ordinary matter, leading to non-standard signals in direct detection experiments. We identify the parameter regions predicting a percent-level ionisation fraction and study constraints from laboratory searches for dark matter scattering and dark photon decays. |
| url |
http://www.sciencedirect.com/science/article/pii/S0370269320304056 |
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