Partially composite Dynamical Dark Matter
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Abstract
- In this paper, we consider a novel realization of the Dynamical Dark Matter (DDM) framework in which
the ensemble of particles which collectively constitute the dark matter are the composite states of a strongly
coupled conformal field theory. Cosmological abundances for these states are then generated through
mixing with an additional, elementary state. As a result, the physical fields of the DDM dark sector at low
energies are partially composite—i.e., admixtures of elementary and composite states. Interestingly, we
find that the degree of compositeness exhibited by these states varies across the DDM ensemble. We
calculate the masses, lifetimes, and abundances of these states—along with the effective equation of state of
the entire ensemble—by considering the gravity dual of this scenario in which the ensemble constituents
are realized as the Kaluza-Klein states associated with a scalar propagating within a slice of fivedimensional anti-de Sitter (AdS) space. Surprisingly, we find that the warping of the AdS space gives rise to
parameter-space regions in which the decay widths of the dark-sector constituents vary nonmonotonically
with their masses. We also find that there exists a maximum degree of AdS warping for which a
phenomenologically consistent dark-sector ensemble can emerge. Our results therefore suggest the
existence of a potentially rich cosmology associated with partially composite DDM.
| Title | Partially composite Dynamical Dark Matter |
|---|---|
| Creator | Thomas, Brooks |
| Gherghetta, T. | |
| Buyukdag, Y. | |
| Dienes, K. R. | |
| Publisher | Physical Review D |
| Academic Department | Physics |
| Division | Natural Sciences |
| Organization | Lafayette College |
| Date Issued | April 30, 2020 |
| Date Available | 2020-04-30 |
| Type | Article |
| Language | English |
| Bibliographic Citation | Buyukdag, Y., et al (2020 Apr 30) "Partially composite Dynamical Dark Matter." Physical Review D 101 (7): 075074 |
| Standard Identifier | Handle 10385/qr46r129f |
| DOI 10.1103/PhysRevD.101.075054 | |
| Permalink | http://hdl.handle.net/10385/qr46r129f |
| Rights Statement |
Creative Commons - Attribution
|
| Rights Holders | The American Physical Society |
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| File | Thomas-PhysicalReviewD-vol101-2020-article075054.pdf | Uploaded 2020-04-30 | Public | Download |
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