QG2 - Quantum Gravity Phenomenology |
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Speaker |
Ng, Y. Jack |
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Coauthors |
Ng, Y. Jack; Edmonds, Doug; Farrah, Duncan; Ho, Chiu Man; Minic, Djordje; Takeuchi, Tatsu |
| Talk Title |
Minimal Dark Matter |
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Abstract |
Minimal dark matter (MDM) is a phenomenological model of dark matter, inspired by quantum gravity. In this talk (based on work done in collaboration with C.M. Ho and D. Minic, and also with D. Edmonds, D. Farrah, and T. Takeuchi), I review the construction of MDM by generalizing entropic gravity to de-Sitter space as is appropriate for an accelerating universe (in accordance with the $\Lambda$CDM model). The MDM mass profile depends on the baryonic mass, unlike cold dark matter models, and fits the rotation curves to a sample of 30 local spiral galaxies with a single free parameter (viz., the mass-to-light ratio for each galaxy). Then we compare dynamical and observed masses in a large sample of galactic clusters. In Newtonian analysis, the dynamical mass is about four times larger than the observed mass, whereas MDM eliminates this discrepancy. We also investigate strong gravitational lensing in the context of MDM. |
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