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Browsing by Author "Ng, Y. J."

Now showing 1 - 3 of 3
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    Dark matter, infinite statistics, and quantum gravity
    Ho, C. M.; Minic, Djordje; Ng, Y. J. (American Physical Society, 2012-05-21)
    We elaborate on our proposal regarding a connection between global physics and local galactic dynamics via quantum gravity. This proposal calls for the concept of MONDian dark matter which behaves like cold dark matter at cluster and cosmological scales but emulates modified Newtonian dynamics (MOND) at the galactic scale. In the present paper, we first point out a surprising connection between the MONDian dark matter and an effective gravitational Born-Infeld theory. We then argue that these unconventional quanta of MONDian dark matter must obey infinite statistics, and the theory must be fundamentally nonlocal. Finally, we provide a possible top-down approach to our proposal from the matrix theory point of view.
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    Modified Dark Matter in Galaxies and Galaxy Clusters
    Edmonds, Douglas; Farrah, D.; Minic, Djordje; Ng, Y. J.; Takeuchi, Tatsu (2017-12)
    Modified Dark Matter (MDM) is a phenomenological model of dark matter, inspired by gravitational thermodynamics, that naturally accounts for the universal acceleration constant observed in galactic rotation curve data; a critical acceleration related to the cosmological constant, $\Lambda$, appears as a phenomenological manifestation of MDM. We show that the resulting mass profiles, which are sensitve to $\Lambda$, are consistent with observations at the galactic and galaxy cluster scales. Our results suggest that dark matter mass profiles contain information about the cosmological constant in a non-trivial way.
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    Modified Dark Matter: Relating Dark Energy, Dark Matter and Baryonic Matter
    Edmonds, Douglas; Farrah, Duncan; Minic, Djordje; Ng, Y. J.; Takeuchi, Tatsu (2017-09-13)
    Modi ed dark matter (MDM) is a phenomenological model of dark matter, inspired by gravitational thermodynamics. For an accelerating Universe with positive cosmological constant ( ), such phenomenological considerations lead to the emergence of a critical acceleration parameter related to . Such a critical acceleration is an effective phenomenological manifestation of MDM, and it is found in correlations between dark matter and baryonic matter in galaxy rotation curves. The resulting MDM mass profiles, which are sensitive to , are consistent with observational data at both the galactic and cluster scales. In particular, the same critical acceleration appears both in the galactic and cluster data fits based on MDM. Furthermore, using some robust qualitative arguments, MDM appears to work well on cosmological scales, even though quantitative studies are still lacking. Finally, we comment on certain non-local aspects of the quanta of modified dark matter, which may lead to novel non-particle phenomenology and which may explain why, so far, dark matter detection experiments have failed to detect dark matter particles.