MOND—theoretical aspects |
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| Authors: | Mordehai Milgrom |
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| Institution: | Department of Condensed Matter Physics, Weizmann Institute, Rehovot, Israel |
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| Abstract: | I discuss open theoretical questions pertaining to the modified dynamics (MOND)—a proposed alternative to dark matter, which posits a breakdown of Newtonian dynamics in the limit of small accelerations. In particular, I point the reasons for thinking that MOND is an effective theory—perhaps, despite appearance, not even in conflict with GR. I then contrast the two interpretations of MOND as modified gravity and as modified inertia. I describe two mechanical models that are described by potential theories similar to (non-relativistic) MOND: a potential-flow model, and a membrane model. These might shed some light on a possible origin of MOND. The possible involvement of vacuum effects is also speculated on. |
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| Keywords: | Cosmology The dark matter problem Galaxy dynamics |
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