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Refining the free function of MOND

Dark Matter and Alternative Gravities. Refining the free function of MOND. Workshop Program. Day 1: Galaxies and Solar System Day 2: Large Scale and Lensing Day 3: Satellites and Challenges for all theories. Day 1: Galaxies. The acceleration discrepancy problem Large halos of DM

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Refining the free function of MOND

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  1. Dark Matter and Alternative Gravities Refining the free function of MOND Workshop Program

  2. Day 1: Galaxies and Solar System Day 2: Large Scale and Lensing Day 3: Satellites and Challenges for all theories

  3. Day 1: Galaxies • The acceleration discrepancy problem • Large halos of DM • CDM: Large Scale Structure and best candidate

  4. Is the missing satellite problem solved? • How do we solve the cusp problem in CDM? • Is WDM the solution? (cf. e.g. dSph) • What about the -WDM cosmological model? • Wiggles of the rotation curves?

  5. With DM, how do we explain the « order » encapsulated in the well-known MOND formula?  (g/a0) g = gN baryons with (x) = x for x « 1 (MONDian regime) (x) = 1 for x »1 (Newtonian regime) • Is this going to end as an equivalent of Titus Bode’s law for the solar system? • If not, could it be the signature of exotic DM somehow interacting with baryons? Are there candidates?

  6. Day 1: Solar System • Pioneer anomaly: end of gravity as we know it? • Thermal emission anisotropy of the spacecraft? • Is acceleration different for different orbits? => Modified Inertia? End of « metric » gravity?

  7. Day 2: Large Scale • Are massive galaxies at very high redshift a challenge to standard hierarchical model? • CMB anisotropies: the most serious challenge to any modified gravity theory? • Galaxy clusters: failure of the MOND formula + lensing of interacting clusters : => surviving « hybrid » theory? (e.g. BSTV)

  8. Dark Energy: do we know enough about supernovae? (models don’t explode, while they are the only direct evidence) • Isn’t there too much dark energy in a flat TeVeS Universe, in order to fit supernovae? Running cosmological constant? • Non-MOND modifications of the left-hand side of Einstein equation? Is unification with DM possible?

  9. Day 2: Lensing • Is the scatter observed in the lenses gravity vs. lenses baryonic content real, or due to too many uncertainties in the analysis? • If confirmed, this scatter cannot be fitted by any modified gravity theory • What about lensing in conformal gravity?

  10. Day 3: Galactic Satellites • MOND: Dwarf spheroidals need DM if their size is primarily determined by tides, as distant globular clusters are • Not all internal velocity dispersion profiles of dSph are compatible with the MOND formula (bigger problem than in galaxy clusters)

  11. DM: cusps DM: wiggles of RC’s MOND: CMB, galaxy clusters,  function (precise M/L could fix  and rule TeVeS out) E.g. in conformal gravity, how do we handle complex geometries? What happens to dynamical friction in any modified gravity theory? Can a hybrid theory save e.g. the issue for dSph? Day 3: Challenges ETC.

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