David Spergel: What is the Price of Abandoning Dark Matter?
Автор: VP3 seminar
Загружено: 2021-02-10
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Seminar by David Spergel: "What is the Price of Abandoning Dark Matter? Cosmological Constraints on Alternative Gravity Theories" given for the VP3 series on 9 February 2021
Abstract: Any successful alternative gravity theory that obviates the need for dark matter must fit our cosmological observations. Measurements of microwave background polarization trace the large-scale baryon velocity field at recombination and show very strong O (1) baryon acoustic oscillations and anti-correlations between temperature and polarization on large angular scales. This constraint rules out most modified gravity theories and the modified theories that attempt to fit the data are far more complex and have more parameters than cold dark matter models. Observations of weak lensing of the cosmic microwave background are well fit by lambda-CDM and deviate from predictions of MOND-like theories. Measurements of the kSZ effect shows a correlation between galaxies and large-scale flows consistent with gravity falling as 1/r^2 rather than following a MOND-like law on large-scales.
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