Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Status Confirmed
Seminar Series P^3
Subjects astro-ph,hep-ph,hep-th
Date Tuesday 9 February 2021
Time 16:00
Institute IHP
Seminar Room Seminar via zoom https://ijclab.zoom.us/j/94900481972
Speaker's Last Name Spergel
Speaker's First Name David
Speaker's Email Address
Speaker's Institution Princeton University
Title MOND day - What is the Price of Abandoning Dark Matter? Cosmological Constraints on Alternative Gravity Theories
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.
arXiv Preprint Number
Comments This seminar will be followed by the one of Constantinos Skordis (University of Cyprus and Czech Academy of Sciences) at 16:45
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