|
Statut |
Confirmé |
|
Série |
P^3 |
|
Domaines |
astro-ph,hep-ph,hep-th |
|
Date |
Mardi 9 Fevrier 2021 |
|
Heure |
16:00 |
|
Institut |
IHP |
|
Salle |
Seminar via zoom https://ijclab.zoom.us/j/94900481972 |
|
Nom de l'orateur |
Spergel |
|
Prenom de l'orateur |
David |
|
Addresse email de l'orateur |
|
|
Institution de l'orateur |
Princeton University |
|
Titre |
MOND day - What is the Price of Abandoning Dark Matter? Cosmological Constraints on Alternative Gravity Theories |
|
Résumé |
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. |
|
Numéro de preprint arXiv |
|
|
Commentaires |
This seminar will be followed by the one of Constantinos Skordis (University of
Cyprus and Czech Academy of Sciences) at 16:45 |
|
Fichiers attachés |
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