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Astrophysics, Gravitation and Cosmology Seminar - "Dark energy and the Hubble Tension"

Event Type
Seminar/Symposium
Sponsor
Department of Physics
Location
464 Loomis Lab
Date
Sep 25, 2019   12:00 pm  
Speaker
Jeremy Sakstein, University of Pennsylvania
Contact
Betsy Greifenkamp
E-Mail
greifenk@illinois.edu
Views
26
Originating Calendar
Physics - Astrophysics, Gravitation, and Cosmology Seminar

Modified gravity theories that can drive the cosmic acceleration predict fifth forces that are hidden in the Milky Way using screening mechanisms. It is possible that other galaxies could be unscreened depending on their environment. In this talk, I will show how unscreening Cepheid stars in other galaxies could alter the calibration of the distance ladder, alleviating the tension between local and CMB measurements of the Hubble constant.

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