Dear colleagues and students,
We are glad to invite you to the next Rome Joint Astrophysics
Colloquium (JAC) on Wednesday the 20th of October at 16:30 CEST.
Please, note the time change for this colloquium.
Join the online JAC at: https://rebrand.ly/JAC-Riess
To avoid issues with the connection, we encourage you to use the free
MS Teams App.
We would like to take this opportunity to meet in person, thus we will
be live streaming the seminar here at Physics Dept. of the Tor Vergata
University. Please, if you would like to join, fill out the following
form by Sunday October 17th. Form: https://forms.gle/DXHKWkhQ64Gx3BWMA
The Rome JAC is a joint initiative of the Physics Dept. of the Tor
Vergata University of Rome, INAF - Astronomical Observatory of Rome,
and INAF - Institute for Space Astrophysics and Planetology.
TITLE: New Determination of the Hubble Constant with Gaia EDR3,
Further Evidence of Excess Expansion
SPEAKER: Nobel Laureate Prof. A. Riess (Johns Hopkins University)
ABSTRACT: The Hubble constant remains one of the most important
parameters in the cosmological model, setting the size and age scales
of the Universe. Present uncertainties in the cosmological model
including the nature of dark energy, the properties of neutrinos and
the scale of departures from flat geometry can be constrained by
measurements of the Hubble constant made to higher precision than was
possible with the first generations of Hubble Telescope instruments. A
streamlined distance ladder constructed from infrared observations of
Cepheids and type Ia supernovae with ruthless attention paid to
systematics now provide <2% precision and offer the means to do much
better. By steadily improving the precision and accuracy of the Hubble
constant, we now see evidence for significant deviations from the
standard model, referred to as LambdaCDM, and thus the exciting
chance, if true, of discovering new fundamental physics such as exotic
dark energy, a new relativistic particle, or a small curvature to name
a few possibilities. I will review recent and expected progress, most
recently based on measurements from Gaia EDR3 .
Poster of the event is available at: https://rebrand.ly/JAC-Riess-Poster
On behalf of the Rome JAC organizing committee