Institute for Nuclear and Particle Astrophysics (INPA) at LBNL
The INPA Seminar weekly talks are on Fridays, starting at 12:00 pm, unless informed otherwise. The seminar talk starts with a brief presentation of the weekly scientific news. Typically, the talks conclude by 1:00 pm. The seminars are held in the Sessler Conference Room, located in Bldg. 50A- 5132.
The committee members are:
The seminar schedule for the Institute for Nuclear and Particle Astrophysics (INPA) is tentative and becomes final a few days before the Friday talk.
Please send all suggestions for future INPA talks and speakers to the INPA Committee.
To be added to the INPA News Mailing List, please contact Erica Hall.
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VIRTUAL INPA SEMINAR | Sukanya Chakrabarti (RIT)
October 23, 2020 @ 12:00 pm - 1:00 pm
Speaker: Sukanya Chakrabarti (Rochester Institute Technology)
Title: Measuring Accelerations— Near & Far
Abstract:
Recent technological advances and observational programs now make it possible for us to directly measure the Galactic acceleration experienced by stars within the Milky Way. I will discuss the traditional method of estimating Galactic accelerations and thereby the Oort limit (from which one determines the local dark matter density given the baryon budget), which uses kinematical estimates that can be inaccurate especially in parts of the Galaxy that are significantly perturbed. I will then discuss our method in using extreme precision radial velocity observations to measure the Galactic acceleration, and ongoing observational programs. I will also use compiled pulsar timing data to directly measure the Galactic acceleration, which gives us the Oort limit from the Poisson equation without making assumptions of equilibrium or spherical symmetry (as in kinematic estimates). Given the Oort limit, we then determine the local dark matter density, which has implications for direct detection experiments. I will discuss the potential for measuring dark matter sub-structure in the Milky Way with pulsar timing, and for constraining theories of gravity by combining constraints from pulsar timing and extreme precision radial velocity measurements. Finally, I will end by discussing prospects for measuring the cosmic acceleration.
Join Zoom Meeting
https://lbnl.zoom.us/j/93826947056?pwd=Q3hGOVpBSVhQcDZqS2plaitYQVB6dz09
Meeting ID: 938 2694 7056
Passcode: 123733
INPA guests from campus can now come to the lab early on Fridays. The INPA Common Room (50-5026) is reserved for our guests from 10:00 a.m. to 12:00 noon and from 1 p.m. to 5 p.m. Note that the seminars are now held in 50A-5132 to accommodate a more significant number of attendees.
CPTea Series (also known as INPA Tea Series)
The Physics Division CPTea Series invites you to an In-Person Tea Series 1st Friday of every month at 3:30 pm INPA Conference Room 50-5026.
Everyone is welcome to attend the open forum. Tea and light refreshments will be served.
INPA Common Room (50-5026)
Fridays
3:30 pm
Access to the Lab
For a shuttle pass, please email Erica Hall. The pass is only valid for the day of the seminar.