BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//LBNL Physics Division Research Progress Meetings - ECPv6.8.3//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:LBNL Physics Division Research Progress Meetings
X-ORIGINAL-URL:https://rpm.physics.lbl.gov
X-WR-CALDESC:Events for LBNL Physics Division Research Progress Meetings
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:UTC
BEGIN:STANDARD
TZOFFSETFROM:+0000
TZOFFSETTO:+0000
TZNAME:UTC
DTSTART:20200101T000000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=UTC:20200227T160000
DTEND;TZID=UTC:20200227T170000
DTSTAMP:20260417T161303
CREATED:20190909T190342Z
LAST-MODIFIED:20200220T180430Z
UID:1218-1582819200-1582822800@rpm.physics.lbl.gov
SUMMARY:Ken Van Tilburg (NYU/IAS) "The Structure of Dark Matter on Small Scales"
DESCRIPTION:ABSTRACT:\n\nHalometry—mapping out the spectrum\, location\, and kinematics of nonluminous structures inside the Galactic halo—can be realized via effects that variable weak gravitational lensing induces on the proper motions of stars and other luminous background sources. Modern astrometric surveys provide unprecedented positional precision along with a leap in the number of cataloged objects. Astrometry thus offers a new and sensitive probe of collapsed dark matter structures over a wide mass range\, from one millionth to several million solar masses. It opens up a window into the spectrum of primordial density fluctuations with very small comoving wavenumbers\, scales hitherto poorly constrained.\n\nI will outline a program of detection strategies for dark matter substructure based on time-domain weak gravitational lensing\, after summarizing existing techniques and constraints. I will present first results from analyses based on Gaia’s second data release. Finally\, I will show that minimal models of axion-like dark matter naturally produce dense small-scale structures which can probed by the aforementioned astrometric lensing techniques.
URL:https://rpm.physics.lbl.gov/event/reserved-62/
LOCATION:Zoom Talk\, 50A-5132\, Berkeley\, ca\, 94720
END:VEVENT
END:VCALENDAR