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DTSTART:20180311T100000
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DTSTART;TZID=America/Los_Angeles:20180517T160000
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DTSTAMP:20260413T210913
CREATED:20180423T155352Z
LAST-MODIFIED:20180423T155352Z
UID:836-1526572800-1526576400@rpm.physics.lbl.gov
SUMMARY:Chris Fassnacht (UC Davis) "Cosmological parameters from strong gravitational lenses"
DESCRIPTION:Abstract:\nRecent measurements of the Hubble Constant (H_0) through distance\nladder techniques have revealed a noticeable tension with the\nPlanck H_0 value that was obtained under the assumption of the cosmological\n“standard model”\, i.e.\, a flat Lambda cold dark matter cosmology. Is this\ntension an indication that modifications to the standard model are\nnecessary\, or is it the sign of unknown systematic effects in one or\nboth of the techniques? To address this question requires additional\nhigh-precision measurements with techniques that are independent of\nthe distance ladder. The time delay strong lensing technique\, in\nwhich gravitational lensing by a massive galaxy produces multiple\nimages of a time-variable quasar\, fulfills these requirements. I will\npresent recent results from the H0licow program\, in which the analysis\nof just three time-delay strong lenses has produced a 3.8% measurement\nof H_0\, and discuss the implications for other cosmological parameters\,\nincluding those describing dark energy. I will also discuss the\nfuture prospects of this technique in the era of large sky surveys and\nextremely large telescopes.
URL:https://rpm.physics.lbl.gov/event/chris-fassnacht-uc-davis-tba/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
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