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:20210101T000000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=UTC:20211116T130000
DTEND;TZID=UTC:20211116T130000
DTSTAMP:20260424T121650
CREATED:20211112T175120Z
LAST-MODIFIED:20211112T175120Z
UID:1737-1637067600-1637067600@rpm.physics.lbl.gov
SUMMARY:Taylor Hoyt (University of Chicago) "Using Astrophysical Distance Indicators to Test Standard Cosmology"
DESCRIPTION:Abstract: \nMeasurements of the universe’s present-day expansion rate\, or the Hubble constant (H0)\, that use a Cepheid variable star calibration of Type Ia supernovae (SNe Ia) are in >4σ disagreement with values predicted by the standard\, Lambda cold dark matter (LCDM) model of the universe. In this talk\, I will review the evidence for this “Hubble Tension” and discuss in particular my work on an alternative calibration of the SNe Ia using the Tip of the Red Giant Branch (TRGB)\, a standard candle that can return distances precise to 2% when observed in ancient populations of stars. Anchored by the TRGB\, we derived in the Carnegie Chicago Hubble Program a SN value of H0 that is significantly less in tension with base LCDM (<2σ) than the Cepheid-calibrated SN H0\, which raises the question of underestimated uncertainties and softens evidence for new physics. I will identify likely causes of this Cepheid-TRGB divergence\, present paths to a potential resolution\, and highlight how the astrophysical distance scale can converge on a self-consistent\, 1% determ\n──────────\nTroy Cortez is inviting you to a scheduled Zoom meeting. \nJoin Zoom Meeting\nhttps://lbnl.zoom.us/j/95226946591?pwd=NEw3Q1FvL1grb204RUh5ckREbkxldz09 \nMeeting ID: 952 2694 6591\nPasscode: 432494\nOne tap mobile\n+16699006833\,\,95226946591#\,\,\,\,*432494# US (San Jose)\n+13462487799\,\,95226946591#\,\,\,\,*432494# US (Houston) \nDial by your location\n+1 669 900 6833 US (San Jose)\n+1 346 248 7799 US (Houston)\n+1 253 215 8782 US (Tacoma)\n+1 646 558 8656 US (New York)\n+1 301 715 8592 US (Washington DC)\n+1 312 626 6799 US (Chicago)\nMeeting ID: 952 2694 6591\nPasscode: 432494\nFind your local number: https://lbnl.zoom.us/u/adl0MwWuqw \nJoin by SIP\n95226946591@zoomcrc.com \nJoin by H.323\n162.255.37.11 (US West)\n162.255.36.11 (US East)\n115.114.131.7 (India Mumbai)\n115.114.115.7 (India Hyderabad)\n213.19.144.110 (Amsterdam Netherlands)\n213.244.140.110 (Germany)\n103.122.166.55 (Australia Sydney)\n103.122.167.55 (Australia Melbourne)\n64.211.144.160 (Brazil)\n69.174.57.160 (Canada Toronto)\n65.39.152.160 (Canada Vancouver)\n207.226.132.110 (Japan Tokyo)\n149.137.24.110 (Japan Osaka)\nMeeting ID: 952 2694 6591\nPasscode: 432494 \n──────────
URL:https://rpm.physics.lbl.gov/event/taylor-hoyt-university-of-chicago-using-astrophysical-distance-indicators-to-test-standard-cosmology/
LOCATION:Zoom Talk\, 50A-5132\, Berkeley\, ca\, 94720
END:VEVENT
END:VCALENDAR