BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Observing the Big Bang - ECPv5.3.1//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Observing the Big Bang
X-ORIGINAL-URL:https://cosmology.nl
X-WR-CALDESC:Events for Observing the Big Bang
BEGIN:VTIMEZONE
TZID:Europe/Amsterdam
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20160327T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20161030T010000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20160304T123000
DTEND;TZID=Europe/Amsterdam:20160304T180000
DTSTAMP:20260613T011730
CREATED:20160219T095516Z
LAST-MODIFIED:20160321T114645Z
UID:184-1457094600-1457114400@cosmology.nl
SUMMARY:Leiden Spring 2016
DESCRIPTION:12.30-14:00 Lunch (Canteen\, Oort building) \nTo simplify things\, we will have lunch in the canteen of the Oort building including the two speakers.\nSo we can all meet there. Or shortly before in room 276 of Oort building (the coffee room\, where we will be having an informal meeting with David Reitze). \n\n\n\n14.00-15.00: Talk in Collegezaal (Room C1\, Gorlaeus building)\n\nGonzalo Palma (Univ. of Chile at Santiago)\n\nThe sound speed of primordial fluctuations in supergravity inflation\n\n\nWe study the realization of slow-roll inflation in N=1 supergravities\nwith a single chiral field. If there is only one flat direction in\nfield space\, it is possible to derive a single-field effective field\ntheory (EFT) parametrized by the sound speed cs at which curvature\nperturbations propagate during inflation. The value of cs is\ndetermined by the rate of bend of the inflationary trajectory\nresulting from the shape of the F-term potential. We show that cs must\nrespect an inequality that involves the curvature tensor of the\nK”ahler manifold defining the class of supergravity\, as well as the\nratio between the mass of fluctuations ortogonal to the inflationary\ntrajectory and the Hubble expansion rate. Because in order to have a\nreliable EFT this ratio must be large\, we find that the inequality\nimplies that cs≃1. As a consequence\, EFT’s of inflation derived from\nN=1 supergravities cannot differ drastically from canonical single\nfield inflation (cs=1)\, and non-Gaussianity must be suppressed unless\nother degrees of freedom play a role during inflation. Conversely\, if\nlarge non-Gaussianity is observed\, supergravity models of inflation\nwill be disfavored.  [Based on arxiv 1601.05457] \n\n\n\n\n\n15.00-16.00 coffee break\n\n\n16.00: Joan van der Waals colloquium (Room C1\, Gorlaeus building) \n\nDavid Reitze (Caltech / Univ. of Florida)\nExecutive Director\, LIGO Laboratory\n\nObservation of Gravitational Waves from a Binary Black Hole Merger\n\n\nOn September 14\, 2015\, scientists from the LIGO Scientific\nCollaboration and the Virgo Collaboration observed the collision and\nfusion of the two black holes by directly measuring the gravitational\nwaves emitted during the collision using the LIGO detectors.  This\ndetection comes 100 years after Einstein developed his revolutionary\ngeneral theory of relativity that predicted their existence\, and 50\nyears after scientists began searching for them. \nThis discovery has truly profound implications.   Gravitational waves\nprovide unique information on the most energetic astrophysical events\,\nrevealing unique insights into the nature of gravity\, matter\, space\,\nand time. \nWe have opened a new window on the cosmos.  I will talk about how we\nmade the detection and discuss how gravitational astronomy promises to\nchange our understanding of universe. \n\nBorrel
URL:https://cosmology.nl/event/leiden-spring-2016/
LOCATION:Institute Lorentz Leiden\, Niels Bohrweg 2\, Leiden\, 2333 CA\, Netherlands
CATEGORIES:THC meeting
END:VEVENT
END:VCALENDAR