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X-WR-CALNAME:Observing the Big Bang
X-ORIGINAL-URL:https://cosmology.nl
X-WR-CALDESC:Events for Observing the Big Bang
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DTSTART:20170326T010000
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DTSTART:20171029T010000
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DTSTART;TZID=Europe/Amsterdam:20170203T120000
DTEND;TZID=Europe/Amsterdam:20170203T180000
DTSTAMP:20260513T132356
CREATED:20161114T081352Z
LAST-MODIFIED:20170116T223248Z
UID:271-1486123200-1486144800@cosmology.nl
SUMMARY:Leiden Winter 2017
DESCRIPTION:Leiden University\, February 3\, 2017 \nCasimir room (Oort building\, Room 276\, the Institute Lorentz coffee room) \n14:00-15:00 Talk by J. Magueijo (Imperial College)\nTitle: The critical geometry of a thermal Big Bang\nAbstract:\nWe explore the space of scalar-tensor theories containing two non-conformal metrics\, and find a discontinuity pointing to a “critical” cosmological solution. Due to the different maximal speeds of propagation for matter and gravity\, the cosmological fluctuations start off inside the horizon even without inflation\, and will more naturally have a thermal origin (since there is never vacuum domination). The critical model makes an unambiguous\, non-tuned prediction for the spectral index of the scalar fluctuations: ns = 0.96478(64). Considering also that no gravitational waves are produced\, we have unveiled the most predictive model on offer. The model has a simple geometrical interpretation as a probe 3-brane embedded in an EAdS2 × E3 geometry.  \n15:00 – 15:30 Coffee \n15:30 -16:30 Talk by J. Garcia-Bellido  (IFT Madrid)\nTitle: Gravitational Waves from Primordial Black Holes as Dark Matter\nAbstract:\n20 years ago\, we predicted that primordial black holes (PBH) would form via the gravitational collapse of matter associated with peaks in the spectrum of matter fluctuations\, and that they could constitute all of the dark matter today. Last year\, we predicted the mass distribution of PBH\, which peaks at 50 Msun and whose tails could be responsible for the seeds of galaxies. LIGO has recently detected gravitational waves from the inspiraling of three black hole binaries. We propose that LIGO has actually detected dark matter in the form of PBH\, and predict that within 10 years\, an array of GW detectors (i.e. LIGO\, VIRGO\, KAGRA\, INDIGO\, etc.) could be used to determine the mass and spin distribution of PBH dark matter. Furthermore\, the stochastic GW background from inspiralling PBH will potentially be detected by LISA and PTA\, and will open a new window into the Early Universe. \n16:30- 17:30 Borrel
URL:https://cosmology.nl/event/leiden-spring-2016-2/
LOCATION:Institute Lorentz Leiden\, Niels Bohrweg 2\, Leiden\, 2333 CA\, Netherlands
CATEGORIES:THC meeting
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