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X-WR-CALNAME:Observing the Big Bang
X-ORIGINAL-URL:http://cosmology.nl
X-WR-CALDESC:Events for Observing the Big Bang
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DTSTART:20160327T010000
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DTSTART;TZID=Europe/Amsterdam:20160401T140000
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DTSTAMP:20260421T202436
CREATED:20160321T132122Z
LAST-MODIFIED:20160329T111918Z
UID:202-1459519200-1459533600@cosmology.nl
SUMMARY:Utrecht Spring 2016
DESCRIPTION:The April THC meeting will take place in Utrecht on April 1\, 2016 (for real\, no joke). We will have two speakers. Note that the ITF recently relocated from Minnaertgebouw to Buys Ballot Gebouw (big grey build just next to Minnaert\, 7th floor). \n14h00 – 15h00: Fabian Schmidt (MPA Garching\, Germany) \nFrom GUT scale to galaxies: probing the early universe with\nlarge-scale structure \nThe statistics of galaxies and their shapes offer fascinating\npossibilities for probing the early universe and physics of inflation.\nRealizing this goal however requires a relativistic description of the\nconnection between the initial conditions from inflation and the\nobserved galaxies today\, which is complicated both by galaxy formation\nand the difficulties of relativistic perturbation theory. Significant\nprogress has been made recently in rigorous perturbative approaches\n(capturing the physics of galaxy formation in a finite set of bias\nparameters)\, and in disentangling physical effects from “gauge\nartifacts” (for example\, regarding f_NL in single-field inflation). I\nwill review the current state of theoretical understanding and describe\nwhat insights nonlinear large-scale structure can offer into the physics\nof inflation\, both in terms of scalar modes and gravitational waves. \n16h00 – 17h00:  Daan Meerburg (CITA\, Canada) \nThe holiest grail\n\n\nI will discuss to what degree the cosmic microwave background (CMB) can be used to constrain primordial non-Gaussianity involving one tensor and two scalar fluctuations\, focusing on the correlation of one $B$-mode polarization fluctuation with two temperature fluctuations (BTT).  In the simplest models of inflation\, the tensor-scalar-scalar primordial bispectrum is non-vanishing and is of the same order in slow-roll parameters as the scalar-scalar-scalar bispectrum. I will show that constraints from an experiment like CMB-Stage IV using this observable are more than an order of magnitude better than those on the same primordial coupling obtained from temperature measurements alone. I will argue that $B$-mode non-Gaussianity opens up an as-yet-unexplored window into the early Universe\, demonstrating that significant information on primordial physics remains to be harvested from CMB anisotropies. Specifically\, if we measure any appreciable level of BTT correlation in the sky\, its source is most likely not from inflation and as such can be used to directly test the inflationary paradigm. \n\n17h00 – 18h00: Borrel
URL:http://cosmology.nl/event/utrecht-spring-2016/
LOCATION:Institute for Theoretical Physics Utrecht\,  Princetonplein 5\, Utrecht\, 3584 CE\, Netherlands
CATEGORIES:THC meeting
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