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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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TZID:Europe/Amsterdam
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DTSTART:20190331T010000
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DTSTART:20191027T010000
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DTSTART;TZID=Europe/Amsterdam:20190607T133000
DTEND;TZID=Europe/Amsterdam:20190607T170000
DTSTAMP:20260517T065306
CREATED:20190309T074530Z
LAST-MODIFIED:20190605T093820Z
UID:408-1559914200-1559926800@cosmology.nl
SUMMARY:Amsterdam Spring 2019
DESCRIPTION:Amsterdam\, June 7th. The meeting will take place at Nikhef\, Science Park 105\, 1098 XG Amsterdam\, room H331. \nProgram \n13:30 – 14:30: Talk by David Weir (Nottingham University) \nTitle:Vorticity\, kinetic energy\, and suppressed gravitational wave production in strong first order phase transitions \nAbstract: \nIn the Standard Model\, electroweak symmetry breaking is a crossover. In many extensions\, the phase transition can be of first order – even strongly so. The resulting phase transition can then be a substantial source of gravitational waves. For a phase transition at or around the electroweak scale\, these gravitational waves may be detectable by future or planned missions\, such as LISA. This can indirectly provide a probe of particle physics beyond the Standard Model\, complementary to future colliders. In this talk I will discuss the physics that will make this possible and present some new simulation results for strong phase transitions\, showing that vorticity is generated during the phase transition and substantial reheating can occur in front of the bubbles. This slows them down and\, in certain cases\, can suppress the generation of gravitational waves from the phase transition. \n14:30 – 15:00: Coffee \n15:00 – 16:00: Talk by Lars Aalsma(UvA) \nTitle: De Sitter Space in the Unruh State\n \nAbstract: \nIn this talk\, I will discuss some recent work done in collaboration with Maulik Parikh and Jan Pieter van der Schaar in which we constructed a new quantum state for de Sitter space: the Unruh-de Sitter state. This state is the analogue of the Unruh state describing an evaporating black hole. I will show how to construct this state and calculate the stress tensor in an explicit two-dimensional example. After generalizing the computation to four dimensions I will analyze backreaction and show that de Sitter space exhibits a quantum instability in the Unruh state. Finally\, I will comment on the possible implications of these results on (inflationary) cosmology. \n16:00 – 17:00: Talk by Jorinde Van De Vis (Nikhef) \nTitle: An effective approach to electroweak baryogenesis\n \nAbstract: \nThe asymmetry between matter and antimatter is a one of the big outstanding questions of particle physics and cosmology. In this talk\, I will argue that electroweak baryogenesis is an interesting mechanism to generate the baryon asymmetry. The new physics needed for electroweak baryogenesis come into play at a relatively low scale and can thus be tested in experiment.\nIn the first part of this talk I will explain whether electroweak baryogenesis can be studied in the model-independent framework of the Standard Model Effective Field Theory. In the second part I will make a comparison between the value of the asymmetry resulting from CP-violating interactions involving different Standard Model particles.\n 
URL:http://cosmology.nl/event/amsterdam-spring-2019/
LOCATION:NIKHEF\, Science Park 105\, Amsterdam\, 1098 XG
CATEGORIES:THC meeting
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