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SUMMARY:Plenary talk: Primary thermalisation mechanism of Early Universe o
 bserved from Faraday-wave scattering on liquid-liquid interfaces - Silke W
 einfurtner (University of Nottingham)
DTSTART:20221205T103000Z
DTEND:20221205T113000Z
UID:TALK184181@talks.cam.ac.uk
DESCRIPTION:Parametric instabilities can be responsible for dramatic event
 s\, from the collapse of bridges and rolling of ships at sea to the therma
 lisation of our universe following cosmic inflation\, 13.8 billion years a
 go. In a leading theory for the thermalisation of the Early Universe\, kno
 wn as preheating\, broad parametric resonance efficiently transfers the en
 ergy of the inflaton field to other fields and particles\, thus producing 
 the hot plasma required for the Big Bang theory to proceed. However\, dire
 ct observations of the non-linear dynamics of preheating in the early univ
 erse are not feasible. I will present a controlled experiment to simulate 
 the key aspects of inflationary preheating in a parametrically driven inte
 rface between two fluids. We study the scattering of large amplitude&nbsp\
 ;Faraday&nbsp\;waves and observe a broadening of primary resonance bands a
 nd the subsequent appearance of secondary instabilities and their estimate
 d growth rates\, as predicted in preheating. Finally\, I&nbsp\;will elabor
 ate on the possibility to set up tabletop experiments to reconstruct some 
 of the most elusive and fascinating processes related to the early univers
 e&nbsp\;beyond preheating.&nbsp\;
LOCATION:Seminar Room 1\, Newton Institute
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