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SUMMARY:Erickson Tjoa (Max Planck Institute for Quantum Optics)
DTSTART:20240516T130000Z
DTEND:20240516T150000Z
DTSTAMP:20260417T072537Z
UID:3cqfs/17
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/3cqfs/17/">T
 he Unruh-DeWitt model and its joint interacting Hilbert space</a>\nby Eric
 kson Tjoa (Max Planck Institute for Quantum Optics) as part of Tricontinen
 tal Quantum Fundamentals Seminar\n\n\nAbstract\nIn this work we make the c
 onnection between the Unruh-DeWitt particle detector model applied to quan
 tum field theory in curved spacetimes and the rigorous construction of the
  spin-boson model. With some modifications\, we show that existing results
  about the existence of a spin-boson ground state can be adapted to the Un
 ruh-DeWitt model. In the physically relevant setting involving massless fi
 elds in $(3+1)$-dimensional spacetimes\, we argue that common choices of t
 he spacetime smearing functions regulate the ultraviolet behaviour of the 
 model but can still exhibit infrared divergences. We discuss the condition
 s under which this problem does not arise and the relevance of the operato
 r-algebraic approach for better understanding of particle detector models 
 and their applications.\n
LOCATION:https://researchseminars.org/talk/3cqfs/17/
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