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SUMMARY:Relativistic QED developments for atomic and molecular bound state
  computations - Dr Edit Mátyus\, ELTE Faculty of Science\, Budapest
DTSTART:20231018T133000Z
DTEND:20231018T143000Z
UID:TALK201493@talks.cam.ac.uk
CONTACT:Lisa Masters
DESCRIPTION:Ongoing precision spectroscopy experiments with atoms and mole
 cules provide low-energy tests of the Standard Model and complement high-e
 nergy tests of matter carried out in particle colliders. I focus on the qu
 antum electrodynamics (QED) sector of the Standard Model and aim to develo
 p its current\, practical applications to atomic and molecular bound state
 s. The highest-precision numerical results have been obtained using the so
 -called non-relativistic QED approach\, in which the non-relativistic ener
 gy is appended with corrections of increasing orders of the α fine struct
 ure constant. The available corrections are limited to finite orders of α
  and its nuclear-charge-number multiple\, Zα. I aim to bridge the current
  precision physics methodologies with the relativistic quantum chemistry p
 ractice. The former is comprehensive (up to some finite α and Zα orders)
  in terms of the QED theory\, the latter is useful for correlated\, medium
 -to-high-Z systems under wet-lab chemical energy resolution. The unifying 
 theoretical framework is found through the field-theoretic Bethe–Salpete
 r equation and its exact equal-time variant\, in which a two-(many-)partic
 le relativistic Hamiltonian can be identified. Within this theoretical fra
 mework\, high-precision computational approaches have been recently develo
 ped in my group\, which deliver results consistent with nrQED established 
 for low Z\, but include partial resummation in Zα\, and hence\, provide a
 utomated (numerical) access to high Zα orders. I will highlight elements 
 of our ongoing work targeting pair\, retardation\, and radiative correctio
 ns to the high-precision relativistic-correlated energy.\n
LOCATION:Unilever Lecture Theatre\, Yusuf Hamied Department of Chemistry
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