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SUMMARY:Subtleties of light-front two-point functions
DTSTART:20260422T080000Z
DTEND:20260422T090000Z
DTSTAMP:20260429T205800Z
UID:indico-event-59@indico.onium.cc
DESCRIPTION:Speakers: Lubomir MARTINOVIC (Slovak Academy of Sciences)\n\nA
  careful study of the two-point functions in light-front (LF) field theory
  is performed at equal LF time $x^+=y^+$ and at coinciding space-time poin
 ts $x=y$. Using a regularized field expansion\, we demonstrate that recent
  claims in literature about failure of the Hamiltonian "on-shell" form of 
 the LF theory are not justified. It is actually the Feynman treatment whic
 h\, without proper regularization\, leads to mathematically ill defined am
 plitudes (tadpole diagram)\, while the LF Fock methods yield consistent re
 sults. In the second part of my talk\, a very simple exactly solvable mode
 l with two massive scalar fields will be suggested as a suitable example f
 or comparison of the non-perturbative structure of the LF and "equal-time"
  forms of field theory. Diagonalization of the corresponding Hamiltonians 
 and construction of their physical vacuum states can help to clarify the r
 elation between the two forms of QFT. \n++++++++++++++++++++++++++++++++++
 ++++++++++++\nzoom ID: 969 7208 1483PW: 626102\nhttps://zoom.us/j/96972081
 483?pwd=0La102wRbXSrTshxed9eaC7ve1M5QL.1\n \n============================
 ======\nrecording:\nhttps://zoom.us/rec/share/evAb924g7Pnx53sLS7ql_JFl5qw0
 SqyjbzX3L5qWrW9bJklRDLExmLpCfLifuG32.18LTE125OWDyKStv PW: Q..H8eQ9\n\n\nh
 ttps://indico.onium.cc/event/59/
URL:https://indico.onium.cc/event/59/
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