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SUMMARY:Joseph Avron (Technion)
DTSTART:20210418T150000Z
DTEND:20210418T154500Z
DTSTAMP:20260422T212706Z
UID:Simons75th/1
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Simons75th/1
 /">The story of Einstein's most cited paper</a>\nby Joseph Avron (Technion
 ) as part of Barry Simon's 75th Birthday Conference\n\n\nAbstract\nEinstei
 n's most cited paper is his 1935 paper with Podolsky and Rosen known as EP
 R. It initiated the Einstein-Bohr correspondence and fathered entanglement
 . It is a striking example of useless metaphysics evolving into a resource
  of quantum technology. I shall conclude by describing two of the great-gr
 andchildren of EPR\, namely\, the GHZ game and Teleportation.\n
LOCATION:https://researchseminars.org/talk/Simons75th/1/
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BEGIN:VEVENT
SUMMARY:Fritz Gesztesy (Baylor University)
DTSTART:20210418T155500Z
DTEND:20210418T164000Z
DTSTAMP:20260422T212706Z
UID:Simons75th/2
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Simons75th/2
 /">A general Birman–Schwinger principle and some applications</a>\nby Fr
 itz Gesztesy (Baylor University) as part of Barry Simon's 75th Birthday Co
 nference\n\n\nAbstract\nWe prove a generalized Birman–Schwinger principl
 e in the non-self-adjoint context and provide a discussion of geometric an
 d algebraic multiplicities of eigenvalues of the basic operator of interes
 t (e.g.\, a Schrödinger operator) and the associated Birman–Schwinger o
 perator. Specifically\, we study the associated Jordan chains of generaliz
 ed eigenvectors of both operators. We also relate algebraic multiplicities
  to the notion of the index of analytic operator-valued functions and deri
 ve a general Weinstein–Aronszajn formula for a pair of non-self-adjoint 
 operators.\n\nThis is based on joint work with Jussi Behrndt and Tom ter E
 lst.\n
LOCATION:https://researchseminars.org/talk/Simons75th/2/
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SUMMARY:Michael Aizenman (Princeton)
DTSTART:20210418T165500Z
DTEND:20210418T174000Z
DTSTAMP:20260422T212706Z
UID:Simons75th/3
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Simons75th/3
 /">Revisiting the Berezinskii-Kosterlitz-Thouless phase transition</a>\nby
  Michael Aizenman (Princeton) as part of Barry Simon's 75th Birthday Confe
 rence\n\n\nAbstract\nA shortcut is presented for establishing the BKT phas
 e transition in the Villain model of two component spins over planar graph
 s.  The new ingredient is a proof that delocalization of a corresponding D
 iscrete Gaussian Field (DGF)\, defined on the dual lattice at the inverse 
 temperature\, implies directly that for any $\\eta>2$  the Villain model
 ’s spin-spin correlations decay not faster than $1/\\|x-y\\|^{\\eta}$.  
 Combined with the streamlined proof of delocalization transition in the DG
 F on cubic graphs by P. Lammers this yields a short proof of the BKT trans
 ition in the Villain model on the 2D triangular lattice.  \n\n(Joint work 
 with Matan Harel and Jacob Shapiro)\n
LOCATION:https://researchseminars.org/talk/Simons75th/3/
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BEGIN:VEVENT
SUMMARY:Barry Simon (Caltech)
DTSTART:20210418T175000Z
DTEND:20210418T183500Z
DTSTAMP:20260422T212706Z
UID:Simons75th/4
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Simons75th/4
 /">The Work of Daniel Wells\, Forty Years Late</a>\nby Barry Simon (Caltec
 h) as part of Barry Simon's 75th Birthday Conference\n\n\nAbstract\nIn wor
 king on a book I’m writing on “Phase Transitions in the Theory of Latt
 ice Gases”\, I came across an unpublished 1977 thesis of Daniel Wells wi
 th some beautiful results comparing Ising type models with different aprio
 ri single spin distributions.. I will describe his unpublished work as wel
 l as some interesting extensions I found to D-component models that may be
  new (they are not in the thesis but may have been in a mystery preprint t
 hat I have not gotten ahold of!). I’ll also discuss some open problems.\
 n
LOCATION:https://researchseminars.org/talk/Simons75th/4/
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