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S-matrix-theory
New post in S-matrix-theory
S-matrix in Weinberg QFT
July 29th, 2020
s-matrix-theory
quantum-field-theory
scattering
S-Matrix Elements in Path Integral Formalism
August 13th, 2020
s-matrix-theory
quantum-field-theory
path-integral
quantization
Connected and strongly connected Feynman diagrams
April 22nd, 2020
scattering
s-matrix-theory
1pi-effective-action
feynman-diagrams
quantum-field-theory
Green's Functions from Gell-Mann and Low Theorem
March 21st, 2020
s-matrix-theory
correlation-functions
greens-functions
quantum-field-theory
normalization
Free Vacuum vs Interacting Vacuum and Wick's theorem
September 26th, 2020
operators
s-matrix-theory
quantum-field-theory
wick-theorem
Basic question about the S-Matrix, Unitarity and Effective Field Theory
December 20th, 2020
effective-field-theory
s-matrix-theory
unitarity
renormalization
quantum-field-theory
There are two definitions of S operator (or S matrix) in quantum field theory. Are they equivalent?
April 1st, 2020
s-matrix-theory
scattering
quantum-field-theory
Scattering amplitude and LSZ formula
August 1st, 2022
scattering
feynman-diagrams
correlation-functions
s-matrix-theory
quantum-field-theory
Why do disconnected diagrams not contribute to the S matrix?
August 13th, 2020
s-matrix-theory
correlation-functions
quantum-field-theory
feynman-diagrams
Probability conservation in WKB tunneling
August 1st, 2022
unitarity
semiclassical
quantum-tunneling
quantum-mechanics
s-matrix-theory
When we define the S-matrix, what are "in" and "out" states?
November 4th, 2020
quantum-field-theory
scattering
hilbert-space
s-matrix-theory
Why does the action have to be hermitian?
February 20th, 2020
quantum-field-theory
action
unitarity
s-matrix-theory
Applications of analytic continuation to physics
March 1st, 2020
regularization
complex-numbers
s-matrix-theory
wick-rotation
What actually means to compute things at tree level?
May 18th, 2020
feynman-diagrams
quantum-field-theory
quantum-mechanics
s-matrix-theory
propagator
Does de Sitter space admit an asymptotic S-matrix?
August 1st, 2022
quantum-field-theory
de-sitter-spacetime
s-matrix-theory
CFT and the Coleman-Mandula Theorem
August 1st, 2022
s-matrix-theory
quantum-field-theory
symmetry
conformal-field-theory
scale-invariance
Fermi's golden rule and S-matrix
January 2nd, 2020
s-matrix-theory
quantum-field-theory
fermis-golden-rule
Quantum Field Theory in position space instead of momentum space?
August 1st, 2022
fourier-transform
s-matrix-theory
perturbation-theory
quantum-field-theory
feynman-diagrams
Why do we not have spin greater than 2?
August 1st, 2022
quantum-field-theory
higher-spin
s-matrix-theory
unitarity
quantum-spin
What is the physical interpretation of the S-matrix in QFT?
November 25th, 2020
s-matrix-theory
scattering
string-theory
conformal-field-theory
quantum-field-theory
What are bootstraps?
March 26th, 2020
particle-physics
s-matrix-theory
Does the exact string theory $S$-matrix describe all physics there is?
September 29th, 2020
scattering
string-theory
s-matrix-theory
Unitary quantum field theory
September 30th, 2021
hilbert-space
unitarity
quantum-field-theory
s-matrix-theory
definition
Green's function in path integral approach (QFT)
August 1st, 2022
greens-functions
s-matrix-theory
path-integral
scattering
quantum-field-theory
Scattering, Perturbation and asymptotic states in LSZ reduction formula
December 26th, 2020
quantum-field-theory
hilbert-space
scattering
vacuum
s-matrix-theory
Equivalence Theorem of the S-Matrix
July 8th, 2020
quantum-field-theory
path-integral
s-matrix-theory
Derivation of the S-matrix/Dyson's formula from David Tong's lecture notes
August 1st, 2022
s-matrix-theory
field-theory
quantum-field-theory
scattering
The derivation steps of the LSZ reduction formula
August 1st, 2022
quantum-field-theory
operators
s-matrix-theory
Definition of the S-matrix
August 1st, 2022
s-matrix-theory
hilbert-space
quantum-field-theory
quantum-mechanics
S-matrix and time-evolution operator
August 1st, 2022
s-matrix-theory
interactions
quantum-field-theory
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