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Perturbation-theory
New post in Perturbation-theory
Where can a good treatment of the 'sudden' perturbation approximation be found?
October 2nd, 2020
perturbation-theory
resource-recommendations
quantum-mechanics
Why are derivatives in interaction terms treated differently from derivatives in the kinetic term?
May 3rd, 2020
interactions
perturbation-theory
feynman-diagrams
quantum-field-theory
lagrangian-formalism
Peskin's book page 334 proof of $Z_1=Z_2$ to all orders in QED perturbation theory
February 7th, 2020
quantum-field-theory
quantum-electrodynamics
renormalization
ward-identity
perturbation-theory
What's the difference between perturbative QCD, non-perturbative QCD, and gauge theory QCD?
August 1st, 2022
non-perturbative
perturbation-theory
quantum-chromodynamics
gauge-theory
field-theory
What do the off-diagonal elements of Hamiltonian matrix physically represent?
August 1st, 2022
hamiltonian
quantum-mechanics
quantum-states
perturbation-theory
hilbert-space
How to justify RPA (random phase approximation)?
July 21st, 2020
approximations
quantum-field-theory
perturbation-theory
feynman-diagrams
condensed-matter
Kramers-Kronig relations for the electron Self-Energy Σ
April 4th, 2020
research-level
condensed-matter
perturbation-theory
quantum-field-theory
How to decide whether one can use perturbation theory in QM?
July 21st, 2020
quantum-mechanics
hamiltonian
perturbation-theory
Why can we add counterterms?
January 25th, 2020
lagrangian-formalism
quantum-field-theory
perturbation-theory
renormalization
Why do we still use perturbation theory, when we have advanced numerical methods and fast computers?
August 1st, 2022
simulations
approximations
perturbation-theory
computational-physics
Why do the counterterms in renormalized $\phi^4$-theory with power two in fields give vertices and not propagators?
July 14th, 2020
perturbation-theory
renormalization
feynman-diagrams
quantum-field-theory
propagator
What are non-perturbative effects and how do we handle them?
February 2nd, 2020
quantum-field-theory
non-perturbative
perturbation-theory
Question about convergence of Dyson Series. Why Dyson series is in general divergent?
June 19th, 2020
asymptotics
perturbation-theory
quantum-field-theory
quantum-mechanics
In what sense are loop diagrams quantum corrections?
December 20th, 2020
feynman-diagrams
quantum-field-theory
perturbation-theory
Finding the effective Hamiltonian in a certain subspace
May 11th, 2021
perturbation-theory
effective-field-theory
condensed-matter
quantum-mechanics
Scattering states of Hydrogen atom in non-relativistic perturbation theory
August 1st, 2022
perturbation-theory
quantum-mechanics
scattering
hilbert-space
hydrogen
Physical Interpretation of Relationship Between Hall Conductivity and Berry Curvature?
April 30th, 2020
berry-pancharatnam-phase
quantum-hall-effect
perturbation-theory
solid-state-physics
condensed-matter
Small oscillations of heavy string
July 9th, 2020
classical-field-theory
perturbation-theory
oscillators
classical-mechanics
Naive question about time-dependent perturbation theory
May 7th, 2020
fermis-golden-rule
perturbation-theory
probability
quantum-mechanics
Quantum Field Theory in position space instead of momentum space?
August 1st, 2022
fourier-transform
s-matrix-theory
perturbation-theory
feynman-diagrams
quantum-field-theory
A pedestrian explanation of Renormalization Groups - from QED to classical field theories
January 7th, 2020
quantum-field-theory
lagrangian-formalism
renormalization
perturbation-theory
effective-field-theory
Tree-level QFT and classical fields/particles
August 6th, 2022
classical-field-theory
perturbation-theory
classical-mechanics
quantum-field-theory
semiclassical
Can Feynman diagrams be used to represent any perturbation theory?
August 1st, 2022
feynman-diagrams
perturbation-theory
Why is the second order perturbative correction to the ground state energy always down?
August 7th, 2022
quantum-mechanics
perturbation-theory
The Origins of Instantons from Path Integrals
August 1st, 2022
path-integral
quantum-field-theory
non-perturbative
perturbation-theory
instantons
Staying in orbit - but doesn't any perturbation start a positive feedback?
August 1st, 2022
solar-system
newtonian-gravity
chaos-theory
stability
perturbation-theory
Self-energy, 1PI, and tadpoles
August 1st, 2022
self-energy
1pi-effective-action
symmetry-breaking
perturbation-theory
quantum-field-theory
Asymptoticity of Pertubative Expansion of QFT
August 1st, 2022
perturbation-theory
research-level
quantum-field-theory
Why Does Renormalized Perturbation Theory Work?
March 9th, 2020
regularization
perturbation-theory
renormalization
quantum-field-theory
How do I calculate the perturbations to the metric determinant?
August 1st, 2022
perturbation-theory
differentiation
metric-tensor
differential-geometry
general-relativity
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