<we><edit> <!-- questions and answers -->
quantum-entanglement
friction
homework-and-exercises
thermodynamics
newtonian-mechanics
momentum
statistical-mechanics
quantum-electrodynamics
special-relativity
gravity
tensor-calculus
universe
electromagnetism
kinematics
waves
standard-model
acoustics
semiconductor-physics
cosmology
field-theory
electric-current
fluid-dynamics
work
relativity
differential-geometry
quantum-field-theory
Fermions, different species and (anti-)commutation rules
quantum-field-theory
fermions
commutator
anticommutator
Does quantum field theory need time?
quantum-field-theory
cosmology
time
quantum-gravity
What is the calculation rule of the normal ordering operator?
quantum-field-theory
operators
wick-theorem
Why does unitarity require the Higgs to exist?
quantum-field-theory
standard-model
unitarity
Why does the non-linearity of the string action prohibit stretching due to strong excitations?
quantum-field-theory
string-theory
action
non-linear-systems
Energies of this field Hamiltonian?
quantum-field-theory
Is there a simple way to understand why SUGRA is two-loop renormalisable?
quantum-field-theory
renormalization
supersymmetry
quantum-gravity
supergravity
What's the physical interpretation of a time-ordered correlator of currents?
quantum-field-theory
correlation-functions
Non-Fock representation of quantum field theory
quantum-field-theory
hilbert-space
qft-in-curved-spacetime
Why do we care about old-style, counterterm renormalizability?
quantum-field-theory
renormalization
perturbation-theory
effective-field-theory
non-perturbative
Renormalisation of NSLM in 2D
quantum-field-theory
renormalization
symmetry-breaking
Doubt regarding Thomas banks equation about perturbation
quantum-mechanics
quantum-field-theory
How does mass of the exchange particles affect the range of a force?
quantum-field-theory
particle-physics
photons
strong-force
gluons
Massive vector boson propagators and renormalizability
quantum-field-theory
standard-model
renormalization
Can dimensional regularization be viewed as a soft version of a Wilsonian cutoff?
quantum-field-theory
renormalization
regularization
effective-field-theory
Momentum and Higgs Fields
quantum-mechanics
quantum-field-theory
particle-physics
higgs
classical-field-theory
How are second-class constraints handled in the path integral formulation?
quantum-field-theory
hamiltonian-formalism
path-integral
constrained-dynamics
partition-function
Cutoff-dependent "inverse propagator" for renormalization
quantum-field-theory
renormalization
feynman-diagrams
propagator
Are Feynman rules unique?
quantum-field-theory
standard-model
feynman-diagrams
What is the position-space form of the photon propagator in a general gauge?
quantum-field-theory
Why is the auxiliary field from Hubbard-Stratonovich transformation for Hubbard model the same as the mean-field ferromagnetic order parameter?
quantum-field-theory
condensed-matter
path-integral
Origin of heat kernel regularization
quantum-field-theory
history
regularization
functional-determinants
What is the Grassmann parameter $\epsilon$ in the BRST transformation?
quantum-field-theory
grassmann-numbers
brst
How are coherent states in the real world made?
quantum-field-theory
coherence
coherent-states
Counting massive degrees of freedom after gauge fixing
quantum-field-theory
lagrangian-formalism
gauge-theory
degrees-of-freedom
gauge
Reference Request: Invariant Feynman amplitudes with global symmetry on Lagrangian
quantum-field-theory
resource-recommendations
symmetry
scattering
feynman-diagrams
Why does Josephson's identity $d\nu=2-\alpha$ only hold for mean field theory in dimension $4$?
quantum-field-theory
statistical-mechanics
renormalization
phase-transition
mean-field-theory
Can we say the origin of spin is due to mixing of various components of field under Lorentz transformation?
quantum-field-theory
quantum-spin
quantum-electrodynamics
lorentz-symmetry
spinors
Relation between Wilsonian renormalization and Counterterm Renormalization
quantum-field-theory
field-theory
renormalization
effective-field-theory
Calculating $\mathrm{Tr}[\log \Delta_F]$
quantum-field-theory
path-integral
casimir-effect
trace
functional-determinants
Quantum Field Theory Interpretation of $\hat{\phi}|0\rangle$
quantum-field-theory
Spin magnetic moment direction of a particle
quantum-mechanics
quantum-field-theory
quantum-spin
Calculation of Feynman invariant amplitude with internal global symmetry indices: trace over\and isospin
quantum-field-theory
symmetry
scattering
feynman-diagrams
isospin-symmetry
Is it true that matter and antimatter must have same mass?
quantum-field-theory
special-relativity
particle-physics
mass
antimatter
Perturbation theory around solvable but non-free hamiltonian
quantum-field-theory
condensed-matter
feynman-diagrams
perturbation-theory
many-body
Proof of cluster decomposition theorem
quantum-field-theory
correlation-functions
locality
Renormalization of mass of an electron inside the crystal
quantum-field-theory
statistical-mechanics
renormalization
classical-electrodynamics
classical-field-theory
What are thermal photons?
quantum-field-theory
particle-physics
photons
thermal-radiation
thermal-field-theory
Thermal field theory of isolated electroweak plasma
quantum-field-theory
standard-model
thermal-field-theory
Difference of vacuum states
quantum-field-theory
vacuum
Clarification on contraction
quantum-field-theory
correlation-functions
propagator
wick-theorem
Interpretation of correlation functions that are higher than 2 point
quantum-field-theory
many-body
correlation-functions
Hamiltonian with periodic potential in second quantization
homework-and-exercises
quantum-field-theory
second-quantization
tight-binding
Schrodinger Wave Functional (quantum fields) - Solving Functional Gaussian Integrals
homework-and-exercises
quantum-field-theory
fourier-transform
propagator
Green's functions in the Keldysh-formalism and quantum stochastic calculus
quantum-field-theory
resource-recommendations
greens-functions
stochastic-processes
open-quantum-systems
Flavor symmetry fixes the Higgs branch in any 4D ${\cal N}=2$ QFT
quantum-field-theory
supersymmetry
research-level
moduli
algebraic-geometry
Commutator of canonical fields in Quantum Field Theory
quantum-field-theory
integration
commutator
klein-gordon-equation
parity
if our universe was/behaved like a quantum computer, could it behave like a boltzmann brain?
quantum-field-theory
cosmology
quantum-information
vacuum
Is this interpretation of quantum fluctuation in eternal inflation in Wikipedia correct?
quantum-field-theory
cosmology
cosmological-inflation
multiverse
Is the Rindler vacuum invariant under Poincare symmetries?
quantum-field-theory
qft-in-curved-spacetime
poincare-symmetry
Is it possible to ensure the diagonalization of the minimal coupling Hamiltonian?
quantum-mechanics
electromagnetism
quantum-field-theory
quantum-electrodynamics
Adding energies vs. adding momenta
quantum-field-theory
momentum
hilbert-space
hamiltonian
second-quantization
Lorentz-invariant phase space for 2->2 scattering
quantum-field-theory
special-relativity
kinematics
integration
lorentz-symmetry
What is a contraction in QFT?
quantum-field-theory
operators
correlation-functions
wick-theorem
Pi / Euler-Riemann / Golden Ratio in physics?
quantum-mechanics
quantum-field-theory
quantum-spin
quantum-entanglement
relativity
How do you set the phase space area for the simulation of a quantum system?
quantum-mechanics
quantum-field-theory
computational-physics
simulations
phase-space
'Quantized' increase in velocity? Or 'quantized' acceleration perhaps?
quantum-mechanics
electromagnetism
quantum-field-theory
electrostatics
quantum-electrodynamics
gauge-invariant 6-quark order parameter
quantum-field-theory
quantum-chromodynamics
symmetry-breaking
One-particle states in curved spacetimes
quantum-field-theory
general-relativity
hilbert-space
symmetry
qft-in-curved-spacetime
Noether charge for Lorentz Transformation in terms of creation / annihilation operators
quantum-mechanics
homework-and-exercises
quantum-field-theory
classical-mechanics
classical-field-theory
Energy density drops in all regions of space in Standard inflation, and in some regions of space in Chaotic/Eternal inflation
quantum-field-theory
energy
cosmology
vacuum
cosmological-inflation
Perturbative renormalization and Wilsonian approach
quantum-field-theory
lagrangian-formalism
renormalization
perturbation-theory
effective-field-theory
Is there any Stack Exchange site for discussing Non-mainstream physics?
quantum-mechanics
quantum-field-theory
Reparameterization and conformal transformation in SYK
quantum-field-theory
conformal-field-theory
$\mu \rightarrow e\gamma$ in the $R_\xi$ gauge: trouble with momenta and Dirac matrices
quantum-field-theory
standard-model
dirac-matrices
Would a high energy bottom quark 'decay' to a top quark?
quantum-field-theory
particle-physics
standard-model
quarks
Self coupled scalar field theory of gravity
quantum-field-theory
general-relativity
gravitational-waves
higgs
S-matrix derived directly in terms of the interaction picture
quantum-mechanics
quantum-field-theory
interactions
s-matrix-theory
momentum and mode functions in QFT in curved spacetime
quantum-field-theory
qft-in-curved-spacetime
What are periods of field strength?
quantum-field-theory
gauge-theory
quantum-electrodynamics
path-integral
Full photon propagator in S-matrix calculation
quantum-field-theory
quantum-electrodynamics
renormalization
propagator
ward-identity
Why should the vacuum be unique?
quantum-field-theory
vacuum
wightman-fields
Question about convergence of Dyson Series. Why Dyson series is in general divergent?
quantum-mechanics
quantum-field-theory
perturbation-theory
asymptotics
What conserved charge follows from the dual field strength tensor?
electromagnetism
quantum-field-theory
maxwell-equations
topology
When is this particle potential bounded?
quantum-field-theory
particle-physics
potential
symmetry-breaking
Symplectic reduction to moduli space in Chern-Simons theory
quantum-mechanics
quantum-field-theory
poisson-brackets
chern-simons-theory
deformation-quantization
Spontaneously broken linear sigma model in Peskin & Schroeder: where is the miracle?
quantum-field-theory
renormalization
symmetry-breaking
How long can a virtual particles exist in a vacuum state?
quantum-field-theory
vacuum
virtual-particles
What are mass eigenstates?
quantum-field-theory
particle-physics
mass
neutrinos
Space tranlsation symmetry breaking
quantum-field-theory
symmetry
phase-transition
symmetry-breaking
many-body
Motivation for the definition of gaussian states
quantum-mechanics
quantum-field-theory
definition
A simple question about the scattering amplitude $\mathcal{M}$ in QFT
quantum-field-theory
scattering
conventions
notation
spinors
Dirac field operator expansion in magnetic field
quantum-field-theory
field-theory
quantum-electrodynamics
Some clarification on Dirac and Weyl spinor terminology
quantum-field-theory
spinors
Inverse Square Law in $D$ dimensions (two cases)
homework-and-exercises
quantum-field-theory
fourier-transform
greens-functions
propagator
Diagram versus gradient expansion
quantum-field-theory
feynman-diagrams
effective-field-theory
wigner-transform
How does QFT in curved spacetime work when state is in momentum space?
quantum-field-theory
momentum
curvature
fourier-transform
qft-in-curved-spacetime
Computing Feynman Diagrams with Majorana and Dirac Fermions
quantum-field-theory
conservation-laws
feynman-diagrams
majorana-fermions
Gaussian integral in momentum space
homework-and-exercises
quantum-field-theory
condensed-matter
path-integral
integration
Difference, in relation to minus sign, between the processes: $gg \to q\bar q$ and $qg\to qg$
quantum-field-theory
particle-physics
quantum-chromodynamics
What's the differences between pseudospin and spin?
quantum-mechanics
quantum-field-theory
What is spin/charge relation in condensed matter physics?
quantum-field-theory
chern-simons-theory
wilson-loop
Lorentz boosting and Energy Scale
quantum-field-theory
special-relativity
Loop counting -- what if the graph is not planar?
quantum-field-theory
feynman-diagrams
perturbation-theory
graph-theory
What is the mathematically simplest particle field?
quantum-field-theory
particle-physics
standard-model
Classical field limit of the electron quantum field
quantum-mechanics
quantum-field-theory
classical-field-theory
Under which conditions does an interaction-free quantum field represent physical reality well?
quantum-field-theory
Conformal invariance of Electromagnetic field action
electromagnetism
quantum-field-theory
field-theory
conformal-field-theory
classical-field-theory
Why must fermion fields anticommute and bosons commute?
quantum-field-theory
fermions
commutator
spin-statistics
anticommutator
LSZ theorem for photons
quantum-field-theory
photons
resource-recommendations
quantum-electrodynamics
s-matrix-theory