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Lagrangian-formalism
New post in Lagrangian-formalism
Euler-Lagrange equations for free rigid body
March 25th, 2020
lagrangian-formalism
rigid-body-dynamics
rotational-dynamics
variational-principle
action
Why is angular acceleration of a pendulum always negative?
May 26th, 2020
lagrangian-formalism
rotational-kinematics
angular-velocity
classical-mechanics
acceleration
Hamiltonian of a charged particle in a magnetic field coincides with that of a free particle?
April 7th, 2020
classical-mechanics
classical-electrodynamics
hamiltonian-formalism
lagrangian-formalism
The form of Lagrangian for a free particle
August 1st, 2022
classical-mechanics
lagrangian-formalism
inertial-frames
Translations and Noether's Theorem
May 18th, 2020
lagrangian-formalism
symmetry
conservation-laws
field-theory
noethers-theorem
What variables does the action $S$ depend on?
October 22nd, 2020
action
classical-mechanics
lagrangian-formalism
variational-principle
What is the Lagrangian for a relativistic charge that includes the self-force?
August 1st, 2022
lagrangian-formalism
classical-electrodynamics
Proof that total derivative is the only function that can be added to Lagrangian without changing the EOM
May 2nd, 2020
classical-mechanics
lagrangian-formalism
mathematical-physics
variational-principle
action
Reduction of Nambu-Goto action to true degrees of freedom
November 27th, 2020
constrained-dynamics
string-theory
lagrangian-formalism
gauge-theory
hamiltonian-formalism
QED lagrangian: gauge fixing term
August 1st, 2022
gauge
gauge-invariance
quantum-electrodynamics
lagrangian-formalism
electromagnetism
How to find the Stress-Energy tensor?
January 8th, 2020
general-relativity
lagrangian-formalism
action
stress-energy-momentum-tensor
Landau Mechanics: why does adding Lagrangians remove the indefiniteness of multiplying each Lagrangian by a different constant?
February 28th, 2020
classical-mechanics
lagrangian-formalism
Derivation of Dirac equation using the Lagrangian density for Dirac field
June 3rd, 2020
homework-and-exercises
lagrangian-formalism
variational-principle
dirac-equation
variational-calculus
Dirac Lagrangian density in curved spacetime
June 12th, 2020
quantum-field-theory
general-relativity
lagrangian-formalism
dirac-equation
qft-in-curved-spacetime
Why are derivatives in interaction terms treated differently from derivatives in the kinetic term?
May 3rd, 2020
quantum-field-theory
lagrangian-formalism
feynman-diagrams
perturbation-theory
interactions
The Schrödinger equation as an Euler-Lagrange equation
September 26th, 2021
many-body
second-quantization
quantum-mechanics
lagrangian-formalism
schroedinger-equation
Lagrangian $L' = L + \frac{df}{dt}$ gives the same equations of motion
August 1st, 2022
lagrangian-formalism
classical-mechanics
${\cal N}=4$ supersymmetric yang-mills theory and S-duality
May 31st, 2021
yang-mills
supersymmetry
lagrangian-formalism
quantum-field-theory
duality
Why are coordinates and velocities sufficient to completely determine the state and determine the subsequent motion of a mechanical system?
August 28th, 2020
classical-mechanics
lagrangian-formalism
velocity
coordinate-systems
Why does the Palatini formalism of GR work?
October 22nd, 2020
general-relativity
lagrangian-formalism
Why are generalized positions and generalized velocities considered as independent of each other?
August 1st, 2022
variational-calculus
lagrangian-formalism
classical-mechanics
Can we use the term "U(1) gauge invariance" for the free electromagnetic field?
August 1st, 2022
electromagnetism
lagrangian-formalism
gauge-theory
gauge-invariance
Does a four-divergence extra term in a Lagrangian density matter to the field equations?
March 13th, 2022
lagrangian-formalism
functional-derivatives
variational-calculus
boundary-conditions
variational-principle
Invariance of Lagrange on addition of total time derivative of a function of coordiantes and time
August 1st, 2022
lagrangian-formalism
classical-mechanics
Why are D'Alembert's Principle and the Principle of Least Action Related?
August 19th, 2020
action
constrained-dynamics
variational-principle
lagrangian-formalism
newtonian-mechanics
When can we add a total time derivative of $f(q, \dot{q}, t)$ to a Lagrangian?
April 2nd, 2020
gauge-invariance
variational-principle
lagrangian-formalism
Finding 3-Sphere Christoffel connection coefficients using variational calculus, Sean Carrol problem
December 27th, 2020
homework-and-exercises
lagrangian-formalism
differential-geometry
variational-principle
geodesics
Electric current $j^{\mu}$ in standard QED vs. scalar QED
August 1st, 2022
lagrangian-formalism
quantum-electrodynamics
electric-current
gauge-invariance
Euler-Lagrange equations and friction forces
February 3rd, 2020
constrained-dynamics
friction
lagrangian-formalism
classical-mechanics
Is $\phi^4$ theory in 4d conformally invariant at the classial level?
March 13th, 2020
lagrangian-formalism
conformal-field-theory
stress-energy-momentum-tensor
classical-field-theory
scale-invariance
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