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Lagrangian-formalism
New post in Lagrangian-formalism
Invariance of canonical Hamiltonian equation when adding the total time derivative of a function of $q_i$ and $t$ to the Lagrangian
August 10th, 2022
lagrangian-formalism
homework-and-exercises
classical-mechanics
hamiltonian-formalism
Use partial or covariant derivatives when deriving equations of a field theory?
February 2nd, 2020
lagrangian-formalism
variational-calculus
functional-derivatives
differential-geometry
field-theory
Action of a massive free point-particle in relativistic mechanics
September 13th, 2020
special-relativity
lagrangian-formalism
variational-principle
action
Variation of Action with time coordinate variations
June 30th, 2021
variational-principle
action
boundary-terms
classical-mechanics
lagrangian-formalism
How to find the Lagrangian of this system?
May 24th, 2020
lagrangian-formalism
classical-mechanics
variational-principle
variational-calculus
differential-equations
Derivation of Lagrange Equations from Newton's Second Law for a Non-holonomic System of Particles
March 26th, 2020
constrained-dynamics
lagrangian-formalism
classical-mechanics
Noether Current when the Lagrangian depends on second derivative of the fields
February 22nd, 2020
lagrangian-formalism
conservation-laws
field-theory
brst
noethers-theorem
Noether's theorem for space translational symmetry
August 1st, 2022
classical-mechanics
lagrangian-formalism
conservation-laws
symmetry
noethers-theorem
Counting massive degrees of freedom after gauge fixing
August 1st, 2022
gauge
degrees-of-freedom
gauge-theory
lagrangian-formalism
quantum-field-theory
Is the shorthand $ \partial_{\mu} $ strictly a partial derivative in field theory?
August 4th, 2020
variational-calculus
differentiation
notation
field-theory
lagrangian-formalism
How can I tell that a Lagrangian has an $SU(2)\times SU(2)$ symmetry?
October 11th, 2020
lorentz-symmetry
group-representations
group-theory
field-theory
lagrangian-formalism
Noether's current for dilation transformation
November 11th, 2020
homework-and-exercises
field-theory
scale-invariance
noethers-theorem
lagrangian-formalism
Are constraint forces infinite?
January 28th, 2022
regularization
forces
classical-mechanics
lagrangian-formalism
constrained-dynamics
Fluid Mechanics from a variational principle
December 26th, 2020
fluid-dynamics
lagrangian-formalism
variational-principle
action
continuum-mechanics
Is there a valid Lagrangian formulation for all classical systems?
February 5th, 2020
classical-mechanics
energy-conservation
lagrangian-formalism
hamiltonian
Peskin & Schroeder Chapter 3.1 EoM Lorentz Invariant under Lorentz Invariant Lagrangian
August 20th, 2022
quantum-field-theory
special-relativity
lagrangian-formalism
Recovering all of Maxwell's equations from the variational principle
August 1st, 2022
electromagnetism
lagrangian-formalism
classical-electrodynamics
maxwell-equations
variational-principle
Why is the Hamiltonian zero in relativity?
January 24th, 2020
general-relativity
energy
lagrangian-formalism
hamiltonian-formalism
constrained-dynamics
Lagrangian for Perfect fluid Stress-Energy tensor
November 3rd, 2020
general-relativity
fluid-dynamics
cosmology
lagrangian-formalism
stress-energy-momentum-tensor
How to calculate second-order variations of an action?
June 1st, 2020
homework-and-exercises
lagrangian-formalism
field-theory
action
variational-calculus
Lagrangian method for an $LC$-Circuit
February 2nd, 2020
lagrangian-formalism
electric-circuits
potential-energy
capacitance
inductance
QFT: Propagators are the inverse of the quadratic terms in $\mathcal{L}$?
April 17th, 2022
quantum-field-theory
lagrangian-formalism
feynman-diagrams
greens-functions
propagator
Is it circular reasoning to derive Newton's laws from action minimization?
May 26th, 2021
action
lagrangian-formalism
newtonian-mechanics
variational-principle
The number of independent variables in the Lagrangian and Hamiltonian methods in Classical Mechanics
August 1st, 2022
degrees-of-freedom
hamiltonian-formalism
momentum
lagrangian-formalism
Deriving Yang-Mills Equations
October 5th, 2021
homework-and-exercises
lagrangian-formalism
gauge-theory
variational-principle
yang-mills
How does the canonical momentum $p_i\equiv\frac{\partial L}{\partial\dot q_i}$ transform under a coordinates change $\mathbf q\to\mathbf Q$?
December 14th, 2021
momentum
lagrangian-formalism
classical-mechanics
electromagnetism
quantum-mechanics
How are constraint forces represented in Lagrangian mechanics?
August 1st, 2022
lagrangian-formalism
forces
constrained-dynamics
Is the Lagrangian density in field theory real?
July 19th, 2020
lagrangian-formalism
quantum-field-theory
unitarity
action
path-integral
How can you solve this "paradox"? Central potential
August 1st, 2022
centrifugal-force
reference-frames
lagrangian-formalism
classical-mechanics
newtonian-mechanics
Why is lagrangian density with interactions correct?
February 1st, 2022
locality
interactions
field-theory
lagrangian-formalism
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