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Variational-principle
New post in Variational-principle
Euler-Lagrange equations for free rigid body
March 25th, 2020
rigid-body-dynamics
rotational-dynamics
lagrangian-formalism
action
variational-principle
What shape of track minimizes the time a ball takes between start and stop points of equal height?
August 1st, 2022
classical-mechanics
variational-principle
brachistochrone-problem
What variables does the action $S$ depend on?
October 22nd, 2020
classical-mechanics
lagrangian-formalism
variational-principle
action
Proof that total derivative is the only function that can be added to Lagrangian without changing the EOM
May 2nd, 2020
variational-principle
classical-mechanics
lagrangian-formalism
mathematical-physics
action
Derivation of Dirac equation using the Lagrangian density for Dirac field
June 3rd, 2020
lagrangian-formalism
variational-calculus
dirac-equation
variational-principle
homework-and-exercises
Can we find the boundary conditions of fields from the stationary action principle?
December 12th, 2021
variational-calculus
action
variational-principle
field-theory
relativity
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
lagrangian-formalism
differential-geometry
variational-principle
geodesics
homework-and-exercises
Does a four-divergence extra term in a Lagrangian density matter to the field equations?
March 13th, 2022
lagrangian-formalism
variational-principle
boundary-conditions
variational-calculus
functional-derivatives
Why are D'Alembert's Principle and the Principle of Least Action Related?
August 19th, 2020
constrained-dynamics
action
variational-principle
lagrangian-formalism
newtonian-mechanics
Point of Lagrange multipliers
September 15th, 2020
variational-principle
lagrangian-formalism
constrained-dynamics
Least Action in General Relativity
August 1st, 2022
lagrangian-formalism
general-relativity
geodesics
variational-principle
conservation-laws
Variation of modified Einstein Hilbert Action
January 11th, 2020
variational-principle
metric-tensor
general-relativity
homework-and-exercises
Do we have a deeper understanding of Fermat's Principle?
August 11th, 2020
variational-principle
history
optics
Hamilton's principle with semiholonomic constraints in Goldstein
September 30th, 2020
variational-principle
constrained-dynamics
textbook-erratum
lagrangian-formalism
classical-mechanics
Is the Lagrangian approach essentially a 'theory of everything'?
January 2nd, 2020
theory-of-everything
action
variational-principle
lagrangian-formalism
How to bend light?
August 1st, 2022
visible-light
variational-principle
optics
refraction
How the boundary term in the variation of the action vanishes
August 1st, 2022
boundary-terms
action
variational-principle
lagrangian-formalism
What is Maupertuis' principle good for?
September 4th, 2020
variational-principle
classical-mechanics
lagrangian-formalism
hamiltonian-formalism
Boundary term in Einstein-Hilbert action
August 1st, 2022
general-relativity
lagrangian-formalism
variational-principle
action
boundary-terms
Hamilton's characteristic and principal functions and separability
December 15th, 2020
variational-principle
hamiltonian-formalism
energy
classical-mechanics
hamiltonian
Why is that in the action principle, the Taylor's series is limited to the first order?
August 29th, 2020
lagrangian-formalism
variational-calculus
approximations
variational-principle
differentiation
Must the action be a Lorentz scalar?
August 1st, 2022
special-relativity
variational-principle
action
electromagnetism
Variation of Action with time coordinate variations
June 30th, 2021
lagrangian-formalism
boundary-terms
action
variational-principle
classical-mechanics
Action of a massive free point-particle in relativistic mechanics
September 13th, 2020
special-relativity
lagrangian-formalism
variational-principle
action
How to find the Lagrangian of this system?
May 24th, 2020
variational-calculus
classical-mechanics
lagrangian-formalism
variational-principle
differential-equations
Fermat's principle to prove the law of reflection
February 23rd, 2020
geometric-optics
variational-principle
reflection
optics
Can Schrödinger Equation be derived from Huygens' Principle?
August 1st, 2022
quantum-mechanics
huygens-principle
variational-principle
schroedinger-equation
optics
Recovering all of Maxwell's equations from the variational principle
August 1st, 2022
lagrangian-formalism
electromagnetism
classical-electrodynamics
maxwell-equations
variational-principle
Fluid Mechanics from a variational principle
December 26th, 2020
lagrangian-formalism
action
variational-principle
continuum-mechanics
fluid-dynamics
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