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Action
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Euler-Lagrange equations for free rigid body
March 25th, 2020
rigid-body-dynamics
action
variational-principle
rotational-dynamics
lagrangian-formalism
Polyakov action: difference induced metric and dynamical metric
August 1st, 2022
string-theory
metric-tensor
action
differential-geometry
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
classical-mechanics
variational-principle
action
lagrangian-formalism
mathematical-physics
How to find the Stress-Energy tensor?
January 8th, 2020
lagrangian-formalism
general-relativity
stress-energy-momentum-tensor
action
Can we find the boundary conditions of fields from the stationary action principle?
December 12th, 2021
variational-calculus
action
variational-principle
relativity
field-theory
Why are D'Alembert's Principle and the Principle of Least Action Related?
August 19th, 2020
lagrangian-formalism
action
constrained-dynamics
newtonian-mechanics
variational-principle
Is the Lagrangian approach essentially a 'theory of everything'?
January 2nd, 2020
variational-principle
theory-of-everything
action
lagrangian-formalism
Gauge fixing and equations of motion
May 10th, 2020
quantum-field-theory
gauge-theory
lagrangian-formalism
action
gauge-invariance
How to apply Noether's theorem
August 1st, 2022
lagrangian-formalism
symmetry
action
noethers-theorem
conservation-laws
How the boundary term in the variation of the action vanishes
August 1st, 2022
variational-principle
action
boundary-terms
lagrangian-formalism
Why is a theory Lorentz invariant if the Lagrangian is Lorentz invariant?
April 21st, 2020
special-relativity
lagrangian-formalism
symmetry
field-theory
action
Boundary term in Einstein-Hilbert action
August 1st, 2022
action
boundary-terms
general-relativity
lagrangian-formalism
variational-principle
Must the action be a Lorentz scalar?
August 1st, 2022
variational-principle
special-relativity
electromagnetism
action
Variation of Action with time coordinate variations
June 30th, 2021
action
boundary-terms
classical-mechanics
lagrangian-formalism
variational-principle
Dirac's remark that inspired Feynman when formulating path integral
August 1st, 2022
action
quantum-mechanics
history
path-integral
Action of a massive free point-particle in relativistic mechanics
September 13th, 2020
special-relativity
lagrangian-formalism
variational-principle
action
Fluid Mechanics from a variational principle
December 26th, 2020
variational-principle
lagrangian-formalism
fluid-dynamics
action
continuum-mechanics
How to calculate second-order variations of an action?
June 1st, 2020
homework-and-exercises
field-theory
variational-calculus
action
lagrangian-formalism
Is it circular reasoning to derive Newton's laws from action minimization?
May 26th, 2021
action
variational-principle
lagrangian-formalism
newtonian-mechanics
Why is the action dimensionless in natural units?
December 20th, 2020
action
units
dimensional-analysis
absolute-units
Is the Lagrangian density in field theory real?
July 19th, 2020
quantum-field-theory
lagrangian-formalism
path-integral
action
unitarity
Functional Derivative in the Linear Sigma Model
July 9th, 2020
quantum-field-theory
lagrangian-formalism
variational-principle
action
functional-derivatives
Action and Action integral: Different kinds of variational principles
July 21st, 2020
classical-mechanics
terminology
variational-principle
action
In the Principle of Least Action, how does a particle know where it will be in the future?
May 3rd, 2020
action
lagrangian-formalism
classical-mechanics
newtonian-mechanics
quantum-mechanics
Lagrangian for Euler Equations in general relativity
August 1st, 2022
navier-stokes
action
lagrangian-formalism
research-level
general-relativity
Why are the Nambu-Goto action and Polyakov action equivalent at quantum level?
August 1st, 2022
lagrangian-formalism
path-integral
action
partition-function
string-theory
Invariance of action $\Rightarrow$ covariance of field equations?
February 23rd, 2022
invariants
covariance
action
symmetry
lagrangian-formalism
Is Einstein-Hilbert action the unique action whose variation gives Einstein's field equations?
May 13th, 2020
action
general-relativity
variational-principle
Lagrangian for relativistic massless point particle
August 1st, 2022
geodesics
action
variational-principle
lagrangian-formalism
special-relativity
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