User rsaavedra

7 votes

3 answers

2k views

Free energy functions are analytic or non-analytic in phase transitions?

asked Jun 20, 2017 at 17:05

6 votes

1 answer

355 views

Choosing a conserved quantity to obtain a symmety via Noether's Inverse Theorem

homework-and-exercises lagrangian-formalism conservation-laws symmetry noethers-theorem

asked Sep 12, 2016 at 23:35

5 votes

1 answer

155 views

Parametric and covariant expressions for the acceleration vector

classical-mechanics acceleration curvature covariance

asked Aug 27, 2016 at 14:11

5 votes

2 answers

631 views

Noether's theorem for time dependent non-cyclic Lagrangian

homework-and-exercises lagrangian-formalism symmetry noethers-theorem

asked Dec 22, 2016 at 23:36

5 votes

1 answer

374 views

What is a quasi-axisymmetric stellarator?

magnetic-fields plasma-physics fusion

asked Sep 28, 2018 at 21:53

4 votes

2 answers

4k views

Electric octupole moment in cartesian coordinates

potential tensor-calculus multipole-expansion

asked Jul 25, 2016 at 0:35

4 votes

2 answers

1k views

Proof of the Gauge-invariant momentum operator

quantum-mechanics homework-and-exercises operators momentum gauge-invariance

asked Nov 27, 2016 at 19:55

3 votes

1 answer

3k views

Derivation of Euler-Lagrange equations from Hamilton's and D'Alembert's principle

classical-mechanics lagrangian-formalism variational-principle constrained-dynamics

asked Nov 30, 2016 at 0:33

3 votes

2 answers

4k views

Number of degrees of freedom of the coupled pendulum problem

lagrangian-formalism spring coupled-oscillators

asked Sep 5, 2016 at 22:36

2 votes

3 answers

432 views

Is it valid to replace the equations of motion inside a symmetry?

lagrangian-formalism symmetry equations-of-motion

asked Sep 23, 2016 at 0:33

2 votes

1 answer

172 views

Restriction of an operator

quantum-mechanics operators hilbert-space commutator linear-algebra

asked Aug 30, 2016 at 3:49

2 votes

0 answers

51 views

N-dimensional tori for integrable systems with bounded motion

hamiltonian-formalism phase-space integrable-systems

asked Dec 13, 2016 at 19:13

2 votes

1 answer

84 views

Calculation of the standard symplectic space matrix

classical-mechanics differential-geometry hamiltonian-formalism phase-space poisson-brackets

asked Oct 27, 2016 at 0:49

1 vote

1 answer

1k views

Stationary states parity of an Anisotropic Harmonic Oscillator

quantum-mechanics homework-and-exercises harmonic-oscillator parity

asked Nov 6, 2016 at 19:06

1 vote

1 answer

513 views

Time evolution of mean values for a two-particle system

quantum-mechanics homework-and-exercises harmonic-oscillator

asked Nov 8, 2016 at 21:00

1 vote

1 answer

377 views

Hessian condition for solving Hamilton-Jacobi equation

classical-mechanics hamiltonian-formalism coordinate-systems phase-space

asked Dec 24, 2016 at 3:30

1 vote

0 answers

160 views

Canonical transformations including time

classical-mechanics hamiltonian-formalism

asked Jan 2, 2017 at 20:07

1 vote

1 answer

202 views

Hoop spinning around fixed cylinder

homework-and-exercises classical-mechanics rotational-kinematics

asked Jan 7, 2017 at 0:39

1 vote

2 answers

455 views

Showing the invariance of the equations of motion

lagrangian-formalism noethers-theorem equations-of-motion

asked Sep 26, 2016 at 19:56

1 vote

1 answer

78 views

Smallest relative velocity driving a two-stream instability

frequency plasma-physics stability dispersion

asked Jun 29, 2017 at 4:55

0 votes

1 answer

276 views

Drift kinetic equation orderings

plasma-physics kinetic-theory non-equilibrium

asked Nov 29, 2017 at 19:46

0 votes

0 answers

60 views

Diffusion equation in energy and magnetic surface coordinates

coordinate-systems plasma-physics kinetic-theory diffusion

asked Feb 5, 2018 at 19:04

0 votes

1 answer

124 views

Infinitesimal transformation of a state function

classical-mechanics conservation-laws coordinate-systems

asked Sep 12, 2016 at 0:24

0 votes

1 answer

852 views

Lagrangian for a system of particles

homework-and-exercises classical-mechanics lagrangian-formalism

asked Sep 4, 2016 at 4:19

0 votes

1 answer

396 views

Total derivative of the Lagrangian with respect to the action?

lagrangian-formalism differentiation action

asked Aug 27, 2016 at 18:55

0 votes

1 answer

181 views

Assymmetric top with time-varying moment of inertia

homework-and-exercises classical-mechanics moment-of-inertia rigid-body-dynamics

asked Jan 7, 2017 at 1:21

0 votes

1 answer

607 views

Stability analysis: small perturbations vs second derivative test

homework-and-exercises classical-mechanics stability

asked Jan 14, 2017 at 0:17

0 votes

1 answer

358 views

Maxwell-Boltzmann statistics partition function: N! or multinomial coefficient?

statistics partition-function quantum-statistics

asked Jun 20, 2017 at 15:11

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28 Questions

Free energy functions are analytic or non-analytic in phase transitions?

Choosing a conserved quantity to obtain a symmety via Noether's Inverse Theorem

Parametric and covariant expressions for the acceleration vector

Noether's theorem for time dependent non-cyclic Lagrangian

What is a quasi-axisymmetric stellarator?

Electric octupole moment in cartesian coordinates

Proof of the Gauge-invariant momentum operator

Derivation of Euler-Lagrange equations from Hamilton's and D'Alembert's principle

Number of degrees of freedom of the coupled pendulum problem

Is it valid to replace the equations of motion inside a symmetry?

Restriction of an operator

N-dimensional tori for integrable systems with bounded motion

Calculation of the standard symplectic space matrix

Stationary states parity of an Anisotropic Harmonic Oscillator

Time evolution of mean values for a two-particle system

Hessian condition for solving Hamilton-Jacobi equation

Canonical transformations including time

Hoop spinning around fixed cylinder

Showing the invariance of the equations of motion

Smallest relative velocity driving a two-stream instability

Drift kinetic equation orderings

Diffusion equation in energy and magnetic surface coordinates

Infinitesimal transformation of a state function

Lagrangian for a system of particles

Total derivative of the Lagrangian with respect to the action?

Assymmetric top with time-varying moment of inertia

Stability analysis: small perturbations vs second derivative test

Maxwell-Boltzmann statistics partition function: N! or multinomial coefficient?