Qmechanic

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I'm a theoretical physicist.


483 Answers

newest activity votes
3
Canonical quantization in supersymmetric quantum mechanics
1
How is the physical Lagrangian related to the constrained minimization Lagrangian?
1
Who first provided a string realization of dual resonance models?
3
Differentiation and delta function
2
Constructing the exponential form of a unitary operator
6
Why is the Yang-Mills gauge group assumed compact and semi-simple?
1
What is the capture cross-section of a black hole region for ultra-relativistic particles?
3
Representations of Lie algebras in physics
1
Problem of Landau, Lifshitz - Mechanics - Integration of the Equations of motion
9
Could negative dimension ever make sense?
2
Why lagrangian is negative number?
2
Hamiltonian or not?
12
Commutator with expontential [A, exp(B)]
4
Is it possible to write a Density Matrix in the following form?
2
A confusion about base states of a quantum system
7
Do an action and its Euler-Lagrange equations have the same symmetries?
5
Cyclic Coordinates in Hamiltonian Mechanics
3
Canonical transformation and Hamilton's equations
3
Noether theorem and classical proof of electric charge conservation
6
Can any physical rigid body be represented by an ellipsoid with the same angular dynamics?
1
Is the path of stationary action unique? What are the physical implications of $L_{\dot{x}}=L_x$
2
Phase space volume and relativity
6
What is the value of a quantum field?
1
Topology and Quantum mechanics
4
Clarifying what metric counts as flat space
13
Don't understand the integral over the square of the Dirac delta function
3
What are the strings in string theory made of?
3
Writing $\dot{q}$ in terms of $p$ in the Hamiltonian formulation
3
Obtaining the conserved current of the Lagrangian making the parameter depending on $x$
1
What is the Hubbard-Holstein model?
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