What is the intuitive concept of the action of a relativistic point particle?
132834
Trying to understand relativistic action of a massive point particle
99312
Why Lagrangian is negative number for a relativistic massive point particle?
119217
If particles are points, then aren't atoms empty space?
141128
Action of a massive free point-particle in relativistic mechanics
149592
Why do we say that irreducible representation of Poincare group represents the one-particle state?
143803
The elusive difference between force and impulse
78924
What is $c$ in the Lorentz force expression?
7477
Why is the momentum of a particle $\gamma mv$?
87259
Constraints of relativistic point particle in Hamiltonian mechanics
114901
In what sense is the proper/effective action $\Gamma[\phi_c]$ a quantum-corrected classical action $S[\phi]$?
74367
Newtonian mechanics: massless particles
34788
Lagrangian for relativistic massless point particle
158526
Finding a "Principle of Least Action" equivalent statement for Hamiltonian Mechanics
125643
Infinities in Newtons law of gravity (for point particles)
153552
Relativistic mass as seen by different observers
152110
How does $p\cdot u$ relate to observed energy and momentum for a massive particle?
12923
How can tangential acceleration from a radial force be explained?