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Nov
21
comment Spacetime, space observables and time observables
For exposure to how much attention is actually given to the nature of space-time as a geometric structure (i.e., manifolds equipped with non-degenerate metrics) see Hawking and Eliis' the Large Scale Structure of Space-Time.
Nov
20
comment Is the orbit in Schwarzshild metric a path with maximal proper time?
Very good question; may I refer you to the following posted question. I think you may take something from the answer. physics.stackexchange.com/questions/18781/…
Nov
20
answered Is the orbit in Schwarzshild metric a path with maximal proper time?
Nov
20
comment Is there a scientific term for star formation?
I really think that as an unbrella term for the entire subject discipline; Star Formation is widely used and accepted as the term of choice.
Nov
17
answered What's the escape velocity of Naked Singularities?
Nov
17
answered About the definition of the Møller operator
Nov
14
awarded  Yearling
Nov
13
comment Classical mechanics textbook recommendation
Goldstein is really the best on the market, can be pricey but worth it.
Nov
13
answered Harmonics on Hyperbolic space
Nov
13
answered Complex Conjugate of Wave Function
Nov
13
comment How does the Lorentz transformation $\Lambda^{\mu}{}_{\nu}$ transform?
@user22207 qute right, had a brain melt there; updated to reflect your point. Many thanks, A.
Nov
13
awarded  Editor
Nov
13
revised How does the Lorentz transformation $\Lambda^{\mu}{}_{\nu}$ transform?
deleted 99 characters in body
Nov
13
answered De Donder Weyl theory
Nov
13
answered How does the Lorentz transformation $\Lambda^{\mu}{}_{\nu}$ transform?
Nov
13
comment 2 Component Spinor Formalism
Somebody asked me the same question (in private) a month or so ago; she returned to me with this pdf which helped her immensely; I wonder if it helps you too, c.f., pages 199-201 physics.indiana.edu/~dermisek/QFT_09/qft-I-9-4p.pdf
Nov
13
answered Why do the storms of Jupiter have long life unlike that of Earth?
Nov
12
comment Why isn't the path integral defined for non homotopic paths?
@jinawee Hmmn, I may be confusing the situation here but isn't is true that the domains are (formally) extended through an analytic continuation (in definition of the domain); doesn't simply connectedness become paramount in the definition since the application of a monodromy theorem demands it?
Nov
12
comment Why isn't the path integral defined for non homotopic paths?
Isn't it just down to the definition of path-homotopy? I mean, by definition, the end-points have to be the same and all paths lying in between are the homotpy class. I think this is just a consequence of the homotopy class being end-point preserving.
Nov
12
comment Modelling gravitational potential of a galaxy
Try a "mixed" boundary condition, which satisfy both a Nuemann and a Dirichlet boundary value problem. The key element of a mixed BV problem is that you can find solutions to the equations on disjoint parts of the boundary (essentially here, if I have understood your problem correctly, you are trying to solve the Poisson equation on a spiral arm). See en.wikipedia.org/wiki/Mixed_boundary_condition