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location Buenos Aires, Argentina
age 21
visits member for 3 years, 2 months
seen 33 mins ago

2h
comment Making precise the statement “particles are excitations in a quantum field”
Thanks for you answer. You say that time evolution will act differentlyon many particles states than it will on one particle states; that is clear to me. But the field, while it is an operator that may not even be observable, does have a value (taken from a space of operators, of course), and it does have a time evolution. Am I correct in saying that that evolution depends only on the Hamiltonian/Lagrangian of the theory and not on the state in Hilbert space?
6h
asked Making precise the statement “particles are excitations in a quantum field”
1d
reviewed Approve Higher rank $\gamma$-matrix question
1d
reviewed Approve Electron/positron annihilation lines in astrophysics
1d
reviewed Approve How will the Twin Paradox become, for Time Dilation, if no acceleration was ever involved?
2d
answered Turning off point for 1g acceleration
2d
comment Why is every particle a sphere?
They are point particles, but a point is hard to draw so they're usually shown as spheres.
2d
reviewed Reject aCould it be possible that the universe doesn't exist
2d
comment Does lunar module need the same amount of fuel for landing and take off?
I don't think crash landing is under consideration. But if it is, it trivially requires less fuel than take off.
2d
comment Does lunar module need the same amount of fuel for landing and take off?
Gravity is also there when you take off, so I'm not sure that would make a difference.
Dec
18
reviewed Approve The gravitational constant $G$ theoretically?
Dec
18
reviewed Approve How does light speed up after coming out of a glass slab?
Dec
18
comment Questioning Einstein's view on gravity
While original thinking is a valuable thing and I think it's great that you analyze critically what you hear, do you really think you can overthrow 100 years of established knowledge with a simple thought experiment?
Dec
16
reviewed Approve Non-locality in non-relativistic Quantum Mechanic
Dec
15
comment Understaning Euclidean Green's function
@Marion: Because $(\Box-m^2)\phi_i(x-y) = -\delta(x-y)$.
Dec
15
comment Understaning Euclidean Green's function
Sorry, the signs confused me too. (4) is correct, the problem is in the red part; the second of these (and the last line) should have a minus sign.
Dec
15
answered Understaning Euclidean Green's function
Dec
14
comment For the Uncertainty Principle, Do the Units of the Two Complementary Quantities have to Equal Js?
The uncertainty principle is no different from any other physical equation. Unless a specific system of units is being specified, the dimensions of each side should match.
Dec
14
comment What specific type of light on the EM spectrum has the longest wavelength and has been defined?
I'm not sure if I understand the question, but long wavelengths aren't particularly hard to produce. Digital AC generators usually go down to frequencies of a fraction of a Hz.
Dec
13
comment Whats the point in conserving electricity if the AC current produced cannot be stored?
I remember reading somewhere that the energy bounces back if you don't use it (note that energy $\neq$ current!).