Reputation
532
Next privilege 1,000 Rep.
Create new tags
Badges
2 10
Newest
 Excavator
Impact
~11k people reached

10h
comment Scale invariance and stress energy tensor
@ParthaPaul I suggest you use web-links rather than textual references. They are quicker to check out. After all the hypertext concept was invented/propelled by physicists at CERN.
10h
comment Derivation of Euler-Lagrange equation from principle of least action
@GiorgioComitini Peccato! I was hoping for an inside tip :-) I guess i will stick to Lyx for now.
11h
comment Derivation of Euler-Lagrange equation from principle of least action
@GiorgioComitini I also ask you: what kind of Tex editor (if any) did you use?
11h
comment Derivation of Euler-Lagrange equation from principle of least action
@GiorgioComitini I always support compactly supported arguments, so for me....+1 :-)
11h
comment Derivation of Euler-Lagrange equation from principle of least action
@123hoedjevan, Giorgio is correct. His answer is the rigorous statement and proof of the least action principle and EOMs. Nevertheless I do not think is useful to down vote your answer, but rather encourage you to change your arguments, so that your answer is correct too. I like your TEXing very much, what tex editor (if any) did you use? For me...+1
12h
comment Construct an effective field theory of neutrino mass
where is this text taken from?
1d
comment Why is the covariant derivative of the determinant of the metric zero?
We probably misunderstand each other, but -from what you write - it would seem that any polynomial function of metric components , such as $f=g_{00}^2$, is covariantly constant which is not the case. I do not think at the moment that there is a simple heuristic/intuitive justification for the constancy of the determinant. You just have to take the definition and make the calculations
1d
comment Why is the covariant derivative of the determinant of the metric zero?
Qmechanic I do not really understand your heuristic explanation. Following your logic it would seem that any simple product of metric components should be covariantly constant. But it's not
Apr
20
answered Orthogonal of tangent vector in Rindler coordinates
Apr
16
awarded  Excavator
Apr
16
revised What is the utility of ADM decomposition of the space-time metric?
edited grammar
Apr
16
suggested approved edit on What is the utility of ADM decomposition of the space-time metric?
Apr
16
answered Does metric signature affect the stress energy tensor?
Apr
1
comment Einstein wrote $x^4=ict$, where $c$ is the speed of light. Does this mean the fourth dimension is moving?
this is obviously an April's fools question. It is amazing to see so many fine physicists scrambling to give an intelligent answer to a silly question. It is always wise to check the profile of the OP before answering.
Mar
30
comment Do gravitational waves travelling through a medium produce sound?
@ChrisWhite of course! but in principle the further the wave goes from the hole, the more gravitationally redshifted it will be. This is a gedanken experiment, so everybody is equipped with infinitely sensitive sensors....and hears.
Mar
30
comment What is the explicit form of $\tau^{\alpha\beta}$ in the linearized Einstein field equations $\Box h^{\alpha\beta}=-16\pi\tau^{\alpha\beta}$?
Can you please link the specific article in Wikipedia?
Mar
29
answered Do gravitational waves travelling through a medium produce sound?
Mar
29
revised Function to model deformed spacetime in 2D visualization of an Alcubierre drive
edited whole answer
Mar
29
answered Function to model deformed spacetime in 2D visualization of an Alcubierre drive
Mar
26
awarded  Explainer