Minkowski metric - to sperical coordinates transformation

soi
Messages
4
Reaction score
0
I need to transform cartesian coordinates to spherical ones for Minkowski metric.
Taking:
(x0, x1, x2, x3) = (t, r, α, β)

And than write down all Christoffel symbols for it.

I really have no clue, but from other examples I've seen i should use chain rule in first and symmetry of Christoffel symbol Tab=Tba
 
Physics news on Phys.org
soi said:
I need to transform cartesian coordinates to spherical ones for Minkowski metric.
Taking:
(x0, x1, x2, x3) = (t, r, α, β)

And than write down all Christoffel symbols for it.

I really have no clue, but from other examples I've seen i should use chain rule in first and symmetry of Christoffel symbol Tab=Tba

The spherical form of the Minkowsky metric is just

ds^{2} = c^2 dt^2 - dr^2 - r^2 d\theta^2 - r^2 sin^2(\theta) d\phi^2

So the metric components are
g_{tt} = c^2
g_{rr} = -1
g_{\theta\theta} = -r^2
g_{\phi\phi} = -r^2 sin^2(\theta)

The connection coefficients \Gamma_{uvw} are computed in terms of the metric components via:

\Gamma_{uvw} = \frac{1}{2} (\partial_{v} g_{uw} + \partial_{w} g_{vu} - \partial_{u} g_{vw})
 
OK, great thanks for your help.

To look if I understand it, i calculated it using formula
http://upload.wikimedia.org/wikipedia/en/math/f/f/d/ffdb897152259f912ad9c4d5ab3d474d.png

And i got what you got (not surprisingly) but with -1 everywhere:

gtt=-1
grr=1
gθθ=r^2
gββ=r^2(sinθ)^2

And Christoffel symbols (nonzoro, numering metric matrix from 0 to 3):
T221=1/r
T122=-r
T331=1/r
T332=1/2(rsinθ)^2
T133=-r (sinθ)^2
T233=(sin2θ)/2

Is it okay?
 
Thread 'Can this experiment break Lorentz symmetry?'
1. The Big Idea: According to Einstein’s relativity, all motion is relative. You can’t tell if you’re moving at a constant velocity without looking outside. But what if there is a universal “rest frame” (like the old idea of the “ether”)? This experiment tries to find out by looking for tiny, directional differences in how objects move inside a sealed box. 2. How It Works: The Two-Stage Process Imagine a perfectly isolated spacecraft (our lab) moving through space at some unknown speed V...
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. The Relativator was sold by (as printed) Atomic Laboratories, Inc. 3086 Claremont Ave, Berkeley 5, California , which seems to be a division of Cenco Instruments (Central Scientific Company)... Source: https://www.physicsforums.com/insights/relativator-circular-slide-rule-simulated-with-desmos/ by @robphy
Does the speed of light change in a gravitational field depending on whether the direction of travel is parallel to the field, or perpendicular to the field? And is it the same in both directions at each orientation? This question could be answered experimentally to some degree of accuracy. Experiment design: Place two identical clocks A and B on the circumference of a wheel at opposite ends of the diameter of length L. The wheel is positioned upright, i.e., perpendicular to the ground...
Back
Top