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- Riemann curvature tensor and Ricci tensor for the 2-d surface of a sphere
- Christoffel symbol exercise: calculation in polar coordinates part II
- Riemann curvature tensor part I: derivation from covariant derivative commutator
- Christoffel Symbol or Connection coefficient
- Metric tensor exercise: calculation for the surface of a sphere
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According to Scientific American, the astronomers of the Event Horizon Telescope have scheduled their first full-on attempt to image the black hole at the center of the Milky Way for next spring
In April 2017, eight observatories around the world—including the Atacama Large Millimeter Array (ALMA) and the South Pole Telescope—will simultaneously observe Sagittarius A* , the supermassive black hole at the center of Milky Way.
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A interesting course introducing into General Theory of Relativity has started on Coursera.
Commitment: 12 weeks of study, 4-6 hours per week
More information there Introduction into General Theory of Relativity
Read more: Introduction into General Theory of Relativity on Coursera
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I have recenly registered to a physics forum website https://www.physicsforums.com/, where i was paying special interest to Special and General Relativity category.
A few days ago, there was a discussion about the interval transformations under Lorentz transformations.
Some contributors/moderators there don't seem to believe that the space and time coordinate differences Δx or Δt do transform under Lorentz transformations (which is obvious due to the linearity of the transformation) or that these intervals could even be used to demonstrate the length contraction or time dilation phenomena, simply showing that they don't understand even the basis and real signification of the Lorentz transformation!
