Special and General Relativity Forum

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Join in expert discussion on special and general relativity discussion. Relativity is the dependence of various physical phenomena on relative motion of the observer and the observed objects.
Undergrad Falling through the event horizon of an evaporating black hole
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High School Mass defect and electron transition
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Graduate Synchronous to Newtonian gauge
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Undergrad A. P. French "Matter and Radiation: The Inertia of Energy"
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High School Excellent Free Course On Einsten, Relativity, His Views Etc from Harvard
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Undergrad Killing fields commute if they are asymptotically coordinate?
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Undergrad Meaning of the invariants built from the angular momentum tensor
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Undergrad Conservation of stress-energy tensor
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Undergrad Can the expansion of the Universe reduce the energy of a photon to 0?
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High School The relationship between mc^2 and mc^2 x 1/2
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Graduate Boundary conditions in ##\delta I=0## to derive Einstein's equations
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Undergrad Orbital Period In General Relativity
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Undergrad Strange index notation for linear transformation matrix
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Undergrad Israel Junction Conditions: Finding Continuous Metric Across Shell
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Undergrad Dark energy and conservation of energy
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Undergrad On the physical meaning of Minkowski's spacetime model
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Undergrad Why Does a Charged Box Exhibit Higher Inertia Due to Mass-Energy Equivalence?
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High School Why is it impossible to go faster than the speed of light?
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Undergrad Linearised gravity approach to Lense Thirring metric
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Graduate Retarded time and advanced time (and binning)
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Undergrad Black Holes Colliding Exactly Head On
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Graduate What does Dirac mean by "the suffixes would not balance"?
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Graduate How do we interpret measurements of Mercury's position?
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Graduate Dirac comment on tensor densities (Dirac GTR, p. 37)
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Undergrad Transition of spherically symmetric gravitation
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Graduate Dirac's coordinates ##(\tau, \rho)## for the Schwarzschild metric with ##r \le 2m##
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Graduate Variation of the kinetic term in scalar field theory
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High School Do observers always agree on the number of waves in a beam of light?
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Undergrad Questions about Hawking radiation and extremal black holes...?
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Undergrad Coordinate Transformation versus Change of Synchrony Convention
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High School Help understanding the Relativity of Simultaneity
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High School Entering a black hole -- I know I must be wrong (Help me understand why)
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Undergrad Einstein brother-in-law elevator
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Undergrad Bell's spaceship paradox
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Undergrad Ricci tensor from this action
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Undergrad How Relativistic Speeds Affect Time Perception on a Spaceship
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High School How are 'fringe shifts' in the Michelson-Morley experiment calculated?
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Undergrad Explanation for Galaxy Rotation Curves
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Undergrad One difference between GR and quantum mechanics
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Undergrad Move Stress-Energy tensor to the left side of EFE?
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Undergrad Would moving the mouths of a wormhole affect the internal distance?
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Undergrad Photon in a mirrored box moving in direction of travel
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High School Energy loss of a photon
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Undergrad Battery life on VERY fast moving object
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High School Time and right angle traveling twins paradox
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Undergrad A problem in the equations for Einstein's Special Theory of Relativity
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Undergrad What is the fabric of space-time made up of?
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Undergrad Does the speed of light pop out of other theories than EM?
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Undergrad Why are rotated parallel axes still parallel?
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High School Prove that metric tensor is covariant constant
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Undergrad How relative is the magnetic field of a current carrying conductor?
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Undergrad The answer for the total mass of the Universe?
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Graduate Movement vs expansion in space
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Undergrad Does potential energy curve spacetime?
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Undergrad Relativity of Simultaneity and Length Contraction
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Graduate Why ##A_{\nu:\sigma}=0## in flat space?
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Undergrad Mathematical problem with Schwarzschild spacetime?
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High School Gravitational potential energy, a thought experiment
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High School New Paradox Discovered, I Think
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Undergrad Dirac comment on covariant derivatives
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Undergrad Deriving the relativistic rocket equation with exhaust efficiency
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Undergrad Lorentz Transformations Confusion
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High School Does the age of the Universe differ for observers in expanding space?
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Undergrad Newton Galilean spacetime as fiber bundle
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Graduate Coupling torsion to electromagnetism and torsion tensor decomposition
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Undergrad Galaxy recession and Universe expansion
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Undergrad Is momentum conserved as a body falls through a gravitational field?
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Undergrad Does Kerr's argument against singularities apply to all black holes?
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Undergrad Doppler and Searchlight (Headlight)
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Undergrad Difference between the Shapiro Delay and time dilation?
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Undergrad Is the electromagnetic 4-vector indeed a 4-vector?
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Undergrad Is Relativistic Action for a beam of light = zero?
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Undergrad Spacetime expansion - time dimension expansion
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Undergrad Perceive Length Contraction VS Terrell Penrose
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Undergrad Light clock running faster than light?
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Undergrad Time dilation vs Differential aging vs Redshift
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High School Why Does Black Hole Entropy and Information Loss Matter?
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Undergrad Question about length contraction
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Undergrad Teaching Minkowski diagrams effectively
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Graduate Can We Construct a Coordinate Chart Where Bell Observers Are At Rest?
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High School Could you use LIGO-technology to measure gravitational redshift?
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Undergrad Why "time part" represents energy in Four-momentum?
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Undergrad How do you resolve seeming contradictions in SR?
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High School Time Dilation in Non-Stationary Reference Frame: A, B, C
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Undergrad Proof of Invariance of Spacetime Interval
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High School What do people mean when they say “space is flat?”
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Undergrad Potential energy and the gravitational field of a collapsing cloud of gas
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Undergrad Curved spacetime bulging in time direction
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High School Gravitational Time Dilation Inside the Sun
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High School General Relativity and Universal Gravitational Constant
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High School Question about "odometer" analogy and time dilation
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Undergrad Question about electromagnetism and frames of reference
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High School How to add an object's multiple relativistic speeds from x, y, and z?
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Undergrad Question about Einstein's famous elevator experiment
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Undergrad Why doesn't relativity of simultaneity lead to a contradiction?
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Undergrad How Does Distance to Proxima Centauri Affect Simultaneous Events?
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Undergrad Energy conservation in general relativity
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Undergrad Speed of light after exiting a transparent medium
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Undergrad Alternative Ways to Realize Invariance: Lorentz Transformation
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Undergrad Simplified explanation of SR for relativity-denier
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