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.
I Dirac comment on covariant derivatives
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I Lorentz Transformations Confusion
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B Does the age of the Universe differ for observers in expanding space?
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I Newton Galilean spacetime as fiber bundle
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I Macroscopic objects in free-fall
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A Coupling torsion to electromagnetism and torsion tensor decomposition
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I Galaxy recession and Universe expansion
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I Is momentum conserved as a body falls through a gravitational field?
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I Does Kerr's argument against singularities apply to all black holes?
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I Doppler and Searchlight (Headlight)
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I Difference between the Shapiro Delay and time dilation?
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I Is the electromagnetic 4-vector indeed a 4-vector?
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I Is Relativistic Action for a beam of light = zero?
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I Spacetime expansion - time dimension expansion
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I Perceive Length Contraction VS Terrell Penrose
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I Light clock running faster than light?
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I Time dilation vs Differential aging vs Redshift
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B Why Does Black Hole Entropy and Information Loss Matter?
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I Question about length contraction
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I Teaching Minkowski diagrams effectively
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A Can We Construct a Coordinate Chart Where Bell Observers Are At Rest?
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B Could you use LIGO-technology to measure gravitational redshift?
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I Why "time part" represents energy in Four-momentum?
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I How do you resolve seeming contradictions in SR?
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B Time Dilation in Non-Stationary Reference Frame: A, B, C
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I Proof of Invariance of Spacetime Interval
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B What do people mean when they say “space is flat?”
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I Potential energy and the gravitational field of a collapsing cloud of gas
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I Curved spacetime bulging in time direction
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B Gravitational Time Dilation Inside the Sun
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B General Relativity and Universal Gravitational Constant
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B Question about "odometer" analogy and time dilation
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I Question about electromagnetism and frames of reference
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B How to add an object's multiple relativistic speeds from x, y, and z?
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I Question about Einstein's famous elevator experiment
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I Why doesn't relativity of simultaneity lead to a contradiction?
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I How Does Distance to Proxima Centauri Affect Simultaneous Events?
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I Energy conservation in general relativity
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I Speed of light after exiting a transparent medium
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I Alternative Ways to Realize Invariance: Lorentz Transformation
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I Simplified explanation of SR for relativity-denier
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B What is m in Kinetic Energy? Relativistic mass or Rest mass?
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I Seeing history when crossing event horizon
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B Can we see 2 black holes orbiting each other?
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B Does Space Recover or Oscillate After Being Distorted by Massive Objects?
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B Black hole electromagnetic spectrum
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I Are the Lorentz Transformations False?
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I Can someone falsify this analogy contradicting time dilation?
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B Does gravitational force act on system or its components?
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B Where does the light energy lost due to expansion go?
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I What causes time dilation and length contraction
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B A thought experiment regarding special relativity
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I Is the Idea of a Continuum Always an Approximation to the Physical?
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I Incomplete geodesics in a singularity, do they warrant quantum concerns?
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B Would We See the Same Light After Traveling Back to Earth Faster Than Light?
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I Physical meaning of zero time metric
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A Do Black Holes have Singularities?
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I Tidal effects on event horizon of binary rotating BHs
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I EFE with cosmological constant
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I Question about full Lorentz transformation
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B Black hole evaporation mechanism
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I How Can You Approach Steve Without Being Doppler-Shifted?
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B Spacetime interval question involving a Pendulum in a Space Ship
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I What was the role of frequency in the Michelson-Morley experiment's null result?
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A Is there a basic example that works based on gravitoelectromagnetism?
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B Is the Accelerating Expansion of the Universe Wasting Energy?
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I Does Light Travel the Shortest Path in Curved Space-Time Around a Neutron Star?
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B What Are the Relativistic Implications for Beacon Synchronization?
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I Isn't the speed of light tautologically 299792458 m/s?
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B Question about Morin's time dilation explanation
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I The speed of one photon through a transparent medium
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A Correspondence between areal radius differences and proper distances
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I What is Earth's escape velocity?
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A How to Express the Schwarzschild Metric in Fermi Normal Coordinates?
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I Analyzing Time Dilation in a Spaceship-Mars Scenario
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B How do you project a Killing Vector onto a Schwarzschild field?
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I What Happens When an Object Accelerating Away from a Black Hole Stops?
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I How Does Special Relativity Affect Perceived Distances Between Planets?
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I Invariant definition of acceleration in Newtonian physics vs proper acceleration in GR
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I Interpretation of (X,T) coordinates in Kruskal diagram
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B Is imaginary time a fourth dimension?
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B Minkowski Spacetime vs Euclidean Spacetime
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B Stationary charge next to a current-carrying wire
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I A mirror behind the event horizon
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B What does the Minkowski spacetime interval represent and how is it determined?
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B Very basic questions about visualizing spacetime
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B Question about choice of reference frame
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I Schwarzschild spacetime in Kruskal coordinates
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B Can Motion Exceed the Speed of Light in General Relativity?
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I Effects of magnetism on spacetime curvature, and implications
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I Equation of state for Einstein field equations
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B How to know what maximal atlas to use for spacetime manifold?
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B What does symmetry of time dilation really mean?
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I Black hole singularity, a time-like surface?
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I Is it only experience that's relative?
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I Question about the reciprocity of time dilation
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I Question about time dilation symmetry
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B How does hawking radiation escape a black hole?
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I Is there a theorem that we can't see objects getting behind EHs?
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B Intuition for time dilation in a cesium clock
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