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 Difference between the Shapiro Delay and time dilation?
  • dsaun777
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Undergrad Is the electromagnetic 4-vector indeed a 4-vector?
  • mbond
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Undergrad Is Relativistic Action for a beam of light = zero?
  • LarryS
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Undergrad Spacetime expansion - time dimension expansion
  • exander
  • · Replies 48 ·
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Undergrad Perceive Length Contraction VS Terrell Penrose
  • Albertgauss
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Undergrad Light clock running faster than light?
  • tagehedin
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Undergrad Time dilation vs Differential aging vs Redshift
  • cianfa72
  • · Replies 21 ·
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High School Why Does Black Hole Entropy and Information Loss Matter?
  • Omega0
  • · Replies 7 ·
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Undergrad Question about length contraction
  • Chenkel
  • · Replies 45 ·
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Undergrad Teaching Minkowski diagrams effectively
  • pervect
  • · Replies 15 ·
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Graduate Can We Construct a Coordinate Chart Where Bell Observers Are At Rest?
  • PeterDonis
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High School Could you use LIGO-technology to measure gravitational redshift?
  • Isambard
  • · Replies 11 ·
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Undergrad Why "time part" represents energy in Four-momentum?
  • PLAGUE
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Undergrad How do you resolve seeming contradictions in SR?
  • curiousburke
  • · Replies 76 ·
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High School Time Dilation in Non-Stationary Reference Frame: A, B, C
  • joshuadeepak
  • · Replies 10 ·
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Undergrad Proof of Invariance of Spacetime Interval
  • PLAGUE
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High School What do people mean when they say “space is flat?”
  • BadgerBadger92
  • · Replies 8 ·
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Undergrad Potential energy and the gravitational field of a collapsing cloud of gas
  • Herbascious J
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Undergrad Curved spacetime bulging in time direction
  • pahenning
  • · Replies 30 ·
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High School Gravitational Time Dilation Inside the Sun
  • Mikael17
  • · Replies 9 ·
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High School General Relativity and Universal Gravitational Constant
  • ktmsud
  • · Replies 27 ·
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High School Question about "odometer" analogy and time dilation
  • FIL
  • · Replies 34 ·
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Undergrad Question about electromagnetism and frames of reference
  • abdossamad2003
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High School How to add an object's multiple relativistic speeds from x, y, and z?
  • syfry
  • · Replies 37 ·
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Undergrad Question about Einstein's famous elevator experiment
  • Kuruwee
  • · Replies 29 ·
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Undergrad Why doesn't relativity of simultaneity lead to a contradiction?
  • m082844
  • · Replies 17 ·
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Undergrad How Does Distance to Proxima Centauri Affect Simultaneous Events?
  • Ben S
  • · Replies 2 ·
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Undergrad Energy conservation in general relativity
  • KleinMoretti
  • · Replies 12 ·
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Undergrad Speed of light after exiting a transparent medium
  • isotherm
  • · Replies 17 ·
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Undergrad Alternative Ways to Realize Invariance: Lorentz Transformation
  • msumm21
  • · Replies 20 ·
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Undergrad Simplified explanation of SR for relativity-denier
  • pellis
  • · Replies 61 ·
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High School What is m in Kinetic Energy? Relativistic mass or Rest mass?
  • Slimy0233
  • · Replies 55 ·
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Undergrad Seeing history when crossing event horizon
  • Hill
  • · Replies 41 ·
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High School Can we see 2 black holes orbiting each other?
  • HansH
  • · Replies 57 ·
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High School Does Space Recover or Oscillate After Being Distorted by Massive Objects?
  • pforeman
  • · Replies 3 ·
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High School Black hole electromagnetic spectrum
  • snorkack
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Undergrad Are the Lorentz Transformations False?
  • Leepappas
  • · Replies 54 ·
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Undergrad Can someone falsify this analogy contradicting time dilation?
  • misterously
  • · Replies 25 ·
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High School Does gravitational force act on system or its components?
  • jovi2k
  • · Replies 5 ·
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High School Where does the light energy lost due to expansion go?
  • mister i
  • · Replies 13 ·
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Undergrad What causes time dilation and length contraction
  • hababsbshshhs
  • · Replies 10 ·
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High School A thought experiment regarding special relativity
  • KyriakosTsp
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Undergrad Is the Idea of a Continuum Always an Approximation to the Physical?
  • walkeraj
  • · Replies 5 ·
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Undergrad Incomplete geodesics in a singularity, do they warrant quantum concerns?
  • walkeraj
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High School Would We See the Same Light After Traveling Back to Earth Faster Than Light?
  • markterry
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Undergrad Physical meaning of zero time metric
  • madsmh
  • · Replies 10 ·
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Graduate Do Black Holes have Singularities?
  • fresh_42
  • · Replies 20 ·
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Undergrad Tidal effects on event horizon of binary rotating BHs
  • Christian Thom
  • · Replies 6 ·
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Undergrad EFE with cosmological constant
  • grav-universe
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Undergrad Question about full Lorentz transformation
  • Chenkel
  • · Replies 101 ·
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High School Black hole evaporation mechanism
  • Gingerot
  • · Replies 4 ·
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Undergrad How Can You Approach Steve Without Being Doppler-Shifted?
  • jcsd
  • · Replies 4 ·
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High School Spacetime interval question involving a Pendulum in a Space Ship
  • Chenkel
  • · Replies 7 ·
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Undergrad What was the role of frequency in the Michelson-Morley experiment's null result?
  • MrYes
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Graduate Is there a basic example that works based on gravitoelectromagnetism?
  • sergioperezf
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High School Is the Accelerating Expansion of the Universe Wasting Energy?
  • mister i
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Undergrad Does Light Travel the Shortest Path in Curved Space-Time Around a Neutron Star?
  • Bosko
  • · Replies 82 ·
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High School What Are the Relativistic Implications for Beacon Synchronization?
  • dom_quixote
  • · Replies 25 ·
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Undergrad Isn't the speed of light tautologically 299792458 m/s?
  • Kekkuli
  • · Replies 34 ·
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High School Question about Morin's time dilation explanation
  • Chenkel
  • · Replies 73 ·
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Undergrad The speed of one photon through a transparent medium
  • isotherm
  • · Replies 74 ·
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Graduate Correspondence between areal radius differences and proper distances
  • PAllen
  • · Replies 4 ·
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Undergrad What is Earth's escape velocity?
  • binis
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Graduate How to Express the Schwarzschild Metric in Fermi Normal Coordinates?
  • Gleeson
  • · Replies 13 ·
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Undergrad Analyzing Time Dilation in a Spaceship-Mars Scenario
  • dirac26
  • · Replies 14 ·
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High School How do you project a Killing Vector onto a Schwarzschild field?
  • bobrubino
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Undergrad What Happens When an Object Accelerating Away from a Black Hole Stops?
  • Ivo Draschkow
  • · Replies 35 ·
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Undergrad How Does Special Relativity Affect Perceived Distances Between Planets?
  • dwspacetime
  • · Replies 101 ·
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Undergrad Invariant definition of acceleration in Newtonian physics vs proper acceleration in GR
  • cianfa72
  • · Replies 30 ·
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Undergrad Interpretation of (X,T) coordinates in Kruskal diagram
  • Hill
  • · Replies 34 ·
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High School Is imaginary time a fourth dimension?
  • bobrubino
  • · Replies 13 ·
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High School Minkowski Spacetime vs Euclidean Spacetime
  • bobrubino
  • · Replies 11 ·
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High School Stationary charge next to a current-carrying wire
  • lightlightsup
  • · Replies 68 ·
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Undergrad A mirror behind the event horizon
  • Bosko
  • · Replies 18 ·
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High School What does the Minkowski spacetime interval represent and how is it determined?
  • PhanthomJay
  • · Replies 20 ·
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High School Very basic questions about visualizing spacetime
  • jaketodd
  • · Replies 7 ·
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High School Question about choice of reference frame
  • Chenkel
  • · Replies 23 ·
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Undergrad Schwarzschild spacetime in Kruskal coordinates
  • cianfa72
  • · Replies 43 ·
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High School Can Motion Exceed the Speed of Light in General Relativity?
  • jaketodd
  • · Replies 20 ·
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Undergrad Effects of magnetism on spacetime curvature, and implications
  • jaketodd
  • · Replies 8 ·
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Undergrad Equation of state for Einstein field equations
  • grav-universe
  • · Replies 4 ·
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Undergrad Principle of relativity and Galileo's group
  • HighPhy
  • · Replies 10 ·
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High School How to know what maximal atlas to use for spacetime manifold?
  • Shirish
  • · Replies 12 ·
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High School What does symmetry of time dilation really mean?
  • Chenkel
  • · Replies 16 ·
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Undergrad Black hole singularity, a time-like surface?
  • Hill
  • · Replies 19 ·
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Undergrad Is it only experience that's relative?
  • Elimelech70
  • · Replies 11 ·
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Undergrad Question about the reciprocity of time dilation
  • Chenkel
  • · Replies 88 ·
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Undergrad Question about time dilation symmetry
  • Chenkel
  • · Replies 27 ·
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High School How does hawking radiation escape a black hole?
  • SheldonCooper13
  • · Replies 11 ·
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Undergrad Is there a theorem that we can't see objects getting behind EHs?
  • Pony
  • · Replies 5 ·
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High School Intuition for time dilation in a cesium clock
  • msumm21
  • · Replies 58 ·
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Graduate What Are the Must-Read Einstein Papers on General Relativity and Beyond?
  • AndreasC
  • · Replies 46 ·
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Undergrad How Do Interparticle Interactions Affect Buoyant Force in Gases?
  • Leticia
  • · Replies 0 ·
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Undergrad Linearising Christoffel symbols
  • chartery
  • · Replies 9 ·
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Undergrad Intuition regarding Riemann curvature tensor
  • Hill
  • · Replies 3 ·
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Undergrad Lie dragging vs Fermi-Walker transport along a given vector field
  • cianfa72
  • · Replies 26 ·
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High School What Is the Fourth Dimension and How Does It Work?
  • eggy
  • · Replies 3 ·
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Graduate Negative energy in Hawking radiation
  • Demystifier
  • · Replies 1 ·
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Graduate Where exactly is the wormhole in the Kruskal-Szekeres diagram?
  • haushofer
  • · Replies 43 ·
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High School A well defined thought experiment
  • Mikael17
  • · Replies 55 ·
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