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.
High School Can mass/energy simply be distorted spacetime?
  • physicsisdope
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Undergrad Principle of relativity in the proof of invariance of interval
  • Mike_bb
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Undergrad Why are we looking for a graviton?
  • revnice
  • · Replies 16 ·
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Undergrad Epstein diagrams and a traveling ship
  • Myslius
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Graduate Ricci tensor for Fermi normal coordinates
  • TimWilliams87
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High School Time Travel: Is it Physically Possible? | Scientific American
  • jedishrfu
  • · Replies 13 ·
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Undergrad Question about geometrical engineering (placeholder name)
  • Amazium
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Graduate "Looks" of gravitational wave emissions for an eclipsing ternary compact object?
  • snorkack
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Graduate Is parallel transport exactly norm-preserving or only approximately?
  • Kostik
  • · Replies 21 ·
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High School No object actually approaches the speed of light
  • Atlan0001
  • · Replies 9 ·
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Undergrad What does g00 element of the Schwarzschild metric tensor tell us?
  • ongoer
  • · Replies 28 ·
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High School Can anything work (including human brains) inside a black hole?
  • Manan
  • · Replies 22 ·
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Undergrad Integral subbundle of 6 KVFs gives a spacetime foliation by 3d hypersurfaces
  • cianfa72
  • · Replies 22 ·
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Undergrad A textbook passage describing coordinate lines in physical space
  • gnnmartin
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High School When I jump up and down what is the Einsteinian way to describe it?
  • ESponge2000
  • · Replies 39 ·
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Undergrad Twin Paradox Resolution
  • CSnowden
  • · Replies 4 ·
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Undergrad Notion of parallel worldlines in curved geometry
  • cianfa72
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High School Question about “Inertia arises from interaction with the Universe’s mass”
  • ESponge2000
  • · Replies 13 ·
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Graduate Landau-Lifshitz pseudotensor - expressing the EM tensor ##T^{ik}##
  • Kostik
  • · Replies 6 ·
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High School Space travel and time dilation
  • Stas1234
  • · Replies 15 ·
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15
Undergrad Where is the mass in a black hole?
  • snorkack
  • · Replies 8 ·
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Undergrad Can light be reflected in a black hole?
  • happyparticle
  • · Replies 22 ·
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Undergrad Reconciling smooth spacetime with variable, rotating, earth gravity
  • John Helly
  • · Replies 4 ·
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High School Is Gravity an illusion of a force but really a curvature of spacetime?
  • ESponge2000
  • · Replies 26 ·
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High School Meaningfulness of the speed of light
  • ginevradabenci
  • · Replies 25 ·
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Undergrad Measuring the Spacetime Interval with a Ruler
  • Trysse
  • · Replies 21 ·
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Undergrad Does the metric in general relativity depend only on position because of the equivalence principle?
  • ahmadphy
  • · Replies 16 ·
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High School One-Way Speed of Light
  • shawnhcorey
  • · Replies 93 ·
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High School If light beam travels through a vacuum, then through diamond, then through more vacuum...
  • ESponge2000
  • · Replies 15 ·
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Undergrad CTC on FLRW cosmological models
  • cianfa72
  • · Replies 6 ·
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Undergrad About the meaning of "expanding universe"
  • cianfa72
  • · Replies 16 ·
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Graduate Vanishing of an integral of a divergence over a closed surface
  • Kostik
  • · Replies 1 ·
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Undergrad Spacetime topology of the Universe
  • cianfa72
  • · Replies 9 ·
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Undergrad Clock rate in hyperbolic space-time manifold
  • wreveley
  • · Replies 1 ·
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Undergrad E=mc^2 and acceleration
  • cianfa72
  • · Replies 26 ·
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Undergrad [SR] light shot at an angle in a moving train
  • roomie10
  • · Replies 5 ·
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Graduate Velocity Verlet for relativistic simulation
  • Philip Koeck
  • · Replies 2 ·
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Undergrad Relativistic Doppler effect and refraction
  • ahmadphy
  • · Replies 10 ·
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Undergrad "Exploring Time Perception Across Different Regions of Space"
  • EntropicThinker
  • · Replies 20 ·
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Undergrad Black hole and coordinate time from the perspective of Alice outside
  • Bellaella
  • · Replies 26 ·
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High School Do all events in my past lightcone have fewer past events in theirs?
  • ESponge2000
  • · Replies 14 ·
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Graduate Dirac on localization of energy in the gravitational field
  • Kostik
  • · Replies 16 ·
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Undergrad Field equation interpretation
  • Yoel
  • · Replies 9 ·
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Undergrad Black hole formation and infinite redshift
  • LightPhoton
  • · Replies 8 ·
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Undergrad Two-way light speed invariance
  • cianfa72
  • · Replies 17 ·
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High School A question about the self consistency principle
  • BadgerBadger92
  • · Replies 3 ·
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High School Prove the velocity of a moving object is absolute in one IRF?
  • ESponge2000
  • · Replies 22 ·
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Undergrad Are equations for spacetime intervals correct?
  • Mike_bb
  • · Replies 6 ·
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Undergrad Is there a maximum relativistic acceleration?
  • Arend
  • · Replies 29 ·
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High School Drawing a Minkowski diagram to show multiple Points of View
  • DaveC426913
  • · Replies 7 ·
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Undergrad Why is Rømer's light speed measurement not one-way?
  • Warp
  • · Replies 42 ·
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High School Does Spacetime Have Physical Existence?
  • Uncle Thi
  • · Replies 58 ·
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Graduate Value of quintessence while studying black hole thermodynamics
  • djymndl07
  • · Replies 1 ·
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Undergrad Relativity of Simultaneity question (use Einstein synchronization)
  • ESponge2000
  • · Replies 5 ·
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Undergrad How to correctly mark event B on the picture?
  • Mike_bb
  • · Replies 6 ·
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Undergrad Non-Inertial Relativistic Dynamics
  • Halc
  • · Replies 18 ·
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Graduate The wave vector ##k_\mu## in curved spacetime
  • Kostik
  • · Replies 4 ·
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Undergrad Chain of lights falling into a black hole
  • timmdeeg
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Graduate Spacetime model of evaporating black hole
  • Dale
  • · Replies 51 ·
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Undergrad An alternative derivation of the equation of motion in General Relativity
  • Bishal Banjara
  • · Replies 0 ·
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Undergrad Alive in one frame and dead relative to other?
  • ahmadphy
  • · Replies 50 ·
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Undergrad You can't actually enter a blackhole?
  • blackholesarecool
  • · Replies 40 ·
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Graduate Dirac's derivation of the action/Lagrangian for a free particle
  • Kostik
  • · Replies 3 ·
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Undergrad Relating orthogonal accelerations in special relativity
  • LightPhoton
  • · Replies 1 ·
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High School Simplest symmetrical time dilation question
  • GR86
  • · Replies 16 ·
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High School Einstein thought experiment confusion: “light clock in a moving frame”
  • ESponge2000
  • · Replies 5 ·
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Undergrad Angles between 4-vectors in special relativity?
  • LightPhoton
  • · Replies 5 ·
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Undergrad Confusion about Cauchy surfaces
  • Dale
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High School Is SpaceTime just DistanceTime?
  • FRANKENSTEIN54
  • · Replies 11 ·
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Undergrad Lecture on Newtonian spacetime
  • Dale
  • · Replies 27 ·
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High School The ONE Ring has been Found
  • jedishrfu
  • · Replies 2 ·
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High School Theories about light and time near a black hole
  • GR86
  • · Replies 20 ·
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High School Lowering a rope through the event horizon
  • GR86
  • · Replies 12 ·
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Undergrad Path independence redshift photon
  • wnvl2
  • · Replies 19 ·
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Undergrad Charged particles and electromagnetic waves in transparent media
  • member 743765
  • · Replies 22 ·
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Undergrad Lasting effects of Mass and Distance Dilation
  • Jkreider48
  • · Replies 45 ·
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Undergrad The Faraday disk in the context of the theory of relativity
  • Ivan Nikiforov
  • · Replies 84 ·
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Undergrad 2 objects of enormous volume each in relative motion very close to c
  • ESponge2000
  • · Replies 8 ·
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Undergrad When Does a Train Passenger Experience Complete Darkness in a Tunnel?
  • ESponge2000
  • · Replies 40 ·
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Undergrad Matrix form of metric component transformation?
  • farfromdaijoubu
  • · Replies 1 ·
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Undergrad Energy and reference frames
  • Ivan Nikiforov
  • · Replies 87 ·
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Undergrad GR as Gauge Theory
  • fresh_42
  • · Replies 2 ·
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High School Can we say that everything on the planet is made up of energy or matter?
  • EVANDRUH
  • · Replies 5 ·
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Graduate A better way of talking about time?
  • Yuras
  • · Replies 96 ·
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Undergrad Are Space and Time Just an Illusion in General Relativity?
  • brotherbobby
  • · Replies 6 ·
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Graduate Curvature with different connections on the two-sphere
  • pervect
  • · Replies 15 ·
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Undergrad Determinism & General Relativity: A Physics Primer
  • intravenous
  • · Replies 17 ·
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Undergrad Transformation Riemann tensor to an accelerating frame
  • wnvl2
  • · Replies 10 ·
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Undergrad SR: GA Multivector vs. Tensor notation, Maxwell's equations
  • Sagittarius A-Star
  • · Replies 7 ·
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Undergrad Time dilation for two observers in relative motion
  • Raytele
  • · Replies 10 ·
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Undergrad Electromagnetic field in different reference frames
  • Jokar
  • · Replies 23 ·
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Graduate Speed of Light for Bonnor Beam
  • diracs-cat
  • · Replies 26 ·
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Undergrad Time dilation and the human body
  • Ricb
  • · Replies 11 ·
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Undergrad If electrons can be pointlike particles, why can't black holes?
  • Feynstein100
  • · Replies 16 ·
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High School Is time travel... travelling from one 3 dimensional space time to another 3 dimensional space time?
  • Judy
  • · Replies 14 ·
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Graduate Is Fatio–Le Sage's theory of gravitation an entropic gravity?
  • Jerome Wang
  • · Replies 33 ·
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High School Is time an illusion?
  • L Drago
  • · Replies 5 ·
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High School Can we measure absolute motion of Earth and Sun?
  • zasvitim
  • · Replies 57 ·
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Undergrad Definition of tangent vector to a timelike geodesic
  • TimWilliams87
  • · Replies 8 ·
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Undergrad Tensor field from a covariant derivative operator (affine connection)
  • cianfa72
  • · Replies 28 ·
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