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.
Threads
Undergrad Missing proof of the Shell theorem in General Relativity
- Bosko
- · Replies 34 ·
Graduate TOV limit: continuous forces versus discrete particle triggering
- euquila
- · Replies 10 ·
Undergrad Effect of Radiation Pressure on a Moving Object
- wnvl2
- · Replies 31 ·
Graduate Does the EP imply that a free-falling observer follows a geodesic?
- Kostik
- · Replies 3 ·
Undergrad Temporal length vs. Temporal displacement
- LeeE
- · Replies 10 ·
Graduate Covariant form of Maxwell's (inhomogeneous) equations (in GR)
- Kostik
- · Replies 9 ·
Graduate "TImescape" models
- pervect
- · Replies 5 ·
High School Mass of a gyroscope when rotating or not rotating
- HansH
- · Replies 13 ·
High School A photon always travels in a black hole
- Koning_D
- · Replies 9 ·
Undergrad Going Up-Down Elevator G-forces vs Bouncing off a Spring G-force
- ESponge2000
- · Replies 5 ·
High School Michelson Morley experiment and the Doppler effect
- Luyo_66
- · Replies 21 ·
Undergrad A thought about visualizing space-time
- InquiringMind
- · Replies 24 ·
High School Does time dilation slow biological aging in strong gravitational fields?
- faz19_
- · Replies 14 ·
Graduate Minimal property of Spacelike geodesics in GR/curved spacetime?
- Kostik
- · Replies 76 ·
High School An issue about the twin paradox
- dwspacetime
- · Replies 24 ·
High School Can mass/energy simply be distorted spacetime?
- physicsisdope
- · Replies 9 ·
Undergrad Principle of relativity in the proof of invariance of interval
- Mike_bb
- · Replies 53 ·
Undergrad Why are we looking for a graviton?
- revnice
- · Replies 16 ·
Undergrad Epstein diagrams and a traveling ship
- Myslius
- · Replies 17 ·
Graduate Ricci tensor for Fermi normal coordinates
- TimWilliams87
- · Replies 1 ·
High School Is time travel physically possible?
- jedishrfu
- · Replies 13 ·
Undergrad Can spacetime curvature between objects cause repulsion as well as attraction?
- Amazium
- · Replies 32 ·
Graduate "Looks" of gravitational wave emissions for an eclipsing ternary compact object?
- snorkack
- · Replies 1 ·
Graduate Is parallel transport exactly norm-preserving or only approximately?
- Kostik
- · Replies 21 ·
High School No object actually approaches the speed of light
- Atlan0001
- · Replies 9 ·
Undergrad What does g00 element of the Schwarzschild metric tensor tell us?
- ongoer
- · Replies 28 ·
High School Can anything work (including human brains) inside a black hole?
- Manan
- · Replies 22 ·
Undergrad Integral subbundle of 6 KVFs gives a spacetime foliation by 3d hypersurfaces
- cianfa72
- · Replies 22 ·
Undergrad A textbook passage describing coordinate lines in physical space
- gnnmartin
- · Replies 4 ·
High School When I jump up and down what is the Einsteinian way to describe it?
- ESponge2000
- · Replies 39 ·
Undergrad Twin Paradox Resolution
- CSnowden
- · Replies 4 ·
Undergrad Notion of parallel worldlines in curved geometry
- cianfa72
- · Replies 5 ·
High School Do inertial frames agree on acceleration without gravity present?
- ESponge2000
- · Replies 13 ·
Graduate Landau-Lifshitz pseudotensor - expressing the EM tensor ##T^{ik}##
- Kostik
- · Replies 6 ·
High School Space travel and time dilation
- Stas1234
- · Replies 15 ·
Undergrad Where is the mass in a black hole?
- snorkack
- · Replies 8 ·
Undergrad Can light be reflected by a mirror inside a black hole's event horizon?
- happyparticle
- · Replies 22 ·
Undergrad Reconciling smooth spacetime with variable, rotating, earth gravity
- John Helly
- · Replies 4 ·
High School Is Gravity an illusion of a force but really a curvature of spacetime?
- ESponge2000
- · Replies 26 ·
High School Meaningfulness of the speed of light
- ginevradabenci
- · Replies 25 ·
Undergrad Measuring the Spacetime Interval with a Ruler
- Trysse
- · Replies 21 ·
Undergrad Does the metric in general relativity depend only on position because of the equivalence principle?
- ahmadphy
- · Replies 16 ·
High School One-Way Speed of Light
- shawnhcorey
- · Replies 93 ·
High School Light travel time through moving diamond at relativistic speeds
- ESponge2000
- · Replies 15 ·
Undergrad CTC on FLRW cosmological models
- cianfa72
- · Replies 6 ·
Undergrad About the meaning of "expanding universe"
- cianfa72
- · Replies 16 ·
Graduate Vanishing of an integral of a divergence over a closed surface
- Kostik
- · Replies 1 ·
Undergrad Spacetime topology of the Universe
- cianfa72
- · Replies 9 ·
Undergrad Clock rate in hyperbolic space-time manifold
- wreveley
- · Replies 1 ·
Undergrad E=mc^2 and acceleration
- cianfa72
- · Replies 26 ·
Undergrad [SR] light shot at an angle in a moving train
- roomie10
- · Replies 5 ·
Graduate Velocity Verlet for relativistic simulation
- Philip Koeck
- · Replies 2 ·
Undergrad Relativistic Doppler effect and refraction
- ahmadphy
- · Replies 10 ·
Undergrad Time dilation in regions of different gravitational strength
- EntropicThinker
- · Replies 20 ·
Undergrad Black hole and coordinate time from the perspective of Alice outside
- Bellaella
- · Replies 26 ·
High School Do all events in my past lightcone have fewer past events in theirs?
- ESponge2000
- · Replies 14 ·
Graduate Dirac on localization of energy in the gravitational field
- Kostik
- · Replies 16 ·
Undergrad Field equation interpretation
- Yoel
- · Replies 9 ·
Undergrad Black hole formation and infinite redshift
- LightPhoton
- · Replies 8 ·
Undergrad Two-way light speed invariance
- cianfa72
- · Replies 17 ·
High School Can you travel back in time to meet yourself under the self consistency principle?
- BadgerBadger92
- · Replies 3 ·
High School Prove the velocity of a moving object is absolute in one IRF?
- ESponge2000
- · Replies 22 ·
Undergrad Are equations for spacetime intervals correct?
- Mike_bb
- · Replies 6 ·
Undergrad Is there a maximum relativistic acceleration?
- Arend
- · Replies 29 ·
High School Drawing a Minkowski diagram to show multiple Points of View
- DaveC426913
- · Replies 7 ·
Undergrad Why is Rømer's light speed measurement not one-way?
- Warp
- · Replies 42 ·
High School Does Spacetime Have Physical Existence?
- Uncle Thi
- · Replies 58 ·
Graduate Value of quintessence while studying black hole thermodynamics
- djymndl07
- · Replies 1 ·
Undergrad Relativity of Simultaneity question (use Einstein synchronization)
- ESponge2000
- · Replies 5 ·
Undergrad How to correctly mark event B on the picture?
- Mike_bb
- · Replies 6 ·
Undergrad Non-Inertial Relativistic Dynamics
- Halc
- · Replies 18 ·
Graduate The wave vector ##k_\mu## in curved spacetime
- Kostik
- · Replies 4 ·
Undergrad Chain of lights falling into a black hole
- timmdeeg
- · Replies 19 ·
Graduate Spacetime model of evaporating black hole
- Dale
- · Replies 51 ·
Undergrad An alternative derivation of the equation of motion in General Relativity
- Bishal Banjara
- · Replies 0 ·
Undergrad Alive in one frame and dead relative to other?
- ahmadphy
- · Replies 50 ·
Undergrad You can't actually enter a blackhole?
- blackholesarecool
- · Replies 40 ·
Graduate Dirac's derivation of the action/Lagrangian for a free particle
- Kostik
- · Replies 3 ·
Undergrad Relating orthogonal accelerations in special relativity
- LightPhoton
- · Replies 1 ·
High School Simplest symmetrical time dilation question
- GR86
- · Replies 16 ·
High School Light clock geometry at speeds approaching c
- ESponge2000
- · Replies 5 ·
Undergrad Angles between 4-vectors in special relativity?
- LightPhoton
- · Replies 5 ·
Undergrad Confusion about Cauchy surfaces
- Dale
- · Replies 8 ·
High School Is SpaceTime just DistanceTime?
- FRANKENSTEIN54
- · Replies 11 ·
Undergrad Lecture on Newtonian spacetime
- Dale
- · Replies 27 ·
High School The ONE Ring has been Found
- jedishrfu
- · Replies 2 ·
High School Theories about light and time near a black hole
- GR86
- · Replies 20 ·
High School Lowering a rope through the event horizon
- GR86
- · Replies 12 ·
Undergrad Path independence redshift photon
- wnvl2
- · Replies 19 ·
Undergrad Charged particles and electromagnetic waves in transparent media
- member 743765
- · Replies 22 ·
Undergrad Lasting effects of Mass and Distance Dilation
- Jkreider48
- · Replies 45 ·
Undergrad The Faraday disk in the context of the theory of relativity
- Ivan Nikiforov
- · Replies 84 ·
Undergrad 2 objects of enormous volume each in relative motion very close to c
- ESponge2000
- · Replies 8 ·
Undergrad When Does a Train Passenger Experience Complete Darkness in a Tunnel?
- ESponge2000
- · Replies 40 ·
Undergrad Matrix form of metric component transformation?
- farfromdaijoubu
- · Replies 1 ·
Undergrad Energy and reference frames
- Ivan Nikiforov
- · Replies 87 ·
High School Can we say that everything on the planet is made up of energy or matter?
- EVANDRUH
- · Replies 5 ·
Graduate A better way of talking about time?
- Yuras
- · Replies 96 ·
Undergrad Are Space and Time Just an Illusion in General Relativity?
- brotherbobby
- · Replies 6 ·
Graduate Curvature with different connections on the two-sphere
- pervect
- · Replies 15 ·