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 What are U, U' and V in the relativistic velocity addition equation?
- polishdude20
- · Replies 2 ·
Graduate Does Hawking radiation violate the second law of thermodynamics?
- jmcmahon
- · Replies 1 ·
Undergrad Angular momentum and the twin paradox
- DARKSYDE
- · Replies 3 ·
Graduate Finding Ricci Scalar Constant Nonzero Line Elements
- alejandrito29
- · Replies 4 ·
Graduate Understanding 4-Momentum: Basics, Interpretation, and Conservation
- Jerbearrrrrr
- · Replies 7 ·
Graduate Does time run fastest at the location of the Big Bang?
- lufbrajames
- · Replies 23 ·
Graduate Is there a hierarchy between spatial and time dimensions?
- nuke24
- · Replies 1 ·
Graduate Why is energy-momentum tensor Lorentz invariant?
- Bibipandi
- · Replies 9 ·
Graduate Could the Twin Paradox Really Have Four Solutions That Sum to Zero?
- billbray
- · Replies 6 ·
Graduate Local curvature of surface just outside Schwarzschild radius
- Jonathan Scott
- · Replies 15 ·
Graduate Relativity/Simultaneity - I understanding a few things?
- skycastlefish
- · Replies 5 ·
Undergrad Solving E=MC2: What Does C2 Imply?
- TR14L
- · Replies 9 ·
Graduate How to diagonalize a warped metric
- pbk137
- · Replies 3 ·
Graduate Newton-Cartan theory: does escape velocity and Schwarzschild solutions exist?
- JustinLevy
- · Replies 19 ·
Graduate Simultaneity of Events: Is It Possible?
- proculation
- · Replies 6 ·
Graduate Do gravitational waves show interference patterns like electromagnetic waves?
- jobyts
- · Replies 3 ·
Graduate Trouble with Lorentz transformations
- pc2-brazil
- · Replies 149 ·
Graduate The action of a particle point is [tex]\int ds = \int d\tau
- alejandrito29
- · Replies 2 ·
Graduate Proving Invariance of Spacetime Interval
- emob2p
- · Replies 20 ·
Graduate No Mass Objects: Can They Remain Stationary?
- cubud
- · Replies 5 ·
Graduate The parable of the two travelers
- stevmg
- · Replies 6 ·
Undergrad Why is gravitational mass the same as inertial mass?
- sten
- · Replies 20 ·
Graduate Alice, Bob and Charge falling into Black Hole
- Dmitry67
- · Replies 1 ·
Graduate Covariant formulation of Coulomb's Law
- Rootboy
- · Replies 1 ·
Graduate Resultant time dilation from both gravity and motion
- espen180
- · Replies 134 ·
Graduate Gravitational force and acceleration in General Relativity.
- yuiop
- · Replies 371 ·
Graduate Traveling anywhere in the galaxy in your life time
- mihaiv
- · Replies 3 ·
Graduate Is black hole existence relative to the reference system?
- mihaiv
- · Replies 8 ·
Graduate The terms length contraction and time dilation
- Fredrik
- · Replies 11 ·
Graduate Do gravity waves experience doppler effect?
- nottay
- · Replies 3 ·
High School Should school physics curricula include relativity and quantum mechanics?
- Yb4real
- · Replies 1 ·
Graduate How would relativity change if humans used echolocation instead of light?
- UndeniablyRex
- · Replies 2 ·
Graduate EM vector potential - covariant or contravariant?
- pellman
- · Replies 8 ·
Graduate Relative motion and time dilation
- TurtleMeister
- · Replies 27 ·
Graduate We can not get back to our original position?
- cstvlr
- · Replies 1 ·
Undergrad What is the relationship between latitude and the accuracy of an atomic clock?
- Dmitry67
- · Replies 12 ·
Graduate Newtonian limit of Gravitational Klein-Gordon Equation
- FunkyDwarf
- · Replies 3 ·
Graduate Spaceship trapped inside event horizon - serious flaw
- tom.stoer
- · Replies 5 ·
Graduate A question that probably has something to do with simultaneity
- zanadu
- · Replies 11 ·
Graduate Do Falling Observers Experience Blueshift Inside a Black Hole?
- timetravel_0
- · Replies 12 ·
Graduate Gravitational Length Contraction and Dilation?
- D.S.Beyer
- · Replies 11 ·
Graduate Penrose diagrammatic tensor notation tutorial from basics
- LukeD
- · Replies 1 ·
Undergrad Why does Lorentz contraction occur?
- Taturana
- · Replies 2 ·
Graduate Why Is the Rest Energy of a Hydrogen Atom Less Than the Sum of Its Constituents?
- cepheid
- · Replies 4 ·
Graduate When Will Two Test Particles Cross Paths in the Schwarzschild Solution?
- Passionflower
- · Replies 15 ·
Graduate Does gravity vary with velocity?
- Zman
- · Replies 4 ·
Graduate Invariance of spacetime interval
- motoroller
- · Replies 10 ·
Undergrad Why are gravitational waves so rare?
- Awsom Guy
- · Replies 8 ·
Graduate Is the tensor product T^ab T_ab non-negative?
- JustinLevy
- · Replies 2 ·
Graduate What happens to a laser pulse that is beamed through a gravity well?
- TCS
- · Replies 12 ·
Graduate Lagrangian equation in special relativity
- IPhO' 2008
- · Replies 2 ·
Graduate What Is Gravity and How Does It Relate to Space-Time and Mass?
- timetravel_0
- · Replies 16 ·
Graduate Do Falling Particles in Schwarzschild Solution Radiate?
- Passionflower
- · Replies 3 ·
Undergrad Do frequent airplane travelers live longer due to time dilation?
- Suzukigold
- · Replies 16 ·
Graduate Is there a true singularity in nature?
- the softrat
- · Replies 1 ·
Graduate Can one determine that an instrument is an accelerometer locally?
- atyy
- · Replies 5 ·
Graduate Density in the friedmann equation
- RedX
- · Replies 7 ·
Graduate Obtaining the Metric in a Boosted Observer Frame?
- Mentz114
- · Replies 1 ·
Undergrad Possible to adjust light with magnetic field?
- Amalan
- · Replies 5 ·
Graduate Derivation of classical limit in c = 1 units (i.e. without cheating)
- Count Iblis
- · Replies 2 ·
Undergrad Self-rotating body with speed of light
- rsuryatheja
- · Replies 3 ·
Graduate Gravitational Wave Detection: Understanding Interferometers
- jeebs
- · Replies 2 ·
Graduate Why does B occur before C in the S' frame on this Minkowski diagram?
- I dun get it
- · Replies 3 ·
Graduate Why does rectilinear motion become curvilinear in an accelerated reference frame?
- SpaceExplorer
- · Replies 5 ·
Graduate Describing 4-vectors in space-time
- jfy4
- · Replies 1 ·
Graduate Mass Increase When Moving at Speed of Light?
- Visigoth
- · Replies 11 ·
Graduate 'Direction' of space-time curvature ?
- mjones32
- · Replies 9 ·
Graduate How Does Changing Velocity Affect Inertial Frame Transformations?
- Fredrik
- · Replies 12 ·
Graduate Length contraction and the direction of motion
- Darkmisc
- · Replies 7 ·
Graduate Opposite beams of photons or electrons
- motoroller
- · Replies 4 ·
Graduate A non-inertial frame is non-inertial with respect to what?
- marcosschiavi
- · Replies 7 ·
Graduate What Happens to Rest Mass Objects from a Photon’s Perspective?
- ZirkMan
- · Replies 10 ·
Undergrad Travel time for a space ship at relativistic speeds
- lordl
- · Replies 7 ·
Undergrad Is Velocity Constant in the Instantaneous Rest Frame?
- luxiaolei
- · Replies 3 ·
Graduate Special relativity: local frames versus global frame in a loop scenario
- Cleonis
- · Replies 3 ·
Graduate Should a stationary charge on the earth radiate?
- abhi2005singh
- · Replies 12 ·
Graduate Can Black Holes Actually Die Out?
- skepticdude
- · Replies 1 ·
Graduate Question re: time dilation equations
- mathyou9
- · Replies 2 ·
Graduate Information Transfer and the speed of light
- Bevels
- · Replies 2 ·
Graduate Spacelike and Timelike singuralites
- off-diagonal
- · Replies 2 ·
Undergrad Einstein relativity- radiowaves when travelling at v>0.1c
- grade12
- · Replies 4 ·
Graduate Difference between t^a and g^ab∇_bt in Wald's GR book
- paweld
- · Replies 1 ·
Undergrad Faster than speed of light spaceship.
- mooneyg3
- · Replies 6 ·
Graduate Work and rest mass in surface gravity derivation for Schwarzschild black holes
- nrqed
- · Replies 2 ·
Graduate Faster than light / compress space
- Fed
- · Replies 9 ·
Graduate Weyl Tensor Components in n-Dim Manifold: N=3?
- paweld
- · Replies 5 ·
Graduate Gravitational time dilation, redshift and doppler
- Zman
- · Replies 3 ·
Graduate Twin Paradox (by acceleration)
- Jonnyb42
- · Replies 51 ·
Graduate Independent components of the Riemann tensor in (3,1) form
- AdeBlackRune
- · Replies 5 ·
Graduate Derivation of Proper Time and Proper Space
- AdVen
- · Replies 17 ·
Undergrad Why can't we see the light before we turn on the bulb?
- Jonnyb42
- · Replies 1 ·
Graduate Topography of spacetime over time.
- D.S.Beyer
- · Replies 1 ·
Undergrad Can Two Spaceships Perceive Faster-Than-Light Speeds Relative to Each Other?
- fubarite
- · Replies 12 ·
Undergrad What is Albert Einstein's Theory of Spacetime?
- filegraphy
- · Replies 2 ·
High School What does E=mc^2 mean? How can it be used in an example?
- filegraphy
- · Replies 2 ·
Undergrad Is acceleration relative? (In the same way that velocity is)
- Georgepowell
- · Replies 32 ·
Graduate Does an object's mass truly increase with velocity due to kinetic energy?
- Fuz
- · Replies 8 ·
Graduate Light speed thought experiment
- rmshepherd
- · Replies 10 ·
Graduate Does compressing a mass to a smaller sphere change the curvature of space?
- TCS
- · Replies 11 ·
Graduate How Does Relativity Explain Light Behavior When Fired from a Moving Spacecraft?
- Grimm1111
- · Replies 8 ·