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 A problem in the equations for Einstein's Special Theory of Relativity
- robertwinn
- · Replies 8 ·
Undergrad What is the fabric of space-time made up of?
- Shourya Tripathi
- · Replies 11 ·
Undergrad Does the speed of light pop out of other theories than EM?
- greypilgrim
- · Replies 16 ·
Undergrad Why are rotated parallel axes still parallel?
- unified
- · Replies 5 ·
High School Prove that metric tensor is covariant constant
- lerus
- · Replies 11 ·
Undergrad How relative is the magnetic field of a current carrying conductor?
- lonely penguin
- · Replies 4 ·
Undergrad The answer for the total mass of the Universe?
- WeirdUniverse
- · Replies 36 ·
Graduate Movement vs expansion in space
- exander
- · Replies 49 ·
Undergrad Does potential energy curve spacetime?
- Leureka
- · Replies 28 ·
Undergrad Relativity of Simultaneity and Length Contraction
- curiousburke
- · Replies 54 ·
Graduate Why ##A_{\nu:\sigma}=0## in flat space?
- Kostik
- · Replies 19 ·
Undergrad Mathematical problem with Schwarzschild spacetime?
- Bosko
- · Replies 26 ·
High School Gravitational potential energy, a thought experiment
- Lok
- · Replies 125 ·
High School Ship traveling near light speed arriving ahead of its own light
- Somoth Ergai
- · Replies 98 ·
Undergrad Dirac comment on covariant derivatives
- Kostik
- · Replies 7 ·
Undergrad Deriving the relativistic rocket equation with exhaust efficiency
- halcyon_zomboid
- · Replies 1 ·
Undergrad Lorentz Transformations Confusion
- laser
- · Replies 14 ·
High School Does the age of the Universe differ for observers in expanding space?
- mister i
- · Replies 19 ·
Undergrad Newton Galilean spacetime as fiber bundle
- cianfa72
- · Replies 29 ·
Graduate Coupling torsion to electromagnetism and torsion tensor decomposition
- nicopa
- · Replies 5 ·
Undergrad Galaxy recession and Universe expansion
- cianfa72
- · Replies 90 ·
Undergrad Is momentum conserved as a body falls through a gravitational field?
- Herbascious J
- · Replies 35 ·
Undergrad Does Kerr's argument against singularities apply to all black holes?
- Suekdccia
- · Replies 12 ·
Undergrad Doppler and Searchlight (Headlight)
- Albertgauss
- · Replies 21 ·
Undergrad Difference between the Shapiro Delay and time dilation?
- dsaun777
- · Replies 1 ·
Undergrad Is the electromagnetic 4-vector indeed a 4-vector?
- mbond
- · Replies 33 ·
Undergrad Is Relativistic Action for a beam of light = zero?
- LarryS
- · Replies 5 ·
Undergrad Spacetime expansion - time dimension expansion
- exander
- · Replies 48 ·
Undergrad Perceive Length Contraction VS Terrell Penrose
- Albertgauss
- · Replies 14 ·
Undergrad Light clock running faster than light?
- tagehedin
- · Replies 4 ·
Undergrad Time dilation vs Differential aging vs Redshift
- cianfa72
- · Replies 21 ·
High School Why Does Black Hole Entropy and Information Loss Matter?
- Omega0
- · Replies 7 ·
Undergrad Why does length contraction only occur along the direction of motion?
- Chenkel
- · Replies 45 ·
Undergrad Teaching Minkowski diagrams effectively
- pervect
- · Replies 15 ·
Graduate Can We Construct a Coordinate Chart Where Bell Observers Are At Rest?
- PeterDonis
- · Replies 11 ·
High School Could you use LIGO-technology to measure gravitational redshift?
- Isambard
- · Replies 11 ·
Undergrad Why "time part" represents energy in Four-momentum?
- PLAGUE
- · Replies 6 ·
Undergrad How do you resolve seeming contradictions in SR?
- curiousburke
- · Replies 76 ·
High School Time dilation between moving observers in special relativity
- joshuadeepak
- · Replies 10 ·
Undergrad Proof of Invariance of Spacetime Interval
- PLAGUE
- · Replies 6 ·
High School What do people mean when they say “space is flat?”
- BadgerBadger92
- · Replies 8 ·
Undergrad Potential energy and the gravitational field of a collapsing cloud of gas
- Herbascious J
- · Replies 1 ·
Undergrad Curved spacetime bulging in time direction
- pahenning
- · Replies 30 ·
High School Gravitational Time Dilation Inside the Sun
- Mikael17
- · Replies 9 ·
High School General Relativity and Universal Gravitational Constant
- ktmsud
- · Replies 27 ·
High School Can odometer analogy detect which starship is moving?
- FIL
- · Replies 34 ·
Undergrad Why doesn't length contraction affect the charge count in moving vs stationary rods?
- abdossamad2003
- · Replies 3 ·
High School How to add an object's multiple relativistic speeds from x, y, and z?
- syfry
- · Replies 37 ·
Undergrad Can you distinguish gravity from acceleration if the accelerating mass affects gravity?
- Kuruwee
- · Replies 29 ·
Undergrad Why doesn't relativity of simultaneity lead to a contradiction?
- m082844
- · Replies 17 ·
Undergrad How Does Distance to Proxima Centauri Affect Simultaneous Events?
- Ben S
- · Replies 2 ·
Undergrad Energy conservation in general relativity
- KleinMoretti
- · Replies 12 ·
Graduate Tom Roberts updated the SR experiments FAQ section
- jtbell
- · Replies 3 ·
Undergrad Speed of light after exiting a transparent medium
- isotherm
- · Replies 17 ·
Undergrad Is the Lorentz transformation the unique way to preserve light speed invariance?
- msumm21
- · Replies 20 ·
Undergrad Explaining time dilation and length contraction to skeptics
- pellis
- · Replies 61 ·
High School What is m in Kinetic Energy? Relativistic mass or Rest mass?
- Slimy0233
- · Replies 55 ·
Undergrad Seeing history when crossing event horizon
- Hill
- · Replies 41 ·
High School Can we see 2 black holes orbiting each other?
- HansH
- · Replies 57 ·
High School Does Space Recover or Oscillate After Being Distorted by Massive Objects?
- pforeman
- · Replies 3 ·
High School Black hole electromagnetic spectrum
- snorkack
- · Replies 4 ·
Undergrad Are the Lorentz Transformations False?
- Leepappas
- · Replies 54 ·
Undergrad Can someone falsify this analogy contradicting time dilation?
- misterously
- · Replies 25 ·
High School Does gravitational force act on system or its components?
- jovi2k
- · Replies 5 ·
High School Where does the light energy lost due to expansion go?
- mister i
- · Replies 13 ·
Undergrad What causes time dilation and length contraction
- hababsbshshhs
- · Replies 10 ·
High School A thought experiment regarding special relativity
- KyriakosTsp
- · Replies 15 ·
Undergrad Is the Idea of a Continuum Always an Approximation to the Physical?
- walkeraj
- · Replies 5 ·
Undergrad Incomplete geodesics in a singularity, do they warrant quantum concerns?
- walkeraj
- · Replies 3 ·
High School Would We See the Same Light After Traveling Back to Earth Faster Than Light?
- markterry
- · Replies 2 ·
Undergrad Physical meaning of zero time metric
- madsmh
- · Replies 10 ·
Graduate Do Black Holes have Singularities?
- fresh_42
- · Replies 20 ·
Undergrad Tidal effects on event horizon of binary rotating BHs
- Christian Thom
- · Replies 6 ·
Undergrad EFE with cosmological constant
- grav-universe
- · Replies 7 ·
Undergrad Why does time dilation appear reversed in the full Lorentz transformation?
- Chenkel
- · Replies 101 ·
High School Black hole evaporation mechanism
- Gingerot
- · Replies 4 ·
Undergrad How Can You Approach Steve Without Being Doppler-Shifted?
- jcsd
- · Replies 4 ·
High School Spacetime interval question involving a Pendulum in a Space Ship
- Chenkel
- · Replies 7 ·
Undergrad What was the role of frequency in the Michelson-Morley experiment's null result?
- MrYes
- · Replies 3 ·
Graduate Is there a basic example that works based on gravitoelectromagnetism?
- sergioperezf
- · Replies 9 ·
High School Is the Accelerating Expansion of the Universe Wasting Energy?
- mister i
- · Replies 4 ·
Undergrad Does Light Travel the Shortest Path in Curved Space-Time Around a Neutron Star?
- Bosko
- · Replies 82 ·
High School What Are the Relativistic Implications for Beacon Synchronization?
- dom_quixote
- · Replies 25 ·
Undergrad Isn't the speed of light tautologically 299792458 m/s?
- Kekkuli
- · Replies 34 ·
High School Time dilation geometry in Morin's treatment of moving clocks
- Chenkel
- · Replies 73 ·
Undergrad The speed of one photon through a transparent medium
- isotherm
- · Replies 74 ·
Graduate Correspondence between areal radius differences and proper distances
- PAllen
- · Replies 4 ·
Undergrad What is Earth's escape velocity?
- binis
- · Replies 8 ·
Graduate How to Express the Schwarzschild Metric in Fermi Normal Coordinates?
- Gleeson
- · Replies 13 ·
Undergrad Time dilation for a light pulse from Mars observed by a spaceship at 0.985c
- dirac26
- · Replies 14 ·
High School How do you project a Killing Vector onto a Schwarzschild field?
- bobrubino
- · Replies 6 ·
Undergrad Object accelerating away then stopping near a black hole event horizon
- Ivo Draschkow
- · Replies 35 ·
Undergrad How Does Special Relativity Affect Perceived Distances Between Planets?
- dwspacetime
- · Replies 101 ·
Undergrad Invariant definition of acceleration in Newtonian physics vs proper acceleration in GR
- cianfa72
- · Replies 30 ·
Undergrad Interpretation of (X,T) coordinates in Kruskal diagram
- Hill
- · Replies 34 ·
High School Is imaginary time a fourth dimension?
- bobrubino
- · Replies 13 ·
High School Minkowski Spacetime vs Euclidean Spacetime
- bobrubino
- · Replies 11 ·
High School Stationary charge next to a current-carrying wire
- lightlightsup
- · Replies 68 ·
Undergrad What happens if you place a mirror behind an event horizon?
- Bosko
- · Replies 18 ·
High School What does the Minkowski spacetime interval represent and how is it determined?
- PhanthomJay
- · Replies 20 ·