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
Graduate Universe expansions effect on gravity and Einsteins theory of special relativity
- TerryHM
- · Replies 13 ·
Graduate Define Black Holes w/o Asymptotic Flatness?
- bcrowell
- · Replies 2 ·
Graduate Length contraction of distant objects/space, etc
- coktail
- · Replies 5 ·
Graduate Visualizing General Relativity with Fluid Analogy
- lukesfn
- · Replies 2 ·
Graduate How can a spaceship reach a distant galaxy faster than light does in the galaxy's frame?
- surfa808
- · Replies 1 ·
Graduate Understanding Past and Future Light Cones
- AbsoluteZer0
- · Replies 1 ·
Graduate What are Gaussian coordinates and where can I learn about them?
- icma
- · Replies 3 ·
Graduate How Does a Photon Experience Space and Time?
- QuantumHop
- · Replies 8 ·
Graduate Does a photon have rest mass, and does it have mass while moving?
- aleemudasir
- · Replies 35 ·
Graduate Black Hole Time Dilation: Light-ray Interpretation
- Alexrey
- · Replies 1 ·
Graduate Why is gravity the only force the causes time dilation?
- soothsayer
- · Replies 2 ·
Graduate Anti-de Sitter spacetime metric and its geodesics
- MManuel Abad
- · Replies 7 ·
High School Why does time change if speed changes in the twin paradox?
- radioactive8
- · Replies 1 ·
Graduate Can Information Be Preserved on Closed Timelike Curves?
- JPBenowitz
- · Replies 42 ·
Graduate Correct phrasing / use of vocabulary for SR
- Vandam
- · Replies 79 ·
Graduate Does Bell's Paradox Suggest String Shouldn't Break Due to Length Contraction?
- schaefera
- · Replies 206 ·
Graduate How Do Light Clocks Illustrate Time Dilation and Length Contraction?
- peterspencers
- · Replies 18 ·
Graduate Why does length contraction only occur parallel to the direction of motion?
- peterspencers
- · Replies 56 ·
Undergrad Speed of light constant in NON-vacuum?
- jmvizanko
- · Replies 20 ·
Graduate I have been reading a book on hyperspace and again the author has gone
- latter
- · Replies 17 ·
Graduate Why does Einstein's 1905 SR paper contain Zero citations?
- Lamarr
- · Replies 10 ·
Graduate How can both spaceships see the other's clock running slower?
- John Stanly
- · Replies 6 ·
Graduate Relative difference in laws of electrodynamics
- nouveau_riche
- · Replies 63 ·
Graduate How does spacetime curvature explain multiple orbits around the sun?
- Nogueira
- · Replies 4 ·
Undergrad Was Ruđer Bošković the first one?
- Lamarr
- · Replies 1 ·
Graduate Why didn't Einstein use Ωg_αβ - L_αβ = G_αβ instead of the cosmological constant?
- Messenger
- · Replies 2 ·
Graduate What's being curved, when mass bends the spacetime continuum?
- Rayzen
- · Replies 63 ·
Graduate Shrinking event horizon to point singularity
- grav-universe
- · Replies 26 ·
Graduate Does potential energy change mass
- roboticmehdi
- · Replies 12 ·
Graduate Questions about the accelerating universe
- serp777
- · Replies 7 ·
Undergrad Thought experiment about time dilation
- nonnonenon
- · Replies 24 ·
Graduate I have a spacecraft that can trave to Alpha Centauri in 1 week
- Eirhead
- · Replies 16 ·
Graduate Local flat space and the Riemann tensor
- nigelscott
- · Replies 4 ·
Undergrad What happens to the shape of an accelerating mass
- brupenney
- · Replies 10 ·
Graduate Eternal black hole Hawking process
- FunkyDwarf
- · Replies 5 ·
Graduate Repeat of Hafele-Keating Experiment?
- Lamarr
- · Replies 9 ·
Graduate Existence of gravitational energy
- exponent137
- · Replies 6 ·
Graduate Tensors and vector derivatives
- nigelscott
- · Replies 7 ·
Undergrad Einsteins Theory on Relativity
- ijwakeel
- · Replies 8 ·
Undergrad Hyperbolic Geometry in special relativity
- StationZero
- · Replies 10 ·
Graduate What is the FTL drive model that is not the Alcubierre?
- jerich1000
- · Replies 1 ·
Graduate Intuition for General/Special Relativity theorems without experiments
- solr
- · Replies 4 ·
Graduate Velocities as seen by different observers.
- Sefrez
- · Replies 1 ·
Undergrad Understanding Light Wave Propagation
- hubble_bubble
- · Replies 20 ·
Graduate Does time dilation effect rate of isotope decay?
- David Carroll
- · Replies 4 ·
Graduate Why does relativistic mass increase as velocity approaches c?
- ShayanJ
- · Replies 2 ·
Graduate Light Cone Distributions: Review by Eric Poisson, Ian Vega and Adam Pound
- PLuz
- · Replies 2 ·
Graduate Mass and energy when traveling at near the speed of light
- divya_basuti
- · Replies 1 ·
Graduate Can binding energies sum to the rest energy of a mass?
- jmatt
- · Replies 14 ·
Graduate Doppler effect and invariability of C
- PhysicsLaura
- · Replies 5 ·
Graduate Have we observed decreasing velocity or spiraling in binary pulsars?
- Rorkster2
- · Replies 3 ·
Graduate Passage from the book relativity i am not able to understand
- RohitRmB
- · Replies 12 ·
Undergrad Calculating the Distance Traveled by Light: Myth or Reality?
- hubble_bubble
- · Replies 8 ·
Undergrad Time Dilation with objects at low speeds
- Emc2fma
- · Replies 9 ·
Graduate Schwarzschild metric and spherical symmetry
- grav-universe
- · Replies 32 ·
Undergrad Why do light flashes from both ends of a train reach the passenger at the same time?
- PhysicsLaura
- · Replies 392 ·
Graduate Can light act like an object in motion and stand still in an ideal environment?
- Securityman
- · Replies 6 ·
Graduate Book for Special Relativity that uses Tensors
- keebz
- · Replies 5 ·
Graduate Outgoing Eddington-Finkelstein coordinates
- VantagePoint72
- · Replies 2 ·
Undergrad Do relativistic effects limit disk rotation speed?
- QuantumHop
- · Replies 3 ·
Graduate Mass Increase When Light Speed Increases: Einstein's Theory
- Phyzwizz
- · Replies 2 ·
Graduate Form of Lorentz Transformation Using West-Coast Metric
- LittleSailor
- · Replies 3 ·
Graduate Can special relativity be violated by an electron in a television tube?
- abbeynewton
- · Replies 4 ·
Graduate Is energy conservation necessary?
- atyy
- · Replies 14 ·
Graduate Unruh effect and lessons regarding reality
- tom.stoer
- · Replies 45 ·
Graduate Hypothetical implication of Lorentz contraction
- P Brane
- · Replies 3 ·
Graduate Why Does Frame Choice Matter in Velocity Addition Problems?
- VortexLattice
- · Replies 7 ·
Graduate Field transformation in Griffiths' parallel plate capacitor example
- VortexLattice
- · Replies 5 ·
Undergrad What happens if C is faster than the speed of light?
- Dibs101
- · Replies 33 ·
Graduate Is the Travel Time to Reach the Speed of Light Really Only 2 Years?
- schaefera
- · Replies 4 ·
Graduate Is cosmic muon lifetime extension a valid test of relativity?
- arindamsinha
- · Replies 9 ·
Graduate Are the directions of electric fields lines affected by Gravity?
- Edward Solomo
- · Replies 115 ·
Graduate Gravitational Wave Local Energy: Not Gauge Invariant?
- alemsalem
- · Replies 2 ·
Graduate Black Holes: Event Horizon, Singularity & Information Loss
- valentin mano
- · Replies 6 ·
Graduate Sign error in FLRW null geodesic equation from Narlikar paper
- andrewkirk
- · Replies 11 ·
Graduate Why do planets orbit faster near massive bodies in general relativity?
- Rorkster2
- · Replies 12 ·
Graduate Range of summation indices in the Christoffel symbol
- TheEtherWind
- · Replies 3 ·
Graduate Monkey and Hunter Problem - General Relativity?
- SpartanG345
- · Replies 1 ·
Graduate Proper Acceleration and Christoffel Symbols
- TheEtherWind
- · Replies 21 ·
Graduate Rohrlich's derivation of E=mc2 wrong?
- Lamarr
- · Replies 4 ·
Undergrad What is Lorentz transformation?
- pigman70
- · Replies 13 ·
Graduate Faster than light relative speeds (I know it's impossible)
- coktail
- · Replies 35 ·
Graduate Locally inertial coordinates on geodesics
- VantagePoint72
- · Replies 3 ·
Graduate Is Papapetrou line element the same as cylindrical coordinates?
- Saeide
- · Replies 2 ·
Graduate Justification of length contraction in light-clock presentation
- bcrowell
- · Replies 23 ·
Graduate SR and speed of light in matter
- ShayanJ
- · Replies 10 ·
Graduate Why does gravitational mass-current not form a 4-vector like electromagnetic current?
- atikof
- · Replies 13 ·
Undergrad Who Ages Faster in the Twin Paradox?
- Visceral
- · Replies 63 ·
Graduate Initial Acceleration of Photons
- RiddlerA
- · Replies 11 ·
Graduate Will we measure the velocity c?
- RobinSky
- · Replies 3 ·
Graduate What are the consequences of violating (or almost) speed c
- QuantumHop
- · Replies 10 ·
Graduate How Can a Magnetic Field Generate an Electric Field Without Experiencing Time?
- QuantumHop
- · Replies 3 ·
Undergrad Does Time Dilation Occur When Orbiting Around a Planet?
- cragar
- · Replies 21 ·
Graduate Problem with Understanding Dimensions
- RiddlerA
- · Replies 9 ·
Graduate Spin Density and Non-symmetric Stress-Energy Tensor
- stevendaryl
- · Replies 45 ·
Graduate Is length contraction direction independent?
- phyti
- · Replies 3 ·
Graduate Top Free Mathematica Packages for Calculating GR Tensors and Derivatives
- jarod765
- · Replies 3 ·
Undergrad Does Relativistic Speed Increase Gravity Pull?
- frujin
- · Replies 3 ·
Graduate Travelling close to the speed of light
- kbaumen
- · Replies 6 ·
Graduate Why does mutual time dilation seem to give t_a = γ²t_a?
- mathman44
- · Replies 3 ·