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 Electric Field in Gravitational Shockwave Geometry?
- Physics Monkey
- · Replies 0 ·
Undergrad What is the smallest practical unit of time?
- DarioC
- · Replies 2 ·
Graduate What is the difference between locality and causality?
- "Don't panic!"
- · Replies 6 ·
Graduate What laws of physics are the same in all inertial frames of SR?
- Stephanus
- · Replies 12 ·
Graduate Can the torsion tensor be written in terms of the metric?
- Physicist97
- · Replies 1 ·
Graduate Age of Universe for High Velocity Planet?
- icantevenn
- · Replies 7 ·
Undergrad Can Space Aircraft Reach Speed of Light in Vacuum?
- firin81
- · Replies 5 ·
Graduate Bending space and space time - what is the difference?
- Premanand
- · Replies 9 ·
Graduate What is the cause of time dilation in Special Relativity?
- giulio_hep
- · Replies 33 ·
Graduate What info do I get from these tensors?
- space-time
- · Replies 7 ·
Undergrad What exactly is a hypersurface?
- Tony Stark
- · Replies 5 ·
Graduate Einstein-Cartan Field Equations Derivation
- Physicist97
- · Replies 2 ·
Undergrad What is the 4th Dimension - 3D World + Time or 4 Axis?
- nirky
- · Replies 5 ·
Undergrad Basis Vector in GR: Cartesian Plane Comparisons
- Tony Stark
- · Replies 2 ·
Graduate How to draw a Penrose diagram from a spacetime metric
- naima
- · Replies 18 ·
Graduate Is time a vector? if it is, what is its direction?
- Superleopard21
- · Replies 15 ·
Graduate Is Λa_b the Same as Λba in Tensor Notation?
- dyn
- · Replies 4 ·
Graduate Are Newton's Laws Still Valid Near Black Hole Orbits?
- DParlevliet
- · Replies 58 ·
Graduate Implications of the tensorial form of the EFE
- TrickyDicky
- · Replies 26 ·
Undergrad Scalar Product of Orthonormal Basis: Equal to 1?
- Tony Stark
- · Replies 6 ·
Graduate Can you detect your own motion by timing light in your frame?
- Sturk200
- · Replies 13 ·
High School How many times did the machine actually travel around the Earth?
- Nick666
- · Replies 23 ·
Graduate Is the amount of time finite if space is finite?
- Topleft
- · Replies 5 ·
Graduate What is the definition of Locality (in QFT)
- "Don't panic!"
- · Replies 16 ·
Graduate Time Dilation with a Tennis Ball
- Sturk200
- · Replies 14 ·
Graduate How Does Time Dilation Affect the Forces Between Fast-Moving Objects?
- godzenon
- · Replies 4 ·
Graduate Generalized velocity addition and aberration formulas
- PAllen
- · Replies 4 ·
Graduate Do simultaneous events have space-like separation in QFT?
- "Don't panic!"
- · Replies 19 ·
Graduate Equations of motion for an observer falling radially into a blackhole
- Buzz Bloom
- · Replies 8 ·
Graduate What is an orthonormal basis in general relativity?
- Tony Stark
- · Replies 2 ·
Graduate Doppler effect and time dilation seem to contradict for approaching light sources
- Amr Elsayed
- · Replies 15 ·
Graduate Can expansion-separated synchronized clocks measure one-way light speed?
- rede96
- · Replies 55 ·
Graduate Energy conservation and wormholes
- PWiz
- · Replies 25 ·
Graduate 2 simple special relativity thought experiments
- JustinM523
- · Replies 16 ·
Undergrad What if the Halo Ring from "Halo" turned into a blackhole?
- Justice Hunter
- · Replies 7 ·
Graduate How does the Hilbert action vary to give the energy-momentum tensor?
- shubham agn
- · Replies 2 ·
Graduate Quantized Kinetic Energy of Relativistic Objects
- jrvinayak
- · Replies 3 ·
Graduate Difference between Co-variant and Contra-variant vectors?
- sderamus
- · Replies 5 ·
Graduate Does relativistic mass affect gravitational attraction between moving vessels?
- a1call
- · Replies 1 ·
Graduate Distance traveled in sudden deceleration from c/2
- Raman Choudhary
- · Replies 13 ·
Undergrad Does time pass twice as slowly on a planet with twice Earth's mass?
- k!rl
- · Replies 1 ·
Graduate Using length contraction to measure spacecraft velocity
- litup
- · Replies 12 ·
Graduate Material Behavior at the Event Horizon
- MattRob
- · Replies 10 ·
Graduate The sign of the cosmological term
- sweet springs
- · Replies 8 ·
Graduate Can you determine if a geodesic is timelike without knowing the metric?
- shubham agn
- · Replies 15 ·
Graduate Fall into Space-Time's Minimum Point
- Noctisdark
- · Replies 5 ·
Undergrad Can the Rest Mass of an Object Change Over Time?
- ChrisVer
- · Replies 13 ·
Graduate Drawing worldlines for simultaneous events in relativity of simultaneity
- Noctisdark
- · Replies 13 ·
Undergrad Is freefall really stationary motion according to general relativity?
- inertiaforce
- · Replies 66 ·
Graduate Gravitational Velocity of Mass ##M## at Distance ##d## from Gravitating Body
- ChrisVer
- · Replies 16 ·
Graduate Clarifying Robertson-Walker Metric Math Objects
- space-time
- · Replies 1 ·
Graduate A question on length contraction
- rede96
- · Replies 9 ·
Graduate Electrodynamics in Robertson Walker spacetime
- vanhees71
- · Replies 18 ·
Graduate Writing Non-Coordinate Basis Continuity Eqs: $\nabla_a T^{ab}$
- pervect
- · Replies 3 ·
Graduate Measuring Speed of Light with One Clock
- lowemack
- · Replies 4 ·
Graduate Lower gravity and higher time dilation?
- SpiderET
- · Replies 17 ·
Graduate Relationship between gravitational time dilation and energy?
- jcap
- · Replies 7 ·
Graduate Alcubierre drive, could it cause inconsistencies?
- Gerinski
- · Replies 8 ·
Graduate Understanding Einstein's field equations
- ChromeBit
- · Replies 5 ·
Graduate Line element in Euclidean Space
- Tony Stark
- · Replies 8 ·
Graduate Do different frames of reference experience time dilation at the same rate?
- kweagle
- · Replies 49 ·
Graduate Spin connection identities in FLRW spacetime
- JorisL
- · Replies 2 ·
Graduate Calculating area and volume for Diagonal Metrics
- Tony Stark
- · Replies 9 ·
Graduate Can Bob distinguish wave speed from frequency without directly measuring propagation?
- DiracPool
- · Replies 1 ·
Graduate Why is the relative Lorentz factor Lorentz invariant?
- CassiopeiaA
- · Replies 4 ·
Graduate Dimension of the stress energy tensor
- PerpStudent
- · Replies 10 ·
Graduate What is the value addition of GR?
- controlfreak
- · Replies 37 ·
Graduate Photon Experiencing Infinity Over Time: A Relativity Question
- The Un-Observer
- · Replies 6 ·
Undergrad What does it mean to bend space in relativity?
- thinkandmull
- · Replies 4 ·
Graduate How does gravitational lensing affect observations of distant exoplanets?
- kos
- · Replies 1 ·
Graduate How Does Light Behave Inside a Black Hole?
- Giuliano97
- · Replies 7 ·
High School Why does time feel faster when sleeping than when awake?
- Teendreams
- · Replies 1 ·
Graduate Vary Metric w/ Respect to Veirbein: How To?
- Physicist97
- · Replies 5 ·
Graduate General metric and flat metric
- Tony Stark
- · Replies 5 ·
Graduate Black hole traveling near the speed of light
- serp777
- · Replies 31 ·
Graduate When current flows through 2 parallel wires (same amount of current)
- jeevesh
- · Replies 6 ·
Graduate Varying Minkowski Metric: Is {\delta}{\eta}_{\mu\nu}=0?
- Physicist97
- · Replies 2 ·
Graduate Does relativistic aberration account for length contraction?
- Kevin Willis
- · Replies 2 ·
Graduate How Can We Overcome the Challenges of Locating Gravitational Energy?
- sweet springs
- · Replies 66 ·
Graduate Time dilation, length contraction, but velocity invariant
- Kairos
- · Replies 35 ·
Graduate Geometry as the Classical Limit: Examples and Analogies in Physics
- ephen wilb
- · Replies 3 ·
Graduate Flat Spacetime at Event Horizon of Black Hole?
- btouellette
- · Replies 3 ·
Graduate What are some recommended resources for studying General Relativity?
- Salah93
- · Replies 1 ·
Undergrad Speed of Sound: Constant Irrespective of Source Speed
- PavanKumar
- · Replies 5 ·
Graduate Contracting Einstein's equations to get the Ricci scalar
- Physicist97
- · Replies 5 ·
Graduate Does gravity work by objects moving perpendicular to spacetime curvature?
- slibbfalusken
- · Replies 3 ·
Graduate Perceiving Time and Speed at Near Light Speed
- TimeRip496
- · Replies 12 ·
Graduate Can we determine motion within an enclosed object using energy and mass?
- ande4jo
- · Replies 54 ·
Undergrad Can Galaxies Rotate Faster Than the Speed of Light?
- AYPHY
- · Replies 2 ·
Graduate Could this experiment prove special relativity to be wrong?
- Steven2007
- · Replies 9 ·
Graduate How gravity works beyond the Event Horizon
- Gaz1982
- · Replies 56 ·
Graduate Hamiltonian Weak Gravitational Field - Learn Free Particle Theory
- Andre' Quanta
- · Replies 5 ·
Graduate Can tensors be decomposed into component vectors and combined across coordinate systems?
- clinden
- · Replies 10 ·
High School Why I thought my car was moving backward when it wasn't
- phinds
- · Replies 10 ·
Graduate Non causally linked events in special relativity
- Anaxagoras
- · Replies 21 ·
Graduate Diffeomorphism and removal of all matter from the spacetime
- exponent137
- · Replies 10 ·
Graduate Spacetime Curvature Difference: Gravity vs Speed
- Gerinski
- · Replies 2 ·
Graduate What Causes the Twins Paradox and Length Contraction in Relativity?
- Stephanus
- · Replies 79 ·
Graduate Why Is SO+(1,3) Decomposable and Connected?
- N1k1tA
- · Replies 3 ·
Graduate How Does Relativity Affect the Appearance of Large Objects?
- Brett Caton
- · Replies 1 ·