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
- Sticky
Graduate Relativity Insights: FAQs on Photons, Gravity, Time Dilation, and More!
- Greg Bernhardt
- · Replies 4 ·
Undergrad Transit time for a round trip to alpha centuri...
- oracle99
- · Replies 30 ·
High School Einstein equations don't work at large scale?
- gen x
- · Replies 54 ·
High School I don't understand the Michelson–Morley experiment
- gen x
- · Replies 45 ·
Undergrad Photons vs Gravitons
- TouchuvGrey
- · Replies 18 ·
Undergrad GR as Gauge Theory
- fresh_42
- · Replies 4 ·
Undergrad Question regarding information preservation in Hawing radiation models
- maram56
- · Replies 1 ·
Undergrad Comparing the time of two moving clocks
- Mike_bb
- · Replies 25 ·
High School Looking for an English translation of Levi-Civita's 1926 paper "Sur l'écart géodésique" ("On the geodesic deviation")
- JimWhoKnew
- · Replies 13 ·
Undergrad How does reciprocal time dilation work?
- Mike_bb
- · Replies 87 ·
Undergrad How to understand the basis transformation of the Rosen metric?
- Lotto
- · Replies 19 ·
High School Can anyone deeply understand relativity?
- BadgerBadger92
- · Replies 34 ·
Undergrad Reciprocal time dilation on the example with two moving trains
- Mike_bb
- · Replies 18 ·
Graduate Is photon frequency intrinsic or observer-dependent?
- Roberto Pavani
- · Replies 16 ·
Undergrad Why does coordinate dependence violate homogeneity in spacetime intervals?
- Mike_bb
- · Replies 23 ·
High School RocketGirl receives a radio message from Earth
- smaricic
- · Replies 24 ·
Undergrad Definition of distance in GTR
- wolfgang6444
- · Replies 4 ·
Graduate Square root of Kretschmann scalar in Schwarzschild metric
- Roberto Pavani
- · Replies 7 ·
Undergrad Why can coefficient "a" between spacetime intervals depend on velocity between systems?
- Mike_bb
- · Replies 42 ·
Graduate Why is there gauge freedom in ADM formalism?
- concerned citizen
- · Replies 3 ·
Undergrad Why is gravity a fictitious force?
- Mike_bb
- · Replies 153 ·
Graduate Applicability of Spin-2 Field Interpretation of GR
- Matterwave
- · Replies 5 ·
Undergrad Simplified Special Relativity: Looking to get roasted on this
- DavidMiranda
- · Replies 61 ·
High School Can Curved Spacetime Enable Faster-Than-Light Travel?
- Marcarious Thomas
- · Replies 13 ·
High School A simple Black Hole question I can't find an answer for
- davel18
- · Replies 39 ·
Undergrad Why is the Lorentz Force always perpendicular to velocity?
- JiuBeixin
- · Replies 56 ·
High School Relativity and the absurdities of Alice
- Nugatory
- · Replies 4 ·
Graduate Error in Landau-Lifshitz Vol 2, Fig. 20, page 310
- Kostik
- · Replies 9 ·
Graduate The Lagrangian of a free particle ##L=-m \, ds/dt##
- Kostik
- · Replies 5 ·
Graduate Singularity Theorems
- Matterwave
- · Replies 8 ·
High School The problem of energy appearing out of nowhere
- DanteKennedy
- · Replies 33 ·
Undergrad Special relativity and diffracting beams
- calacone
- · Replies 3 ·
Undergrad Why did the photon lose its license?
- drzbigniew31
- · Replies 8 ·
Undergrad Could the (SR) forbidden photon's own referential mean something?
- drzbigniew31
- · Replies 4 ·
High School Does a fast-moving object appear to move slowly due to time dilation?
- BadgerBadger92
- · Replies 9 ·
High School Do Dark Energy and the Casimir effect indicate Exotic Matter could exist?
- okabe rintarou
- · Replies 16 ·
Undergrad Does the Alcubierre drive shorten distances?
- Jaime Rudas
- · Replies 171 ·
High School Spacetime interval for ship moving at 0.99c relative to CMB
- Ignorantsmith12
- · Replies 12 ·
Graduate Is the variation of the metric ##\delta g_{\mu\nu}## a tensor?
- Kostik
- · Replies 68 ·
High School Tool for visualizing electric and magnetic field transformations under Lorentz boosts
- SiennaTheGr8
- · Replies 26 ·
Graduate How valid is the Block Universe theory?
- DarkloidNeos
- · Replies 71 ·
Undergrad Special Relativity in a closed universe
- kochanskij
- · Replies 9 ·
Undergrad Black hole questions
- EdwardRo
- · Replies 29 ·
Undergrad Relativistic Uniform Circular Motion
- renormalize
- · Replies 15 ·
Undergrad KE of rotating disc
- Ibix
- · Replies 87 ·
MIT GR problem set 3: electromagnetic field tensor and 4-velocity
- DavidL070949
- · Replies 18 ·
Graduate Aether equal to spacetime?
- quark69
- · Replies 5 ·
Undergrad Why doesn't time dilation prevent aging in the twin paradox?
- InquiringMind
- · Replies 42 ·
Graduate Struct parallels between curvature behavior/abstract geometric cycles?
- Thor Jackson
- · Replies 21 ·
Graduate Rotating Disk Method to Attain Light Speed?
- aLeaf
- · Replies 40 ·
Graduate Feynman's bug (hot plate) in generality
- gerald V
- · Replies 5 ·
High School Relativistic stress in a rapidly rotating disc and object cohesion
- red_ed
- · Replies 14 ·
Undergrad Differentiating connections along a worldline
- JimWhoKnew
- · Replies 14 ·
Graduate Gravitational wave propagation in GR - follow up
- cianfa72
- · Replies 37 ·
Undergrad Why is 0.9g more efficient than 1.5g to Tau Ceti in Project Hail Mary?
- rocky
- · Replies 36 ·
Graduate Topological constrains for the solutions of EFE
- cianfa72
- · Replies 31 ·
Undergrad With gravitational lensing, which way is down?
- .Scott
- · Replies 29 ·
Graduate What Exactly Is The Physical Content Of Maxwell's Equations?
- bhobba
- · Replies 21 ·
Undergrad Relativity, time, and quantum mechanics
- anuttarasammyak
- · Replies 47 ·
Undergrad Raising and lowering indices using metric tensor
- cianfa72
- · Replies 9 ·
Graduate About the definition of Born rigidity
- cianfa72
- · Replies 38 ·
Undergrad Euclidean geometry and gravity
- raagamuffin
- · Replies 169 ·
Graduate Spacetime interval in Galilean relativity
- LightPhoton
- · Replies 8 ·
Undergrad EPR revisited
- anuttarasammyak
- · Replies 38 ·
Graduate Orbits of a photon that can't quite cross the photon sphere of a BH
- pervect
- · Replies 1 ·
Undergrad Looking closely at the descent into a black hole
- .Scott
- · Replies 51 ·
Undergrad One way speed of light
- HansH
- · Replies 26 ·
Undergrad The paradox of symmetrical time dilation
- spacecadet2563
- · Replies 15 ·
Graduate Can a causal or time-like structure emerge without assuming a metric?
- DavidMartin
- · Replies 56 ·
Undergrad Why is ##(t_1'-t_2')^2## constant in proof(invariance of intervals)?
- Mike_bb
- · Replies 2 ·
Undergrad Ships passing each other at near light speed
- Skaperen
- · Replies 5 ·
Graduate Does a truly static "Block Universe" allign with "experience" aspect?
- OmniThoughts
- · Replies 2 ·
Graduate Regarding Relativity of Simultaneity, is non-local "now" impossible?
- OmniThoughts
- · Replies 2 ·
Undergrad How many sorts of time are there in physics?
- pervect
- · Replies 12 ·
Undergrad Einstein's time formula
- spacecadet2563
- · Replies 3 ·
Graduate Stability of the Kerr–Newman black hole under small perturbations
- zhumataidana22
- · Replies 2 ·
High School Do photons experience zero time between emission and absorption?
- spacecadet2563
- · Replies 10 ·
Undergrad Does time stop for objects traveling at light speed?
- spacecadet2563
- · Replies 23 ·
High School Time travel without paradox
- spacecadet2563
- · Replies 7 ·
Graduate Dirac's 1958 lecture on spinors
- grzz
- · Replies 4 ·
Graduate Deriving equation 3.64 from equation 3.59 in quantum field theory on curved spacetime
- mad mathematician
- · Replies 1 ·
Undergrad Gravitational analog of electromagnetic force
- synch
- · Replies 20 ·
Undergrad Macroscopic objects in free-fall
- cianfa72
- · Replies 32 ·
Undergrad Light clock treating horizontal and vertical motion differently?
- foxeamonn1969
- · Replies 38 ·
Undergrad Linear vs rotary motion
- Physicist248
- · Replies 28 ·
High School True static equilibrium and effects on time
- atnu8
- · Replies 25 ·
High School Car spinning on a frictionless sheet of ice = absolute motion?
- ESponge2000
- · Replies 15 ·
High School Relativistic simultaneity and effects on time
- pervect
- · Replies 9 ·
Undergrad Acceleration calculation in Special Relativity
- Bob Walance
- · Replies 5 ·
High School Deriving relativistic kinetic energy from relativistic momentum
- mcastillo356
- · Replies 6 ·
High School Why does a Wormhole not look like an hourglass?
- Aayush Thakur
- · Replies 12 ·
High School Traveling through space at zero km/s
- mike9731
- · Replies 11 ·
Graduate Kruskal Coordinates in Schwartzchild metric
- mad mathematician
- · Replies 9 ·
Undergrad Convention for writing $\binom{1}{1}$ tensors in matrix form?
- Kick-Stand
- · Replies 8 ·
Undergrad Derive the Lorentz transformation in Minkowski four-dimensional spacetime spacetime
- Xinze
- · Replies 8 ·
Undergrad Relational event horizons?
- scakpinar
- · Replies 11 ·
Graduate Stumped by a Lagrangian in Einstein's 1916 paper
- Isaek_
- · Replies 3 ·
High School Am I understanding the concept of proper frame of reference?
- mcastillo356
- · Replies 33 ·
High School Why is the constant speed of light so unique?
- PLAGUE
- · Replies 19 ·