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 Is mass conserved in relativistic collision?
- Zarif
- · Replies 30 ·
Graduate Pontryagin densities and Chern-Simons form
- shereen1
- · Replies 3 ·
Undergrad Why was time dilation under GR a new concept?
- FallenApple
- · Replies 11 ·
Undergrad Special relativity and inertial frames
- redtree
- · Replies 17 ·
High School Special relativity and sequence of events
- Glenn G
- · Replies 16 ·
High School Earth time dilation vs Sun time dilation
- orion1977
- · Replies 3 ·
High School Flat Universe: What Does It Mean to be 3-Dimensional?
- ChrisisC
- · Replies 1 ·
High School Information traveling faster than light
- MiLara
- · Replies 6 ·
Undergrad A good reference sheet/manual about Einstein index notation?
- Gan_HOPE326
- · Replies 4 ·
Undergrad Mass in Special Relativity: Misconception or Reality?
- HungryBunny
- · Replies 5 ·
Insights The Schwarzschild Geometry: Part 2 - Comments
- PeterDonis
- · Replies 2 ·
High School Could gravity be used to send light speed signals?
- farolero
- · Replies 30 ·
Undergrad Why is a 4D Euclidean space needed to derive the FLRW metric?
- kent davidge
- · Replies 11 ·
High School Can we take a shrinking frame of reference?
- farolero
- · Replies 21 ·
Graduate Non static and isotropic solution for Einstein Field Eq
- Leonardo Machado
- · Replies 11 ·
Undergrad Mercury Precession and the Hypothetical Oblate Sun Model
- universityteacher
- · Replies 12 ·
High School Solving Ambiguity in QFT in Curved Spacetime
- fxdung
- · Replies 6 ·
High School Is a Rocket at Light Speed Truly Infinite Mass?
- farolero
- · Replies 3 ·
Undergrad Coordinate vs. Non-Coordinate Basis in General Relativity
- kent davidge
- · Replies 14 ·
High School How can objects fall past event horizons if infinite time passes for outside observers?
- BenAS
- · Replies 21 ·
Undergrad Unifying gravity and quantum mechanics
- kent davidge
- · Replies 15 ·
Undergrad Is the Contraction of a Mixed Tensor Always Symmetric?
- arpon
- · Replies 4 ·
High School Speed of Light at near C speeds
- Lavar
- · Replies 14 ·
High School Invariant rest mass conservation in particle creation and annihilation
- Albertgauss
- · Replies 18 ·
Undergrad Why Lorentz transformation breaks down for objects at light speed
- albertrichardf
- · Replies 6 ·
Graduate Relativity in Complex Analysis: Is There a Formulation?
- vinven7
- · Replies 2 ·
High School Why didn't Einstein solve the Schwarzschild metric first?
- vinven7
- · Replies 1 ·
Undergrad Velocity 4-Vector for Light Ray
- MikeLizzi
- · Replies 1 ·
Undergrad Understand Shape of Universe: Spatially Flat?
- kent davidge
- · Replies 4 ·
Undergrad How do white holes curve spacetime?
- DaniV
- · Replies 3 ·
High School General relativity vs. Newtonian gravity
- calinvass
- · Replies 11 ·
High School Does Graphene Have Infinite Mass?
- Noduagga
- · Replies 1 ·
Undergrad Something I noticed about Doppler asymmetry
- JohnnyGui
- · Replies 18 ·
Undergrad Sign error in Maxwell's equations with electromagnetic tensor
- Incand
- · Replies 7 ·
High School Black Holes: Questions on Event Horizon Observer
- kent davidge
- · Replies 5 ·
High School After crossing the event horizon, is the singularity approaching you at rest?
- tionis
- · Replies 5 ·
Graduate Which general relativity textbook for a first-year physics student?
- kent davidge
- · Replies 2 ·
Undergrad Why can't fluid mechanics be quantized if gravity can be?
- Narasoma
- · Replies 3 ·
Graduate Nonvanishing Torsion: When Does It Occur?
- EnigmaticField
- · Replies 4 ·
High School Do electrons orbiting at light speed explain time dilation?
- farolero
- · Replies 9 ·
High School Can space shrink around mass instead of spacetime curving?
- farolero
- · Replies 18 ·
High School Lorentz transformation formulas for arbitrary distances
- Jeronimus
- · Replies 18 ·
Undergrad What is the mass of a black hole made of?
- kent davidge
- · Replies 44 ·
Undergrad General Relativity: Is There No Universal Frame or No Way to Tell?
- Afterthought
- · Replies 7 ·
High School Could I have created 2.5 kg of energy in my experiment?
- Algr
- · Replies 15 ·
Undergrad Why must the metric be diagonal if inner products require matching indices?
- kent davidge
- · Replies 15 ·
Undergrad Does light from brake lights travel at c minus the car's speed?
- Tony Sims
- · Replies 2 ·
Undergrad Time: Questions for Curious Minds
- Vibin Narayanan
- · Replies 3 ·
Undergrad Understanding Wormhole Solutions to the Einstein Field Equations
- 1v1Dota2RightMeow
- · Replies 13 ·
Undergrad What exactly rotates in a rotating black hole?
- Farang
- · Replies 3 ·
High School Is Flatness a Relative Term in the Universe?
- newjerseyrunner
- · Replies 14 ·
Undergrad Does Planck Time Imply an Acceleration Limit?
- Battlemage!
- · Replies 2 ·
Undergrad What Are the Intriguing Questions Surrounding Time Dilation?
- bookofproofs
- · Replies 21 ·
High School Can velocity be determined in flat space?
- Chris Miller
- · Replies 43 ·
High School Spotting a Black Hole in the Microwave Background
- tionis
- · Replies 12 ·
Undergrad Stretching a rubber band increase its mass but how?
- Patrick Pihl
- · Replies 12 ·
High School Visualizing 3D Contours of Spacetime
- Easton Morrill
- · Replies 2 ·
Undergrad Why are spatial components equal to h_00 in weak field metric?
- needved
- · Replies 1 ·
High School Special case of the twin paradox in special relativity
- Jeff B L
- · Replies 19 ·
Undergrad Finding papers on Lorentz-invariant electromagnetism with magnetic charges
- nenyan
- · Replies 4 ·
Undergrad Physical meaning of distance in retarded solutions to linearized Einstein equations
- needved
- · Replies 1 ·
Undergrad Does global topology lead to a preferred frame in SR?
- maline
- · Replies 13 ·
Graduate Lack of uniqueness of the metric in GR
- RockyMarciano
- · Replies 21 ·
Undergrad Writing Components of a Metric Tensor
- kent davidge
- · Replies 6 ·
Undergrad Why do physicists show the magnetic field perpendicular to F
- physics user1
- · Replies 2 ·
Undergrad Rod falling through the event horizon of a black hole
- timmdeeg
- · Replies 27 ·
Undergrad Can gravitational waves carry energy if they're spacetime perturbations?
- epovo
- · Replies 9 ·
High School Do Twins Age Differently in Space?
- Chris Miller
- · Replies 75 ·
High School Do objects crossing a black hole's event horizon become black holes themselves?
- stoomart
- · Replies 10 ·
High School Where does the energy come from to straighten space after matter moves?
- UfoPilot
- · Replies 3 ·
High School A light beam that never interacts with matter
- Hercuflea
- · Replies 11 ·
High School Is the Speed of Light Affected by Human Measurement Methods?
- Chris Miller
- · Replies 47 ·
Graduate Sign convention in equations 10.85 and 10.108 of Nakahara's Geometry, Topology and Physics
- nenyan
- · Replies 2 ·
High School Why is E=mc² Defined with c Squared?
- STOKER
- · Replies 19 ·
Undergrad How can the Equivalence Principle hold when we consider tidal forces?
- Bernard
- · Replies 9 ·
High School Is Time Just a Perception or a Fundamental Aspect of Spacetime?
- Azaravicius
- · Replies 43 ·
Undergrad Complex Isomorphism Error in Lorentz Transform
- jk22
- · Replies 11 ·
High School Resistance of Space-Time fabric
- Ashiquee
- · Replies 7 ·
Graduate Isotropic metric and circumference of sphere
- Jonathan Scott
- · Replies 9 ·
Undergrad Why do EM tensors use partial derivatives instead of covariant ones in curved spacetime?
- Anypodetos
- · Replies 10 ·
Undergrad Generalized Tetrad Formalism for Rotating Spacetimes and the Equatorial Plane
- Vrbic
- · Replies 11 ·
High School Can objects falling into a black hole reach the speed of light?
- Allen_Wolf
- · Replies 11 ·
Undergrad Why Are Equally Spaced Events Preserved in Transformation?
- TonyEsposito
- · Replies 6 ·
Undergrad Light pulse entering a moving pipe in different reference frames
- MikeLizzi
- · Replies 30 ·
Undergrad Michelson Morley Experiment Light Source
- Shehreyar Khan
- · Replies 3 ·
Undergrad Why does time have to be a complex (Minkowski metric)?
- feryopo
- · Replies 4 ·
Undergrad Why is the interaction term -Aμjμ needed if forces come from field energy?
- Anypodetos
- · Replies 2 ·
Undergrad Solve Electromagnetic Field Acting on Charged Particle
- Mihai_B
- · Replies 3 ·
High School Learn Relativity Theory: Math Education Needed?
- modeler
- · Replies 2 ·
Graduate Relativity: Is "c" Speed in Vacuum Only?
- Jimber-Jaw
- · Replies 8 ·
Undergrad Stretched spring and change in mass
- Mohammed Shoaib
- · Replies 13 ·
High School Do black holes have a world line?
- tionis
- · Replies 10 ·
Undergrad Can we compute relativistic velocities of photons and neutrinos?
- petrushkagoogol
- · Replies 6 ·
High School A universal compass/speedometer
- Chris Miller
- · Replies 20 ·
High School A question of why time dilates and what is described by it
- DerringDerpy
- · Replies 32 ·
Graduate Connection, Metric and Torsion
- pervect
- · Replies 3 ·
Undergrad GR as a Graded Time Dilation Field in Euclidean Space?
- rjbeery
- · Replies 42 ·
High School Calculate Speed of Relativistic Rocket by Observation
- Azaravicius
- · Replies 5 ·
High School Are objects moving relative to each other?
- Azaravicius
- · Replies 4 ·
Undergrad Different definitions of differential forms in general relativity
- kent davidge
- · Replies 3 ·