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 Does the "space twin" benefit from length contraction?
- Peter Martin
- · Replies 136 ·
Undergrad Embedding Curved Spacetime in Noncurved Spacetime
- exponent137
- · Replies 1 ·
High School How To Consistently Explain Electromagnetism With Relativity
- Geocentricist
- · Replies 161 ·
High School Can We Really Stop Gravity by Altering Spacetime?
- Odette
- · Replies 5 ·
Undergrad What is distance fundamentally in spacetime?
- BobTheFrog
- · Replies 2 ·
Graduate Why is all the mass of a BH in the singularity?
- alex4lp
- · Replies 11 ·
Undergrad Velocity Relativity: Solving a Complex Problem
- PhysicallyAmazing
- · Replies 6 ·
Undergrad Can a moving object measure its own speed without external reference?
- erik giles
- · Replies 17 ·
Undergrad Do gravitational redshifts from atomic oscillations and escape add together?
- Mickey1
- · Replies 3 ·
Undergrad At what scale does quantum mechanics supersede general relativity?
- Giuliano97
- · Replies 3 ·
High School Why is the general theory of relativity is so complicated
- mr1batman
- · Replies 32 ·
High School Black Holes as Gateways to Parallel Universes?
- EnglandSP
- · Replies 1 ·
High School Do laws of reflection apply at the mirror in the Michelson-Morley experiment?
- GAURAV DADWAL
- · Replies 4 ·
Undergrad Why does the metric tensor depend on two coordinate systems?
- vibhuav
- · Replies 33 ·
Undergrad Why is proving Galilean and Lorentz transformations form groups so complicated?
- Malvia
- · Replies 18 ·
Undergrad Coordinate singularity at Schwarzschild radius
- zonde
- · Replies 57 ·
Undergrad Can Black Holes Create a Path for Lovers to Meet?
- stevendaryl
- · Replies 7 ·
Graduate Lorentz-Einstein law of motion for a point particle
- member 11137
- · Replies 1 ·
High School Metric Tensor and The Minkowski metric
- sqljunkey
- · Replies 2 ·
High School Does time dilation and length contraction apply in mediums like water?
- Mohammed Ayaz Quadri
- · Replies 9 ·
Undergrad Testing GR to What Energy Level?
- Arcturus7
- · Replies 5 ·
Undergrad Weak Gravitational Field: Solving Einstein Field Eqs
- deRoy
- · Replies 3 ·
High School What is the physics of motion through space?
- Netspirit
- · Replies 35 ·
Graduate Stress-energy tensor of a moving perfect fluid and dynamic pressure
- pervect
- · Replies 3 ·
Undergrad Can General Relativity Accommodate Spaces Without Killing Vectors?
- Tio Barnabe
- · Replies 6 ·
High School Time dilation and 2 identical clocks
- Ross Arden
- · Replies 90 ·
High School Pressure Vessel Length Contraction and Pressure Comparison in a Spaceship
- Ross Arden
- · Replies 26 ·
Graduate Why do quantities on maximally symmetric spacetimes depend only on geodesic distance?
- highflyyer
- · Replies 7 ·
Undergrad Why do different expansions of relativistic kinetic energy give different corrections?
- Das apashanka
- · Replies 14 ·
Undergrad Velocity addition and conservation of the energy
- sha1000
- · Replies 21 ·
High School How do different types of clocks stay synchronized?
- Torog
- · Replies 105 ·
Undergrad Can condensing E and M fields make light travel faster than c?
- Nicola321
- · Replies 2 ·
High School Why Isn't Work Equal to Einstein's E=mc²?
- learning_physica
- · Replies 8 ·
Undergrad Why the speed of light is constant for every observer?
- Arman777
- · Replies 9 ·
Undergrad How does spacetime curvature remain invariant if it depends on energy and momentum?
- Amaterasu21
- · Replies 9 ·
Undergrad Line Element in Minkowski Space: Geometric Meaning
- Joe Cool
- · Replies 3 ·
Graduate Correct coordinate transformation from Poincare-AdS##_3## to global AdS##_3##
- highflyyer
- · Replies 3 ·
Undergrad Survival Time in Black Hole: Myth Debunked
- nomadreid
- · Replies 9 ·
High School Why do photons allow Doppler shift
- Buckethead
- · Replies 57 ·
Graduate Resolving time dilation symmetry with relativity of simultaneity
- Erland
- · Replies 15 ·
High School Why Do We Need Gravitons for Understanding Gravity?
- Fig Neutron
- · Replies 8 ·
High School Life on a planet near a black hole
- livelar
- · Replies 10 ·
Undergrad What coordinates does the geodesic equation describe in Schwarzschild spacetime?
- Silviu
- · Replies 6 ·
Undergrad Evaluating metric tensor in a primed coordinate system
- vibhuav
- · Replies 7 ·
Undergrad Velocity difference not preserved in special relativity
- Malvia
- · Replies 6 ·
Undergrad Can gravitational waves perturb magnetic fields in magnetars?
- vibe3
- · Replies 11 ·
Undergrad Why doesn't space expansion affect time the way gravity does?
- Mayed Al-Tunaiji
- · Replies 5 ·
Graduate Connection between Euler's four-square identity and Maxwell's equations
- Edgar53
- · Replies 6 ·
Undergrad Einstein's views on gravity and inertia
- zonde
- · Replies 9 ·
Undergrad Can light near a black hole travel in -t in external coords?
- TGlad
- · Replies 10 ·
Graduate Using rockets to extend survival time below a black hole's event horizon
- tom.stoer
- · Replies 58 ·
Undergrad Some suspected Black hole mergers
- exponent137
- · Replies 2 ·
Undergrad Tetrad formalism outside of the equatorial plane
- Vrbic
- · Replies 17 ·
Undergrad Definition of Vector Field in General Relativity
- Jianbing_Shao
- · Replies 5 ·
High School Relativistic Spring-Mass Oscillator: A Paradox?
- Alfred Cann
- · Replies 9 ·
High School Why can't anything travel faster than light if motion is relative?
- nick J
- · Replies 8 ·
Undergrad What happens to the stuff that enters a black hole?
- Jay Addy
- · Replies 13 ·
High School Does Einstein's Field Equations Explain Space Density in Different Regions?
- sqljunkey
- · Replies 12 ·
Graduate Electron orbit in a moving hydrogen atom
- erik giles
- · Replies 47 ·
Undergrad Energy Change: PE to KE in Different Frames
- Dadface
- · Replies 8 ·
Undergrad Is Length Contraction Accounted for in the Analysis of a Moving Clock?
- Ross B
- · Replies 15 ·
High School Gravity Illusion: Questions on Space-Time Curvature Granularity
- gaaah
- · Replies 4 ·
Undergrad Non-zero components of Riemann curvature tensor with Schwarzschild metric
- Pencilvester
- · Replies 14 ·
High School Where does energy go if relativistic mass isn't real
- Jimmy87
- · Replies 25 ·
Undergrad Atomic Clock Running Rate: Adjustment Possibilities?
- exmarine
- · Replies 6 ·
Undergrad Verifying claims about backwards time travel
- girts
- · Replies 19 ·
High School Which clock is moving in the Hafele and Keating setup without gravity?
- Torog
- · Replies 12 ·
High School Performing experiments across an event horizon without tidal disruption
- Swamp Thing
- · Replies 16 ·
Graduate Faraday Tensor Conflicts: MTW vs. Wikipedia
- Cesarth
- · Replies 2 ·
Undergrad Is my thought right or wrong? Light and a moving observer
- thatoekhant
- · Replies 27 ·
Undergrad An exception to the principle of equivalence?
- e2m2a
- · Replies 18 ·
Undergrad Why metric on sphere, not flat metric, for tangent space vectors
- Silviu
- · Replies 9 ·
Undergrad Transformer Output in Non-inertial Frame: Frequency Change?
- Samson4
- · Replies 6 ·
High School What applications does gravitational wave detection have beyond confirming theory?
- parshyaa
- · Replies 7 ·
Graduate Global solution to parallel transport equation?
- Jianbing_Shao
- · Replies 10 ·
Undergrad Lorentz transformation approximation for small x values
- Santilopez10
- · Replies 14 ·
Undergrad How does time add up to 1 second with infinite smaller amounts of time?
- Gondur
- · Replies 16 ·
Undergrad What makes p₀ and p_φ conserved in a static spherical metric?
- Silviu
- · Replies 1 ·
Undergrad Was Einstein's Proof of E=MC^2 Flawed?
- bhobba
- · Replies 7 ·
Undergrad Time Dilation: Get Answers to Your Questions
- Junkwargo
- · Replies 3 ·
Undergrad Time Dilation and photodetectors
- Samson4
- · Replies 28 ·
Undergrad Why is the orthonormal basis in polar coordinates non-coordinate?
- Silviu
- · Replies 27 ·
Undergrad Frame Dragging Direction for Outward Moving Test Mass
- Sonderval
- · Replies 2 ·
Undergrad Does a single photon in a mirrored box contribute to the box's mass?
- kiwizimbo
- · Replies 11 ·
High School Why does an alien far away moving change what 'now' means for them?
- TheQuestionGuy14
- · Replies 18 ·
Undergrad Time dilation again, Einstein or Resnick?
- exmarine
- · Replies 114 ·
High School Is time dilation real in SR, actual in GR, or both?
- Edem
- · Replies 38 ·
Undergrad Confusion with relativity of simultaneity
- Grisha
- · Replies 29 ·
Undergrad Gravity changes produced by a compressed and stretched spring
- John K Clark
- · Replies 70 ·
Undergrad Twin paradox not including accelerations, it is wrong where?
- Luis Babboni
- · Replies 72 ·
Undergrad What is the Alice/Bob thought experiment in Malament-Hogarth spacetime?
- nomadreid
- · Replies 4 ·
Undergrad Do two clocks starting together show the same time if one travels twice as fast?
- cronnin
- · Replies 19 ·
High School Against length contraction explanation of magnetism
- jartsa
- · Replies 24 ·
High School Causality and the Lorentz transformation
- Joao
- · Replies 15 ·
Undergrad Computational physics - Light trajectory near black hole
- PhysicsMajorLeo
- · Replies 7 ·
High School How to measure Gravitational waves
- Number 42
- · Replies 49 ·
Graduate Free software for solving Einstein field equations as boundary value problems
- TGlad
- · Replies 3 ·
Undergrad GR: Mass of Potential Energy in Weak Field Limit
- zonde
- · Replies 6 ·
Undergrad Questions about the general principle of relativity
- Frank Castle
- · Replies 5 ·
Undergrad Does Gravity Affect Space Density in a Vacuum?
- grahas
- · Replies 6 ·