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 Is Time Dilation Affected by Varying Mass Density in Identical Universes?
- PFanalog57
- · Replies 2 ·
Undergrad Differentiate between the two masses in equation for relativistic mass
- answerseeker
- · Replies 1 ·
Graduate Absolute motion, is it detectable?
- Callisto
- · Replies 14 ·
Graduate Can a spear simultaneously hit two switches in all frames?
- HungryChemist
- · Replies 4 ·
Undergrad Special relativity- time expansion
- answerseeker
- · Replies 4 ·
Graduate What I tell laymen who ask me about SR
- Crosson
- · Replies 35 ·
Graduate How is energy conserved in general relativity?
- Starship
- · Replies 6 ·
Undergrad Special relativity and substitution
- answerseeker
- · Replies 5 ·
Graduate What is a spinning space station spinning relative to?
- moving finger
- · Replies 81 ·
Graduate Understanding Time Dilation in Special Relativity
- bayan
- · Replies 10 ·
Graduate Speed of light measured the same by all inertial observers?
- metrictensor
- · Replies 6 ·
Graduate Calculating Arrival Time Difference for Particles Produced in a Distant Galaxy
- babtridge
- · Replies 5 ·
Undergrad What happens to time and perception when traveling at light speed?
- uk9999
- · Replies 35 ·
Undergrad Why does refraction of light involve a difference in speed?
- Evans of Sprot
- · Replies 3 ·
Undergrad What happens to gravitational force when two point masses get arbitrarily close?
- T@P
- · Replies 14 ·
Graduate Who does time really slow down for?
- eNathan
- · Replies 22 ·
Graduate What are the earliest online publications discussing the Twin Paradox?
- Prague
- · Replies 2 ·
High School E =mc{squared} How Did He Arrive At This ?
- nu_paradigm
- · Replies 30 ·
Graduate Time travel and cosmic strings
- Hercule Poirot
- · Replies 3 ·
How Can I Use My Spaceship to Reset My Clock?
- The Rev
- · Replies 8 ·
Graduate What is the Aether Bunny in Lorentz relativity?
- RandallB
- · Replies 2 ·
Graduate How Does Time Dilation Affect Colony Ships A and B in Relativity Theory?
- Dropout
- · Replies 45 ·
Graduate Does anybody have a better analogy of describing space-time curvature?
- Dropout
- · Replies 9 ·
Graduate How Does Gravity Affect Time Near Earth's Core?
- RandallB
- · Replies 2 ·
Graduate Time Dilation and Video Transmission in Relativistic Spaceships
- Kilroy-was-here
- · Replies 3 ·
Graduate Relativity situation. Questions.
- hedons
- · Replies 2 ·
Graduate Gravitational clumping in a closed universe of pure radiation
- moving finger
- · Replies 13 ·
Undergrad I know how to travel faster than light :\
- eNathan
- · Replies 6 ·
Undergrad Lorentz transformations explanation?
- guevaramartyr
- · Replies 11 ·
Graduate Could Time Dilation Explain the Huge Redshifts Observed in Distant Stars?
- NewImage
- · Replies 7 ·
Undergrad Why can energy be converted into matter but not the other way around?
- oldunion
- · Replies 10 ·
Graduate Does light bending doubly violate the equivalence principle?
- wisp
- · Replies 5 ·
Undergrad An odd sort of symmetry about E=MC^2
- Dropout
- · Replies 4 ·
Graduate Conservation Principle Related to Expanding Space?
- jrdev
- · Replies 4 ·
Undergrad Why Can One Train Start Up Faster Than the Other After Braking Nose to Nose?
- Jimmy Snyder
- · Replies 26 ·
Graduate Twin paradox in a closed universe that collapses
- Garth
- · Replies 44 ·
High School Does magnetism affect gravity?
- Someone502
- · Replies 8 ·
Undergrad Is the traveling twin actually younger in the twin paradox?
- cire
- · Replies 129 ·
Undergrad What do you see at light speed?
- Raptor483
- · Replies 7 ·
High School What happens to time and speed at the speed of light?
- bayan
- · Replies 18 ·
Graduate What Are the Degrees of Freedom for a Massive Spin 1 Particle?
- joshuaw
- · Replies 16 ·
Graduate Can anything physical move in space-time?
- X-43D
- · Replies 6 ·
Graduate Why is Einstein's GTR a theory of gravity and a geometric theory?
- Crosson
- · Replies 2 ·
Graduate Is Phase Velocity Greater than c in Spacetime?
- spacetime
- · Replies 24 ·
Graduate What's the Flaw in the Relativity Paradox of Gravity and Speed?
- Shaw
- · Replies 4 ·
Undergrad Ether drag hypothesis
- Reshma
- · Replies 105 ·
Undergrad Using four-vectors in derivations and proofs
- JFo
- · Replies 6 ·
Undergrad Fleeing earth at the speed of light
- Pengwuino
- · Replies 5 ·
Undergrad Can a runner at light speed catch light in a race?
- Razor436
- · Replies 24 ·
Undergrad Why is one twin younger in the twin paradox?
- Lakshminarayanan.V
- · Replies 17 ·
Graduate Definition of 4-vector quantities
- steveurkell
- · Replies 3 ·
Graduate Reverse engineering relativity?
- selfAdjoint
- · Replies 6 ·
Graduate What Are the Effects of Mass and Energy on the Universe's Future?
- DMuitW
- · Replies 2 ·
Time machine possible or impossilble
- Qyamat
- · Replies 29 ·
Graduate Tensor gradient and maxwell's equation
- steveurkell
- · Replies 2 ·
Undergrad Why does E=mc² suggest the speed of light varies?
- Vereinsamt
- · Replies 5 ·
Graduate Invariants in general relativity
- eljose
- · Replies 2 ·
Graduate Derivation of Lorentz Transformations
- Ed Quanta
- · Replies 12 ·
Graduate Did the Fitzgerald-Lorentz Contraction Explain the Michelson-Morley Experiment?
- HannonRJ
- · Replies 7 ·
Graduate Second Postulate of Special Relativity
- Icebreaker
- · Replies 7 ·
Graduate Are Both Twins Equivalent in a Torus Universe with the Twin Paradox?
- touqra
- · Replies 32 ·
Graduate Why do we call light's speed a velocity if it's invariant?
- Symbreak
- · Replies 5 ·
Einstein conferences in the US or Canada for the special relativity centenary
- RandallB
- · Replies 2 ·
Graduate Question from I. KINEMATICAL PART § 1. Definition of Simultaneity
- arrell
- · Replies 19 ·
Graduate Why is time dilation expressed as t' in special relativity?
- DB
- · Replies 9 ·
High School E=MC^2 - Do I have this right?
- ShadowKnight
- · Replies 8 ·
Undergrad Is there a thread or website to learn the theory of relativity from A-Z?
- guevara0001
- · Replies 11 ·
Graduate Why does a lever with balanced torques appear to rotate in a relativistic frame?
- genxhis
- · Replies 22 ·
Graduate Black Holes in the Very Early Universe
- DrChinese
- · Replies 9 ·
Graduate A little problem in general relativity;momentum
- haushofer
- · Replies 13 ·
Graduate What is the Limits of Lorentz Transformation when (v/c->1)?.
- controlfreak
- · Replies 8 ·
Graduate GR: Black Hole - Electrical Charge
- RandallB
- · Replies 2 ·
Graduate What explains the increase in mass at high speeds?
- Symbreak
- · Replies 10 ·
Graduate Harmless Lorentz transformation question
- Physicsguru
- · Replies 101 ·
Graduate Is only GR enough for proved the event horizon
- hypernova
- · Replies 4 ·
Graduate How Do Lorentz Transformations Work with Y and Z Components of Speed?
- quasar987
- · Replies 29 ·
Graduate Relativistic Mass of an Orbiting Billiard Ball
- Physicsguru
- · Replies 44 ·
Undergrad Was relativistic mass disproven recently?
- misogynisticfeminist
- · Replies 16 ·
Graduate Derivation of the momentum-energy relation
- misogynisticfeminist
- · Replies 10 ·
Graduate Is the General Theory of Relativity Worth Learning from a Troll?
- ClarkKent
- · Replies 7 ·
Graduate New to Relativity:Need Answers
- Raptor483
- · Replies 4 ·
Graduate Relativity and temperature question
- Physicsguru
- · Replies 52 ·
Einstein's Mass-Energy Equivalence
- quasar987
- · Replies 7 ·
Graduate Classical unification of general relativity and electromagnetism
- metrictensor
- · Replies 26 ·
Graduate Why Does Light Have No Rest Mass While Other Particles Do?
- munky99999
- · Replies 10 ·
Graduate Weighing Mass of Photons in Different Directions
- gonzo
- · Replies 16 ·
Graduate Is matter truly keeping pace with the expansion of space?
- wolram
- · Replies 26 ·
Graduate Laser chase gedanken experiment and time dilation
- cepheid
- · Replies 5 ·
Undergrad Plank & Bullet Experiment: Questions Explained
- Infamo
- · Replies 2 ·
Undergrad Galilean Transformation Question
- misogynisticfeminist
- · Replies 4 ·
Graduate Time Reversed: Can Humans Think?
- eNathan
- · Replies 6 ·
Graduate RF SR: What If I'm Anchored to a Moving Train?
- misogynisticfeminist
- · Replies 2 ·
Undergrad Derivation of relativistic energy
- misogynisticfeminist
- · Replies 2 ·
Graduate Is time dialation really *time* dialation?
- CarpetFilter
- · Replies 5 ·
Graduate Hamilton-Jacobi equation for Gr
- eljose
- · Replies 2 ·
Graduate Relativistic effects in non-vacuous media
- freemind
- · Replies 3 ·
Graduate Possible solution for dark energy
- wolram
- · Replies 14 ·
Graduate Can a spacecraft accelerate to light speed in 24 hours?
- Physicsguru
- · Replies 84 ·
Undergrad What Experiments Provide Evidence for General Relativity?
- djmike
- · Replies 8 ·
Undergrad What does the gamma factor represent and how is it calculated?
- Infamo
- · Replies 4 ·