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 there a limiting speed for particles due to energy loss in acceleration?
- hartlw
- · Replies 1 ·
Graduate Object Falling into a Black Hole: What Happens?
- michael879
- · Replies 6 ·
Graduate Accelerating Twice: Astronaut Achieves .99999c in Nuclear Ship
- Buckethead
- · Replies 9 ·
Undergrad How does the speed of light affect the rotation of a disc?
- zarbanx
- · Replies 36 ·
Who is the author of mathpages.com?
- Chris Hillman
- · Replies 9 ·
Graduate Why is the 3 momentum represented with a negative sign in the 4-vector?
- Davio
- · Replies 8 ·
Graduate Is Time Travel Possible and What Are Its Implications?
- mlw
- · Replies 55 ·
Graduate How does an object know that it is in motion?
- korinteren
- · Replies 22 ·
Undergrad Creating a Common Frame of Reference for Remote Astronauts
- rab99
- · Replies 8 ·
Graduate What happens to the pythagorean theorem in a non-euclidean space?
- Ulysees
- · Replies 14 ·
Graduate Does the equivalence principle imply nonlinearity of Einstein's equations?
- Thrice
- · Replies 1 ·
Graduate My response to an anti-relativist
- aaj
- · Replies 30 ·
Graduate Why is ct used as the fourth dimension in Special Relativity?
- NanakiXIII
- · Replies 14 ·
Undergrad Why is there a speed limit for light and particles?
- likephysics
- · Replies 5 ·
Graduate Is special relativity just an illusion of time and space?
- Denton
- · Replies 12 ·
Graduate The stress energy tensor again
- snoopies622
- · Replies 9 ·
Graduate What is the explanation for the null result in the Trouton-Noble experiment?
- erastotenes
- · Replies 2 ·
Graduate Relativity Revisited by Lopis and Tegmark
- robphy
- · Replies 3 ·
Graduate What is the Flaw in Applying the Lorentz Factor to Time Dilation?
- A(s)
- · Replies 30 ·
Graduate Where does the energy loss from redshifted photons go?
- josephpalazzo
- · Replies 4 ·
Undergrad Can consumer atomic clocks detect gravitational time dilation in a stairwell?
- AlfaEcosse
- · Replies 10 ·
Graduate T of t' and x of x' with respect to S
- arbol
- · Replies 10 ·
Graduate Can Time Dilation Be Used to Identify a Moving Frame of Reference?
- rab99
- · Replies 4 ·
Graduate Traveling into the future in order to travel back into the past
- Benzoate
- · Replies 11 ·
Undergrad Can You Take a Photo of Something Traveling at Light Speed?
- epithet
- · Replies 28 ·
Graduate The Lorentz Group in General Relativity
- princeton118
- · Replies 1 ·
Undergrad Is Time Dilation Only About Velocity and Massive Objects?
- rab99
- · Replies 3 ·
Graduate What Phenomenon Causes Light to Change Direction Near a Black Hole?
- Gamerex
- · Replies 5 ·
Graduate Can energy be converted into mass in nuclear reactions?
- manjuvenamma
- · Replies 10 ·
Graduate Can Photons Orbit in Flat Spacetime?
- duordi
- · Replies 1 ·
Graduate Lorentz Transformation via Rotation
- snoopies622
- · Replies 3 ·
Graduate Does General Relativity Suggest a Younger Age for a Free-Falling Twin?
- mysearch
- · Replies 6 ·
Graduate Negative Rest Mass: Faster than Light?
- Daedalus_
- · Replies 1 ·
Graduate What is the Name of the Four-Vector with p-eA?
- actionintegral
- · Replies 2 ·
Graduate Can negative mass allow faster-than-light travel?
- eNathan
- · Replies 38 ·
Undergrad Experiments in a revolving satellite
- manjuvenamma
- · Replies 6 ·
Graduate How to measure absolute velocity
- rab99
- · Replies 13 ·
Graduate Mass transfer between black holes
- shalayka
- · Replies 1 ·
Graduate How can you find an absolute reference frame if the universe is bounded?
- rab99
- · Replies 14 ·
Undergrad Born Rigid Motion - references
- pervect
- · Replies 2 ·
Graduate Lorentz invariance and General Coordinate transformations
- kdv
- · Replies 3 ·
Graduate Clock Synchronisation in Stationary and Accelerated Frames
- rab99
- · Replies 14 ·
Graduate How Does Gravity Influence Spacetime and Time Dilation?
- GRB 080319B
- · Replies 11 ·
Graduate Are Scaled and Summed Four-Vectors Still Four-Vectors?
- Dale
- · Replies 12 ·
Graduate Can a beam of light be a valid reference frame in special relativity?
- Rapt0rzzz
- · Replies 5 ·
Undergrad Twin Paradox: Jerry vs Tom's Time Dilation
- choon_min
- · Replies 1 ·
Undergrad Can relative velocity exceed the speed of light in special relativity?
- choon_min
- · Replies 1 ·
Graduate Is the Speed of Light Really Slowing Down?
- jonegil
- · Replies 29 ·
Undergrad Bending of Light: Other Observations Beyond Eddington
- spidey
- · Replies 7 ·
Graduate Why does the Ehrenfest paradox circumference not equal 2π times the radius?
- aaj
- · Replies 2 ·
Graduate Does GR say anything about solid angle deficit?
- Jonathan Scott
- · Replies 4 ·
Graduate Momentum in the time direction
- snoopies622
- · Replies 4 ·
Undergrad Is Light's Gravity Influenced by Other Light?
- hvirgen
- · Replies 8 ·
Graduate How Does Relative Motion Affect Time Measurement in Different Reference Frames?
- arbol
- · Replies 9 ·
Graduate Is there a peak in the center of a GR space-time well?
- siphon
- · Replies 32 ·
Undergrad Does E=mc² fully account for an object's total energy including kinetic energy?
- frankencrank
- · Replies 16 ·
Graduate Relativistic mass and energy in moving objects versus thermal energy
- GRB 080319B
- · Replies 5 ·
Would Hitting a Micro Black Hole with Your Hand Create a Hole?
- Denton
- · Replies 1 ·
Undergrad Are Photons Massless But Still Have Momentum?
- dkgolfer16
- · Replies 1 ·
Graduate Questioning Zero Reference and the Expansion of the Universe
- siphon
- · Replies 2 ·
Graduate Light Speed Travel and Causality
- Violator
- · Replies 24 ·
Graduate Size of Black Hole: Swallow 1.5m x 3.585m x 20cm?
- Gramsci
- · Replies 5 ·
Graduate What Defines the Coefficient of Restitution in Relativistic Collisions?
- abhaiitg
- · Replies 21 ·
Graduate Not to defend Phrak, but i have a related question
- rbj
- · Replies 20 ·
Graduate Length contraction v. time dilation
- tomtraxler
- · Replies 4 ·
Graduate How Do New Space-Time Coordinate Transformations Impact Clock Synchronization?
- bernhard.rothenstein
- · Replies 1 ·
Graduate More Spacecraft Velocity Anomalies
- lwymarie
- · Replies 14 ·
Graduate A question regarding length contraction
- aaj
- · Replies 6 ·
Graduate Does unequal time flow explain gravity better than a separate gravitational force?
- Xeinstein
- · Replies 11 ·
Graduate ModifiedGravity.htmlWhat are the limitations of General Relativity?
- MathematicalPhysicist
- · Replies 8 ·
Graduate Crossing Event Horizon of Black Hole: What Happens?
- Ironlenny
- · Replies 5 ·
Graduate How do clocks measure time without external energy input?
- Phrak
- · Replies 4 ·
Graduate Is Time Dilation a Result of Matter's Intrinsic Motion?
- petm1
- · Replies 22 ·
Graduate Can You Escape the Gravitational Pull of a Black Hole?
- Xeinstein
- · Replies 2 ·
Graduate Meaning of diffeomorphism invariance?
- kdv
- · Replies 6 ·
Graduate What is Relativistic Heat Force? Any Research Papers on This Topic?
- Frank Lampard
- · Replies 5 ·
High School Does a dimension have dimensions?
- ahmedhassan72
- · Replies 13 ·
Undergrad Does a photon have mass?
- Rel
- · Replies 2 ·
Graduate Understanding Time and Space as One entity.
- dswam
- · Replies 92 ·
Graduate Coordinate acceleration without a Force
- the shadow
- · Replies 1 ·
Graduate Deriving gravitational redshift using the energy change approach
- Crazyevox
- · Replies 12 ·
Graduate Two-spaceship paradox This solution incorrect
- J.F.
- · Replies 46 ·
Graduate Maximum speed of anything, temperature
- Learnphysics
- · Replies 4 ·
Graduate So what has happened to the GPE (Gravitational Potential Energy)?
- Xeinstein
- · Replies 6 ·
Graduate Problem with thought experiment
- joey_m
- · Replies 27 ·
Undergrad Is Magnetism Related to Einstein's Relativity?
- Harmony
- · Replies 1 ·
Graduate Ricci tensor equals a constant times the metric
- Pacopag
- · Replies 3 ·
Graduate What's wrong with Michelson's explanation of ether dragging?
- joey_m
- · Replies 26 ·
Graduate Is a reference frame at rest near a massive object inertial?
- Xeinstein
- · Replies 2 ·
High School Does Gravity Move Off? Your Answers Needed
- matteo16
- · Replies 7 ·
Graduate Does Pi Relate to Space-Time's Curvature?
- hedons
- · Replies 18 ·
Graduate How many Vernal Equinoxes does a 0.999c ship passenger observe en route to Earth?
- Xeinstein
- · Replies 4 ·
Graduate Deriving ds^2 = ds'^2 in Special Relativity
- Living_Dog
- · Replies 14 ·
Graduate Does absolute acceleration exist in relativity and the twin paradox?
- joey_m
- · Replies 15 ·
Graduate General Coordinate transfos vs Lorentz transfos in GR
- kdv
- · Replies 8 ·
Graduate Is light travel time for event time calculation usually implicit?
- DocZaius
- · Replies 5 ·
Undergrad How Do Black Holes Exert Gravity If They Absorb Light?
- sajithcv
- · Replies 1 ·
Graduate Revisiting the lesson of the Relativity of Simultaneity
- joey_m
- · Replies 30 ·
Graduate What is the answer to the Twins Paradox confusion in relativity?
- Xeinstein
- · Replies 6 ·
Undergrad Deflection angle of a ray grazing the sun
- spidey
- · Replies 2 ·