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 Why is spacetime arc length called proper time?
- Peeter
- · Replies 8 ·
Graduate Can particles move tangentially around a black hole's event horizon?
- Maniax
- · Replies 12 ·
Graduate Why does the traveling twin age less if both see each other's clock slow?
- AntigenX
- · Replies 124 ·
Graduate Understanding De Broglie's Wave-Frequency Relationship
- redtree
- · Replies 8 ·
Graduate Who Ages More in the Inverse Twin Paradox?
- granpa
- · Replies 1 ·
Graduate Basic thing with general relativity
- jostpuur
- · Replies 3 ·
Graduate Speed of light in a different medium
- uq_civediv
- · Replies 1 ·
Undergrad Time and speed of light problem
- super_kangaro
- · Replies 10 ·
Graduate Description of magnetic field in black holes
- Srr
- · Replies 1 ·
Graduate Solving the Paradox of Length Contraction on a Train
- Flexo
- · Replies 9 ·
Undergrad Can objects travel faster than light speed?
- x2thay
- · Replies 15 ·
Graduate Relativistically correct exression for Lorentz force
- mlh3789
- · Replies 4 ·
Undergrad Velocity of Objects Relative to Speed of Light
- Wannabeagenius
- · Replies 1 ·
Graduate Twins' paradox and acceleration
- neopolitan
- · Replies 8 ·
Graduate What is the significance of the Gamma-Relativity connection in modern physics?
- Wizardsblade
- · Replies 10 ·
Graduate Will the Alpha Centauri Lottery Winner Change with Rocket Acceleration?
- Ookke
- · Replies 9 ·
Graduate Can classical electromagnetism explain loss of simultaneity in moving objects?
- granpa
- · Replies 35 ·
Graduate Twin paradox: what do clocks show when the moving twin accelerates?
- granpa
- · Replies 43 ·
Graduate Is the singularity actually a manifestation of a higher dimensional object?
- mysearch
- · Replies 9 ·
Graduate Does a Black Hole Distinguish Particles?
- zarei
- · Replies 15 ·
Graduate Absolute speed of light conundrum
- Stanaz
- · Replies 4 ·
Graduate ?Strange? interpretation of Time-Dilation and it's implications
- jdodger
- · Replies 22 ·
Graduate Time dilation explanation for gravity?
- yuiop
- · Replies 5 ·
Graduate Is a Gauge Theory of Gravity Possible in Flat Spacetime?
- omar2
- · Replies 12 ·
Graduate Can Mallett's laser ring theory enable backward time travel?
- MaxPlank
- · Replies 29 ·
Graduate Relativistic cyclotron frequency
- jdstokes
- · Replies 3 ·
Undergrad Is PBS's Layman Explanation of E=mc^2 Accurate?
- trewsx7
- · Replies 4 ·
Graduate How can we tell if a given tensor is a curvature tensor?
- schieghoven
- · Replies 6 ·
Graduate Does space expand without time expanding in the FRW model?
- arroy_0205
- · Replies 5 ·
Graduate Everything travels at the speed-of-light ?
- trewsx7
- · Replies 8 ·
Graduate Does time dilation affect Doppler-shifted light frequency between moving frames?
- Chrisc
- · Replies 11 ·
Graduate Reconciliation of Maxwell's Equations with Relativity
- Usaf Moji
- · Replies 6 ·
Graduate Twin paradox with synchronized twin separation and acceleration
- Ookke
- · Replies 2 ·
Graduate Definition of Curvature for Sphere in Relativistic Cosmology
- maverick280857
- · Replies 7 ·
Graduate Is Lorentz transformation absolute
- Chrisc
- · Replies 51 ·
Graduate What are the meaning of monopole character and dipole character?
- xiaomaclever
- · Replies 2 ·
Graduate Time Dilation Near Black Holes: A Consequence of Mass and Singularity?
- blackwing1
- · Replies 2 ·
Graduate What is the Nature of Singularity Semantics?
- lzkelley
- · Replies 1 ·
Graduate Question on both Time Dilation and Lorentz Contraction
- Tyrusaur
- · Replies 4 ·
Undergrad At what speeds does relativity become noticable?
- SeaOfTea
- · Replies 2 ·
Graduate Possible Practical Applications of Gravity Waves
- Wizardsblade
- · Replies 2 ·
Graduate Has any facility developed a way to create gravity waves?
- Nenad
- · Replies 14 ·
Graduate Why does a moving clock show less elapsed time than a stationary one?
- laforge
- · Replies 4 ·
Graduate What Determines the Energy of a Two-Body Rotating System in General Relativity?
- I_wonder
- · Replies 1 ·
Graduate Relative velocity of third object
- newTonn
- · Replies 31 ·
Graduate How does Lorentz transformation manage to maintain the speed of light constant?
- AntigenX
- · Replies 6 ·
Graduate How can length contraction of a rod be measured?
- AntigenX
- · Replies 4 ·
Graduate Gravity vs Diffraction in Troposphere of a Star
- Buckeye
- · Replies 4 ·
Graduate Particle speed on a relativistic wheel?
- Wizardsblade
- · Replies 18 ·
Graduate On the speed of light, accelerate toward mass
- Nick89
- · Replies 10 ·
Graduate Confining a photon to form a black hole
- bernerami
- · Replies 2 ·
Graduate Why is the history of special relativity often overlooked in textbooks?
- Histspec
- · Replies 10 ·
Graduate What happens in Dingle's Dilemma when a moving clock meets a stationary one?
- mitesh9
- · Replies 57 ·
Graduate What are the implications of a Euclidean interpretation of special relativity?
- Mortimer
- · Replies 70 ·
Graduate If speed is susceptible to Doppler effect, why not gravitational fields?
- atom888
- · Replies 1 ·
Graduate Mathematics prerequisite to that of relativity
- fuzzy127
- · Replies 11 ·
Undergrad What do i need to know to move on to the Relativity ?
- Mad1kas
- · Replies 4 ·
Graduate Gravitational redshift versus time dilation in black hole spacetime
- mysearch
- · Replies 5 ·
Undergrad Does length contraction cause permanent changes like time dilation does?
- AntigenX
- · Replies 7 ·
Graduate (E,p)(E,-p) What pushes on a scale?
- Phrak
- · Replies 12 ·
Graduate Does a photon curve space-time, i.e., produce a gravitational field?
- redtree
- · Replies 38 ·
Graduate Use of covariant derivative in general relativity.
- arroy_0205
- · Replies 8 ·
Graduate Gravity Probe B and 'frame dragging'
- Ian
- · Replies 2 ·
Graduate Apparent superluminal velocity of galaxies
- scimeister
- · Replies 11 ·
Graduate Can Electromagnetic Forces Cause Relativistic Effects on Spin Particles?
- atom888
- · Replies 1 ·
Graduate Why does a sealed box with annihilating matter and antimatter float away?
- Phrak
- · Replies 13 ·
Graduate How can we see light moving with us if its speed is reduced by a factor of 100?
- Bigee
- · Replies 1 ·
Graduate Expression for the total energy of a particle of rest mass
- snoopies622
- · Replies 10 ·
Graduate Special Relativity question (from non-physicist)
- uby
- · Replies 6 ·
Graduate Flaw in the infinite fuel argument for why objects cannot reach light speed
- sumofprimes
- · Replies 17 ·
Undergrad What Causes the Asymmetry in the Twin Paradox of Time Dilation?
- kknull
- · Replies 7 ·
Graduate Does the Earth's spin impact time dilation for satellites and GPS receivers?
- mogsy182
- · Replies 1 ·
Undergrad How Does General Relativity Affect Satellite Orbits and Time Dilation?
- mogsy182
- · Replies 2 ·
Graduate Faraday's law of induction and special relativity
- LHS1
- · Replies 3 ·
Graduate Is is not that Simple? (about Lorentz transforms)
- mitesh9
- · Replies 20 ·
Undergrad Can Time Contract? Physics Teacher Bet
- Pinto da Cost
- · Replies 29 ·
Graduate What is Physical Significance of Lorentz Transforms ?
- mitesh9
- · Replies 18 ·
Undergrad Is time dilation caused by light frequencies?
- mikesvenson
- · Replies 24 ·
Undergrad What is aether and how does it relate to space and time?
- nuby
- · Replies 37 ·
Undergrad GPS & Relativity: Experiments & Simulations
- mogsy182
- · Replies 2 ·
High School Why doesn't gravity repel?
- Phy6explorer
- · Replies 23 ·
Graduate How Does Proper Time in Radial Free Fall Differ from Newtonian Predictions?
- Stoonroon
- · Replies 2 ·
Graduate Why does the Sagnac effect in GPS not imply light speed depends on Earth's rotation?
- O Great One
- · Replies 15 ·
High School Is Relativity Too Complex for Young Students to Grasp?
- Mad1kas
- · Replies 3 ·
Graduate How Is Relativistic Mass Measured Indirectly in Physics?
- bernhard.rothenstein
- · Replies 7 ·
Graduate Current Sagnac Effect Theory: PF Viewpoint
- HarryWertM
- · Replies 2 ·
Graduate Does gravity function as a lens, a prism or both?
- redtree
- · Replies 1 ·
Undergrad Why Can't Photons Have Rest Mass?
- fireball3004
- · Replies 7 ·
Graduate Does a relativistic rolling ball wobble?
- bwr6
- · Replies 125 ·
Graduate Gravity: A Dual Role as a Lens and a Prism for Light?
- redtree
- · Replies 2 ·
Graduate Aether attached to Earth explains classic experiments
- hartlw
- · Replies 2 ·
Graduate Do photons experience time if events require time to happen?
- shelanachium
- · Replies 15 ·
Graduate Why does the second postulate specifically refer to c?
- neopolitan
- · Replies 13 ·
Graduate Why is the idea of Aether being attached to Earth questioned?
- hartlw
- · Replies 3 ·
Graduate Solving Friedmann's Dust-Filled Equation for Radial Geodesics
- bjaw
- · Replies 5 ·
Graduate Sign convention in the space-time 4-vector
- redtree
- · Replies 9 ·
Graduate Twins Paradox and acceleration
- Bose
- · Replies 4 ·
Undergrad What Is Einstein's Geometric Model of Gravitation?
- Seraph404
- · Replies 14 ·
Undergrad How is a photon's energy determined from wavelength and frequency?
- nuby
- · Replies 4 ·
Graduate Discuss events which are simultaneous in one frame?
- neopolitan
- · Replies 280 ·