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 Faster than Light Travel Question
- masonroese
- · Replies 3 ·
Graduate Perceived time and distance at Speed of light
- Dave Apsey
- · Replies 17 ·
Graduate Quick tetrad/vierbein question
- unchained1978
- · Replies 7 ·
Graduate Understanding Frame of Reference in Special Relativity
- Lucy Yeats
- · Replies 12 ·
Graduate Does the twin paradox apply to a round trip around Earth?
- A Dhingra
- · Replies 12 ·
Graduate What is the Significance of the Lambda Symbol in Transformation Matrices?
- peter46464
- · Replies 1 ·
Graduate I don't understand photon clocks
- bshul
- · Replies 26 ·
Undergrad Does Relativity Theory Explain Why Racing Drivers Age Slower?
- dramtulla
- · Replies 6 ·
Undergrad How is relativity theory applied to gps?
- francisco
- · Replies 8 ·
High School Can We Really See Into the Past by Observing Distant Worlds?
- ianpr
- · Replies 14 ·
Graduate How are the ways in which time is dialted unified?
- enfield
- · Replies 4 ·
Graduate Time dilation integral for accelerated reference frames with varying velocity
- enfield
- · Replies 10 ·
Undergrad How did light speed become the governor of relativity?
- narrator
- · Replies 31 ·
Graduate Do stationary clocks stay synchronized when one car accelerates?
- goodabouthood
- · Replies 6 ·
Graduate Different Slices of Now Observable from Earth?
- Vanadium90
- · Replies 37 ·
Graduate Can Negative Mass Really Defy Gravity?
- stglyde
- · Replies 9 ·
Graduate What experiment shows that the universal speed limit is the same as light?
- thenewmans
- · Replies 3 ·
Undergrad Why Is Light Speed a Limit for Spacecraft?
- machine_slave
- · Replies 11 ·
Graduate I would like to see the math of something
- JT73
- · Replies 30 ·
Graduate How does time dilation relate to Earth's motion through space?
- rsclafani
- · Replies 4 ·
Graduate Spacetime desynchronized in quantum realm?
- stglyde
- · Replies 2 ·
Graduate Diagonal Metric and General Relativity: A Fundamental Question
- isidrago
- · Replies 3 ·
Graduate What happens to stars in front of a falling observer entering a black hole?
- Passionflower
- · Replies 2 ·
Graduate Does a Photon Traveling at Light Speed Imply Infinite Mass and Energy?
- E=mc4
- · Replies 30 ·
Graduate Question of units of B, H in Gaussian system
- Master J
- · Replies 4 ·
Undergrad I have a question for the masses. if you were traveling at 60 mph
- trix5153
- · Replies 20 ·
Graduate Does superposition work for the metric tensor of two bodies?
- tarquinius
- · Replies 5 ·
Graduate Can a Car's Stereo Still Function at the Speed of Light?
- Ransom7D
- · Replies 1 ·
Graduate Examples of inextendible worldlines in spacetime manifolds
- Matterwave
- · Replies 11 ·
Mind-Bending Mirror Puzzle: Experience the Impossible in Bali
- PatrickPowers
- · Replies 5 ·
Graduate Does time stop for a photon? Why is that a nonsensical question?
- JamieForum
- · Replies 51 ·
Graduate Gravitational field conceptual question
- PrakashPhy
- · Replies 8 ·
Graduate Calculating GPS Accuracy Using Special Relativity and General Relativity
- godtripp
- · Replies 1 ·
Graduate What is the observed precession of Mercury?
- utesfan100
- · Replies 33 ·
Graduate Can Time Dilation Allow for Survival of the Universe's Death?
- Mind Bender
- · Replies 9 ·
Graduate Solving Sliding Clock Fun with Two Photons
- Zula110100100
- · Replies 11 ·
Graduate How Does General Relativity Explain Earth's Shape and Gravity?
- PatrickPowers
- · Replies 6 ·
Graduate Is Gravity Just Inertia in Disguise?
- Gomjabbar
- · Replies 2 ·
Graduate Relativistic mass increase appearing to form a black hole vs. a real black hole
- Meatbot
- · Replies 9 ·
Graduate Do cells in a traveling twin's body age differently?
- YummyFur
- · Replies 5 ·
Graduate Studying special relativity and using the idea of four vectors
- JFo
- · Replies 8 ·
Graduate Objects move into gravity=shorter time?
- gabeeisenstei
- · Replies 25 ·
Graduate Lorentz Transformations Acceleration: A simple problem
- Albertgauss
- · Replies 2 ·
Graduate Velocity of particle at 0.9c in frame of accelerating observer
- pervect
- · Replies 4 ·
Graduate The principle of inertia and hypothetical FTL particles
- lalbatros
- · Replies 5 ·
Graduate Is a gravitational circuit possible?
- Tosh5457
- · Replies 12 ·
Graduate Abraham's light momentum breaks special relativity?
- sciencewatch
- · Replies 153 ·
Undergrad Can a human travel to distant stars? And other questions.
- WindScars
- · Replies 24 ·
Graduate Why faster-than-light messaging doesn't create causality paradoxes
- AdrianMay
- · Replies 3 ·
Graduate What is the effect of a neutron star's gravity on vertical rays of light?
- penomade
- · Replies 4 ·
Graduate Why does one triplet age differently if they stop accelerating at different times?
- Waaaaaaaa
- · Replies 16 ·
Graduate Usefulness of Kretschmann scalar
- HolyCats
- · Replies 5 ·
High School List of different relative speeds?
- JT73
- · Replies 13 ·
High School If light hits a mirror and then switches direction
- seerskater
- · Replies 5 ·
Graduate FTL implies Backward Time Effect
- stglyde
- · Replies 13 ·
Graduate About dark matter and the limits of the universe.
- WindScars
- · Replies 3 ·
Undergrad Why cant an object travel faster than the speed of light?
- homeylova223
- · Replies 13 ·
Graduate What are the differences between an object with mass 0 and mass > 0 ?
- digi99
- · Replies 4 ·
Graduate What Do Upper and Lower Indices in Tensor Notation Signify?
- taylrl3
- · Replies 1 ·
Graduate Einstein's original 'thought experiment'
- M1keh
- · Replies 19 ·
Graduate Relativistic doppler effect - inconsistency in my derivations
- osturk
- · Replies 4 ·
Graduate Why does light always travel at c in different reference frames?
- Xilor
- · Replies 6 ·
Graduate 2nd order correction to gauge transformation
- matt91a
- · Replies 4 ·
Graduate Does Time Dilation Apply to the Big Bang's Mass?
- eddybob123
- · Replies 1 ·
Graduate The speed of light and the mass of a photon
- JollyOlly
- · Replies 24 ·
Graduate Wald's definition of the Cauchy Horizon
- Matterwave
- · Replies 1 ·
Graduate What if speed limit is slightly faster than light?
- thenewmans
- · Replies 8 ·
Graduate Redshift and Weak equivalence principle
- Zula110100100
- · Replies 10 ·
Graduate What is the Metric Tensor and How is it Used in Tensors?
- Mazulu
- · Replies 52 ·
High School What is causality?
- Casco
- · Replies 1 ·
Graduate Light travel time between collinear moving rockets at c/2
- Waaaaaaaa
- · Replies 6 ·
Graduate How do accelerometers measure acceleration without using relative motion?
- Zula110100100
- · Replies 38 ·
Graduate How Does Gravity Store Arbitrarily Negative Energy?
- Lapidus
- · Replies 3 ·
Graduate How to explain time dilation easily to others, maybe like this ?
- digi99
- · Replies 19 ·
Graduate Derivation of relativistic acceleration and momentum
- phys23
- · Replies 13 ·
Graduate Variational methods on Lagrangians (D'Inverno Chapter 11) - continued
- TerryW
- · Replies 21 ·
Graduate The Illusion of Time and distant observers
- mjames
- · Replies 20 ·
Graduate Black holes and time dilation around the event horizon
- Domisterwoozy
- · Replies 38 ·
Graduate Speed of light - why is it a constant?
- Shenstar
- · Replies 53 ·
Graduate How can a moving observer see light reflected from a mirror they've moved away from?
- digi99
- · Replies 20 ·
Undergrad Measuring Distance to a Star One Light Year Away at 0.5c Speed
- PatrickPowers
- · Replies 2 ·
Graduate You approach a planet at a velocity near c, what do you see?
- cowmoo32
- · Replies 3 ·
Graduate Is Time Speeding Up? The Possibility of a Universally Accelerating Clock
- dshaw
- · Replies 4 ·
Graduate Is SR and GR Time Dilation the same thing?
- goodabouthood
- · Replies 50 ·
Graduate Mathematical Basis for Learning Relativity
- gordonj005
- · Replies 1 ·
Graduate Can time slow down infinitely in black holes?
- Xilor
- · Replies 6 ·
Graduate Wormholes and time travel paradox in Greene's Fabric of the Cosmos
- Caeru
- · Replies 7 ·
Graduate Length contraction and accelerating frames
- yoron
- · Replies 2 ·
Graduate How does relativity explain the different experiences of now for two observers?
- jtaravens
- · Replies 18 ·
Graduate Why so many definitions of an inertial frame?
- peter46464
- · Replies 13 ·
Graduate Scientific measurement standards
- mes314159
- · Replies 2 ·
Graduate Can quantum entanglement create time loops if it uses superluminal exchange?
- stglyde
- · Replies 2 ·
Graduate What Are Lapse Functions in 3+1 General Relativity?
- Mazulu
- · Replies 1 ·
Undergrad Does a clock on Earth appear to speed up as a decelerating rocket lands?
- Dickie_Boy
- · Replies 9 ·
Graduate Is there really an absolute reference frame?
- pche8701
- · Replies 22 ·
Undergrad Is it Possible for A to See B Moving Faster?
- JT73
- · Replies 6 ·
Graduate Finding Equations of Motion from the Stress Energy Tensor
- Matterwave
- · Replies 49 ·
Graduate Why Is General Relativity Hard to Work With?
- PatrickPowers
- · Replies 2 ·
Graduate Symmetry in special relativity
- PatrickPowers
- · Replies 9 ·
Graduate The Lorentz Transformations and a Few Concerns
- Anamitra
- · Replies 43 ·