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 Why does each clock see the other's period as longer in time dilation?
- Chenkel
- · Replies 88 ·
Undergrad Why can both the plane and airport clocks run slower in special relativity?
- Chenkel
- · Replies 27 ·
High School How does hawking radiation escape a black hole?
- SheldonCooper13
- · Replies 11 ·
Undergrad Is there a theorem that we can't see objects getting behind EHs?
- Pony
- · Replies 5 ·
High School Intuition for time dilation in a cesium clock
- msumm21
- · Replies 58 ·
Graduate What Are the Must-Read Einstein Papers on General Relativity and Beyond?
- AndreasC
- · Replies 46 ·
Undergrad How Do Interparticle Interactions Affect Buoyant Force in Gases?
- Leticia
- · Replies 0 ·
Undergrad Linearising Christoffel symbols
- chartery
- · Replies 9 ·
Undergrad Intuition regarding Riemann curvature tensor
- Hill
- · Replies 3 ·
Undergrad Lie dragging vs Fermi-Walker transport along a given vector field
- cianfa72
- · Replies 26 ·
High School What Is the Fourth Dimension and How Does It Work?
- eggy
- · Replies 3 ·
Graduate Negative energy in Hawking radiation
- Demystifier
- · Replies 1 ·
Graduate Where exactly is the wormhole in the Kruskal-Szekeres diagram?
- haushofer
- · Replies 43 ·
High School A well defined thought experiment
- Mikael17
- · Replies 55 ·
Undergrad Lentz superluminial solution, anything new on it?
- Randy Subers
- · Replies 1 ·
High School Does light reach a moving eye in time D/(c±v)?
- Chenkel
- · Replies 3 ·
High School Why Do Bob and Alice Disagree on Astronomical Measurements?
- Mikael17
- · Replies 25 ·
Undergrad From our reference frame, how would a black hole ever form?
- msumm21
- · Replies 5 ·
Undergrad Kerr disputes singularities in Kerr Black Holes
- .Scott
- · Replies 7 ·
High School Twin paradox with symmetric inertial motion and clock synchronization
- Phil42
- · Replies 14 ·
Graduate Model for Gravity -- What mechanism distorts space in the real case?
- talanum52
- · Replies 60 ·
Undergrad Is the instantaneous collapse of the wave function frame dependent?
- timmdeeg
- · Replies 9 ·
Undergrad 3+1 split of the Electromagnetic Tensor and Maxwell's Equations
- jv07cs
- · Replies 25 ·
Undergrad Calculation of Lie derivative - follow up
- cianfa72
- · Replies 27 ·
Undergrad Clock Synchronisation -- Do clock speeds go out of synch?
- Phil42
- · Replies 59 ·
Undergrad How Does Mass Loss from Black Hole Mergers Affect Orbits?
- tzimie
- · Replies 13 ·
High School Clock synchronising by clock transport?
- Peter Strohmayer
- · Replies 39 ·
Undergrad Variation of matter action under diffeomorphism (Carroll)
- chartery
- · Replies 4 ·
Undergrad Does SR Length Contraction Halve Space Travel Time?
- Chenkel
- · Replies 17 ·
Undergrad Numerical Relativity -- Software to solve the Einstein field equations?
- dsaun777
- · Replies 2 ·
Undergrad Black Holes in Curved Spacetime
- Vanadium 50
- · Replies 23 ·
Undergrad Is mass proportional to electromagnetic field energy in E=mc²?
- Bobski
- · Replies 8 ·
Undergrad Supermassive black hole, surface gravity and tidal forces
- haushofer
- · Replies 62 ·
Undergrad Spacecraft With Solar Mass Energy Equivalent Kinetic Energy
- Devin-M
- · Replies 79 ·
Undergrad Relativistic Lagrangian of a particle in EM field
- Hill
- · Replies 3 ·
High School Does shortness from length contraction have a real physical effect?
- syfry
- · Replies 12 ·
Undergrad Why does a dropped stone appear to fall in a parabolic curve to a stationary observer?
- nadja
- · Replies 10 ·
Undergrad Integral curves of (timelike) smooth vector field
- cianfa72
- · Replies 26 ·
Undergrad Wald synchronous reference frame proof
- cianfa72
- · Replies 27 ·
High School Where does spacetime go after falling into a gravity well?
- pforeman
- · Replies 12 ·
High School Changing frames in the twin paradox?
- anuttarasammyak
- · Replies 19 ·
Undergrad About global inertial frame in GR - revisited
- cianfa72
- · Replies 56 ·
High School Does a hot coffee have bigger mass than a cold coffee?
- Lotto
- · Replies 102 ·
High School What does the term "age" mean in descriptions of the twin paradox?
- Peter Strohmayer
- · Replies 7 ·
Undergrad Why Must Pure Force Depend on 4-Velocity?
- Sagittarius A-Star
- · Replies 47 ·
High School Any Feasible Faster-Than-Light Interstellar Travel?
- Ascendant0
- · Replies 4 ·
High School Redshift of a light pulse between 2 accelerating rockets
- sphyrch
- · Replies 3 ·
Undergrad Do any real macroscopic black holes have a singularity?
- Wo Wala Moiz
- · Replies 11 ·
Graduate Photon speed for an observer at the photon sphere
- alexriemann
- · Replies 3 ·
Undergrad Terrell rotation is confusing!
- Physicsperson123
- · Replies 8 ·
Undergrad SR textbooks covering accelerated reference frames without GR
- Logic314
- · Replies 36 ·
Undergrad Speed of Light Could be Reached and Indeed even Exceeded
- James1355
- · Replies 21 ·
High School Can a Gravitational System be Treated as a Single Curved Spacetime?
- BeedS
- · Replies 4 ·
Graduate Extra (boundary?) term in Brans Dicke field equations
- ergospherical
- · Replies 2 ·
Undergrad Congruent worldlines in "static" gravitational field
- Shirish
- · Replies 42 ·
Undergrad Curved spacetime and measurement direction
- Hill
- · Replies 1 ·
High School Relative rate of clock ticks on the radius of a rotating disc
- sphyrch
- · Replies 46 ·
Undergrad Minkowski metric and proper time interpretation
- msumm21
- · Replies 4 ·
Undergrad Why transverse lengths remain constant when a spacecraft changes frame
- Hak
- · Replies 21 ·
Undergrad Understanding Relativity of Simultaneity in Resnick, Part II
- zenterix
- · Replies 20 ·
Undergrad Smooth coordinate chart on spacetime manifold
- cianfa72
- · Replies 51 ·
Undergrad Reference systems and apparent counter-explanations on Twin Paradox
- Hak
- · Replies 5 ·
Undergrad Understanding Relativity of Simultaneity in Resnick, Part I
- zenterix
- · Replies 16 ·
High School How quickly does the Earth feel the effects of a halved Sun's mass?
- Hak
- · Replies 38 ·
Undergrad Is the Kroneker Delta Identity Used Correctly in this Paper?
- Safinaz
- · Replies 2 ·
Undergrad Paradox of the car and the driver in SR
- Hak
- · Replies 23 ·
Undergrad Can electromagnetic forces locally warp spacetime like gravity does?
- Hak
- · Replies 2 ·
Undergrad How Does Special Relativity Affect Perceptions of Simultaneity?
- Hak
- · Replies 32 ·
Undergrad How many meter sticks are there in this length contraction reasoning?
- zenterix
- · Replies 12 ·
High School What Is Relativity Theory in Simple Terms?
- Jpolisa
- · Replies 6 ·
High School Measuring the speed of light on moving systems
- CHAIM123
- · Replies 13 ·
Undergrad What causes the magnetic force in a uniform magnetic field?
- Hak
- · Replies 20 ·
Undergrad Can gravitational lensing detect Very small deviations in light propagation?
- Precious Adegbite
- · Replies 8 ·
Undergrad Can we choose different functional forms for Lorentz transformation?
- zenterix
- · Replies 10 ·
Undergrad ##x'=0## and ##t'=0## axes in railcar thought experiment
- zenterix
- · Replies 25 ·
Undergrad Are basic magnetic field equations first-order relativistic approximations?
- StoneHengeAlive
- · Replies 25 ·
Undergrad Ricci notations and visualisation
- chartery
- · Replies 10 ·
Undergrad Why Do Some Events in My Lorentz Transformation Appear Incorrect?
- Physicsperson123
- · Replies 16 ·
Undergrad Coulomb gauge Lorenz invariant?
- Sebas4
- · Replies 2 ·
Undergrad Question about gravity being a distortion of spacetime
- lordoftheselands
- · Replies 7 ·
High School Is the Speed of Light Consistent Across Rotating Reference Frames?
- phymath7
- · Replies 10 ·
Undergrad Integrate time dilation with derivative
- Franyer
- · Replies 1 ·
High School Does Time Move Slower for Travelers in Special Relativity Experiments?
- Hak
- · Replies 29 ·
High School Difference between special relativity and redshift?
- BadgerBadger92
- · Replies 11 ·
High School What is the general transformation formula for uniform proper acceleration?
- snoopies622
- · Replies 13 ·
Graduate How can I calculate the square of the Pauli-Lubanski pseudovector?
- tannhaus
- · Replies 1 ·
Undergrad Sagnac gyroscope affected by linear acceleration?
- KDP
- · Replies 19 ·
High School Cosmic expansion and shock waves
- Adel Makram
- · Replies 2 ·
Undergrad Non-commutativity of unit polar bases
- chartery
- · Replies 14 ·
Undergrad Recast of a conformal line element
- silverwhale
- · Replies 4 ·
High School Speed of separation of two masses
- bensabriK
- · Replies 16 ·
Undergrad Suggestion for 2 more GR tests
- DanMP
- · Replies 20 ·
Graduate Einstein's 1905 section 2: light speed in moving frames
- MNemteanu
- · Replies 35 ·
Undergrad When does a coordinate transformation eliminate a gravitational field?
- Shirish
- · Replies 40 ·
Undergrad Time intervals measured by stationary and moving observers
- Hak
- · Replies 43 ·
High School How do space and time fuse together to form “spacetime?”
- Wiredcerebellum
- · Replies 37 ·
High School A contradiction of the equivalence principle?
- jeff einstein
- · Replies 99 ·
Undergrad Solving for velocity from Minkowski diagram line equation
- Leepappas
- · Replies 14 ·
Undergrad Twin paradox, virtual clock on ship with Earth time, discontinuity
- LikenTs
- · Replies 115 ·
Undergrad How Can I Design an Experiment to Ensure Simultaneous Light Arrival?
- AlMetis
- · Replies 39 ·