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
High School Can You Become a Black Hole from Approaching Light Speed?
- bbbl67
- · Replies 25 ·
Undergrad Why does proper time depend on velocity if it's invariant?
- e2m2a
- · Replies 32 ·
Graduate What is the Expression for the Waveform of an In-Spiralling Compact Binary?
- ergospherical
- · Replies 1 ·
Undergrad Can we compute volume from energy density and the stress-energy tensor?
- Tertius
- · Replies 8 ·
Undergrad Does an accelerometer reading 9.8 m/s² mean I'm in an accelerated frame?
- Aerodyn
- · Replies 10 ·
Undergrad Does Lorentz invariance imply Einstein's synchronization convention?
- cianfa72
- · Replies 32 ·
Insights General relativity view of gravity on Earth
- Dale
- · Replies 135 ·
Graduate Difference between A^μ_ν, A^μ_ν, and A^μ_ν tensor notation
- LagrangeEuler
- · Replies 6 ·
Undergrad Can Gravity Escape a Black Hole?
- Vandenburg
- · Replies 21 ·
Undergrad Why is proper time frame invariant if Lorentz transformations give different values?
- e2m2a
- · Replies 20 ·
Undergrad Is a Manifold with a Boundary Considered a True Manifold?
- Dale
- · Replies 202 ·
Undergrad Curved space and gravitational waves
- Nidhi1007
- · Replies 6 ·
Undergrad Klein Gordon Invariance in General Relativity
- phyz2
- · Replies 10 ·
Undergrad Definition of "Spatial X Direction" in Spacetime Context
- cianfa72
- · Replies 39 ·
Undergrad Cauchy Stress Tensor in Applied Strength of Materials
- dsaun777
- · Replies 2 ·
High School Traveling outside of the Earth's atmosphere
- sideshow
- · Replies 27 ·
Undergrad Question on the space shuttle Challenger experimentation, in 1985
- John SpaceY
- · Replies 2 ·
Undergrad Adapting Schwarzschild Metric for Nonzero Λ
- Sciencemaster
- · Replies 4 ·
Graduate Vec norm in polar coordinates differs from norm in Cartesian coordinates
- Emil_M
- · Replies 47 ·
High School Does light reach full speed in a partial vacuum?
- Sundown444
- · Replies 12 ·
High School Why is light always c even at low speeds?
- grounded
- · Replies 18 ·
High School What would a photon-riding observer experience of time and distance?
- Karl24
- · Replies 7 ·
High School Can We "See" Effect Before Its Cause?
- silverrahul
- · Replies 11 ·
High School Why do photons appear to move if time and space are contracted at light speed?
- Involute
- · Replies 6 ·
Undergrad Time Dilation along Multiple Axes
- Reinhardt Walzer
- · Replies 16 ·
Graduate Understand (k,l) Tensors in Gen. Relativity
- GeoffFB
- · Replies 7 ·
High School Would two clocks stay synchronized if one travels at high velocity?
- maxpower2020
- · Replies 11 ·
Undergrad Which chapters of Newman's Semi-Riemannian Geometry are essential for GR?
- Shirish
- · Replies 8 ·
Undergrad Are atomic clocks accelerometers? Testing with ballistic flight?
- dom_quixote
- · Replies 27 ·
Undergrad Last signal received by a falling probe near a black hole
- Mike S.
- · Replies 89 ·
Undergrad Is the Fizeau-Type Experiment Valid for Measuring the One-Way Speed of Light?
- lightarrow
- · Replies 4 ·
Insights Introducing Relativity on Rotated Graph Paper: A Graphical Motivation
- robphy
- · Replies 0 ·
Undergrad Spin (or not) of a Kerr Black Hole
- gerald V
- · Replies 9 ·
High School Is my spacetime velocity derivation of time dilation valid?
- diazdaiz
- · Replies 24 ·
Graduate Does a maximum force limit exist in general relativity?
- JohannesSK
- · Replies 28 ·
Undergrad In what formation does this simple block universe exist?
- student34
- · Replies 162 ·
Undergrad Lorentz transformation of the Gravitational constant
- Dilema
- · Replies 11 ·
High School Confusion in notation of Lorentz Transformations
- Hamiltonian
- · Replies 6 ·
Undergrad Simultaneity of accelerated clocks
- hutchphd
- · Replies 51 ·
Undergrad Can Hypothetical Velocities Exceed the Speed of Light?
- frost_zero
- · Replies 5 ·
Undergrad Precausality and continuity in 1-postulate derivations of SR
- Enrico
- · Replies 41 ·
Undergrad Why doesn't constant acceleration through spacetime eventually exceed light speed?
- ErikThePhysicist1
- · Replies 18 ·
High School Is the relativity of simultaneity more than just a fudge factor?
- mc Kravitz
- · Replies 21 ·
High School Is there a frame where you die before you are born?
- idea2000
- · Replies 2 ·
Undergrad Eigenchris relativity and tensor video playlists
- robphy
- · Replies 12 ·
Undergrad Is There Experimental Evidence That Contradicts Time Contraction Predictions?
- John SpaceY
- · Replies 5 ·
Graduate I can't verify a relationship between cofactor and determinant
- Kisok
- · Replies 6 ·
Graduate Derivation of Equation 26 in Bardeen's Four Laws of Black Hole Thermodynamics
- thatboi
- · Replies 1 ·
High School Black hole at the beginning of time
- Physics Slayer
- · Replies 62 ·
Undergrad Gamma - A Minkowski Spacetime Diagram Generator
- Freixas
- · Replies 5 ·
Graduate How do I calculate the event horizon and ergosphere of a Kerr metric?
- user1139
- · Replies 9 ·
Undergrad Computing Riemann tensor components for hypothetical spacetimes
- ergospherical
- · Replies 5 ·
Undergrad Links between the Lorentz equations and SR/GR
- John SpaceY
- · Replies 17 ·
High School Any plausible explanation for dynamical length contraction?
- alexandrinushka
- · Replies 83 ·
Insights The Schwarzschild Geometry: Part 3
- PeterDonis
- · Replies 39 ·
Undergrad Gravitational force equation derived from GR
- sha1000
- · Replies 36 ·
Insights The Schwarzschild geometry: part 1
- PeterDonis
- · Replies 26 ·
Graduate Dustball collapse with evaporation prevents singularity formation
- OJ Bernander
- · Replies 9 ·
Undergrad Are Schwarzschild radius and event horizon the same thing?
- Albertgauss
- · Replies 30 ·
Undergrad Clock synchronization for ring-riding observers on rotating disk
- cianfa72
- · Replies 63 ·
Undergrad Does the waterfall model imply light speed differs vertically on Earth?
- Rene Dekker
- · Replies 15 ·
High School What is dTau? The Role of dTau in Measuring Time on a Worldline
- sqljunkey
- · Replies 3 ·
Undergrad Special Relativity: Grokking for a Female Neurobiologist in her 60s
- Chava
- · Replies 7 ·
Undergrad Andrzej Dragan's relativity course videos and book
- robphy
- · Replies 12 ·
Insights How to Study Fermi-Walker Transport in Minkowski Spacetime
- PeterDonis
- · Replies 42 ·
High School Accurate Visualization of GR - Science Clic
- frost_zero
- · Replies 8 ·
Undergrad Index notation for inverse Lorentz transform
- poetryphysics
- · Replies 30 ·
Undergrad Ta-Pei Cheng's relativity and cosmology lectures on YouTube
- robphy
- · Replies 1 ·
Undergrad Ricci scalar and cosmological constant of AdS-Schwarzschild metric in d dimensions
- shinobi20
- · Replies 1 ·
Undergrad Why does the Lagrangian for a free particle include the metric tensor?
- Hamiltonian
- · Replies 18 ·
Graduate Why does time dilation in Reissner-Nordström metric depend on charge?
- H_A_Landman
- · Replies 16 ·
Undergrad Raising/Lowering Indices w/ Metric Tensor
- cianfa72
- · Replies 8 ·
High School Why must the speed limit be the same in all reference frames?
- alan123hk
- · Replies 1 ·
High School Is the speed of light constant throughout the galaxy?
- Mohika
- · Replies 34 ·
Graduate Teaching SR without simultaneity
- Orodruin
- · Replies 89 ·
High School What does a clock look like falling toward a massive object?
- sqljunkey
- · Replies 11 ·
High School How to derive the Lorentz transformation in the simplest way?
- alan123hk
- · Replies 17 ·
Undergrad Is there only one structure of the universe?
- student34
- · Replies 1 ·
High School Why is Lorentz Ether Theory Hard to Rule Out?
- alexandrinushka
- · Replies 15 ·
Undergrad The Good Guy Fluctuation: Is Sheldon's Second Line Making Sense?
- ergospherical
- · Replies 2 ·
High School Check my understanding of Time Dilation and Length Contraction
- guyvsdcsniper
- · Replies 11 ·
High School Listen to Record from Planet w/ Extreme Gravity
- anven
- · Replies 21 ·
Undergrad Why does light reach train observer sequentially if equidistant in train frame?
- lukka98
- · Replies 221 ·
Undergrad What would be the form of this world line?
- student34
- · Replies 85 ·
Undergrad What's the underlying frame of the Einstein's Field Equation?
- Pyter
- · Replies 186 ·
Undergrad Why Do Longer Wavelengths Go Slower in Glass?
- exmarine
- · Replies 9 ·
High School Does Relativistic Speed Affect Mechanical Watch Oscillation?
- Jurgen M
- · Replies 84 ·
Graduate Why is the Principle of Equivalence Necessary for GTR?
- e2m2a
- · Replies 9 ·
High School Why light appears faster than c when measured across frames
- Magatron
- · Replies 28 ·
High School How do gravitational orbits work if gravity propagates at light speed?
- InkTide
- · Replies 29 ·
Undergrad Kinematic Decomposition for "Rod and Hole" Relativity Paradox
- PeterDonis
- · Replies 78 ·
Graduate Can Einstein Tensor be the Product of Two 4-Vectors?
- empdee4
- · Replies 5 ·
Undergrad How do gravity and time work if rotation makes distant stars appear superluminal?
- deedee6905
- · Replies 8 ·
Undergrad Why doesn't light appear to slow down when observed from inside glass?
- deedee6905
- · Replies 1 ·
High School Is energy really not conserved in a constantly expanding Universe?
- Question69
- · Replies 7 ·
Undergrad Transform Coordinates for Torus Metric in Wald
- ergospherical
- · Replies 8 ·
Undergrad Unruh Effect (1+1)D: Understanding Equation 5.68
- thatboi
- · Replies 2 ·
Undergrad Show Maxwell's Eqns. on a Cauchy Surface (Wald Ch. 10 Pr.2)
- ergospherical
- · Replies 1 ·
Undergrad Quasi-Static Change of Event Horizon Area
- ergospherical
- · Replies 2 ·
Undergrad Determine Scaling Dimension of Field Theory
- ergospherical
- · Replies 3 ·