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 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 Light Speed in Vacuum: Does It Reach Cosmic Limit?
- Sundown444
- · Replies 12 ·
High School Constant Speed of Light: Low Speed Explained
- grounded
- · Replies 18 ·
High School Experience Travel on a Photon: Hitch-Hiker's Guide to the Universe
- Karl24
- · Replies 7 ·
High School Can We "See" Effect Before Its Cause?
- silverrahul
- · Replies 11 ·
High School Time and Space Distortions of Photons: What Am I Misunderstanding?
- 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 Time Dilation: 2 Clocks in Same Ref Frame?
- maxpower2020
- · Replies 11 ·
Undergrad Essential Math Topics for GR: Semi-Riemannian Geometry (Newman)
- Shirish
- · Replies 8 ·
Undergrad Atomic Clock Exp on Ballistic Flight: Proving Clocks are Accelerometers
- dom_quixote
- · Replies 27 ·
Undergrad Measuring Light Reflection in 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 Help Me Determine Validity of Time Dilation Formula
- diazdaiz
- · Replies 24 ·
Graduate Max Force Debate: 2 vs. 3 Papers in Favor/Against
- 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 Is Erik's Paradox Challenging Our Understanding of Gravity and 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 Learn Physics with Eigenchris: Relativity & Tensors
- 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 Finding Event Horizon & Ergosphere: Derivations & Formulas
- user1139
- · Replies 9 ·
Undergrad Finding Riemann Components: Packages & Solutions
- 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 - Comments
- PeterDonis
- · Replies 39 ·
Undergrad Gravitational force equation derived from GR
- sha1000
- · Replies 36 ·
Insights The Schwarzschild Geometry: Part 1 - Comments
- PeterDonis
- · Replies 26 ·
Graduate Dustball Collapse & Evaporation: No Black Hole Singularity
- OJ Bernander
- · Replies 9 ·
Undergrad Schwarzschild Radius vs Event Horizon: Black Hole?
- Albertgauss
- · Replies 30 ·
Undergrad Clock synchronization for ring-riding observers on rotating disk
- cianfa72
- · Replies 63 ·
Undergrad Black Hole Waterfall Analogy & Light Speed
- 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 "Course on Relativity" Videos | YouTube Playlists
- 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 & Cosmology" Course on YouTube
- robphy
- · Replies 1 ·
Undergrad Calculate Ricci Scalar & Cosm. Const of AdS-Schwarzschild Metric in d-Dimensions
- shinobi20
- · Replies 1 ·
Undergrad Help Deriving Geodesic Equation from David Tong Notes
- Hamiltonian
- · Replies 18 ·
Graduate Time Dilation in Reissner-Nordström Metric: Even or Odd?
- H_A_Landman
- · Replies 16 ·
Undergrad Raising/Lowering Indices w/ Metric Tensor
- cianfa72
- · Replies 8 ·
High School Why is Light Speed Invariant & Finite?
- alan123hk
- · Replies 1 ·
High School Why is the speed of light a constant?
- Mohika
- · Replies 34 ·
Graduate Teaching SR without simultaneity
- Orodruin
- · Replies 89 ·
High School Clock Ticking in Gravitational Well: Observation Rate
- 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 Relativity of simultaneity doubt
- 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 Measuring Light Velocity Correctly: Thought Experiment
- Magatron
- · Replies 28 ·
High School Gravitational Orbits: How the Earth Knows Where to Go
- 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 Time & Gravity in Rotating Faster Than Light?
- deedee6905
- · Replies 8 ·
Undergrad Light Speed in Dense Medium: Explained
- 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 ·
High School Pendulum Clock vs GR: Time Discrepancy
- Patsy Hasty
- · Replies 7 ·
High School Could There Be a Cosmic Speed Limit Higher Than the Speed of Light?
- geordief
- · Replies 7 ·
High School Measuring Light's Brightness & Power Flux Relative to Observer's Speed
- alan123hk
- · Replies 4 ·
Undergrad Minkowski Spacetime KVF Symmetries
- cianfa72
- · Replies 32 ·
Undergrad Ex. 19 Gauge Fields, Knots & Gravity: Is Rotation Correct?
- ergospherical
- · Replies 4 ·
Undergrad Yang-Mills Stress-Energy Tensor Explained
- ergospherical
- · Replies 4 ·
Undergrad Space/Spacetime Metrics: Comparing Routes in PHY 101
- robphy
- · Replies 13 ·
Undergrad Relative Simultaneity: Comparing 2 Incompatible Calculation Methods
- Marilyn67
- · Replies 12 ·
Undergrad Judge Original Time & Length Special Relativity
- Barry Z
- · Replies 8 ·
Undergrad Because of length contraction, does absolute position exist?
- student34
- · Replies 88 ·
High School What is a suitable term for relativistic length in STEM education?
- hutchphd
- · Replies 6 ·
Graduate Massless Particle Action under Conformal Killing Vector Transformation
- ergospherical
- · Replies 9 ·