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 The Paradox of Relativity Length Contraction
- alan123hk
- · Replies 166 ·
Undergrad Synchronous Frames/Coordinate Charts
- PeterDonis
- · Replies 14 ·
Undergrad Analyzing Dynamics in Constant Acceleration w/Rindler & Equivalence
- e2m2a
- · Replies 8 ·
Undergrad Can Thinking Fast Slow Down Time in Relativity?
- jaketodd
- · Replies 5 ·
Graduate Covariant Derivative of Stress Energy Tensor of Scalar Field on Shell
- thatboi
- · Replies 1 ·
Undergrad Coord. Time Vector Field: Schwarzschild vs Gullstrand-Painleve
- cianfa72
- · Replies 16 ·
Undergrad What is the angular velocity of a satellite?
- binis
- · Replies 132 ·
Undergrad Lorentz Transf. of Complex Null Tetrads: Formula (3.14-17)
- ergospherical
- · Replies 3 ·
Insights PF's policy on Lorentz Ether Theory and Block Universe - Comments
- Dale
- · Replies 61 ·
Undergrad Michelson & Morley in Space-Time Diagram: Can't Make it Work
- Trysse
- · Replies 18 ·
Undergrad How things appear to an accelerated observer
- Freixas
- · Replies 70 ·
Undergrad Linear Accelerator Length Contraction
- Orthoceras
- · Replies 1 ·
High School Harold White's Warp Drive Research: Casimir Effect Insight?
- Randy Subers
- · Replies 5 ·
High School Adorable Gravity Demo - National Medals Lab
- ergospherical
- · Replies 3 ·
Undergrad Gradient as vector vs differential one-form
- cianfa72
- · Replies 38 ·
Graduate Characterizing GR Traj in Minkowski Space
- sophiatev
- · Replies 17 ·
Undergrad Double Pulsar: 16 Year Study Validates Relativity
- fresh_42
- · Replies 0 ·
Undergrad Global simultaneity surfaces - how to adjust proper time?
- cianfa72
- · Replies 81 ·
Graduate General Relativity: Section 5.1 Homogeneity & Isotropy Analysis
- Alpha2021
- · Replies 7 ·
Undergrad SR "Paradox" Thread Continuation: Tilt of Plates & Simultaneity
- PAllen
- · Replies 4 ·
Graduate B and A in Curved Space Time: Does \nabla \times A =B?
- yourWitten
- · Replies 3 ·
High School Solving the twin paradox with special relativity
- alan123hk
- · Replies 37 ·
Undergrad Time Dilation at Moving Black Hole Event Horizon
- sha1000
- · Replies 16 ·
High School Explaining a Stronger Relativity Paradox than the Twin Paradox
- kvdr
- · Replies 15 ·
Undergrad LIGO: Detecting Differences Less Than a Proton Length - How is It Possible?
- thegroundhog
- · Replies 5 ·
High School Special Relativity & Lorentz Transformation Q: Clock C2 Reading?
- alan123hk
- · Replies 12 ·
Graduate Re-writing the geodesic deviation eqn in matrix notation (3d only)
- pervect
- · Replies 0 ·
High School What experiments confirmed the constant velocity of light?
- Grampa Dee
- · Replies 42 ·
Undergrad Can I get a clarification on my misunderstanding of SR?
- funnyman634
- · Replies 21 ·
Undergrad Equations Using Comma-Goto-Semicolon Rule in Curved Spacetime
- Haorong Wu
- · Replies 2 ·
High School Einstein's train-lightning scenario doesn't demonstrate relativity
- Peter Martin
- · Replies 52 ·
Graduate Einbein as Lagrange Multiplier: How Does it Work?
- ergospherical
- · Replies 3 ·
Undergrad Does light escape the Universe?
- swankdave
- · Replies 1 ·
Graduate Differential equation for affine parameter
- stevendaryl
- · Replies 28 ·
Undergrad Kerr Metric Bibliography: Resources for Timelike Geodesics
- CanoJones
- · Replies 2 ·
High School Calculating Energy Loss of Muon Moving Through a Medium
- Andreas S-H
- · Replies 27 ·
Graduate Energy, mass and Noether’s theorem
- md2perpe
- · Replies 74 ·
Undergrad Are Geometric Points Affected By Forces?
- JDoolin
- · Replies 3 ·
Undergrad Time Dilation vs. Doppler Effect: Similarities & Differences
- BadgerBadger92
- · Replies 4 ·
Undergrad Is movement really relative or absolute?
- only1god
- · Replies 13 ·
Undergrad Do Photons Attract Each Other?
- ergospherical
- · Replies 7 ·
High School The Mini Rocket Experiment: A Test of Einstein's Equivalence Principle?
- only1god
- · Replies 52 ·
High School Spatial curvature around a spherically symmetric mass
- J O Linton
- · Replies 39 ·
Undergrad Piecewise Functions in the Einstein Field Equations
- Sciencemaster
- · Replies 57 ·
Undergrad Sufficient Conditions for Strong Cosmic Censorship
- ergospherical
- · Replies 4 ·
Undergrad Can Placing Earth Between 3 Black Holes Slow Down Time?
- Joe Bond
- · Replies 5 ·
Undergrad Simplification of Dark Matter effects
- MadDog66
- · Replies 12 ·
Graduate Einstein Field Equations: Spherical Symmetry Solution
- PAllen
- · Replies 10 ·
Undergrad What if Einstein equivalence principle is proven wrong one day?
- only1god
- · Replies 50 ·
High School Time Travel: Is It a Meaningless Concept?
- MikeeMiracle
- · Replies 12 ·
Undergrad Comparing Spacetime and Thermodynamic State Space Manifolds
- cianfa72
- · Replies 16 ·
High School General Relativity as a Challenge for Physics Education
- robphy
- · Replies 15 ·
Undergrad Reference frame vs coordinate system
- lriuui0x0
- · Replies 34 ·
Undergrad On the gravitational collapse of a massive shell
- Mattergauge
- · Replies 45 ·
Undergrad If one of the dimensions of our solar system contracted ....
- student34
- · Replies 8 ·
Graduate Flat Embedding of Our Universe: Questions & Answers
- gerald V
- · Replies 5 ·
Undergrad Do we know how many meters long one second is?
- student34
- · Replies 4 ·
Undergrad What happens to time on the hands of a clock?
- Mattergauge
- · Replies 9 ·
High School Special Relativity and Light -- How does speed of an object affect time?
- BadgerBadger92
- · Replies 35 ·
Undergrad Understanding Special Relativity and Coordinates
- lriuui0x0
- · Replies 4 ·
Undergrad Do Physicists Literally Believe We Move Through Time?
- Trysse
- · Replies 21 ·
Undergrad Universal Block Theory: Free Will
- Sciencelad2798
- · Replies 20 ·
High School Proving Special Relativity w/ Standard Equipment
- Andreas S-H
- · Replies 24 ·
High School Confused about time dilation and cosmic speed limit
- Sciencelad2798
- · Replies 5 ·
Graduate Sign of Curvature in Flamm's Paraboloid: Negative?
- pervect
- · Replies 8 ·
High School One way speed of light in one reference frame measurement
- Point Conception
- · Replies 5 ·
Graduate Question on Equation in Zee's Gravity in a Nutshell P107
- vaatmoly
- · Replies 3 ·
High School Finding One-Way Speed of Light: Use One Clock
- TylerSmith
- · Replies 14 ·
Undergrad Could Tachyons Discredit Relativity?
- BadgerBadger92
- · Replies 7 ·
High School Black Holes: Can Anything Reduce Their Size?
- elusiveshame
- · Replies 7 ·
Undergrad Lorentz Invariance of Q in Weinberg: Justifying Transformation
- ergospherical
- · Replies 9 ·
Graduate Unruh & Minkowski Modes: Analytic Extension Explained
- KDPhysics
- · Replies 6 ·
Undergrad Gravity: Force or Acceleration?
- Schnellmann
- · Replies 69 ·
Graduate Is gravity simply an interaction in the gauge theory of gravity?
- vanhees71
- · Replies 50 ·
Graduate Prove Fermi-Walker Transport of Gyroscope's Spin Vector w/No Applied Moment
- ergospherical
- · Replies 10 ·
Undergrad Normalization Constant in Einstein-Hilbert Action
- Haorong Wu
- · Replies 10 ·
Undergrad Falling into a Black Hole: Blueshift Questions Explored
- Grasshopper
- · Replies 11 ·
High School FAQs about Bobrick & Martire's Warp Drive & Lentz's Paper
- rgtr
- · Replies 11 ·
Undergrad Do Fictitious Forces Still Matter in General Relativity?
- zoltrix
- · Replies 21 ·
Undergrad Linearized Gravity & Metric Perturbation when Indices Raised
- George Keeling
- · Replies 17 ·
Undergrad Variation of Four-Velocity Vector w/ Respect to Metric Tensor
- Hubble_92
- · Replies 2 ·
Graduate Merger of Extremal BHs Causes Naked Singularity?
- arusse02
- · Replies 3 ·
Graduate Tony Rothman Questions E=mc^2 in American Scientist
- mathman
- · Replies 13 ·
High School Paradox in the block universe interpretation
- Buckethead
- · Replies 57 ·
High School Time Dilation: How Does Speed Affect Aging?
- Tristan1607
- · Replies 10 ·
High School I have a few questions about Warp drives? I am a layman.
- rgtr
- · Replies 4 ·
High School Understanding Entangled Particles in Different Time Frames
- BillTre
- · Replies 3 ·
Undergrad Black hole inside of a black hole.... can it be done?
- Grasshopper
- · Replies 114 ·
Undergrad Clarification on Rindler coordinates definition
- cianfa72
- · Replies 16 ·
Undergrad The Universe filled with a "homogeneous perfect fluid"
- MathematicalPhysicist
- · Replies 30 ·
High School Do black holes determine time's arrow?
- shlosmem
- · Replies 124 ·
Undergrad A problem with the solution to the ladder paradox
- student34
- · Replies 15 ·
High School Basic introduction to gravitation as curved spacetime
- cianfa72
- · Replies 57 ·
Undergrad Is the sign of the Einstein equation right in Chandrasekhar's Black holes?
- timeant
- · Replies 13 ·
High School Can we see matter crossing the Event Horizon with a powerful telescope?
- wsullivan
- · Replies 21 ·
Undergrad Assumption in the derivation of the Lorentz transformation
- Kyouran
- · Replies 33 ·
High School Gravitons: Relationship to Space-Time & Black Holes
- Kairos
- · Replies 4 ·
High School Is length contraction (Lorentz transformation) an illusion or real?
- student34
- · Replies 24 ·
Undergrad Understanding Jacobian Matrix Transformation in Special Relativity
- Harry Case
- · Replies 8 ·
Undergrad Definition of Rindler Horizon: A Global View
- PAllen
- · Replies 10 ·