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 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 Does observer speed affect measured brightness and power flux of light?
- 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 Trace notation in the Yang-Mills stress-energy tensor
- ergospherical
- · Replies 4 ·
Undergrad Metrics and geodesics in Galilean versus Minkowski geometry
- robphy
- · Replies 13 ·
Undergrad Why do two methods for relative simultaneity give different results?
- Marilyn67
- · Replies 12 ·
Undergrad How do you find original time and length in 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 ·
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 Why don't light paths return simultaneously in Michelson-Morley space-time diagram?
- 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 How does the Riemann tensor simplify from isotropy in Wald section 5.1?
- Alpha2021
- · Replies 7 ·
Undergrad How relativity of simultaneity resolves the plate tilt paradox
- 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 Why do three observers disagree on which plate breaks?
- 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 Why does my light clock example give time dilation of 0.5s instead of 0.866s?
- 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 Does time dilation relate to the Doppler effect?
- BadgerBadger92
- · Replies 4 ·
Undergrad Is movement really relative or absolute?
- only1god
- · Replies 13 ·
Undergrad Do Photons Attract Each Other?
- ergospherical
- · Replies 7 ·
High School Does a mini rocket in free fall need more fuel than in space?
- 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 Is time travel meaningless without absolute time?
- MikeeMiracle
- · Replies 12 ·
Undergrad Intrinsic vs extrinsic geometry of spacetime and thermodynamic 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 Would a length-contracted solar system behave identically to the original?
- student34
- · Replies 8 ·
Graduate How many flat dimensions does our universe need as an embedding?
- 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 Does free will exist?
- Sciencelad2798
- · Replies 20 ·
High School Proving Special Relativity w/ Standard Equipment
- Andreas S-H
- · Replies 24 ·
High School Does time dilation have a logical explanation?
- 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 Measuring one-way light speed with a single clock and sound synchronization
- 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 Why are analytically extended Rindler modes positive-frequency only?
- KDPhysics
- · Replies 6 ·
Undergrad Is gravity a force or spacetime curvature?
- 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 Does light blueshift dangerously for observers falling into a black hole?
- Grasshopper
- · Replies 11 ·
High School Warp drive energy, shielding, and faster-than-light travel in Bobrick and Lentz models
- rgtr
- · Replies 11 ·
Undergrad Do Fictitious Forces Still Matter in General Relativity?
- zoltrix
- · Replies 21 ·
Undergrad Why does raising indices on h_μν give a minus sign in linearized gravity?
- 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 Why does traveling at high speed slow aging relative to Earth?
- 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 Can matter form a black hole while falling toward a singularity?
- Grasshopper
- · Replies 114 ·