Special and General Relativity Forum

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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.
Undergrad Can Maxwell's Equations Explain Gravitation Through Retarded Wave Solutions?
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Graduate Schwarzschild Geometry: Evaluating Proper Distance
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High School Orthogonality in Minkowski Spacetime: Meaning & Visualization
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Undergrad Co-Moving Coordinates & Lapse Function N(t) in ADM Decomposition
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Undergrad Will a spherical mass be set in motion by a spherical shell rotating around it?
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High School Proving Reciprocity Of Time Dilation
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Undergrad Applying Velocity Addition in Rotating Frame: Is It Correct?
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Undergrad Shape Dynamics: How Can It Offer Same Predictions as GR & SR?
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Undergrad Questions concerning the geometry of spacetime
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High School Can Black Hole Gravity Be Overpowered?
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Undergrad Relativistic Velocity Addition: Calculating Electron Speed
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Undergrad Does the Light's One/Two-Way Speed Distinction Mean Anything?
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Undergrad Calculate Eigenvalues of Electromagnetic & Stress-Energy Tensors
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Graduate Worked examples Cartan Formalism
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Graduate Relativistic Hydrodynamics Eqn for Perfect Fluid: Insight Needed
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Undergrad Why am I getting the wrong conclusion from my spacetime diagram?
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Undergrad Instrument Size & Wavelength: What's the Relationship?
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Undergrad Raising & Lowering Indices: Q&A on Relativity
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High School Can a Planet Made of Glass Generate Free Energy?
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Undergrad Potential Energy in Wormholes: Charged Particles & Electric Fields
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High School Sagnac effect for matter beams
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Undergrad Is the Killer Crate Paradox Resolved?
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Undergrad Doppler Analysis of Twin Experiment: Valid Argument?
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Undergrad How Can Outward Normal Vector Point Inwards?
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Undergrad Einstein Definition of Simultaneity for Langevin Observers
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Undergrad Infinite Frequencies & Extraterrestrial Signals: What Are We Missing?
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Undergrad The Units of the Cosmological Constant: eV^2
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Undergrad Simulating GR: Worth the Effort?
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Undergrad Fermi-Walker Transport: History & 1932 Paper
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High School Time Dilation & Muon De Broglie Wavelength: Explained
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High School What Does Hawking Mean by Negative Energy at the Big Bang?
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High School Parallel light reflection for a one-way speed of light measurement setup
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Undergrad Kronecker Delta: Order of Indices Explained
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High School Travel 7 Light Years at 50000km/s - How Long?
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Undergrad Is Time Dilation Just a Misunderstanding of Clock Errors?
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High School Time Dilation on Rotating Disk: Clocks on Disk Perspective
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High School General Relativity & Ether: Clarifying a Contradiction?
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Graduate Curvature & Connection Without Metric
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Undergrad Energy Density in E Field: Does it Contribute to Inertial Mass?
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Undergrad Physical meaning of a spacelike geodesic
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Graduate Can a conformal flat metric be curved?
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Undergrad Radiate Single Charged Particle: Free Fall in Black Hole?
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Undergrad Distance Contraction: Is D or D*sqrt(1-(v/c)^2) Traveled?
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Insights Rindler Motion in Special Relativity: Hyperbolic Trajectories - Comments
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Graduate Generalize Special Relativity for Flat Spacetime
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Undergrad Gravitoelectromagnetism: Why Equation Differs in Sources
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Graduate Affine Spaces and Vector Spaces
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High School Gravitational Time Dilation on Mountaintops: New Member Questions
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High School Length, Time, and Velocity -- Which are fundamental quantities?
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Undergrad Effects of Supermassive Black Hole Merger on Nearby Bodies
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Undergrad Is Acceleration an Invariant? (Taylor & Wheeler)
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Undergrad Cat Chasing Red Dot Faster Than c: Results & Analysis
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Undergrad Difference between proper time and coordinate time
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Undergrad Length contraction in General Relativity
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Graduate Wald's Abstract Index Notation: Explaining T^{acde}_b
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High School Why are gravitons needed to explain gravitational attraction?
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Undergrad Spacetime Curvature via Triangle
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Undergrad Defining the components of a metric
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High School Simple reasoning that the equivalence principle suggests curvature
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High School Build a Time Dilation Clock for 8th Grade Science Project
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Undergrad Wilbert Zweistein's Objection to Equivalence Principle
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Undergrad Index Gymnastics: Tensor Product of 4-Vectors & Tensors
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Undergrad Can a Basis Vector be Lightlike?
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Undergrad Can time run backwards in an accelerating frame?
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High School Ride Gravitational Waves to Increase Speed?
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Graduate Proving $g(u,v)≠0$ with Linear Independence
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High School Does this thought experiment show that Space must be curved?
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Undergrad Differences b/w Schwarzschild Radius & Event Horizon
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Undergrad Schwarzschild Metric & Particle Absorption
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Undergrad Rindler Wedge: Timelike or Spacelike? Intuition & Light Cone
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Undergrad Energy conditions and non-physical phenomena
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High School Black Hole Event Horizon: Atom Effects & Wave Detection
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High School Why is the BH Information Paradox Called a Paradox?
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Graduate Relation of Electromagnetic Field & Field Tensor
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High School How Can We Observe Black Holes Growing?
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Undergrad Is a Flat, Expanding Universe Compatible with GR and Newtonian Mechanics?
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High School Rotation of Galaxies: Mass vs Dark Matter?
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High School Gravity-like Force: Is Another Force Weaker Than Gravity?
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Graduate Comparing Gullstrand-Painleve & Lemaitre Coordinates
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Undergrad GR: Practical Problem Sets w/ Solutions
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Undergrad Is there really nothing faster than light?
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High School Energy Conservation w/ Charged Battery Time Travel
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Undergrad Black Hole: Knock on the horizon
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Undergrad What is the Meaning of Lagrangian in Special Relativity?
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Graduate Anti-self Dual Part (2,2) Riemann Curvature Tensor
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High School Gravitational Lensing: Magnification of Galaxies
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Undergrad Applying Reisenbach Transf. to EM Wave in Microwave Oven
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Undergrad How to Measure Speed of Light & Is It Constant?
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Undergrad Gravitomagnetic Experiment: Possibility & Calculations
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Undergrad Time Travel in Newtonian Spacetime: Is it Possible?
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Undergrad Comparing Clock Rates in Accelerated vs Constant Velocity Frames
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High School Can Accelerate at Constant g in Own FoR?
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Undergrad Ideal Fluids & General Relativity: Why Needed?
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High School Galilean vs Lorentz Transformations: Correct Understanding?
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Undergrad How Does Time Dilation Affect the Twin Paradox in Special Relativity?
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Undergrad Constant Velocity Motion in Relativity: Radiation Effects?
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Undergrad Isotropy of the speed of light
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Undergrad General Relativity: Is it Local?
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Undergrad Deriving Special Relativity from Particle Indistinguishability
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Undergrad Gravitational vs. Electromagnetic Waves: What's the Difference?
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