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.
I Orbital Precession Calculation: Unit Explained
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I Can Vacuum Energy Alter Our Understanding of Gravity?
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B Proposed Experiment - Speed of Light
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A Popular Pseudoscience Video on General Relativity: Analysis & Criticism
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A Can an Oscillating Eternal Universe be Described without Singularity?
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A Cosmological Density Perturbation vs Homogeneity: Questions Answered
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B Spaghettification & Black Holes: Classical & Einsteinian
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B Does General Relativity Really Support Nonlocality?
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B Questions about the Speed of Light, Time, etc.
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I Proof of Lorentz Gauge Existence: Help Understanding Schutz 8.3
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I Modeling the Earth and Sun (2 body orbits) using general relativity?
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A Small and large extra dimension(s) of the physical space
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B Calc Excess Rad on Earth in Curved 3D Space | Feynman Lectures 6-2
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I Does Special Relativity Change Our Perception of Others?
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I Conservation of Energy in GR: A-B System Analysis
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B Time Travel: Can Humans Go Faster Than Ordinary Speed?
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Insights Oppenheimer-Snyder Model of Gravitational Collapse: Implications
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B Derivation of time dilation without light clocks
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I Muon Decay Example from Morin's Book: Issues Explained
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I Gravity of the Sun: Einstein's Calculation and Beyond
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I Why Are the Two Diagrams in the Twin Paradox Not Symmetric?
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B Relativity & Gravity: Resolving the Discrepancy
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A Two degrees of freedom in GR after boundary conditions specified?
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I Train Simulation: Observer A and B Contradiction?
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B Light Speed In Forward and Backward Directions
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I Visualising Torsion Tensor: Is There a Picture?
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I Special Relativity philosophy and anxiety
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I Physics Error in Larry Niven's "Neutron Star
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B Can Matter Enter a Black Hole Intact? Debate & Advice
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I Contracting the stress energy tensor
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Oppenheimer-Snyder Model of Gravitational Collapse: Mathematical Details
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I Gravitation Machine Invented? Research Idea
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A Do Astrophysical Black Holes Contain CTCs?
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B Speed of Light Unaffected by Moving Emitter
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I How do angular displacement and rapidity relate in special relativity?
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I Time Dilation & Aging: Why Do Astronauts Age More Slowly in Space?
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I How can time only have one direction?
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Insights Oppenheimer-Snyder Model: Overview of Gravitational Collapse
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A Static Gravitational Field: Why Must ##g_{m0} = 0##?
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B Can there be time without mass?
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I From Einstein Summation to Matrix Notation: Why?
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I Calculate Length Contraction for Accelerated Motion to Proxima Centauri
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B My paraphrased explanation of the Twin Paradox
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I SR vs GR: Logical Necessity of Signal Propagation
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A Two Questions about Novikov Coordinates
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I Arguments leading to the speed of light as a dimensionless constant
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B Eddington Exp vs Newton: Comparing Starlight Deflection
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I Best Derivation of E=mc^2 - Fdx = V^2 dm
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B The One-Way Speed of Light: Speculation of a Tired Mind
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I Need to resort to spherical wavefront to derive the LTs?
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I Charge conservation and special relativity
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B Could Traveling at Near-Light Speed Create Black Holes?
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A Decomposing Rank-2 Tensors in Dirac's "General Theory of Relativity
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Differential Forms Integration Exercise
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I Doppler Shift & Christoffel Symbols Issues
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B Deep Space Speed Limit: What Prevents Exceeding Light Speed?
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B Relativistic Velocity Addition: Is c Ever Exceeded?
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I Einstein's General Relativity w/o Cosmological Constant
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A Principal Invariants of the Weyl Tensor
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I Gravitational Waves from Vanishing Sun: What Happens?
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Exploring "The Mathematical Theory of Black Holes" by S. Chandrasekhar
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B Calculate Red Shift w/ Shwarzschild Metric: A Hypothetical Black Hole Any Size?
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I Understanding Admit & Adapt: Timelike Killing Vector Field
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B Time dilation - what is the time on the Earth?
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A Visualizing Arbitrary Coordinate System - Example Needed
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I Twin Paradox: Calculating Stan's Time Elapsed According to Moe
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B What is x' for Moving Rocket from P?
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I Magnetic Field vs Spacetime: Effects on Inertia Disk
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I Jefimenko's Theory of Gravitation: Continued Discussion
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I Time-Like Events: Spatial Order Not Relevant?
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I Is this just a typo in Schutz' book on General Relativity?
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B Is a Universe Without Mass and Energy Possible?
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B Solve General Geodesics in FLRW Metric w/ Conformal Coordinates
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I Metrics of GR Solutions: Comp List, Hist & Viability
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B Calculate Unit Normal Vector for Metric Tensor
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B A question about relativity of simultaneity
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B How much time passes on Earth?
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I Linearized Gravity: Bimetric Theory of General Relativity?
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B Calc. Christoffel Symbols of Hiscock Coordinates
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I Can Spherical Symmetry Be Achieved Without Varying Line Element?
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I How is photon momentum compatible with special relativity?
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B Understanding twin paradox without math
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B Speed of Point on Expanding Sphere
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A Propagation Vector of Light in Kerr Spacetime: Reference Needed
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B Distance b/w 2 Points on Spacetime Diagrams: Meaning?
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I Do AEST (Absolute Euclidean Spacetime) models work?
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I Hawking Radiation Extrapolation: A Conjecture
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I Hawking Radiation: Can Particles Appear with Relativistic Velocities?
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A Time Travel, General Relativity & Information Paradoxes
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I Time Dilation & Length Contraction: Graphically Explained
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B Doppler Shifting of Light: Simplification or Reality?
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I Time Dilation in Gravitational Field: Potential vs Field Strength
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I Observing a Collapsing Shell: Time Dilation Explained
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B Principle of Relativity: Classical Physics Example
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B Metric Line Element Use: Do's & Don'ts for Accelerated Dummies?
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B Gravity Between Two Stars 45 Billion Light Years Away?
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I Time Dilation for Photons: Explained
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I Cosmic Test Reveals Odd Findings for Einstein's Relativity
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I Twin Paradox with accelerated Motion
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B How Did Einstein's E=mc² Transform Our Understanding of Inertia and Gravity?
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