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 Contracting the stress energy tensor
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Graduate Oppenheimer-Snyder Model of Gravitational Collapse: Mathematical Details
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Undergrad Gravitation Machine Invented? Research Idea
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Graduate Do Astrophysical Black Holes Contain CTCs?
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High School Speed of Light Unaffected by Moving Emitter
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Undergrad How do angular displacement and rapidity relate in special relativity?
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Undergrad Time Dilation & Aging: Why Do Astronauts Age More Slowly in Space?
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Undergrad How can time only have one direction?
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Insights Oppenheimer-Snyder Model: Overview of Gravitational Collapse
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Graduate Static Gravitational Field: Why Must ##g_{m0} = 0##?
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High School Can there be time without mass?
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High School What if a needle hits Jupiter at nearly speed of light?
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Undergrad From Einstein Summation to Matrix Notation: Why?
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Undergrad Calculate Length Contraction for Accelerated Motion to Proxima Centauri
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High School My paraphrased explanation of the Twin Paradox
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Undergrad SR vs GR: Logical Necessity of Signal Propagation
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Graduate Two Questions about Novikov Coordinates
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Undergrad Arguments leading to the speed of light as a dimensionless constant
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High School Eddington Exp vs Newton: Comparing Starlight Deflection
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Undergrad Best Derivation of E=mc^2 - Fdx = V^2 dm
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High School The One-Way Speed of Light: Speculation of a Tired Mind
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Undergrad Need to resort to spherical wavefront to derive the LTs?
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Undergrad Charge conservation and special relativity
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High School Could Traveling at Near-Light Speed Create Black Holes?
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Graduate Decomposing Rank-2 Tensors in Dirac's "General Theory of Relativity
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Graduate Differential Forms Integration Exercise
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Undergrad Doppler Shift & Christoffel Symbols Issues
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High School Deep Space Speed Limit: What Prevents Exceeding Light Speed?
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High School Relativistic Velocity Addition: Is c Ever Exceeded?
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Undergrad Einstein's General Relativity w/o Cosmological Constant
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Graduate Principal Invariants of the Weyl Tensor
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Undergrad Gravitational Waves from Vanishing Sun: What Happens?
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Graduate Exploring "The Mathematical Theory of Black Holes" by S. Chandrasekhar
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High School Calculate Red Shift w/ Shwarzschild Metric: A Hypothetical Black Hole Any Size?
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Undergrad Understanding Admit & Adapt: Timelike Killing Vector Field
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High School Time dilation - what is the time on the Earth?
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Graduate Visualizing Arbitrary Coordinate System - Example Needed
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Undergrad Twin Paradox: Calculating Stan's Time Elapsed According to Moe
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High School What is x' for Moving Rocket from P?
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Undergrad Magnetic Field vs Spacetime: Effects on Inertia Disk
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Undergrad Jefimenko's Theory of Gravitation: Continued Discussion
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Undergrad Time-Like Events: Spatial Order Not Relevant?
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Undergrad Is this just a typo in Schutz' book on General Relativity?
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High School Is a Universe Without Mass and Energy Possible?
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High School Solve General Geodesics in FLRW Metric w/ Conformal Coordinates
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Undergrad Metrics of GR Solutions: Comp List, Hist & Viability
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High School Calculate Unit Normal Vector for Metric Tensor
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High School A question about relativity of simultaneity
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High School How much time passes on Earth?
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Undergrad Linearized Gravity: Bimetric Theory of General Relativity?
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High School Calc. Christoffel Symbols of Hiscock Coordinates
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Undergrad Can Spherical Symmetry Be Achieved Without Varying Line Element?
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Undergrad How is photon momentum compatible with special relativity?
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High School Understanding twin paradox without math
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High School Speed of Point on Expanding Sphere
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Graduate Propagation Vector of Light in Kerr Spacetime: Reference Needed
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High School Distance b/w 2 Points on Spacetime Diagrams: Meaning?
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Undergrad Do AEST (Absolute Euclidean Spacetime) models work?
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Undergrad Hawking Radiation Extrapolation: A Conjecture
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Undergrad Hawking Radiation: Can Particles Appear with Relativistic Velocities?
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Graduate Time Travel, General Relativity & Information Paradoxes
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Undergrad Time Dilation & Length Contraction: Graphically Explained
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High School Doppler Shifting of Light: Simplification or Reality?
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Undergrad Time Dilation in Gravitational Field: Potential vs Field Strength
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Undergrad Observing a Collapsing Shell: Time Dilation Explained
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High School Principle of Relativity: Classical Physics Example
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High School Metric Line Element Use: Do's & Don'ts for Accelerated Dummies?
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High School Gravity Between Two Stars 45 Billion Light Years Away?
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Undergrad Time Dilation for Photons: Explained
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Undergrad Cosmic Test Reveals Odd Findings for Einstein's Relativity
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Undergrad Twin Paradox with accelerated Motion
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High School How Did Einstein's E=mc² Transform Our Understanding of Inertia and Gravity?
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Undergrad Twin paradox for (accelerated) dummies?
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Undergrad Calculating Spacetime Around Multiple Objects
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High School Muon Tomography Evidence for Special Relativity?
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Graduate Why is Tau-AB^2 not t^2 + x^2?
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Undergrad Anti-symmetric part of an equation
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Undergrad What Is the Proper Time in Curved Space?
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Undergrad Michelson–Morley experiment and the velocity of the ether wind
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High School Time Shift Reference Point: Earth or Other?
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Undergrad Create movement from leveraging the propagation of magmatism
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Undergrad Lorentz Contraction & Twin Paradox
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Undergrad Einstein's Derivation of Elapsed Time for Remote Comoving Object
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High School Where am I wrong in this travelling faster than light Idea I've had?
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Undergrad Faster-than-Light Causality-Flip: Thought Experiment Reference?
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High School Can there be causality when there is spacelike separation?
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Undergrad The Christoffel symbols at the origin -- Why zero?
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Undergrad What is Spacelike vs. Timelike Coordinate?
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Undergrad The invariance of the speed of light is not only a hypothesis?
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Undergrad Twin Paradox with radioactive twins
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High School GTR Vacuum vs Quantum Theory Vacuum: Speed of Light
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High School Speed of Light in Free Space - Einstein's Second Principle
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High School Mass & Weight Impact on Spiraling Into a Black Hole
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Undergrad Relativistic length contraction
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Undergrad Instantaneous coordinates of an event in space (special relativity)
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Undergrad Geodesic in Weak Field Limit: Introducing Einstein's Relativity
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Undergrad Resolving the Twin Paradox: Non-Straight Paths and Proper Time in Space-Time
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Undergrad Understanding Three Force: Definition and Application
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Undergrad Bending of Light Along the Sun: Explaining Half w/ Equivalence Principle
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Undergrad What's the definition of angle in a curved space embedded in a higher Eucledian space?
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