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.
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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Undergrad Newton's Gravity & Lorentz Contraction: Is Modification Needed?
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Undergrad An issue with length contraction
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Undergrad Solving for Extrema of Proper Time Integral
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Undergrad Black hole horizon for different observers
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Undergrad Can Curves Live Out of Embedding Diagrams?
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High School Grandfather Paradox & Self Consistency Principle: Are They Different?
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Undergrad Coordinate and time transformations
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Undergrad Theory Without Spacelike Separations: Can It Exist?
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High School Time Dilation & Bosons: Decay Rate Changes?
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Undergrad Does light take longer to go a set distance on a train?
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Undergrad Force due to acceleration and time flowing differently
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Graduate Is it possible for variable speed of light in a vacuum?
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Undergrad Some thoughts about Bell's string paradox alternatives
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Undergrad Understand 4-Vectors & Spacetime: Hartle Gravity Chapter 5
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Undergrad Beginner's Guide to GR: Questions & Answers
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Undergrad Connection & Affine Geodesics: Q&A
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Undergrad Time difference caused by length contraction
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Undergrad Geometries from Line Element $$dl^2=d\theta^2 + \sin^2\theta\, d\varphi^2$$
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Undergrad Calculation of gravitational redshift in an accelerating elevator
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Undergrad Tipler 1976: Clarifying Symbol Meaning
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Undergrad Can we determine the one way speed of light by combined measurements?
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Undergrad Measuring Time & Spatial Distances: Timelike vs Spacelike
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High School Problem about postulate of the invariance of the speed of light
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Undergrad What Would it Look Like to Fall into a Black Hole?
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Graduate Potential Energy of Relativistic Particles in Coulomb Field
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Undergrad Coordinate System Transformation: Lowering/Raising Indices Explained
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Undergrad When and how can I apply Born rigidity condition?
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Undergrad What is the definition of proper time interval according to Wikipedia?
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