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.
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Graduate FAQ: Experimental Basis of Special Relativity
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Insights When Discussing the Twin Paradox: Read This First
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Insights Maxwell’s Equations in a Static, Spherically Symmetric Spacetime
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Insights An Introduction to the Generation of Mass from Energy
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Graduate Relativity Insights: FAQs on Photons, Gravity, Time Dilation, and More!
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High School A question about special relativity
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Undergrad Explanation requested for a relativistic scenario wherein two seemingly valid measurement procedures lead to different results for the same observable
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Graduate The Lagrangian of a free particle ##L=-m \, ds/dt##
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High School Do Dark Energy and the Casimir effect indicate Exotic Matter could exist?
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Undergrad Does the Alcubierre drive shorten distances?
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High School Calculating an impossible reference frame as my own homework problem
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High School Looking for an English translation of Levi-Civita's 1926 paper "Sur l'écart géodésique" ("On the geodesic deviation")
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Graduate Is the variation of the metric ##\delta g_{\mu\nu}## a tensor?
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High School Lorentz Transformation of Electric & Magnetic Fields Visualized
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Graduate How valid is the Block Universe theory?
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Undergrad Special Relativity in a closed universe
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Undergrad Why is the Lorentz Force always perpendicular to velocity?
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Undergrad Why is gravity a fictitious force?
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Undergrad Black hole questions
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Undergrad Relativistic Uniform Circular Motion
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Undergrad KE of rotating disc
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Help with problem in MIT open course general relativity
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Graduate Aether equal to spacetime?
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Undergrad Another Time Dilation Question
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Graduate Struct parallels between curvature behavior/abstract geometric cycles?
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Graduate Rotating Disk Method to Attain Light Speed?
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Graduate Feynman's bug (hot plate) in generality
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High School Rotating disc: tidal relativity across surface of disc
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Undergrad Differentiation of the connections
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Graduate Gravitational wave propagation in GR - follow up
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Undergrad Relativistic Space Travel: Optimizing Proper Time [Project Hail Mary]
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Graduate Topological constrains for the solutions of EFE
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Undergrad With gravitational lensing, which way is down?
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Graduate What Exactly Is The Physical Content Of Maxwell's Equations?
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Undergrad Relativity, time, and quantum mechanics
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Undergrad Raising and lowering indices using metric tensor
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Graduate About the definition of Born rigidity
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Undergrad Euclidean geometry and gravity
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Graduate Spacetime interval in Galilean relativity
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Undergrad EPR revisited
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Graduate Orbits of a photon that can't quite cross the photon sphere of a BH
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Undergrad Looking closely at the descent into a black hole
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Undergrad One way speed of light
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Undergrad The paradox of symmetrical time dilation
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Graduate Can a causal or time-like structure emerge without assuming a metric?
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Undergrad Why is ##(t_1'-t_2')^2## constant in proof(invariance of intervals)?
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Undergrad Ships passing each other at near light speed
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Graduate Does a truly static "Block Universe" allign with "experience" aspect?
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Graduate Regarding Relativity of Simultaneity, is non-local "now" impossible?
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Undergrad How many sorts of time are there in physics?
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Undergrad Einstein's time formula
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Graduate Stability of the Kerr–Newman black hole under small perturbations
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High School Light & Time
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Undergrad Photons & Time: t=0 What?
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High School Time travel without paradox
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Graduate Dirac's 1958 lecture on spinors
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Graduate Another derivation from Quantum Fields on curved spacetime
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Undergrad Why can coefficient "a" between spacetime intervals depend on velocity between systems?
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Undergrad Gravitational analog of electromagnetic force
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Undergrad Macroscopic objects in free-fall
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Undergrad Light clock treating horizontal and vertical motion differently?
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Undergrad Linear vs rotary motion
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High School True static equilibrium and effects on time
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High School Car spinning on a frictionless sheet of ice = absolute motion?
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High School Relativistic simultaneity and effects on time
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Undergrad Acceleration calculation in Special Relativity
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High School Need tips to understand Relativistic Energy in Special Relativity
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High School Why does a Wormhole not look like an hourglass?
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High School Traveling through space at zero km/s
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Graduate Kruskal Coordinates in Schwartzchild metric
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Undergrad Convention for writing $\binom{1}{1}$ tensors in matrix form?
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Undergrad Derive the Lorentz transformation in Minkowski four-dimensional spacetime spacetime
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Undergrad Relational event horizons?
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Graduate Stumped by a Lagrangian in Einstein's 1916 paper
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High School Am I understanding the concept of proper frame of reference?
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High School Why is the constant speed of light so unique?
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Undergrad Synchronizing clocks in an inertial frame if light is anisotropic
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High School Why Do Events Freeze For Me at the Speed of Light?
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Undergrad Revisiting the Light Clock
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Undergrad Question about Parallel Transport
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High School Thought Experiment: Behavior of shadow of object moving at speed c
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Undergrad Can a Gyroscope in a Satellite Detect Orbit?
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Undergrad Physical Interpretation of Frame Field
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Undergrad Is this another "paradox" or a veritasium mistake?
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Graduate Assumptions of Hawking-Penrose 1970 Singularity Theorem
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Undergrad Gyroscope angular momentum: direction and curvature
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Undergrad Does a person's mass affect time?
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Undergrad About the notion of non-standard inertial frame
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Undergrad Is using r as a coordinate in Birkhoff's theorem a limitation?
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Undergrad Question about special relativity and magnetism
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Undergrad The Einstein Clock aka Light Clock
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High School Train Fall Paradox
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Undergrad Integration of energy-momentum pseudotensor for Kerr BH
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Undergrad Why is the speed of light the same everywhere in the Universe?
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Graduate Jackson: justification of the Poynting vector by GR
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Undergrad Relativity of simultaneity in actuality
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High School Reciprocal time dilation
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High School Photon Energy Without Rest Mass – How?
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Undergrad The wave equation interpretation of special relativity
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High School Is there a white hole inside every black hole?
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Undergrad Synchronizing clocks at different locations to measure speed of light
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Undergrad An invariant while crossing the horizon
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Undergrad I don't see how a black hole's event horizon can be crossed
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Undergrad Variation of the lightning train thought experiment
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High School Project GRE^2AT - GR on Mt. Ranier
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