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 Why Must Pure Force Depend on 4-Velocity?
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High School Any Feasible Faster-Than-Light Interstellar Travel?
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High School Redshift of a light pulse between 2 accelerating rockets
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Undergrad Do any real macroscopic black holes have a singularity?
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Graduate Photon speed for an observer at the photon sphere
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Undergrad Terrell rotation is confusing!
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Undergrad SR textbooks discussing accelerated reference frames without delving into GR
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Undergrad Speed of Light Could be Reached and Indeed even Exceeded
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High School Can a Gravitational System be Treated as a Single Curved Spacetime?
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Graduate Extra (boundary?) term in Brans Dicke field equations
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Undergrad Congruent worldlines in "static" gravitational field
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Undergrad Curved spacetime and measurement direction
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High School Relative rate of clock ticks on the radius of a rotating disc
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Undergrad Minkowski metric and proper time interpretation
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Undergrad Special Relativity: an ideal experiment
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Undergrad Understanding Relativity of Simultaneity in Resnick, Part II
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Undergrad Smooth coordinate chart on spacetime manifold
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Undergrad Reference systems and apparent counter-explanations on Twin Paradox
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Undergrad Understanding Relativity of Simultaneity in Resnick, Part I
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High School How quickly does the Earth feel the effects of a halved Sun's mass?
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Undergrad Is the Kroneker Delta Identity Used Correctly in this Paper?
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Undergrad Paradox of the car and the driver in SR
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Undergrad Doubts about the relativistic description of electrical interactions
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Undergrad How Does Special Relativity Affect Perceptions of Simultaneity?
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Undergrad How many meter sticks are there in this length contraction reasoning?
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High School What Is Relativity Theory in Simple Terms?
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High School Measuring the speed of light on moving systems
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Undergrad What causes the magnetic force in a uniform magnetic field?
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Undergrad Can gravitational lensing detect Very small deviations in light propagation?
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Undergrad Can we choose different functional forms for Lorentz transformation?
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Undergrad ##x'=0## and ##t'=0## axes in railcar thought experiment
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Undergrad Question: Interpretation of Current and Magnetic Field Using Relativity
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Undergrad Ricci notations and visualisation
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Undergrad Why Do Some Events in My Lorentz Transformation Appear Incorrect?
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Undergrad Coulomb gauge Lorenz invariant?
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Undergrad Question about gravity being a distortion of spacetime
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High School Is the Speed of Light Consistent Across Rotating Reference Frames?
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Undergrad Integrate time dilation with derivative
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High School Does Time Move Slower for Travelers in Special Relativity Experiments?
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High School Difference between special relativity and redshift?
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High School What is the general transformation formula for uniform proper acceleration?
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Graduate How can I calculate the square of the Pauli-Lubanski pseudovector?
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Undergrad Sagnac gyroscope affected by linear acceleration?
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High School Cosmic expansion and shock waves
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Undergrad Non-commutativity of unit polar bases
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Undergrad Recast of a conformal line element
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High School Speed of separation of two masses
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Undergrad Suggestion for 2 more GR tests
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Graduate Electrodynamics of moving bodies - §2: On the relativity of... (again)
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Undergrad Is a Gravitational Field Real or Just a Coordinate Transformation Artifact?
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Undergrad Time intervals measured by stationary and moving observers
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High School How do space and time fuse together to form “spacetime?”
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High School A contradiction of the equivalence principle?
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Undergrad Question about the Minkowski diagram
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Undergrad Twin paradox, virtual clock on ship with Earth time, discontinuity
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Undergrad How Can I Design an Experiment to Ensure Simultaneous Light Arrival?
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Undergrad A Hidden Zero in Einstein's Simple Derivation
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Undergrad Observation of the effect of gravity on the motion of antimatter
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Undergrad The Mirror Paradox: Exploring Special Relativity Theory
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Undergrad Why are Kruskal coordinates related to a freely falling observer?
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Undergrad I think the special theory of relativity self-contradicts
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Undergrad Ricci Scalar For Astronomical Body
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Undergrad Analog TV reception in a spacecraft moving relative to the Earth
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High School Thought experiment: The twin paradox, observed from far away
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Undergrad Is Simultaneity Absolute or Relative in the Theory of Relativity?
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High School How fast do space-time changes propagate?
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Undergrad Eddington-Finkelstein coordinates for Schwarzschild metric
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Graduate Galactic Rotation and Energy-Momentum Tensor
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Undergrad Physical meaning of null spacetime interval
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High School Creating Metric Describing Large Disk
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High School Can Dark Flow Be measured, based on Special Relativity?
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Graduate How is eq. 1.5.3 written using three-vectors and how does it lead to eq. 1.5.4?
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Undergrad How do you differentiate between the inner and lower indices on a Lambda tensor?
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Undergrad Spacetime distance and ruler-measured length on an XT chart
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Undergrad A question about static spacetime in GR
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Undergrad A question about geodesics and notion of parallelism
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Undergrad What is the proper time of a vertically moving inertial clock?
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Undergrad How can a square-based lattice turn into a circular-based one?
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Undergrad Is an accelerating frame the same as an inertial frame at a point?
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High School How to measure time in reference frame with clock?
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Undergrad Obtaining the matter Lagrangian from the stress energy tensor
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High School Further Understanding Simultaneity Conventions
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Graduate General equation for hyperbolic motion in a 2D plane -- Help needed please
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Undergrad What are the effects on a stationary observer for Kerr metric?
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Undergrad Action of metric tensor on Levi-Civita symbol
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Undergrad Covariant divergence of vector; physical meaning with contracted Tuv
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High School Video: Mathologer on visual logarithms (and hyperbolic trig)
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Undergrad Are photons definitely massless?
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High School Another special relativity related "paradox"
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High School Is there a lining to our Universe?
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Undergrad Help Understanding Equation 3.6 in Covariant Physics by Moataz H. Emam
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Undergrad Galilean relativity for 2 frames
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Undergrad What is the Connection Between Black Holes and the Big Bang?
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Undergrad Inverse Square Law for Black Holes
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Undergrad Can you increase the mass of a closed system with information?
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High School What is the distinction between the Weak and Strong Equivalence Principles?
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Undergrad Asymmetry in Length contraction?
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High School Is Time a Fundamental Force in Physics?
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High School Is Time Defined by Relative Motion in SR and GR?
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Undergrad Special Relativity Paradox "Terrorist and Spaceship"
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