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 is √(gμνdxμdxν) the Lagrangian for Geodesic Eq?
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Graduate Einstein's Definition of Mass: m = E/c^2
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High School Does the mass of an object increase in a gravitational field?
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High School Measuring Michelson–Morley light beams
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High School Gravitational force of the Earth and Moon
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High School Gravitational waves for data communication?
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Undergrad Doppler like effect affecting observed time for a moving object
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Undergrad Second Derivative of Time Dilation Equation
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Undergrad Minus sign in Minkovsky´s metric
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Undergrad Inhomogeneous Wave Eq. & Minkowski Spacetime Interval
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Graduate Understanding the Tetrad Formalism in General Relativity
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Undergrad Simultaneity on a moving train
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Undergrad Gravity in General Relativity: Explaining Acceleration
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Undergrad Zero Gravity Near a Black Hole?
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Undergrad Detect Negative Mass Matter: Experiments in Solar System
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High School Minkowski Diagram: Expanding Universe
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Graduate Action for a relativistic free particle
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Undergrad Negative Mass & White Holes: Does It Create?
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High School What Happens When We Cross the Event Horizon of a Black Hole?
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Undergrad Is a clock on the equator time dilated?
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High School Can gravitational time dilation explain the photon's deflection near the Sun?
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Undergrad Orbital Simulator with general relativity
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Undergrad How does everything move at C through spacetime?
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Graduate How Does the Four-Way Vector Operation Relate to Potential Energy in Gravity?
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Undergrad Lorentz Transformation in One-Dimensional Space
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Undergrad Maximally extended Schwarzschild spacetime
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High School Speed of Light -- Why doesn't it add to the speed of the emission source?
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Undergrad Einstein's Elevator: Gravity vs Acceleration
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Undergrad Time Before Big Bang: Relational Dynamics & Singularities
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High School Travel at 0.5c & Observe Redshifted Light Traveling at c
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Undergrad Find E' in FLP Volume 1 17.4: Why Does It Work?
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Graduate Levi Civita - SO(4) Group Theory: Proving Relation in Landau and Lifshitz
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Undergrad Locally inertial reference frame problem
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Undergrad What is the canonical form of the metric?
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High School Take on Length Contraction at relativistic speeds
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High School Beyond the Black Hole Singularity
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Undergrad Can two inertial frames differ by the speed of light?
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Graduate Einstein Field Equations: Covariant vs Contravariant
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Undergrad Solve General Relativity "Paradox" w/ Automatic Diff. ODE Solver
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Undergrad Understanding the Relative Velocity Paradox
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High School Struggles with the geometrical analogy
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High School Verifying Time Effect of Gravity: Accurate to a Few Thousands of a Percent
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Undergrad Computer Performance Evaluation (CPE)
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Undergrad Why is the Energy Momentum Tensor of a Perfect Fluid a Tenso
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High School Understanding Special Relativity: 2nd Year SR Course Explained
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Undergrad Do we have to accept the physical existence of time?
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High School Einstein's definition of synchronization
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High School I got confused about SR after trying to reply to another
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Undergrad Einstein & Relativity: Metric, Tensor Fields, Scalar Product
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High School Time Dilation Theory Flaw: How Can They Be Different Ages?
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Undergrad Confusion about Einstein notation
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Graduate Distinguishing Riemannian Manifolds by Curvature Relationships
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High School Big Bang Theory: If There's No Center, How Is Universe Infinite?
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High School Does Energy Have Mass and Other Beginner Physics Questions?
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Undergrad Solve General Relativity Equation: Steps & Tips
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High School What is wrong with gravity equations?
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Undergrad EM Lagrangian: Question on $(\partial_\mu A^\mu)^2$ Term
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High School Does time dilation prove the existence of an absolute zero velocity?
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High School Gravitational waves of moving or vibrating masses
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Graduate Electromagnetic tensor and time reversal
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Undergrad Favorite Visualization of General Relativity?
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Undergrad Connection between entropy and time travel?
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Undergrad Is the Speed of Light Bidirectional in an Expanding Universe?
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High School Special Relativity & Acceleration: Unequal Inertial Frames
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Undergrad Acceleration vs Gravity in General Relativity
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High School Velocity Addition Q: Ball Thrown from Moving Ship?
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Graduate Killing vector notation confusion time translation
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Undergrad Escape Velocity: Newtonian vs Relativistic
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High School Learning Lorentz Derivation: Solving x=vt+γx' vs. x=vt+x'/γ
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Undergrad Why Not Develop Relativistic Gravitational Theory Analogy to Electromagnetism?
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High School What is the meaning of the famous equation E=mc^2?
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Undergrad Killing Equation: Why Set g_μν,ρ V^ρ = 0?
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Undergrad Lorentz Transform of E and B: Considerations by DJ Juggernaut
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High School Is the Lorentz transformation about observers?
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High School Moving Charge in a Magnetic field Problem
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High School Basic Lorentz transformation derivation
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Undergrad Time dilation for the Earth's orbit around the Sun
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Undergrad Gaussian normal coordinates and Riemann normal coordinates
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High School Is the Andromeda Paradox accepted in physics?
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Undergrad Proving Geodesics in Hyperbolic Geometry
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High School Near Light Speed Runner: Will We See the Light?
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Undergrad Connection Types: Affine vs Non-Affine
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High School Which Watch Will Have Slower Time: Object 1 or Object 2?
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Undergrad Gravitational Effects on Age of Earth's Core
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Undergrad Bijectivity of Manifolds: Can m≠n?
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Undergrad Why are direct sums of Lorentz group representations important in physics?
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Undergrad Displacement vector in general relativity
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High School Is Spacetime Really a Block Where All Moments Exist Simultaneously?
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Undergrad Time dilatation thought experiment
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High School Is the speed of light constant to all observers?
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Undergrad Newtonian analogue of energy-momentum relation?
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Undergrad Motion of Null, Timelike & Spacelike Particles
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Undergrad Why Don't We Detect Gravitational Shadows?
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Undergrad Measuring Star Radii with General Relativity
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Undergrad Are wormholes and tachyon fields unified?
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Undergrad Writing Metric in Matrix Form: Method?
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Undergrad Convert Metric Tensor to Gravity in GR
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Undergrad Does S-T Curvature Change Particle Shape?
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Undergrad Are All Particle-Rest Inertial Frames the Same?
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Undergrad Is current in a wire frame-specific?
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