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.
I Effect of Black Hole Spin on Gravity
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B What Causes Mass to Exert Gravitational Pull?
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A Solving Equation 15.43 Line 2 to 3 in Tevian Dray's Differential Forms
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I Spatially Homogeneous Scalar Field on Spacetime: Showing $\nabla^2 f$
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A (paper) Stability properties of Kerr BH's
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I Being at the position of a singularity before it is formed
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B Can gravitational time dilation explain the galaxy rotation curve?
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I 4D d'Alembert Green's function for linearised metric
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B Andy Weir's "Hail Mary": Question About Relativistic Rocket
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B Twin Paradox (3 objects version)
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I Calculating Particle Redshift at Time t_0 & t_1
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I The Derivative Nature of Time and Its Relation to Earth's Rotation and Speed
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I Follow Up on M. LeBellac & J.M. Levy-Leblond's "Galilean Electromagnetism
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A What assumptions underly the Lorentz transformation?
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I How is proper time visualized in the FLRW metric's 4D spacetime geometry?
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I Only Minkowski or Galilei from Commutative Velocity Composition
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I Gravity Wave Speed: Deriving Constancy from Maxwell Eqs.
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I Understanding Covariant and Partial Derivatives in General Relativity
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I Lorentz Transformation Derivation: Assumptions Req'd?
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B Calculating Time Dilation w/ Light Clock - Implications & Mistakes?
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B Cosmic Inflation & Censorship: Validation or Corrections?
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I What Happens Inside BH Event Horizon?
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I Calculating Relative Change in Travel Time Due to Spacetime Perturbation
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I Please help with my spacetime diagrams (relativity problem)
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B Time: What We Read On The Clock?
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I Diagonal Matrix of Stress-Energy Tensor: Why?
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I Why Does Covariant Index Represent Partial Derivative in Special Relativity?
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I Conserved Quantity Along Affine Parameter
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I Light Clock Relativity: Why Divide T_moving/T_stationary?
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I Question about Stress-Energy Tensor: A First Course in GR
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A Is Gravity Just the Electrostatic Force?
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B Can Particles Escape a Black Hole? The Hawking Radiation Improbability
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I Uniform gravitational field possible in GR?
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A Connectedness of Boundary Points in Schwarzschild Penrose Chart
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I Definition of "Physical Frame": All You Need To Know
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I Is the concept of a one-way speed of light meaningful and measurable?
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B Object Weight on Magnetar vs Neutron Star: Attract or Repel?
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A Special Relativity Fiber Bundle: R^3 & Lorentz Metric
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I Speed of Light: Spaceship & Gravity Law Impact
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I Why is Number-Flux Four-Vector Frame-Independent?
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I Velocity addition via k-calculus
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B Penrose Diag Black Hole: Riddle Me This
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I The Length of World Line: Prerequisite for Proper Time
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A Britgrav Weyl Tensor Research: Find Paper Authors, Title & Accessibility
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I Why Is Minkowski Spacetime Non-Euclidean?
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B Does Mass Have Lasting Gravitational Effect Over Time?
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I The Theoretical Minimum: Length Contraction and Time Dilation
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A Units of Kerr Understanding Mass & Angular Momentum
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B Free Fall in Curved Spacetime: Does Minkowski Spacetime Exist?
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I Searching for "Why Is Minkowski Spacetime Non-Euclidean" by Cronkhite
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I Constraints on Lorentz Velocity Transformation
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I Can Maxwell's Equations Explain Gravitation Through Retarded Wave Solutions?
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A Schwarzschild Geometry: Evaluating Proper Distance
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B Orthogonality in Minkowski Spacetime: Meaning & Visualization
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I Co-Moving Coordinates & Lapse Function N(t) in ADM Decomposition
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I Will a spherical mass be set in motion by a spherical shell rotating around it?
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B Proving Reciprocity Of Time Dilation
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I Applying Velocity Addition in Rotating Frame: Is It Correct?
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I Shape Dynamics: How Can It Offer Same Predictions as GR & SR?
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I Questions concerning the geometry of spacetime
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B Can Black Hole Gravity Be Overpowered?
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I Relativistic Velocity Addition: Calculating Electron Speed
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I Does the Light's One/Two-Way Speed Distinction Mean Anything?
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I Calculate Eigenvalues of Electromagnetic & Stress-Energy Tensors
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A Worked examples Cartan Formalism
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A Relativistic Hydrodynamics Eqn for Perfect Fluid: Insight Needed
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I Why am I getting the wrong conclusion from my spacetime diagram?
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I Instrument Size & Wavelength: What's the Relationship?
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I Raising & Lowering Indices: Q&A on Relativity
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B Can a Planet Made of Glass Generate Free Energy?
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I Potential Energy in Wormholes: Charged Particles & Electric Fields
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B Sagnac effect for matter beams
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I Is the Killer Crate Paradox Resolved?
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I Doppler Analysis of Twin Experiment: Valid Argument?
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I How Can Outward Normal Vector Point Inwards?
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I Einstein Definition of Simultaneity for Langevin Observers
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I Infinite Frequencies & Extraterrestrial Signals: What Are We Missing?
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I The Units of the Cosmological Constant: eV^2
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I Simulating GR: Worth the Effort?
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I Fermi-Walker Transport: History & 1932 Paper
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B Time Dilation & Muon De Broglie Wavelength: Explained
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B What Does Hawking Mean by Negative Energy at the Big Bang?
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B Parallel light reflection for a one-way speed of light measurement setup
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I Kronecker Delta: Order of Indices Explained
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B Travel 7 Light Years at 50000km/s - How Long?
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I Is Time Dilation Just a Misunderstanding of Clock Errors?
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B Time Dilation on Rotating Disk: Clocks on Disk Perspective
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B General Relativity & Ether: Clarifying a Contradiction?
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A Curvature & Connection Without Metric
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I Energy Density in E Field: Does it Contribute to Inertial Mass?
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I Physical meaning of a spacelike geodesic
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A Can a conformal flat metric be curved?
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I Radiate Single Charged Particle: Free Fall in Black Hole?
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I Distance Contraction: Is D or D*sqrt(1-(v/c)^2) Traveled?
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Insights Rindler Motion in Special Relativity: Hyperbolic Trajectories - Comments
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A Generalize Special Relativity for Flat Spacetime
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I Gravitoelectromagnetism: Why Equation Differs in Sources
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A Affine Spaces and Vector Spaces
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B Gravitational Time Dilation on Mountaintops: New Member Questions
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I Effects of Supermassive Black Hole Merger on Nearby Bodies
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