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.
Insights Slowly Lowering an Object in a Static, Spherically Symmetric Spacetime
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B Particle with negative mass inside a black hole horizon
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A Metric Form of ##g_{μν}## - Solving a Challenge
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I Are Basics of Cosmology Difficult to Grasp?
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Stats on Students Understanding Theory of Relativity
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B Relativity & Computer Calculations: Speed Up 300x?
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I How Elastic is Space (Spacetime)? | LIGO & Gravitational Waves
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B Length Contraction Thought Experiment: Spot Mistake/Wrong Assumption
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B Gravity & Dark Energy: Newton, Einstein & Beyond
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I Area & Volume Naming Conventions: 4 Questions
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I Penrose Singularity: Trapped & Anti-Trapped Surfaces Explained
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A LT & Translation Symmetry: Problem Analysis
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I Four-Vector in Spacetime: Invariance Across All Reference Frames?
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I Using AI for Gravitational Wave Generation
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I Frame Dragging Around Spinning Black Holes: Implications
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A Transformation law of the energy momentum tensor
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B Measurement of an unknown velocity vector of a closed space
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B Is the current definition of gravity accurate?
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I Who Will Win the Race at the Event Horizon?
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I An event being in the past of a timelike separated one
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B Expanding Universe: How Does It Conserve Energy?
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I Invariance of Diff. Line Elems. in Hartle's Gravity: Intro to GR
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B Accurate measurement of the speed of light
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B Who will win this running race?
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B What is the speed of a photon traveling along the sine function?
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I Exact historical explanation of deducing speed of light constancy
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B A thought Experiment in Time Dilation
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B Mass, Energy, and Space-Time: How Do They Interact?
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B Question about speed connection
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I Relativistic Work-Energy Theorem: Deriving Griffiths' Formula
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I How Do You Derive the Distance Formula for a Hyperbola?
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I Gravitational time dilatation and curved spacetime - follow up
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I Parallel Transport & Geodesics: Explained
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I Why do clocks show proper time?
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I Can We Confine Energy to Create Microscopic Black Holes?
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A Proving Free-Fall in Rindler Spacetime is Finite
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I Will anti-parallel light beams between two stars stay parallel?
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B Synchronization free of Contradiction: 1905 Paper
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A Can large Black Holes ever spaghettify? (and more)
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I Cosmology: Inertial Reference Frames & Misconceptions
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A Second Order Metric: Manipulating & Calculations for Einstein Equations
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I Measuring One-Way Anisotropy of Light Speed
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B Falling Clock & Black Hole: Measure Time or Disappear?
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B Velocity Addition: Unraveling the Mystery
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I Speed of Light in Vacuum in Non-Inertial Frame
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I What is the meaning of constant speed of light?
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I Solving Confusion About Black Holes, Schwarzschild Radius & Time Dilation
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I What are the Relativistic versions of Jefimenko's equations?
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I Solving Geodesic Eq.: Mysterious Conservation Eq. (Sec. 5.4 Carroll)
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I What are the many null-infinities in Minkowskian space?
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I Understanding Killing Vectors & Schwarzschild Geodesics
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A Understanding Christoffel symbol in GR context
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A Non-metric Compatible Connections: Physically Plausible?
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B Einstein-Poincare Clock Synchronization Convention
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B Scale of Measurement vs Equipment Sensitivity: Does Symmetry Always Hold?
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I Question on the energy needed to go at a relativistic speed
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I Did Einstein Formulate an Aberration of Light Using Tangents?
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I Strongest Evidence for Trapping Light in Schwarzschild Radius
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A Orthogonal spacelike and timelike vectors and inertial frames
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A Is 'Local Flatness' the Right Term for Describing Spacetime?
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I Big Bang Theory: Spacetime or Matter First?
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B Constant speed between 2 objects close to the speed of light
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I Is the Scale Difference Between E=pc and v=E/p Explained by Special Relativity?
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I Comparing Planck's Mass, Length, Time and Energy
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I How can Lorentz transforms be inverted?
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B Energy, Mass, Speed of Light: Can We Reach It?
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I How is the 4-Dimensional Element Volume Used in Quantum Physics and Relativity?
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I Why is the speed of light absolute?
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B Time dilation, relativistic mass and fuel consumption
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B Tensor Contraction with Metric for Stress Energy: Explained
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I History of E=mc^2 Before Einstein
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I Do We Need ESC in Earth's Atmosphere?
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B Meaning of "Speed of Light is Constant": Explained
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I Does Conservation of Momentum & Energy Hold in the C.O.M. Reference Frame?
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I Where is Contraction Point in Special Relativity?
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I Lewis H Ryder: Cartesian to Polar Coord Transformations
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I Accelerating Body Creates Space-Time Curvature?
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I Quadrupole Moment Time Variation: Does Coordinate Choice Matter?
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A Lorentz Transformation Derivation Question
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I Inertial frames in changing gravitational fields
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B Moving Faster Than Light: Are There Symmetrical Rules?
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I Is the inertia of a massive object the result of gravity wave generation?
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B What Conditions Allow for the Formation and Detection of Einstein-Rosen Bridges?
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A Time Measurement in Friedman Metric: Physically Possible?
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A Hawking Radiation: Understanding Complexity in Black Holes
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B Does Black Hole Gravity Cause a Blueshift in Approaching Light?
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A Magnitude 4-Vector Lorenz Gauge: Klein-Gordon Eq.
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B Do Photons Experience Time When Traveling at Light Speed?
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I Special Relativity & No Special Inertial Frame of Reference
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I Gravity at the Event Horizon of a Black Hole
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I Trace of the stress energy tensor
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I Everyone Measures Light in a Vacuum at the Same Speed
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I Electromagnetic Radiation in Strong Gravity Field
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I Microsoft Mathematics: Calculate EM Energy Momentum Tensor
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I Equivalence Principle: Locally Flat Spacetimes Explained
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I Covariant Derivative: Limits on Making a Tensor?
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I What is the Constant Speed of Movement through Spacetime?
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I Gravity: What Moves a Stationary Body?
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I Is Zero Curvature Space Equivalent to Flat Space in General Relativity?
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A Lorentz Invariance of Lagrangian: Proof & Explanation
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