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 Uncovering a Decent Proof of E=mc^2
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I Calculating Covariant Derivative of Riemann Tensor in Riemann Normal Coordinates
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B Explanation of light speed limit
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B Time Dilation: Does Observer See Your Time Speed Up?
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I Coordinate System for Minkowskian Spacetime Relative to Event
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I General relativistic comparison to Newtonian physics
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A Essential Difference Between Crossable & Non-Crossable Event Horizons
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I Stress-Energy of Star Collapsing into Black Hole
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A Fluid Flow Symmetry: Showing $\pi_b G^b$ is Constant
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A Thermality & Nonthermality of Radiation in Curved Spacetimes
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I "Testing the black-hole area law with GW150914"
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I Calculating Time Elapsed in Rocket Collision
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A Geodesic Expansion: Finding the $\theta_{\pm}$ Factor
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B Sine-Gordon model for better understanding of special relativity?
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I Electromagnetic Field & Space-Time: Relationship Explained
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I Gradient Energy: Definition & Classical Mechanics
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A Gravitational Quadrupole Formula: Polarization Tensor
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B What Drives the Acceleration of the Universe's Expansion?
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I Transforming Object Positions b/w Frames: A Procedure
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I Does the Topology of AdS4 Affect Global Hyperbolicity?
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I The bending of starlight is twice the Newtonian prediction
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A Computing Null Geodesics in Schwarzschild Geometry
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A Calculating Lie Derivatives for Tensors & Vectors
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I Light Clock Animation App: Find, Start & Feedback
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B Time Dilation Effect: Corrections to Clocks on ISS
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B SR equation seems to depend on orientation of the 'light clock'
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B Is E=mc^2 a Bidirectional Equation in Physics?
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I Does charging my phone increase its gravitational force?
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I Correlation vs. Causation: Knowing the Difference
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I Identifying Manifolds with Different Co-ordinates: Easy Solutions
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I Find GR Equation: Collapsing Orbit & Gravitational Wave
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I GR: Can Units Tell You if Quantity is Covariant or Contravariant?
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B What Is the Proper Time of the CMB and Its Implications?
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B Time like spacetime interval, proper time, and time dilation
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A Kerr Metric Time Dilation Formula: Deriving Absolute Form
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I How Does the Twin Paradox Apply to Light and Sound Waves?
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A Gravitational field of an infinite flat slab
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B What Happens to Time and Space Near a Black Hole's Event Horizon?
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A Finding Killing Vectors of FLRW Metric: Simple Equation?
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I C in a Vacuum: Evidence of Constant?
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I Boost Generators: Physical Meaning & Observable Quantities
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I Leading Clocks Lag: Twin Paradox Explained
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A Non-Linear Theory: Summation Meaningful in Einstein Gravitation?
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I Speed of EM & Mech Waves: Maxwell's Law Explained
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I Twin Paradox: Spacetime Physics Ch.4 & 202 Year Difference
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B I have a conceptual question about relative mass
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I Configuring Laws of Motion: Static/Dynamic
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I Could spacetime be non-orientable?
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I Summation notation and general relativity derivatives
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I Solving Proca Lagrangian w/ Extra Operator: Find Laws of Motion
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I Does Time Slow Down in a Deep Osmium Room?
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I Laws of Motion for New Lagrangian: Partial Differential Equations
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I Compute Length Contraction: Is ##l=1## a Possible Model?
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B Helium Balloon: Explaining Special Relativity Effects
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I Lorentz Ether Theory: History & Explanation
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I Riemann Curvature: Understanding Parallel Transport on 1D Rings
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I Metric: Proper Space vs Coordinate Space
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B Can Relativistic Effects Alter Thermodynamic Processes in Experiments?
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A Kerr Metric: Removing Singularity via Coordinate Transformation
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I If energy is relative, is the rest mass also relative?
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I Are Tidal Forces Curvature of Space?
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B What Happens If You Become Completely Still in Space?
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B How does special relativity apply to the rocket equation?
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I Special Theory of Relativity & Conservation of Mass
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I General relativity - covariant superconductivity, Meissner effect
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I Calculating the Area of an RN Event Horizon with Specific Heat Formula
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I Michelson-Morley Experiment: Objection Explained
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I Why is Scalar Massless Wave Equation Conformally Invariant?
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B Find Numerical Relativity Source Code
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I Can a distant object behind a cosmic string appear as a double image?
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B Can Energy Really Be Converted to Matter in Everyday Life?
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I Linear & Rotational Motion: Speed of Tip in Lab Frame
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B Thought Experiment : Try and get Alice to "0%" the Speed of light
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B Conservation Laws & General Relativity: Understanding Energy
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I Components of *J in Kerr geometry
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B How Can We Derive the Relativistic Rocket Equation?
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A How can I take the derivative?
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A Obtaining the Orbit equation (Effective Potential) from the Newtonian metric
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A Exploring Epsilon Simultaneity: Advantages and Applications
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I Is mass the source of spacetime?
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B Relative speed of two oppositely directed light beams
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B Travel Times & Distances: Twin Paradox & Alpha Centauri
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A Solving Linearized EFE for Newtonian Potential Under Lorentz Gauge
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I Rate of Time/Mass: Is There a Constant?
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A Find SEM Tensor from Lagrangian of Temporal Variable
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A Asymptotic Flatness: Minkowski Spacetime & Galaxy Scale
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I Asymptotically Flat Schwarzschild Metric
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I Computing Ricci Tensor Coefficients w/ Tetrad Formalism
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A Deriving Essential Quantities from Metric Tensor for GR Calculations
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I One way speed of light measurement
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A Differential Geometry Class: Suggestions Welcome
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I Understanding Pseudo-Angles in Minkowski Space: A Geometric Interpretation
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A De-Sitter Spacetime: Is it Homogeneous & Isotropic?
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I Explaining Sagnac vs. SRT Violation & Reconciling Lorentz Transform
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A Hypersurface Definition Confusion in General Relativity
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I To derive an equation of black hole thermodynamics
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I Weak Gravitational Field & Wave Eq. - Analyzing Effects on Massless Scalar Field
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I Conformally related metrics have the same null geodesics
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I Precession of a spherical top in orbit around a rotating star
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I Length contraction and time dilation
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