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 Help understanding proof of ds=ds' in Classical Theory of Fields
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B Nalini Joshi's Time Travel Ideas
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I Constants of motion symmetric spacetimes
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I Speed of information-carrying radiation
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A Zeroth law of black hole thermodynamics
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I Is Spacetime a Real Physical Entity or Merely a Conceptual Framework in Physics?
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I Quaternions and Special Relativity
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I Escape velocity near a black hole: Newtonian or Special Relativity?
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I Circumnavigating the Universe in Cosmos (1980)
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I Definition of time-independent scalar field in GR
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I Congruence of curves in spacetime
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I Distance between two light pulses
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A Timelike curves on event horizon
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I Solution To Photon Trajectory Equation
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A How to show spin ##= \pm 2/\omega## for a circ-polarized gravity wave
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I Inertial reference frame and Bondi k-calculus
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I Regarding centrifugal effects on the time dilation of a moving clock
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I A question about Curved Spaces: Gauss and Riemann (Einstein Gravity in a Nutshell by Zee)
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A Stationary solutions to Klein Gordon equation in spherical symmetry
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A Exact meaning of the mass M in the Kerr metric event horizon formula?
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I Handshake paradox involving the Starship Enterprise
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A Metric of the "space" of 3d rotations
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I Spatial homogeneity condition for a free particle Lagrangian
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I Comparing Tick rates of clocks across Frames
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I What causes an accelerated clock to record less events
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I Symmetrical acceleration of Synchronised clocks
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I Doppler effect in transparent media and the index of refraction
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I Spaceship drive using symmetrical frame dragging?
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B Can the same ruler have two different sizes?
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I Can Propeller Speeds and Wave Breaks Challenge the Speed of Light?
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A Making sense of Dirac's rotation operator in "General Theory of Relativity"
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I Derivative w.r.t. time of relative position in special relativity
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I How Can I Get Published Without an Endorsement?
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A Inferring coordinate change from the form of the metric
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B Can We Use Space/Time Fabric to See the Past?
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A Merging timelike and spacelike surfaces
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A Can gravitational energy be localized in the case of plane waves?
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I Series Expansion of the Infinitesimal Spacetime Interval
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I Understanding the Equivalence Principle
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A New Adler book on GR: Why do these coefficients go to zero?
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I How can the Universe know when you change directions?
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I Two or more gravitational lenses perfectly aligned with Earth?
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I Reflections on Relativity web pages broken at mathpages.com
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B Is this an Unavoidable Collision between 2 spaceships traveling at 0.6c each?
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I What Is the Radius of Curvature of Space on Earth's Surface Due to Its Mass?
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I What Experiments Demonstrate Time Dilation?
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B What if we use a non physical reference point to measure an object's mass?
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A Quantum mechanics and frame dragging
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I Fermi-Walker transport of proper acceleration along timelike congruence
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I Mother of all equations for the Lorentz force
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I Properties of Born rigid congruence
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I Muon travel distance vs Atmosphere Thickness?
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B Which term of the Einstein equation is larger?
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I Can there be a maximum curvature of spacetime?
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A Does deceleration cause linear frame dragging?
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I For a relativistic spaceship, what is the most recent news the ship gets from Earth?
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A Where Can I Find Detailed Derivation of Teleparallel Gravity Field Equations?
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I Bell's Spaceship Paradox, Born Rigidity, and the 1-Way Speed of Light
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I Is there a gravitational effect on spatial measurements
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I How can the volume of a star be determined?
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On the order of indices of the Christoffel symbol of the 1st kind
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I Deriving e=mc^2, how is it possible?
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B In GR gravity, does "equal and opposite" still hold and what does that mean?
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I I want a good reference to a discussion of the meaning of "the speed of light is constant"
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I Potential Energy in a Stretched String in SR
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I Correct Description of Black Hole Interior
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B Is crossing a black hole's event horizon possible?
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I How Does Mass Influence Spacetime Curvature?
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B How fast are gravitational forces transmitted?
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I GPS system and general relativity
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B Why do people care about vacuum solutions in GR?
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I One-Way Speed of Light: Is it Possible?
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I Question about Two Clocks in this Relativity scenario
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B A question about quarks and black holes
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B Questions about space and matter
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I Why does general relativity break down at high energies?
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Can an imminent laser strike ever be observable?
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I Bell's spaceship paradox unknown? Interpretation?
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B Does Relativity Impact Gravity's Influence on Fast-Moving Objects?
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I Why Is the Invariant Interval True for All Values of s?
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I Twin Paradox - difference between outbound and inbound
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I I have a question about gravity -- If the value of the energy momentum tensor (Tμν) becomes zero, can it become gravitational-free?
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I What if particles are moving near light speed and one slows?
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I Does Phantom Dark Energy Violate Conservation of Energy?
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B What Are Gravitational Waves?
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A Parallel Transport and Geodesics
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I Understanding the phrase "simultaneity convention"
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I EM Faraday tensor transformation for conductor carrying current
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B E-field of a constant velocity charged particle
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I Experimental evidence of the existence of an event horizon
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I Can “speed of light” distinguish all Timelapse videos from real motion?
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I Spacetime coordinate smoothness requirement
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I Gallilean v/s Lorentz transformation
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I Did the Michelson-Morley Experiment Disprove the Ether Theory?
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I Gravitational wave propagation in GR
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I Information transfer between moving bodies - sped up or slowed down?
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A Dirac "GTR" Eq. 27.11 -- how to show that a boundary term vanishes?
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I Does expanding space cause cosmological redshift?
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I What if one is in 1905 and debating foundational fundamentals?
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I Couple questions about time re-scaling function in Birkhoff’s theorem
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