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 On the existence of Gravitational energy in General relativity
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I Null energy condition constrains the metric
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I SR flat Lorentzian manifold and Anderson simultaneity convention
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I The generators of a ``Poincare-type'' group in momentum space
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I Understanding Spacetime simultaneity in twin paradox scenarios
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I Construct a Diagram that Illustrates The Galilean Law of Addition of Velocities
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I Standing light waves if the one-way speed of light were not constant?
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I Evaporating black hole: First principles consideration
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B Falling into a black hole
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I Pullback & orthogonal projector
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I Unruh Radiation and Black Holes
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B Is velocity the reason for the time dilation effect?
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I Manifold with boundary
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I How to get metric field using a path dependent parallel propagator
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I What are Killing vectors?
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I Is this a Killing vector field?
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I Which theory of time is the most evidence-based?
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B Implications of negative Michelson-Morley result
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A Variation of CMFR mass density ##\rho## along a world line
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I Time dilation from galactic gravitational mass
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B Detection of red-shifted photons near an event horizon
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I Is time dilation a real effect?
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I Falling through the event horizon of an evaporating black hole
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B Mass defect and electron transition
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A Synchronous to Newtonian gauge
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I A. P. French "Matter and Radiation: The Inertia of Energy"
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B Excellent Free Course On Einsten, Relativity, His Views Etc from Harvard
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I Killing fields commute if they are asymptotically coordinate?
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I Meaning of the invariants built from the angular momentum tensor
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I Conservation of stress-energy tensor
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I Can the expansion of the Universe reduce the energy of a photon to 0?
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A Boundary conditions in ##\delta I=0## to derive Einstein's equations
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I Orbital Period In General Relativity
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I Strange index notation for linear transformation matrix
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I Israel Junction Conditions: Finding Continuous Metric Across Shell
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I Dark energy and conservation of energy
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I On the physical meaning of Minkowski's spacetime model
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I Charged box mass-energy
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B Why is it impossible to go faster than the speed of light?
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I Linearised gravity approach to Lense Thirring metric
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I Black Holes Colliding Exactly Head On
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A What does Dirac mean by "the suffixes would not balance"?
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A How do we interpret measurements of Mercury's position?
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A Dirac comment on tensor densities (Dirac GTR, p. 37)
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I Transition of spherically symmetric gravitation
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A Dirac's coordinates ##(\tau, \rho)## for the Schwarzschild metric with ##r \le 2m##
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A Variation of the kinetic term in scalar field theory
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B Do observers always agree on the number of waves in a beam of light?
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I Questions about Hawking radiation and extremal black holes...?
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I Coordinate Transformation versus Change of Synchrony Convention
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B Help understanding the Relativity of Simultaneity
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B Entering a black hole -- I know I must be wrong (Help me understand why)
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I Einstein brother-in-law elevator
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I Bell's spaceship paradox
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I Ricci tensor from this action
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I How Relativistic Speeds Affect Time Perception on a Spaceship
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B How are 'fringe shifts' in the Michelson-Morley experiment calculated?
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I Explanation for Galaxy Rotation Curves
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I One difference between GR and quantum mechanics
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I Move Stress-Energy tensor to the left side of EFE?
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I Would moving the mouths of a wormhole affect the internal distance?
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I Photon in a mirrored box moving in direction of travel
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B Energy loss of a photon
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I Battery life on VERY fast moving object
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B Time and right angle traveling twins paradox
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I A problem in the equations for Einstein's Special Theory of Relativity
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I What is the fabric of space-time made up of?
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I Does the speed of light pop out of other theories than EM?
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I Why are rotated parallel axes still parallel?
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B Prove that metric tensor is covariant constant
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I How relative is the magnetic field of a current carrying conductor?
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I The answer for the total mass of the Universe?
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A Movement vs expansion in space
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I Does potential energy curve spacetime?
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I Relativity of Simultaneity and Length Contraction
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A Why ##A_{\nu:\sigma}=0## in flat space?
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I Mathematical problem with Schwarzschild spacetime?
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B Gravitational potential energy, a thought experiment
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B New Paradox Discovered, I Think
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I Dirac comment on covariant derivatives
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I Lorentz Transformations Confusion
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B Does the age of the Universe differ for observers in expanding space?
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I Newton Galilean spacetime as fiber bundle
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I Macroscopic objects in free-fall
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A Coupling torsion to electromagnetism and torsion tensor decomposition
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I Galaxy recession and Universe expansion
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I Is momentum conserved as a body falls through a gravitational field?
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I Does Kerr's argument against singularities apply to all black holes?
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I Doppler and Searchlight (Headlight)
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I Difference between the Shapiro Delay and time dilation?
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I Is the electromagnetic 4-vector indeed a 4-vector?
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I Is Relativistic Action for a beam of light = zero?
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I Spacetime expansion - time dimension expansion
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I Perceive Length Contraction VS Terrell Penrose
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I Light clock running faster than light?
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I Time dilation vs Differential aging vs Redshift
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B Why Does Black Hole Entropy and Information Loss Matter?
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I Question about length contraction
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I Teaching Minkowski diagrams effectively
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A Can We Construct a Coordinate Chart Where Bell Observers Are At Rest?
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Relativity

The theory of relativity, formulated by Albert Einstein, comprises two fundamental theories—special and general relativity. Special relativity, proposed in 1905, redefines our understanding of space and time by asserting the constancy of the speed of light for all observers and introducing concepts like time dilation and length contraction.

General relativity, presented in 1915, extends these principles to incorporate gravity. It describes gravity as the curvature of spacetime caused by massive objects, leading to phenomena like gravitational time dilation and the prediction of black holes. Einstein's equations have been consistently validated through experiments and observations, profoundly influencing our comprehension of the universe's fabric and dynamics.

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