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 Synchronizing clocks in an inertial frame if light is anisotropic
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I Intrinsic curvature
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I Conventionality of the One-Way Speed of Light
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I Question about Parallel Transport
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I Describing the Big Bang
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I Follow-up Einstein Definition of Simultaneity for Langevin Observers
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I Symmetry of motion in the special theory of relativity
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I Hawking After 54 Years Confirmed: BH surfaces don't shrink
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I A sufficient condition for integrability of equation ##\nabla g=0##
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I Follow-up on the Expanding Universe Insight article
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I How do Tensors "work" in relation to linear algebraic objects?
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I Confused about time dilation -- motion vs energy
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I Mass conservation in black holes
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I Please explain how length contraction and time dilation result in a constant c
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I Can this experiment break Lorentz symmetry?
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I MTW exercise 21.26: junction conditions for a thin shell of dust
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I Eddington’s margin of error
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I Understanding the historical shift away from absolute simultaneity
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I How do non-diagonal indices of a metric allow for local flatness?
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I Transformation for Lemaitre coordinates
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I Gravitation (MTW) Misner Thorne Wheeler - 50 years (RIP) C.W.Misner
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I Gravitational lensing of gravitational waves - real?
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I Freefall and gravity
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I How does GR deal with pointlike objects with mass?
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I Shwartzschild coordinate system
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I How to calculate basis vectors from metric tensor (as a matrix)?
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I With gravitational lensing, which way is down?
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I Question about a Square Light Clock
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I Theoretically, can perfectly flat spacetime exist in the Universe?
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I Invariance of 4-velocity
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I Another Time Dilation Question
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I ##\epsilon_{ijk}## in terms of ##\delta's##
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I Missing proof of the Shell theorem in General Relativity
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I Effect of Radiation Pressure on a Moving Object
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I Temporal length vs. Temporal displacement
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I Going Up-Down Elevator G-forces vs Bouncing off a Spring G-force
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I Principle of relativity in the proof of invariance of interval
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I Epstein diagrams and a traveling ship
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I Question about geometrical engineering (placeholder name)
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I What does g00 element of the Schwarzschild metric tensor tell us?
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I Integral subbundle of 6 KVFs gives a spacetime foliation by 3d hypersurfaces
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I A textbook passage describing coordinate lines in physical space
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I Twin Paradox Resolution
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I Notion of parallel worldlines in curved geometry
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I Where is the mass in a black hole?
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I Can light be reflected in a black hole?
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I Reconciling smooth spacetime with variable, rotating, earth gravity
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I Measuring the Spacetime Interval with a Ruler
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I Does the metric in general relativity depend only on position because of the equivalence principle?
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I About the meaning of "expanding universe"
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I CTC on FLRW cosmological models
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I Spacetime topology of the Universe
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I Clock rate in hyperbolic space-time manifold
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I E=mc^2 and acceleration
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I [SR] light shot at an angle in a moving train
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I Relativistic Doppler effect and refraction
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I "Exploring Time Perception Across Different Regions of Space"
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I Black hole and coordinate time from the perspective of Alice outside
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I Field equation interpretation
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I Black hole formation and infinite redshift
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I Two-way light speed invariance
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I Are equations for spacetime intervals correct?
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I Is there a maximum relativistic acceleration?
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I Why is Rømer's light speed measurement not one-way?
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I Relativity of Simultaneity question (use Einstein synchronization)
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I How to correctly mark event B on the picture?
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I Non-Inertial Relativistic Dynamics
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I Chain of lights falling into a black hole
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I An alternative derivation of the equation of motion in General Relativity
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I Alive in one frame and dead relative to other?
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I You can't actually enter a blackhole?
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I Relating orthogonal accelerations in special relativity
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I Angles between 4-vectors in special relativity?
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I Confusion about Cauchy surfaces
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I Lecture on Newtonian spacetime
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I Synchronizing clocks at different locations to measure speed of light
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I Path independence redshift photon
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I Charged particles and electromagnetic waves in transparent media
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I Lasting effects of Mass and Distance Dilation
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I The Faraday disk in the context of the theory of relativity
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I 2 objects of enormous volume each in relative motion very close to c
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I When Does a Train Passenger Experience Complete Darkness in a Tunnel?
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I Matrix form of metric component transformation?
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I Energy and reference frames
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I GR as Gauge Theory
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I Are Space and Time Just an Illusion in General Relativity?
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I Determinism & General Relativity: A Physics Primer
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I Transformation Riemann tensor to an accelerating frame
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I SR: GA Multivector vs. Tensor notation, Maxwell's equations
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I Time dilation for two observers in relative motion
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I Electromagnetic field in different reference frames
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I Time dilation and the human body
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I If electrons can be pointlike particles, why can't black holes?
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I Definition of tangent vector to a timelike geodesic
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I Tensor field from a covariant derivative operator (affine connection)
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I Can anyone clarify the relativistic twin paradox for me?
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I Why does laser beam hit the same target when fired?
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I Lorentz transformation on mode functions
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I A six-vector is related to a 2nd rank antisymmetric tensor in Minkowski Spacetime?
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I Is the weak field limit valid for the Brans-Dicke scalar field?
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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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