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.
A Curvature with different connections on the two-sphere
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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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A Speed of Light for Bonnor Beam
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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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A Is Fatio–Le Sage's theory of gravitation an entropic gravity?
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B Is time an illusion?
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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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A Calculating geodesic equation from Hamiltonian in presence of EM
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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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I Robert B. Laughlin (Physics Nobel Laureate, Stanford University)
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I What about the Big Ben Paradox?
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I Using 4-derivative
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B Special relativity thought: Traveling to the future relative to a particle
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B Imaginary distance is nonsense
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B c^2 in Einstein‘s theory of relativity
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A Special Relativity in Rotating Reference frame
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I A question about the speed of light and electromagnetism
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I The Lorentz factor gamma and proper time
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I Can the intersection point of two light beams exceed the speed of light?
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I Need opinions on Youtube video: "From constant moving charge to SR"
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I A thought experiment on simultaneity
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I Speed of Light & Bullet
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I Question about length contraction and repulsive force
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I A matter of time dilation: how much time has actually passed?
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A Different time coordinates due to different velocities
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A Can We Flatten Space with York Decomposition?
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B Question about the Entropy of a Black Hole Singularity
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B But how does something start moving?
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B Events vs Effect of Events in Relativity of Simultaneity
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I Speed of light one more time
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I Principal and Gaussian curvature of the FRW metric
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B How does Einstein's equation work? Why do we need to square c?
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Insights Addition of Velocities (Velocity Composition) in Special Relativity
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I Physical Difference Between Co- and Contravariant Vectors
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B Let me ask a thing about the Speed of Light
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I Co- and Contravariance
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I Determining a stationary point of reference to base all absolute motion
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B Crossing the Bekenstein Bound at Black Hole Event Horizon
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I Relativity and a Mirror
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I Validity of Birkhoff's theorem in flat Minkowski spacetime
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B Challenging the notion of "crossing" a black hole's event horizon
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I Follow-up on Index notation for inverse Lorentz transform
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I Canonical energy momentum tensor: Quick question
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I Embedding Diagram of Weyl Metric in ##R^3##
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I Higgs Field & GR: Are They Related or Not?
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B Calculating Time taken to reach speed with Time Dilation
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I How does an arbitrary choice of the origin affect real observations?
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I Asteroid hits static black hole
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A Overall perturbation for two free-falling particles in flat spacetime
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I Does everything move at the speed of light?
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B What is the relationship between speed and time dilation in special relativity?
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I How Can Tensors Be Evaluated to Scalars?
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B Pole-barn paradox, one question
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B Is Time Travel Possible Near Black Holes?
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B What Are Closed Timelike Curves and Common Misunderstandings About Them?
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B What is the essence of the ladder paradox in relativity?
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I Researchers calculate how much faster time passes on the Moon
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B How far away can a World So Newly Born Be at relativistic velocities?
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B Speed of light seen by a moving observer
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A Show Lagrangian is invariant under a Lorentz transformation without using generators
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A Kerr to Schwarzschild to white transition
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I Proof of Lorentz transformation
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I Questions about a thought experiment involving time dilation
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I Why can coefficient "a" between spacetime intervals depend on velocity between systems?
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I Is Measuring the One-Way Speed of Light Possible Near a Black Hole?
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I Black hole and singularity
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A What kind of topology change does this Lorentzian metric describe?
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I General relativity question: Gravity clock
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I Formulating the Poincare group and its double cover
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I Geodesics in Schwarzschild: Reparametrizing the Equations
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B Very simple exercises in General Relativity
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I On the possibility of exploding a black hole
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Basic questions about E=mc^2 energy conversion
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I Do black holes have magnetic fields?
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I SR-time dilation vs GR-time dilation on rotating Earth
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I Affine parameter and non-geodesic null curves
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I Where is the mistake in this derivation of Length Contraction?
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A Energy-to-angular momentum ratio in EM v. gravity quadrupole radiation
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A Quadrupole radiation formula for gravity
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I Special relativity & Synchronization of clocks
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I Frame fields and congruences of worldlines
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I Lorentz invariance of the 4-momentum
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B Would an object in orbit change facing or orientation?
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A A very peculiar emergent definition of gravity
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I The uniqueness of D=4
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I Why do objects follow a geodesic?
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I Increase in surface charge density in different frames of reference
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B General relativity and frame of reference
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I Line element in Kerr coordinates at singularity
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I Trying to Fully Understand Mass Increase of Unstable Bonds
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