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.
B Formation of a black hole using acceleration
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I Proving speed of light constant “c” is the same in all directions?
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A Proof of covariant derivative of spinor
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I Intra-Universe Wormhole Metrics
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I General Relativity and the precession of the perihelion of Mercury
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I Does gravity bend gravitational waves?
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I When time is not orthogonal to phi, that means there is a preferred direction in space? How?
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I Basic Special Relativity question but the math isn’t working
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I Are gravitons necessary?
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A Proving that Levi-Civita tensor density is invariant
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I Can you indeed rescue a person from a Black Hole?
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A Relativity: Test charge moving perpendicular to a current carrying wire exhibits a force
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B How to intuitively understand the formula S² = x² - c²t²
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I Why isn't TT gauge over constrained?
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I Minkowski to Euclidean line element from coordinate changes?
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A Diffeo-invariant action for a matter covector field
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I Final part of proof of timelike Killing w/ Frobenius --> static
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I Einstein field equations
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I Online Christoffel Symbols Calculator
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B Question about bendability of objects in 4 dimensions
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I A question about Relativity of Time using Time dilation experiment
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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 What Would the Universe Look Like as a 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 Why Does a Charged Box Exhibit Higher Inertia Due to Mass-Energy Equivalence?
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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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