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.
Undergrad Solution To Photon Trajectory Equation
  • LazyPhysicist1
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Graduate How to show spin ##= \pm 2/\omega## for a circ-polarized gravity wave
  • Kostik
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Undergrad Inertial reference frame and Bondi k-calculus
  • cianfa72
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Undergrad Regarding centrifugal effects on the time dilation of a moving clock
  • tade
  • · Replies 27 ·
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Undergrad A question about Curved Spaces: Gauss and Riemann (Einstein Gravity in a Nutshell by Zee)
  • Keita
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Graduate Stationary solutions to Klein Gordon equation in spherical symmetry
  • Clvrhammer
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Graduate Exact meaning of the mass M in the Kerr metric event horizon formula?
  • Scott92
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Undergrad Handshake paradox involving the Starship Enterprise
  • ilario980
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Graduate Metric of the "space" of 3d rotations
  • pervect
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Undergrad Spatial homogeneity condition for a free particle Lagrangian
  • cianfa72
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Undergrad Comparing Tick rates of clocks across Frames
  • james fairclear
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Undergrad What causes an accelerated clock to record less events
  • james fairclear
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Undergrad Symmetrical acceleration of Synchronised clocks
  • james fairclear
  • · Replies 21 ·
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Undergrad Doppler effect in transparent media and the index of refraction
  • member 743765
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Undergrad Spaceship drive using symmetrical frame dragging?
  • Valerian_cincon
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High School Can the same ruler have two different sizes?
  • geebor
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Undergrad Can Propeller Speeds and Wave Breaks Challenge the Speed of Light?
  • PRH
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Graduate Making sense of Dirac's rotation operator in "General Theory of Relativity"
  • Kostik
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Undergrad Derivative w.r.t. time of relative position in special relativity
  • MrBlank
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Undergrad How Can I Get Published Without an Endorsement?
  • Jim Fern
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Graduate Inferring coordinate change from the form of the metric
  • Kostik
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High School Can We Use Space/Time Fabric to See the Past?
  • mgsullivan24
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Graduate Merging timelike and spacelike surfaces
  • codebpr
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Graduate Can gravitational energy be localized in the case of plane waves?
  • Kostik
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Undergrad Series Expansion of the Infinitesimal Spacetime Interval
  • Sciencemaster
  • · Replies 22 ·
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Undergrad Understanding the Equivalence Principle
  • Sagittarius A-Star
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Graduate New Adler book on GR: Why do these coefficients go to zero?
  • peasg
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Undergrad How can the Universe know when you change directions?
  • jnhrtmn
  • · Replies 42 ·
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Undergrad Two or more gravitational lenses perfectly aligned with Earth?
  • zuz
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Undergrad Reflections on Relativity web pages broken at mathpages.com
  • m4r35n357
  • · Replies 10 ·
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High School Is this an Unavoidable Collision between 2 spaceships traveling at 0.6c each?
  • Acodato
  • · Replies 34 ·
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Undergrad What Is the Radius of Curvature of Space on Earth's Surface Due to Its Mass?
  • Jaime Rudas
  • · Replies 37 ·
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Undergrad What Experiments Demonstrate Time Dilation?
  • narrator
  • · Replies 46 ·
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High School What if we use a non physical reference point to measure an object's mass?
  • Malemsana
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High School Speed vs. time for our Galaxy and an Observer
  • zuz
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Graduate Quantum mechanics and frame dragging
  • kelly0303
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Undergrad Fermi-Walker transport of proper acceleration along timelike congruence
  • cianfa72
  • · Replies 16 ·
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Undergrad Mother of all equations for the Lorentz force
  • Jaaanosik
  • · Replies 16 ·
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Undergrad Properties of Born rigid congruence
  • cianfa72
  • · Replies 158 ·
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Undergrad Muon travel distance vs Atmosphere Thickness?
  • curiousburke
  • · Replies 50 ·
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High School Which term of the Einstein equation is larger?
  • exponent137
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Undergrad Can there be a maximum curvature of spacetime?
  • HansH
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Graduate Does deceleration cause linear frame dragging?
  • e2m2a
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Undergrad For a relativistic spaceship, what is the most recent news the ship gets from Earth?
  • Albertgauss
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Graduate Where Can I Find Detailed Derivation of Teleparallel Gravity Field Equations?
  • ShivamM
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Undergrad Bell's Spaceship Paradox, Born Rigidity, and the 1-Way Speed of Light
  • Freixas
  • · Replies 47 ·
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Undergrad Is there a gravitational effect on spatial measurements
  • DaTario
  • · Replies 18 ·
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Undergrad How can the volume of a star be determined?
  • Rick16
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Graduate On the order of indices of the Christoffel symbol of the 1st kind
  • ric peregrino
  • · Replies 19 ·
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Undergrad Deriving e=mc^2, how is it possible?
  • rupcha
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High School In GR gravity, does "equal and opposite" still hold and what does that mean?
  • FactChecker
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Undergrad I want a good reference to a discussion of the meaning of "the speed of light is constant"
  • gnnmartin
  • · Replies 60 ·
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Undergrad Potential Energy in a Stretched String in SR
  • LarryS
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Undergrad Correct Description of Black Hole Interior
  • Onyx
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High School Is crossing a black hole's event horizon possible?
  • physicurious
  • · Replies 46 ·
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Undergrad How Does Mass Influence Spacetime Curvature?
  • bkelly13
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High School How fast are gravitational forces transmitted?
  • maxelcat
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Undergrad GPS system and general relativity
  • cianfa72
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High School Why do people care about vacuum solutions in GR?
  • ohwilleke
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Undergrad One-Way Speed of Light: Is it Possible?
  • kochanskij
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Undergrad Question about Two Clocks in this Relativity scenario
  • ultramarinus_regis_8
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High School A question about quarks and black holes
  • Ignorantsmith12
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High School Questions about space and matter
  • Twinduck
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Undergrad Why does general relativity break down at high energies?
  • KleinMoretti
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Graduate Can an imminent laser strike ever be observable?
  • davidjoe
  • · Replies 102 ·
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Undergrad Bell's spaceship paradox unknown? Interpretation?
  • rupcha
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High School Does Relativity Impact Gravity's Influence on Fast-Moving Objects?
  • pete94857
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Undergrad Why Is the Invariant Interval True for All Values of s?
  • PreposterousUniverse
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Undergrad Twin Paradox - difference between outbound and inbound
  • Enovik
  • · Replies 36 ·
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Undergrad I have a question about gravity -- If the value of the energy momentum tensor (Tμν) becomes zero, can it become gravitational-free?
  • seonjunyoo
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Undergrad What if particles are moving near light speed and one slows?
  • Ignorantsmith12
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Undergrad Does Phantom Dark Energy Violate Conservation of Energy?
  • KleinMoretti
  • · Replies 25 ·
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High School What Are Gravitational Waves?
  • PhysicsEnjoyer31415
  • · Replies 7 ·
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Graduate Parallel Transport and Geodesics
  • muhammed yasser raso
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Undergrad Understanding the phrase "simultaneity convention"
  • Freixas
  • · Replies 127 ·
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Undergrad EM Faraday tensor transformation for conductor carrying current
  • cianfa72
  • · Replies 9 ·
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High School E-field of a constant velocity charged particle
  • aliinuur
  • · Replies 35 ·
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Undergrad Experimental evidence of the existence of an event horizon
  • Bosko
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Undergrad Can “speed of light” distinguish all Timelapse videos from real motion?
  • ESponge2000
  • · Replies 14 ·
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Undergrad Spacetime coordinate smoothness requirement
  • cianfa72
  • · Replies 8 ·
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Undergrad Gallilean v/s Lorentz transformation
  • PhysicsEnjoyer31415
  • · Replies 9 ·
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Undergrad Did the Michelson-Morley Experiment Disprove the Ether Theory?
  • sandip4
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Undergrad Gravitational wave propagation in GR
  • cianfa72
  • · Replies 39 ·
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Undergrad Information transfer between moving bodies - sped up or slowed down?
  • some bloke
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Graduate Dirac "GTR" Eq. 27.11 -- how to show that a boundary term vanishes?
  • Kostik
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Undergrad Does expanding space cause cosmological redshift?
  • p78653
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Undergrad What if one is in 1905 and debating foundational fundamentals?
  • sandip4
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Undergrad Couple questions about time re-scaling function in Birkhoff’s theorem
  • Pencilvester
  • · Replies 7 ·
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High School Formation of a black hole using acceleration
  • Isaac Hart
  • · Replies 14 ·
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Undergrad Proving speed of light constant “c” is the same in all directions?
  • ESponge2000
  • · Replies 11 ·
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Graduate Proof of covariant derivative of spinor
  • baba26
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Undergrad Intra-Universe Wormhole Metrics
  • Onyx
  • · Replies 14 ·
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Undergrad General Relativity and the precession of the perihelion of Mercury
  • cianfa72
  • · Replies 30 ·
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Undergrad Does gravity bend gravitational waves?
  • Bosko
  • · Replies 14 ·
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Undergrad When time is not orthogonal to phi, that means there is a preferred direction in space? How?
  • Pencilvester
  • · Replies 14 ·
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Undergrad Basic Special Relativity question but the math isn’t working
  • ESponge2000
  • · Replies 17 ·
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Undergrad Are gravitons necessary?
  • KevinMcHugh
  • · Replies 18 ·
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Graduate Proving that Levi-Civita tensor density is invariant
  • baba26
  • · Replies 3 ·
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Undergrad Can you indeed rescue a person from a Black Hole?
  • DuckAmuck
  • · Replies 7 ·
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Graduate Relativity: Test charge moving perpendicular to a current carrying wire exhibits a force
  • Glare
  • · Replies 7 ·
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