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.
Threads
Undergrad Trying to Fully Understand Mass Increase of Unstable Bonds
- Ascendant0
- · Replies 8 ·
Undergrad Why does a(V) depend only on speed, not direction, in Landau & Lifshitz proof?
- tx_kurt
- · Replies 10 ·
High School Nalini Joshi's Time Travel Ideas
- Tomwh98
- · Replies 2 ·
Undergrad Constants of motion symmetric spacetimes
- cianfa72
- · Replies 9 ·
Undergrad Speed of information-carrying radiation
- Speady
- · Replies 9 ·
Graduate Zeroth law of black hole thermodynamics
- Antarres
- · Replies 9 ·
Undergrad Is Spacetime a Real Physical Entity or Merely a Conceptual Framework in Physics?
- Michael Ray Mooney
- · Replies 4 ·
Undergrad Quaternions and Special Relativity
- grzz
- · Replies 20 ·
Undergrad Escape velocity near a black hole with special relativity
- Trollfaz
- · Replies 17 ·
Undergrad Sagan's 56-year universe circumnavigation at 1g acceleration
- bob012345
- · Replies 21 ·
Undergrad Definition of time-independent scalar field in GR
- Clvrhammer
- · Replies 4 ·
Undergrad Congruence of curves in spacetime
- cianfa72
- · Replies 23 ·
Undergrad Distance between two light pulses
- member 743765
- · Replies 4 ·
Graduate Timelike curves on event horizon
- Antarres
- · Replies 7 ·
Undergrad Solution To Photon Trajectory Equation
- LazyPhysicist1
- · Replies 10 ·
Graduate How to show spin ##= \pm 2/\omega## for a circ-polarized gravity wave
- Kostik
- · Replies 0 ·
Undergrad Inertial reference frame and Bondi k-calculus
- cianfa72
- · Replies 7 ·
Undergrad Regarding centrifugal effects on the time dilation of a moving clock
- tade
- · Replies 27 ·
Undergrad Coordinate transformation formula in Zee's Einstein Gravity
- Keita
- · Replies 11 ·
Graduate Stationary solutions to Klein Gordon equation in spherical symmetry
- Clvrhammer
- · Replies 9 ·
Graduate Exact meaning of the mass M in the Kerr metric event horizon formula?
- Scott92
- · Replies 4 ·
Undergrad Handshake paradox involving the Starship Enterprise
- ilario980
- · Replies 34 ·
Graduate Metric of the "space" of 3d rotations
- pervect
- · Replies 4 ·
Undergrad Spatial homogeneity condition for a free particle Lagrangian
- cianfa72
- · Replies 48 ·
Undergrad Why accelerated clocks show different tick rates in different frames
- james fairclear
- · Replies 23 ·
Undergrad What causes an accelerated clock to record less events
- james fairclear
- · Replies 8 ·
Undergrad Symmetrical acceleration of Synchronised clocks
- james fairclear
- · Replies 21 ·
Undergrad Doppler effect in transparent media and the index of refraction
- member 743765
- · Replies 11 ·
Undergrad Spaceship drive using symmetrical frame dragging?
- Valerian_cincon
- · Replies 25 ·
High School Can the same ruler have two different sizes?
- geebor
- · Replies 14 ·
Undergrad Can Propeller Speeds and Wave Breaks Challenge the Speed of Light?
- PRH
- · Replies 13 ·
Graduate Making sense of Dirac's rotation operator in "General Theory of Relativity"
- Kostik
- · Replies 30 ·
Undergrad Derivative w.r.t. time of relative position in special relativity
- MrBlank
- · Replies 8 ·
Undergrad How Can I Get Published Without an Endorsement?
- Jim Fern
- · Replies 7 ·
Graduate Inferring coordinate change from the form of the metric
- Kostik
- · Replies 10 ·
High School Can We Use Space/Time Fabric to See the Past?
- mgsullivan24
- · Replies 5 ·
Graduate Merging timelike and spacelike surfaces
- codebpr
- · Replies 0 ·
Graduate Can gravitational energy be localized in the case of plane waves?
- Kostik
- · Replies 8 ·
Undergrad Series Expansion of the Infinitesimal Spacetime Interval
- Sciencemaster
- · Replies 22 ·
Undergrad Does Macdonald's sphere calculation violate the equivalence principle?
- Sagittarius A-Star
- · Replies 10 ·
Graduate New Adler book on GR: Why do these coefficients go to zero?
- peasg
- · Replies 2 ·
Undergrad How can the Universe know when you change directions?
- jnhrtmn
- · Replies 42 ·
Undergrad Two or more gravitational lenses perfectly aligned with Earth?
- zuz
- · Replies 2 ·
Undergrad Mathpages.com relativity links appear broken
- m4r35n357
- · Replies 10 ·
High School Is this an Unavoidable Collision between 2 spaceships traveling at 0.6c each?
- Acodato
- · Replies 34 ·
Undergrad What Is the Radius of Curvature of Space on Earth's Surface Due to Its Mass?
- Jaime Rudas
- · Replies 37 ·
Undergrad What Experiments Demonstrate Time Dilation?
- narrator
- · Replies 46 ·
High School What if we use a non physical reference point to measure an object's mass?
- Malemsana
- · Replies 5 ·
High School Speed vs. time for our Galaxy and an Observer
- zuz
- · Replies 3 ·
Graduate Quantum mechanics and frame dragging
- kelly0303
- · Replies 21 ·
Undergrad Fermi-Walker transport of proper acceleration along timelike congruence
- cianfa72
- · Replies 16 ·
Undergrad Mother of all equations for the Lorentz force
- Jaaanosik
- · Replies 16 ·
Undergrad Properties of Born rigid congruence
- cianfa72
- · Replies 158 ·
Undergrad Muon travel distance vs Atmosphere Thickness?
- curiousburke
- · Replies 50 ·
High School Which term of the Einstein equation is larger?
- exponent137
- · Replies 8 ·
Undergrad Can there be a maximum curvature of spacetime?
- HansH
- · Replies 9 ·
Graduate Does deceleration cause linear frame dragging?
- e2m2a
- · Replies 26 ·
Undergrad For a relativistic spaceship, what is the most recent news the ship gets from Earth?
- Albertgauss
- · Replies 6 ·
Graduate Where Can I Find Detailed Derivation of Teleparallel Gravity Field Equations?
- ShivamM
- · Replies 12 ·
Undergrad Bell's Spaceship Paradox, Born Rigidity, and the 1-Way Speed of Light
- Freixas
- · Replies 47 ·
Undergrad Is there a gravitational effect on spatial measurements
- DaTario
- · Replies 18 ·
Undergrad How can the volume of a star be determined?
- Rick16
- · Replies 10 ·
Graduate On the order of indices of the Christoffel symbol of the 1st kind
- ric peregrino
- · Replies 19 ·
Undergrad Deriving e=mc^2, how is it possible?
- rupcha
- · Replies 2 ·
High School In GR gravity, does "equal and opposite" still hold and what does that mean?
- FactChecker
- · Replies 12 ·
Undergrad I want a good reference to a discussion of the meaning of "the speed of light is constant"
- gnnmartin
- · Replies 60 ·
Undergrad Potential Energy in a Stretched String in SR
- LarryS
- · Replies 4 ·
Undergrad Correct Description of Black Hole Interior
- Onyx
- · Replies 24 ·
High School Is crossing a black hole's event horizon possible?
- physicurious
- · Replies 46 ·
Undergrad How Does Mass Influence Spacetime Curvature?
- bkelly13
- · Replies 13 ·
High School How fast are gravitational forces transmitted?
- maxelcat
- · Replies 33 ·
Undergrad GPS system and general relativity
- cianfa72
- · Replies 103 ·
High School Why do people care about vacuum solutions in GR?
- ohwilleke
- · Replies 9 ·
Undergrad Can the one-way speed of light be measured or is it underdetermined?
- kochanskij
- · Replies 53 ·
Undergrad Measuring t=0 with two clocks at rest in general relativity
- ultramarinus_regis_8
- · Replies 10 ·
High School Do black holes create new quark pairs from the strong nuclear force?
- Ignorantsmith12
- · Replies 12 ·
High School Questions about space and matter
- Twinduck
- · Replies 34 ·
Undergrad Why does general relativity break down at high energies?
- KleinMoretti
- · Replies 8 ·
Graduate Can an imminent laser strike ever be observable?
- davidjoe
- · Replies 102 ·
Undergrad Bell's spaceship paradox unknown? Interpretation?
- rupcha
- · Replies 20 ·
High School Does Relativity Impact Gravity's Influence on Fast-Moving Objects?
- pete94857
- · Replies 2 ·
Undergrad Why Is the Invariant Interval True for All Values of s?
- PreposterousUniverse
- · Replies 14 ·
Undergrad Twin Paradox - difference between outbound and inbound
- Enovik
- · Replies 36 ·
Undergrad I have a question about gravity -- If the value of the energy momentum tensor (Tμν) becomes zero, can it become gravitational-free?
- seonjunyoo
- · Replies 4 ·
Undergrad What if particles are moving near light speed and one slows?
- Ignorantsmith12
- · Replies 9 ·
Undergrad Does Phantom Dark Energy Violate Conservation of Energy?
- KleinMoretti
- · Replies 25 ·
High School What Are Gravitational Waves?
- PhysicsEnjoyer31415
- · Replies 7 ·
Graduate Can arbitrary tensors be parallel transported along any curve?
- muhammed yasser raso
- · Replies 6 ·
Undergrad How arbitrary can simultaneity conventions be in special relativity?
- Freixas
- · Replies 127 ·
Undergrad EM Faraday tensor transformation for conductor carrying current
- cianfa72
- · Replies 9 ·
High School E-field of a constant velocity charged particle
- aliinuur
- · Replies 35 ·
Undergrad Is there experimental evidence for event horizons?
- Bosko
- · Replies 4 ·
Undergrad Can “speed of light” distinguish all Timelapse videos from real motion?
- ESponge2000
- · Replies 14 ·
Undergrad Spacetime coordinate smoothness requirement
- cianfa72
- · Replies 8 ·
Undergrad Gallilean v/s Lorentz transformation
- PhysicsEnjoyer31415
- · Replies 9 ·
Undergrad Did the Michelson-Morley Experiment Disprove the Ether Theory?
- sandip4
- · Replies 5 ·
Undergrad Gravitational wave propagation in GR
- cianfa72
- · Replies 39 ·
Undergrad Information transfer between moving bodies - sped up or slowed down?
- some bloke
- · Replies 2 ·
Graduate Dirac "GTR" Eq. 27.11 -- how to show that a boundary term vanishes?
- Kostik
- · Replies 4 ·
Undergrad Does expanding space cause cosmological redshift?
- p78653
- · Replies 3 ·