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
High School Can Time Dilation Affect the Mechanical Functioning of a Clock in Orbit?
- ISamson
- · Replies 17 ·
Undergrad Electric currents and length contraction
- Luis Babboni
- · Replies 2 ·
Undergrad Why transformed E and B are asymmetric?
- Luis Babboni
- · Replies 8 ·
Undergrad Understanding the Einstein Equivalence Principle
- Frank Castle
- · Replies 4 ·
Undergrad Gravitational field seen be relativistic particle
- friend
- · Replies 1 ·
Undergrad Velocity measurement by a stationary observer in GR
- sergiokapone
- · Replies 46 ·
Undergrad Lie Derivatives vs Parallel Transport
- Silviu
- · Replies 7 ·
High School How does relativity of simultaneity lead to time dilation?
- Andrew1955
- · Replies 75 ·
Undergrad Demonstration of time dilation
- fab13
- · Replies 21 ·
High School Does Lorentz invariance rule out time travel to the past?
- John Fennie
- · Replies 9 ·
Undergrad Why do particles move along longest proper time trajectories
- Bas73
- · Replies 42 ·
Graduate Complex components of stress-energy tensor
- xpet
- · Replies 3 ·
Undergrad Electrical Current Repelling Magnets Due to Relativity
- Cardinalmont
- · Replies 8 ·
Undergrad Clock hypothesis, gravity time dilation and Equivalence Principle
- BilboBaggins2
- · Replies 60 ·
High School Visual effects of light travel in Journey to the Edge of the Universe
- Randal Smith
- · Replies 7 ·
High School Can you synchronize clocks that are already in relative motion?
- exmarine
- · Replies 2 ·
Undergrad Nearly Lorentz Coordinate Systems: Is h a Tensor?
- Silviu
- · Replies 2 ·
Undergrad Finding Covariant and Contravariant components of Cylin Coor
- thusidie
- · Replies 3 ·
Graduate Was LIGO's gravitational wave detection a false signal from noise?
- auou
- · Replies 117 ·
High School Gravity and how does the surface get it ?
- mr1batman
- · Replies 2 ·
Graduate Mystery of Einstein's Relativity Solved with Classical Physics
- vin300
- · Replies 3 ·
Undergrad Minkowski metric beyond the event horizon
- disregardthat
- · Replies 32 ·
Undergrad Incompleteness of geodesics as ##t \longrightarrow 0##
- Tio Barnabe
- · Replies 8 ·
Undergrad Going from Galilei to Minkowski
- Harry83
- · Replies 21 ·
High School Do Objects in Motion Create Gravitational Waves?
- Ross B
- · Replies 50 ·
Undergrad Calculate Time at Infinity for GR Observer: A Photon's Journey
- Kara386
- · Replies 5 ·
High School 2 clocks -- Using orthogonal light path detectors in a space ship
- Ross B
- · Replies 33 ·
Undergrad Geodesic Deviation in Static Spacetime: Flat Geometry
- timmdeeg
- · Replies 5 ·
Undergrad How is a vector a directional derivative?
- mp6250
- · Replies 10 ·
Undergrad Tidal forces on ball bearings in an accelerating railway coach
- Whitehole
- · Replies 13 ·
Undergrad Singularities in General Relativity
- Tio Barnabe
- · Replies 12 ·
Undergrad Could varying Planck length across regions break homogeneity of space?
- weezy
- · Replies 1 ·
Undergrad Can Christoffel symbols be moved inside partial derivatives?
- whatisreality
- · Replies 2 ·
High School Effect of reaching the speed of light
- marmstrong941
- · Replies 21 ·
Undergrad How to find neutron star masses and distance from LIGO gravity wave signals
- jordankonisky
- · Replies 7 ·
Undergrad Relativistic field of moving charge. Why is it symmetric?
- Luis Babboni
- · Replies 2 ·
Undergrad Can't understand this argument for Lorentz transformation y'=y
- Happiness
- · Replies 15 ·
High School What (if anything) limits the speed of something falling into a black hole?
- jerromyjon
- · Replies 56 ·
High School Why can't we weigh a stationary electron?
- itoero
- · Replies 81 ·
Undergrad Maxwell's equations as differential forms in (2+1)D
- Silviu
- · Replies 2 ·
Undergrad Does T^00 include gravitational potential energy in the stress-energy tensor?
- Silviu
- · Replies 2 ·
High School Can General Relativity and Quantum Field Theory Be Reconciled?
- Megaton
- · Replies 3 ·
Undergrad Finding distance in polar coordinates with metric tensor
- thusidie
- · Replies 9 ·
Undergrad Speed of gravity vs. speed of light
- exponent137
- · Replies 7 ·
Undergrad Relativistic Mass Calculation with 4th Dimensional Vector
- afeser
- · Replies 9 ·
Undergrad Contradiction between two fundamentals
- commander_24
- · Replies 1 ·
Undergrad Torsion & Non-Closed Rectangle in Feynman & Penrose
- Sonderval
- · Replies 7 ·
Undergrad Length contraction in a spinning disk and the equivalence principle
- Sorcerer
- · Replies 8 ·
Undergrad Theorem Proved: Universal Speed C in SR?
- andrew s 1905
- · Replies 2 ·
Graduate Can Weyl Tensor Look Like Negative Mass?
- gnnmartin
- · Replies 10 ·
High School Speed of light and modern physics
- commander_24
- · Replies 2 ·
Undergrad How do I apply weak field approximation to the Einstein field equation?
- Das apashanka
- · Replies 1 ·
Undergrad Why must the spacetime we inhabit be a geodesically complete manifold?
- Pencilvester
- · Replies 14 ·
High School According to General Relativity, would the Earth be 'flat'?
- AstralSentient
- · Replies 25 ·
Undergrad Why does weak field imply inequalities for stress-energy and metric perturbations?
- Silviu
- · Replies 3 ·
High School Is Light Traveling Through Time?
- Physicsislifetome
- · Replies 5 ·
High School Time Dilation: Moving Rocket 0.5c vs Accelerating Rocket 0.5c
- pavelbure9
- · Replies 4 ·
Undergrad Where Did LIGO Find Merging Black Holes?
- Albertgauss
- · Replies 3 ·
Undergrad Gravitational Wave Modeling: A Thought Experiment
- Jim Lundquist
- · Replies 6 ·
Undergrad Proof of the variation of the determinant of the metric
- Das apashanka
- · Replies 3 ·
Undergrad Why is the Lagrangian density for gravity the Ricci scalar?
- Das apashanka
- · Replies 2 ·
High School Volumes and Hyper Volumes Related Special Relativity
- Sasha Jaffarove
- · Replies 1 ·
Undergrad Gradient in the rate of time vs acceleration
- synch
- · Replies 13 ·
Graduate Why does the metric tensor Taylor expansion have g_ij(tx) instead of g_ij(x)?
- mertcan
- · Replies 4 ·
Undergrad How do you calculate the time component of a 4-Vector
- Philosophaie
- · Replies 6 ·
High School Gravitational waves and "warp drive"
- jerromyjon
- · Replies 1 ·
Undergrad EM Force vs. Gravity: Modeling Spatio-Temporal Curvature
- Ontophobe
- · Replies 5 ·
High School How is light influenced really close to the event horizon?
- MisterMuoN
- · Replies 11 ·
Graduate Calculating Ricci tensor in AdS space
- HamOnRye
- · Replies 8 ·
High School Is Einstein's explanation of gravity just a geometrical replacement?
- menniandscience
- · Replies 8 ·
High School Transforming Relativistic Kinetic Energy: A Concise Mathematical Trick
- quiet
- · Replies 7 ·
Undergrad Initial conditions for Schwarzschild test particle with v₀=0.999c at photon sphere
- Yukterez
- · Replies 55 ·
High School Faraday's disk and "absolute" magnetic fields
- Buckethead
- · Replies 128 ·
High School Einstein Proven Right by 2017 Eclipse? Investigation
- smodak
- · Replies 5 ·
Undergrad Shape of Vacuum Space: Constant Spatial Volume with Time
- TGlad
- · Replies 9 ·
Undergrad LIGO and light speed constancy
- ewq
- · Replies 118 ·
High School Do Gravitational Waves Always Travel at the Speed of Light?
- calinvass
- · Replies 13 ·
Graduate Does the inverse square law hold indefinitely for gravity?
- Jake Banner
- · Replies 2 ·
Undergrad Are Local Lorentz Transformations Possible with Varying ##\vec{x}##?
- Tio Barnabe
- · Replies 4 ·
Undergrad Are Electric and Gravitational Fields Different for Moving Objects?
- Silviu
- · Replies 5 ·
Undergrad Speed of light on a moving platform
- jay t
- · Replies 86 ·
High School Relative Rotation: Physics Approach for Newton's Bucket in Empty Universe
- Alfredo Tifi
- · Replies 5 ·
Undergrad Stress Energy Tensor: How Does It Implicate Flow of Energy?
- Silviu
- · Replies 6 ·
High School Postulates of General Relativity
- Jimmy87
- · Replies 17 ·
Undergrad Can two gravitational waves orbit each other?
- friend
- · Replies 11 ·
Undergrad Positive Charge Magnetic Fields: Real World Examples
- Windadct
- · Replies 5 ·
Graduate Black Hole Merger: Analytical or Numerical Solutions?
- sandy stone
- · Replies 9 ·
Undergrad Velocity Addition Formula: u_y > c?
- D O
- · Replies 2 ·
Undergrad Unexpected result on Lorentz transformation
- Tio Barnabe
- · Replies 2 ·
Undergrad Understanding Stress Energy Tensor of Fluids
- Silviu
- · Replies 13 ·
Undergrad Raising tensor indices: order of matrix multiplication for t^AB
- SiennaTheGr8
- · Replies 1 ·
Undergrad Does Feynman's Work on Gravitons Clarify Quantum Gravity?
- TensorAndTensor
- · Replies 1 ·
Graduate Derive the Bianchi identities from a variational principle?
- Gio83
- · Replies 2 ·
High School What does the negative solution mean when solving for c in E=mc²?
- Joshua514
- · Replies 11 ·
High School Concept of the stability of the speed of light
- Graham P
- · Replies 7 ·
High School Can Relativity Theories Actually Permit Faster-Than-Light Travel?
- Citizen247
- · Replies 6 ·
Undergrad Pressure term in the energy stress tensor
- Ron19932017
- · Replies 9 ·
High School How does relativistic mass manifest to an observer?
- Involute
- · Replies 28 ·
Undergrad How does Einstein define simultaneity in his 1905 paper?
- Aufbauwerk 2045
- · Replies 62 ·
Undergrad Why are there many Ricci-flat topologies but few exact vacuum solutions?
- TGlad
- · Replies 3 ·