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 How can I derive the law of composition of velocities?
- AhmedHesham
- · Replies 14 ·
Graduate Who Was Right - Poincare, Einstein or Neither
- bhobba
- · Replies 42 ·
Undergrad Lorentz Transformation Matrix: Tensor of Order 2?
- Ben Geoffrey
- · Replies 5 ·
Undergrad Some geometry questions re Schwarzschild metric
- Buzz Bloom
- · Replies 13 ·
High School Mass and Time Dilation: Causes and Effects
- fishin_kitten
- · Replies 7 ·
Graduate Riemannian Geometry: GR & Importance Summary
- binbagsss
- · Replies 3 ·
Graduate Prove 2-D Lorentzian Metric is Locally Equivalent to Standard Form
- Pentaquark5
- · Replies 9 ·
High School Why can't light travel faster than c?
- Aarav
- · Replies 52 ·
Undergrad Black Hole Radiation: Questions Clarified
- arlesterc
- · Replies 34 ·
Undergrad Theory of Acceleration: Is There a Limit?
- ObjectivelyRational
- · Replies 8 ·
Undergrad Find Solutions to Helical Worldline's Surfaces of Simultaneity
- Pencilvester
- · Replies 6 ·
Undergrad Weight of a relativistic particle
- superdave
- · Replies 83 ·
Undergrad Why is the conservation of electric charge expressed in the continuity equation?
- Tom Evans
- · Replies 13 ·
Graduate Compute Commutator of Covariant Derivative & D/ds on Vector Fields
- Pentaquark6
- · Replies 5 ·
High School Newton's Law of Gravitation: Balancing Centrifugal Force & Internal Pressure
- Osvaldo
- · Replies 5 ·
Undergrad Delta Notation in GR: Replacing vs Raising/Lowering
- binbagsss
- · Replies 2 ·
Undergrad De Sitter Universe: Divergent Parallel Lines?
- dagmar
- · Replies 3 ·
Undergrad Light From Black Holes: GR vs QM
- kent davidge
- · Replies 4 ·
Undergrad Event Horizons - Holographic Principle
- .Scott
- · Replies 20 ·
High School Lag of a clock coming back to its initial position (Twins Paradox)
- Aleberto69
- · Replies 44 ·
Graduate Dark Matter, Energy-Momentum Tensor & Galaxies
- e2m2a
- · Replies 6 ·
Undergrad Latest Gamma Ray Burst Experimental results
- Azurite
- · Replies 49 ·
Undergrad Can anyone help me understand the Equivalence Principle
- LSMOG
- · Replies 10 ·
Undergrad Metric Measurements: Explaining dx vs adx
- exmarine
- · Replies 10 ·
Undergrad Black hole event horizon confusion
- mattjbr2
- · Replies 57 ·
High School Gravitational Lensing: Gravity's Effect on Light
- Rigel84
- · Replies 11 ·
High School Why do we Experience a 'Flow' of Time?
- TheQuestionGuy14
- · Replies 106 ·
High School Gravity & Mass: Acceleration, Force & Basics Explained
- jordankonisky
- · Replies 4 ·
Undergrad Deflection of Starlight by Newtonian Gravity - Example Calculation
- Henri Garcia
- · Replies 2 ·
Graduate Two Dimensional Ricci curvature
- craigthone
- · Replies 6 ·
Graduate Prove EL Geodesic and Covariant Geodesic Defs are Same via Riemmanian Geometry
- binbagsss
- · Replies 6 ·
High School Velocity of light and absolute rest
- shivakumarvv75
- · Replies 27 ·
High School Is the time dimension more fundamental?
- thermia
- · Replies 34 ·
Graduate Understanding E-Field Transformation in Feynman II_26
- Verne42
- · Replies 12 ·
Undergrad How can General Relativity explain the Moon drifting apart from Earth
- DLeuPel
- · Replies 6 ·
Graduate Schwarzschild Derivation: Sean Carroll Notes - Theorem Name?
- binbagsss
- · Replies 1 ·
Undergrad Understanding Length Contraction: What is Limit of Vanishing Transport Velocity?
- Philip Dhingra
- · Replies 6 ·
Undergrad Thermodynamics of Black Holes: Analyzing Carnot Cycles
- PeteSampras
- · Replies 1 ·
Undergrad Are spherically symmetric and isotropic the same
- binbagsss
- · Replies 9 ·
Graduate Lense-Thirring effect - General Relativity
- Pentaquark5
- · Replies 12 ·
Graduate Constant along a geodesic vs covariantly constant
- binbagsss
- · Replies 3 ·
High School Light (not) escaping from black holes
- Outhouse
- · Replies 53 ·
High School Proving Proper Time of Photon in Friedman Metric
- exmarine
- · Replies 2 ·
High School Time Travel & Causality in General Relativity
- TheQuestionGuy14
- · Replies 30 ·
Undergrad FRW metric derivation: constraints from isotropic and homoge
- binbagsss
- · Replies 7 ·
High School Launch Spacecraft to Near c Speeds: Is it Possible?
- kolleamm
- · Replies 15 ·
High School If you condense an atom, would it make a black hole?
- Carobouy
- · Replies 7 ·
Graduate Why Scalar Quantities Matter in Singularity Tests
- binbagsss
- · Replies 5 ·
Undergrad Transforming to Local Inertial Coordinates
- Ibix
- · Replies 5 ·
Undergrad Demonstration of relation between geodesics and FLRW metric
- fab13
- · Replies 3 ·
Undergrad Mass of Bound Particles & Mass-Energy Equivalence
- Gene Naden
- · Replies 9 ·
High School Relative speed and time dilation
- dayalanand roy
- · Replies 34 ·
High School How Does the Twin Paradox Affect Aging?
- Daniepie
- · Replies 44 ·
Undergrad Gravity Inside and Outside a Moving Lift
- Sandeep T S
- · Replies 9 ·
Undergrad Angular Velocity: Can a Body Move Faster Than C?
- Sandeep T S
- · Replies 6 ·
Undergrad Communicating with Black Hole Time Warp: A to B and Back Again
- RajatX
- · Replies 2 ·
Undergrad Is the Scientific American Article on the Twin Paradox Accurate?
- Sorcerer
- · Replies 7 ·
High School Rest Frame in GTR: What Is It?
- Sandeep T S
- · Replies 3 ·
Graduate Inverse of infinitesimal Lorentz transformation
- Gene Naden
- · Replies 5 ·
Undergrad Relativistic Energy Dispersion Relation: Explained
- Parcival
- · Replies 10 ·
Undergrad Derivation of E=mc2 from Four-Vector Definitions in Special Relativity
- Ziang
- · Replies 85 ·
High School Einstein's Lift Experiment: The Principle of Equivalence
- Sandeep T S
- · Replies 1 ·
Graduate The inverse of spacetime curvature?
- LilPhysics
- · Replies 12 ·
Undergrad Feynman II, equation 26.11, off by a factor
- learn.steadfast
- · Replies 13 ·
Graduate Alcubierre Drive Direction: How Does Craft Move?
- Davephaelon
- · Replies 4 ·
Undergrad Space Contraction: Does Moving Frame Affect Observation?
- rahaverhma
- · Replies 6 ·
Undergrad Contravariant first index, covariant on second, Vice versa?
- Gene Naden
- · Replies 36 ·
Undergrad Using Black Holes to Time Travel Into the Future
- stevendaryl
- · Replies 56 ·
High School Photons, mass, and black holes
- Philbert1893
- · Replies 26 ·
High School Does Light Phase Change During Travel?
- Bob Dylan
- · Replies 14 ·
Undergrad Derivatives of EM Four-Potential: Euler-Lagrange to $\nabla \times B$
- Gene Naden
- · Replies 3 ·
Graduate Is Gravity a Gauge Theory? A Review of GR and Standard Model Symmetries
- bhobba
- · Replies 17 ·
Undergrad Derivation notation with capital D?
- Emil_M
- · Replies 5 ·
Undergrad Sum Maxwell Lagrangian 1st Term: Use Minus Signs?
- Gene Naden
- · Replies 7 ·
Graduate Interpretation of covariant derivative of a vector field
- Pentaquark5
- · Replies 2 ·
High School Curvature: Intrinsic vs. Extrinsic - What's the Difference?
- vibhuav
- · Replies 9 ·
Undergrad Why do we need a theory to replace the Galilian composition of velocities?
- AhmedHesham
- · Replies 16 ·
Graduate Euler-Lagrange Equations: EM Field Term
- Gene Naden
- · Replies 2 ·
Undergrad Measuring Space Curvature w/ Swarzschild Coordinate System: Q&A
- andrewkirk
- · Replies 3 ·
Undergrad Lorenz Transformation of Time: Explained
- AhmedHesham
- · Replies 5 ·
Graduate SR/GRs Views on QM/QFT | Physics Forums
- VIctor Medvil
- · Replies 3 ·
Undergrad Relativistic Effect on Object Accelerated to 10000-10000m/s^2
- sfsssfefsfe
- · Replies 7 ·
Undergrad Explaining Spacetime Dragging: Gravity, EM & Smooth Objects
- bland
- · Replies 6 ·
High School Curvature of space vs. curvature of spacetime
- Buckethead
- · Replies 52 ·
Undergrad Deriving Divergence Formula in General Relativity
- Pencilvester
- · Replies 4 ·
Graduate Solving Schwarzschild Field Equations in this Form
- bolbteppa
- · Replies 3 ·
High School Inertial and gravitational mass
- Geo
- · Replies 28 ·
Undergrad General Relativity & The Sun: Does it Revolve Around Earth?
- JohnNemo
- · Replies 193 ·
Undergrad Interstellar Travel Without Propulsion or Time Dilation
- Yemmy
- · Replies 11 ·
Undergrad Is force/mass ratio an invariant quantity in GR?
- JohnNemo
- · Replies 7 ·
Undergrad Charged black hole - static electric field lines
- dllahr
- · Replies 14 ·
Undergrad Parabolic Motion from Hyperbolic Motion
- SiennaTheGr8
- · Replies 2 ·
High School Can Electron-Positron Annihilation Reveal Insights About Black Hole Gravity?
- Eric Walker
- · Replies 7 ·
Undergrad Stress–energy pseudotensor of gravitation field for DE
- sergiokapone
- · Replies 2 ·
Graduate Difference Between Event Horizons & Trapped Surfaces - Explained Simply
- Nick Prince
- · Replies 8 ·
Undergrad Sanity Check: Four-Force & Variable Mass
- SiennaTheGr8
- · Replies 13 ·
Graduate Improper and non-orthochronous group
- PRANAV UPADHYAY
- · Replies 1 ·
Undergrad Can I be taught general and special Relativity on this forum
- P J Strydom
- · Replies 70 ·
High School Light Clock Traveling in Z Direction
- sqljunkey
- · Replies 9 ·
High School How can Closed Timelike Curves be made?
- TheQuestionGuy14
- · Replies 1 ·