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 Do Perpendicular Velocities Affect Relative Motion?
- rashida564
- · Replies 1 ·
Undergrad Time Dilation Effects of Travel to Star 10ly Away
- virgil1612
- · Replies 3 ·
High School Is Time Dilation Indicating the Existence of Multiple Times?
- Julius Ceasar
- · Replies 21 ·
Undergrad Special Relativity Controversy: Solving the Paradox
- LukasMont
- · Replies 5 ·
Undergrad The Tensor & Metric: Spacetime Points & Momentum Flux
- dsaun777
- · Replies 17 ·
High School The Fourth Dimension: A Measurement of Aging
- dayalanand roy
- · Replies 20 ·
Undergrad An observer passing the event horizon of a black hole
- DennisN
- · Replies 12 ·
Undergrad Deriving the 4-momentum of a free particle moving in curved spacetime
- jcap
- · Replies 2 ·
Undergrad Time Dilation: Clock A & B Confusion
- Haorong Wu
- · Replies 6 ·
High School Agreeing on relative separations and accelerations
- etotheipi
- · Replies 13 ·
High School Why Does Matter Fall to Center of a Mass? Explained
- Tomer Aman
- · Replies 4 ·
High School Apparent contradiction in time dilation
- Julius Ceasar
- · Replies 15 ·
High School Development of Special Relativity
- NoahsArk
- · Replies 53 ·
High School Time Travel: How Does a Fast Electron Experience Sunrise?
- jefals
- · Replies 41 ·
Undergrad Relativistic Notation in Waves: Confusion Solved
- kent davidge
- · Replies 4 ·
Graduate Lorentz Transformations: Why We Need the Same $\gamma$
- LagrangeEuler
- · Replies 7 ·
High School Relativistic explanation of electromagnetism
- Karl Coryat
- · Replies 34 ·
Undergrad One Way Twin Revisited: Understanding Tim & Tom's Watches on Home & Northbound
- Gordie19
- · Replies 37 ·
Undergrad LIGO Gravitational Wave Detection News
- Wrichik Basu
- · Replies 26 ·
High School SR Thought: Spacetime Interval w/ Bounds of ##0<\alpha<1##
- benorin
- · Replies 4 ·
Undergrad Energy Momentum Tensor: Real Physics & Cosmology
- dsaun777
- · Replies 7 ·
Graduate Heuristic Approach EFE: Why 10 DOF?
- binbagsss
- · Replies 5 ·
Graduate Difference of Christoffel Symbols Transforms as Tensor
- binbagsss
- · Replies 7 ·
High School What Causes Moving Clocks to Measure Slower? Explained
- Grimble
- · Replies 21 ·
Undergrad What Happens When a Planet Nears the Speed of Light Near a Black Hole?
- John SpaceY
- · Replies 64 ·
High School Kinetic Energy of an Object Falling Into an Event Horizon
- Andrew Wright
- · Replies 11 ·
Graduate Solving Shapiro Delay Problem w/ Approximations: Q&A
- exmarine
- · Replies 6 ·
Graduate Can Photon Have Orbital Angular Momentum?
- Physics4Funn
- · Replies 9 ·
Undergrad The Simultaneity Paradox: Investigating Net Rotation of a Balanced Beam
- e2m2a
- · Replies 36 ·
High School Can someone tell me if I got this line from the Feynman lectures right?
- Rishabh Narula
- · Replies 21 ·
Undergrad Speed Difference of Time on Poles vs Equator of Earth and Other Planets
- some bloke
- · Replies 16 ·
High School Gravitational Time Dilation in L1 Point: Summed, Canceled or Else?
- Chris Miller
- · Replies 2 ·
Undergrad About the solution of the parallel transport equation
- Jianbing_Shao
- · Replies 14 ·
Undergrad Four-momentum & four-acceleration in GR - Physics Discussion
- Karl Coryat
- · Replies 6 ·
High School Absolute Time, I know its wrong and all but tell me if I got it right
- Rishabh Narula
- · Replies 9 ·
High School Can Dropping Stuff Challenge Einstein's Relativity Theory?
- jedishrfu
- · Replies 2 ·
High School Misunderstanding of "proper velocity"
- etotheipi
- · Replies 17 ·
Undergrad Does p=mc Apply To Photons? | A.P. French's Special Relativity
- Aaron121
- · Replies 15 ·
Undergrad E=mc^2 Mass: Rest Mass m0 vs Relativistic Mass γm0
- Aaron121
- · Replies 2 ·
High School Would Earth fly off into space if the Sun disappeared?
- Julius Ceasar
- · Replies 33 ·
High School Some questions about the Doppler Effect at high velocities
- neanderthalphysics
- · Replies 9 ·
Graduate Continuity Equation for fluid in a curved spacetime
- aliveone
- · Replies 18 ·
Undergrad What happens in the area between black holes before they collide
- tflahive
- · Replies 69 ·
High School What is Absolute Time and Space?
- Rishabh Narula
- · Replies 5 ·
High School Plotting the Space-Time Continuum: Is it Possible?
- FireAP
- · Replies 5 ·
Undergrad How it's known that the variational principle works for relativity
- kent davidge
- · Replies 25 ·
High School Clarification of Romer's Calculation
- etotheipi
- · Replies 2 ·
High School Question About Lorentz Contraction: Red vs Blue?
- AdirianSoan
- · Replies 4 ·
Graduate Stress-energy tensor of a rotating rod
- Ibix
- · Replies 21 ·
Graduate Birkhoff's theorem with cosmological constant
- pervect
- · Replies 4 ·
Undergrad Deriving AdS Poincare Coordinates from Global Coordinates
- formodular
- · Replies 2 ·
Undergrad Does Gravity Affect Mass Measurement in Flat Spacetime?
- AdirianSoan
- · Replies 11 ·
Graduate Doubt about Energy Condition in Wormhole: Integral Along Null Geodesic
- wLw
- · Replies 22 ·
High School Time Difference for High-Speed Travel: Asymmetric by Special Relativity
- Robert Booth
- · Replies 16 ·
Graduate The derivation of the volume form in Ricci tensor
- bres gres
- · Replies 6 ·
Undergrad Muons Decaying on Mt Washington: Expert Answers
- bugatti79
- · Replies 5 ·
Undergrad Speed of Light in Inertial Ref Frames: Photon Perspective
- Saptarshi Sarkar
- · Replies 4 ·
Undergrad Momentum and energy calculation in special relativity
- liuxinhua
- · Replies 24 ·
Undergrad Metric compatibility? Why is it an additional property?
- George Keeling
- · Replies 6 ·
Undergrad Gravitational Waves: Difficulty Level of Study?
- kent davidge
- · Replies 7 ·
High School Types of Metrics: Background & Reference Explained
- windy miller
- · Replies 2 ·
Graduate Calculating Nabla w V in General Relativity
- bres gres
- · Replies 9 ·
Graduate Time Measurement in MT Traversable Wormholes - Help Needed
- wLw
- · Replies 2 ·
Undergrad How Does Lorentz Theory Address the Concept of Velocity Becoming Zero?
- bos3yed651
- · Replies 2 ·
High School Positive Energy Theorem Explained in Layman Terms
- windy miller
- · Replies 7 ·
Undergrad General Relativity & Curvature Explained: How Objects Fall
- Gadhav
- · Replies 16 ·
Undergrad Speed of Light: Measuring Meters and Seconds
- Gadhav
- · Replies 11 ·
Undergrad Gravity: Exerting Force or Warping Spacetime?
- Jehannum
- · Replies 15 ·
Undergrad SXS Gravitational Wave Data: Initial Conditions Explained
- BillKet
- · Replies 2 ·
Undergrad Nash embedding theorem & curved spacetime
- BWV
- · Replies 17 ·
High School Fishing in a Black Hole: Can It Be Done?
- magneticanomaly
- · Replies 13 ·
Undergrad Parallel transport of a vector on a sphere
- bres gres
- · Replies 10 ·
Undergrad Can One Observe Anything Falling Into a Black Hole?
- Replusz
- · Replies 3 ·
Graduate Solving Covariant Derivative Notation Confusion
- Markus Kahn
- · Replies 2 ·
High School Can Info Travel FTL? Understanding Speed of Information
- Jenga_89
- · Replies 6 ·
High School Help! Solving Einstein's Length Contraction Problem
- makphi
- · Replies 12 ·
Undergrad Is General Relativity More General than Gravity?
- Demystifier
- · Replies 15 ·
Undergrad Escape Velocity, Gravitational Velocity & Time Dilation
- Grav Velocity
- · Replies 37 ·
Undergrad Derivative consisting Levi-Civita
- vahdaneh
- · Replies 6 ·
Undergrad Lorentz Boosts: Finding Speed, Coordinates & Rotation w/ Matrix Multiply
- Athenian
- · Replies 4 ·
Graduate Meaning of the word "conserved" in relativity
- SiennaTheGr8
- · Replies 6 ·
Graduate Solved: Velocity of Isolated System in Different Inertial Sys.
- liuxinhua
- · Replies 9 ·
Undergrad Planck Length & Singularity: Point or Sphere?
- jnorman34
- · Replies 6 ·
High School Lightwatch/Lightclock (Lichtuhr)
- Martin68
- · Replies 55 ·
Undergrad Observation of matter falling into Black Holes
- ObjectivelyRational
- · Replies 38 ·
High School Infinite Curvature & Hawking Radiation Explained
- Castty
- · Replies 4 ·
High School What Would Light Look Like If Train Moved at > Speed of Light?
- sigr
- · Replies 12 ·
Undergrad GR: Clarifying Different Forms of the Metric for Self-Studiers
- Rollo
- · Replies 6 ·
High School Clarification on Length Contraction
- NoahsArk
- · Replies 52 ·
Undergrad Do These Equations Hold True Beyond Special Relativity?
- olgerm
- · Replies 17 ·
High School S5-HVS1: 10x Slower Relative Time?
- jal
- · Replies 1 ·
High School Linking Quantum Physics and Relativity: Theory of Everything?
- darrenjb
- · Replies 16 ·
Undergrad Basic questions about raising and lowering indices
- olgerm
- · Replies 39 ·
Undergrad Solving Differential Equations in General Relativity
- Jianbing_Shao
- · Replies 1 ·
Undergrad Summation Convention in Einstein Notation
- olgerm
- · Replies 7 ·
High School Elasticity of Spacetime: Does Spacetime Stiffen?
- sqljunkey
- · Replies 7 ·
High School How Does LIGO Detect Gravitational Waves Despite Changes in Spacetime?
- asca
- · Replies 67 ·
High School Energy, Mass, Light: Unveiling the Relationship
- jnorman34
- · Replies 8 ·
Graduate Derivatives of Lagrangian Terms: Why We Lower?
- TroyElliott
- · Replies 6 ·
Undergrad Difference between 1. & 2. Kind Cristoffel Symbols
- olgerm
- · Replies 24 ·