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 Is the Energy Stress Tensor of Dust Always Zero Inside a Moving Cloud?
- epovo
- · Replies 3 ·
Graduate Numerical integration of motion
- felix00
- · Replies 12 ·
High School Cox & Forshaw derivation: where does the v come from in the Lorentz transformation?
- Ste7e
- · Replies 9 ·
Undergrad About the Equivalence Principle
- JohnnyGui
- · Replies 38 ·
Undergrad Quasars: What Metric Should You Use?
- AleksanderPhy
- · Replies 1 ·
Undergrad Relativistic doppler shifted blackbody color?
- Artlav
- · Replies 7 ·
High School Problem with the atomic clock and time dilation
- Grayman
- · Replies 18 ·
Undergrad Vector to scalar potential, transformation of fields
- OhNoYaDidn't
- · Replies 2 ·
Graduate "Simple" 4D Kerr Geodesics simulator, source code and docs
- m4r35n357
- · Replies 1 ·
Undergrad Christoffel symbols of Schwarzschild metric with Lagrangian
- Stella.Physics
- · Replies 1 ·
High School What Is the Physical Meaning of Curvature in General Relativity?
- Megaton
- · Replies 46 ·
Undergrad At Speed of Light: Standing Still?
- Ronnu
- · Replies 6 ·
Graduate Einstein's Real Motivation Behind GR
- CASPIDE
- · Replies 2 ·
High School Orbital Mechanics: GR vs Newton's Laws
- Peter Riedt
- · Replies 4 ·
Undergrad How to bridge the gap between these approaches to SR?
- leo.
- · Replies 27 ·
Graduate How can we really state that mass (or energy ) is conserved?
- Ahan Sha
- · Replies 12 ·
High School Can Cosmological Constant contract (negative)?
- cube137
- · Replies 5 ·
Graduate Learning Advanced Math Notation for Self-Studying Physics
- Xilor
- · Replies 12 ·
Undergrad Volume vs Circumference of Massive Body
- BTBlueSkies
- · Replies 19 ·
Graduate Why does Huygens' principle fail for even spatial dimensions?
- pervect
- · Replies 3 ·
Undergrad How Does Gravity Propagate Through Different Mediums and Energy Fields?
- Gerinski
- · Replies 3 ·
Undergrad Can Snell's Law Be Derived by Passing to a Moving Frame?
- jk22
- · Replies 7 ·
Undergrad What is the predicted location of gravity in orbiting objects?
- Xilor
- · Replies 22 ·
Undergrad Does the momentum of a photon change in a medium with varying speeds of light?
- bob012345
- · Replies 41 ·
Undergrad How is Einstein's light deflection equation dΦ/dx₂ = dγ/dx₁ derived?
- Clive Redwood
- · Replies 8 ·
Undergrad General Relativity vs Newtonian Weak Field: G Force?
- e2m2a
- · Replies 9 ·
High School Solving Weird Time Dilation Question w/ Spaceships
- Looeelooee1
- · Replies 10 ·
Graduate A Quantum Theory of Spacetime, the Physical Reality of Cross
- Jackie CH Liu
- · Replies 1 ·
Undergrad Beyond the Speed of Light: Objects Beyond the Observable Universe
- Sachabloke
- · Replies 2 ·
Undergrad Moving Schwarzschild Black Hole
- Andrew Kim
- · Replies 3 ·
Undergrad Can Heat Differential Generate Thrust?
- cosmonium
- · Replies 8 ·
Graduate Black Hole information paradox and evolution in time
- gerald V
- · Replies 7 ·
Undergrad Geodesic Equation: Lagrange Approximation Solution for Schwarzschild Metric
- AleksanderPhy
- · Replies 1 ·
High School Driving force in toy gravitational wave detector model
- Paul Colby
- · Replies 16 ·
High School How come GR doesn't describe other forces with curvature?
- nashed
- · Replies 10 ·
High School What actually is space-time?
- Aditya Vishwak
- · Replies 12 ·
Undergrad Where is the flaw in this special relativity paradox argument?
- Xilor
- · Replies 20 ·
Insights Relativity on Rotated Graph Paper - Comments
- robphy
- · Replies 15 ·
Undergrad Two black holes colliding - visual
- mgkii
- · Replies 33 ·
High School What is the nature of spacetime?
- tim9000
- · Replies 88 ·
High School How Does Time Dilation Influence Perceived Velocity?
- AleksanderPhy
- · Replies 1 ·
High School Euler-Lagrange equation for calculating geodesics
- AleksanderPhy
- · Replies 7 ·
Undergrad Gravitational Waves: Propagation or Present?
- epovo
- · Replies 8 ·
Undergrad Lorentz Transformations in the context of tensor analysis
- Diego Berdeja
- · Replies 10 ·
Undergrad Can the Size of the Event Horizon change faster than c?
- Algren
- · Replies 14 ·
High School Temperature of an accelerating system
- alan_longor
- · Replies 17 ·
Undergrad Why are scalar fields Lorentz invariant?
- voila
- · Replies 11 ·
High School Can Energy Really Transform into Matter at CERN?
- BlueQuark
- · Replies 3 ·
Undergrad Can recession velocity of distant galaxies exceed the speed of light?
- kent davidge
- · Replies 13 ·
High School Do two rockets at 0.99c in opposite directions see each other faster than light?
- kolleamm
- · Replies 9 ·
High School Do Gravitational Slingshots cause G-forces
- Momentum117
- · Replies 6 ·
Undergrad Ricci tensor for Schwarzschild metric
- AleksanderPhy
- · Replies 7 ·
Undergrad Does a black hole have a maximum density?
- GregoryC
- · Replies 10 ·
Undergrad Gravitational wave like a harmonic oscillator?
- exponent137
- · Replies 16 ·
High School Falling into a black hole (seen from outside)
- gerald V
- · Replies 7 ·
Undergrad Active vs Passive Lorentz transformation
- voila
- · Replies 17 ·
High School Does the Moon experience different time dilation than Earth?
- hsdrop
- · Replies 6 ·
Undergrad How to show that Electrodynamics is conformally invariant?
- physicality
- · Replies 15 ·
Undergrad Gravity of a Baseball-Sized Universe: Reach to Infinity?
- Pjpic
- · Replies 7 ·
High School Where does a ball land when thrown inside a moving car?
- sunney
- · Replies 4 ·
Undergrad Lorentz derivation of length contraction in electrodynamics
- Babbeus
- · Replies 3 ·
Undergrad Does relative velocity affect the force between moving charged particles?
- Chris Frisella
- · Replies 10 ·
High School Do EFEs Physically Describe Something?
- Megaton
- · Replies 4 ·
High School Twin Paradox: A and B at Different Speeds
- sqljunkey
- · Replies 5 ·
Undergrad A problem about momentum conservation.
- Enryque
- · Replies 7 ·
Undergrad Derivation of E.M. Stress Energy Tensor
- Andrew Kim
- · Replies 5 ·
Graduate Solution to the wave equation in Rindler coordinates
- Wise Owl
- · Replies 5 ·
Graduate Landau Lifshitz Gravitational field equation
- Mr-R
- · Replies 14 ·
Undergrad Definition of stress-energy tensor
- Silviu
- · Replies 3 ·
Undergrad What Is Four-Force in Special Relativity?
- greypilgrim
- · Replies 44 ·
Graduate Metric for Circular Orbit of Two Bodies
- pervect
- · Replies 4 ·
Undergrad What is a free vector and how does it relate to vectors in spacetime?
- Stella.Physics
- · Replies 6 ·
Undergrad How Does Temperature Affect Time Dilation in Clocks?
- greypilgrim
- · Replies 30 ·
Undergrad Effect of GW on Steel Bars: What's the Impact?
- Paul Colby
- · Replies 2 ·
Graduate LLT, GCT and gauge transformations
- Ravi Mohan
- · Replies 5 ·
High School Light Momentum Confusion: Proving with Math/Eqns
- Irfan Nafi
- · Replies 4 ·
High School Velocity of light in acceleration frame.
- fxdung
- · Replies 22 ·
High School Why does the spaceship twin experience time dilation if relative motion is symmetric?
- alan_longor
- · Replies 7 ·
Undergrad Subbing Planck length into length contraction equation?
- Zahidur
- · Replies 2 ·
Undergrad How Do Tensor and Vector Notations Differ in Physics?
- Silviu
- · Replies 7 ·
High School Schwarzschild Metric Derivation?
- mysearch
- · Replies 10 ·
High School Gravitational Waves: What Happens In Between?
- Piranha Butch
- · Replies 2 ·
Undergrad Solving Geodesic Equations with Killing Vectors: Is There a General Solution?
- AleksanderPhy
- · Replies 2 ·
Undergrad Observing Hawking Radiation from Inside a Black Hole
- nomadreid
- · Replies 6 ·
Insights Precession in Special and General Relativity - Comments
- Bill_K_Insights
- · Replies 3 ·
Undergrad Thought Exp: Light Trapped in Gravity Well of Black Hole
- ccrook
- · Replies 3 ·
Undergrad What causes GR to explain Mercury's precession when Newton's formula doesn't?
- nikko lyng
- · Replies 15 ·
High School Why does length contract and what causes time dilation vs length contraction?
- NoahsArk
- · Replies 85 ·
Undergrad Similarities between black hole contraction and universe contraction
- Gerinski
- · Replies 1 ·
Graduate Can soliton-like field lines propagate in higher-dimensional spacetime without diverging?
- bluecap
- · Replies 3 ·
Graduate Polar coordinate neighbourhoods in manifolds
- Bas73
- · Replies 8 ·
High School Can Light Escape the Gravitational Pull of a Black Hole?
- DiracPool
- · Replies 26 ·
Insights Tetrad Fields and Spacetime - Comments
- Bill_K_Insights
- · Replies 1 ·
Undergrad Sticky beads and a simple wave
- Ibix
- · Replies 15 ·
Undergrad Relative Velocity Time Dilation: Experiments Disproving Theory?
- Doc_Z
- · Replies 1 ·
High School Why doesn't mass show up in the stress-energy tensor explicitly?
- e2m2a
- · Replies 2 ·
Undergrad Photon trapped between mirrors brought to zero separation
- peterfreed
- · Replies 23 ·
High School Can a massive object have a velocity of c and zero mass relative to light?
- flexible_time
- · Replies 20 ·
Undergrad Does space become flat when there's no mass present?
- Kevin McHugh
- · Replies 11 ·
Undergrad Validating a ds^2 Metric in General Relativity
- NotASmurf
- · Replies 2 ·