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 Far Is It To The Center Of The Milky Way/Tootsie Pop?
- Daleri Mc Rileda
- · Replies 13 ·
Undergrad Metric for Infinite Rod in Gen. Relativity
- t_r_theta_phi
- · Replies 1 ·
Undergrad Spatial geometry of constant Schwarzschild time hypersurface
- MeJennifer
- · Replies 20 ·
Undergrad Is Flamm's paraboloid a paraboloid?
- pchu
- · Replies 14 ·
High School Is Gravity Trapped Inside Black Holes?
- Umair Shariff
- · Replies 13 ·
Graduate Solving Exact Gravitational Plane Wave Confusion
- pervect
- · Replies 6 ·
Undergrad Action in Relativity: Non-Relativistic vs Relativistic Particles
- Meddusa
- · Replies 8 ·
Undergrad Deriving EM Energy Conservation from Lagrangian
- progato
- · Replies 2 ·
Undergrad Relationship between quadratic and square-root lagrangians
- stevendaryl
- · Replies 9 ·
Undergrad Time dilation time travel for novel - I need a calculation
- writer
- · Replies 16 ·
Undergrad Does the 1 Second after the Big Bang = 1 second now?
- Pjpic
- · Replies 10 ·
Graduate Metric with Harmonic Coefficient and General Relativity
- Alexander Pigazzini
- · Replies 1 ·
Graduate Speed of Light in All Reference Frames: A Question
- Dr. Manoj
- · Replies 9 ·
Undergrad Gravitational Lagrangian density
- mertcan
- · Replies 22 ·
High School How can stationary objects be attracted without moving in curved spacetime?
- Andreas C
- · Replies 43 ·
High School Understanding Minkowski Diagrams in Special Relativity
- jannesvanpoppelen
- · Replies 9 ·
Undergrad Why does time dilation affect all clocks equally?
- NoahsArk
- · Replies 35 ·
Undergrad Velocity Addition: Physical Meaning of Non-Singularity at c?
- greypilgrim
- · Replies 7 ·
Undergrad Is the cosmological constant equivalent to vacuum energy?
- stevendaryl
- · Replies 43 ·
High School Experimental evidence that pure energy can curve spacetime?
- mjordan2nd
- · Replies 25 ·
Undergrad Cosmological Constant Problem: Pre-Req Knowledge for Paper
- Junaid456
- · Replies 4 ·
Graduate Stress energy tensor general relativity
- mertcan
- · Replies 4 ·
Undergrad Minkowski diagrams without scales on axes
- greypilgrim
- · Replies 20 ·
Undergrad Leading and lagging clock times in Lorentz Transforms
- exmarine
- · Replies 3 ·
Undergrad Can special relativity explain magnetism of moving charged particles?
- Danyon
- · Replies 11 ·
Undergrad Wald's Mistake on Einstein Tensor pg 97?
- JonnyG
- · Replies 3 ·
Undergrad If c changes w/ time, what happens with laws of SR?
- dm4b
- · Replies 23 ·
Undergrad Galilean Relativity: Can Experiments Tell Motion Relative to Other Frames?
- Alpha1
- · Replies 3 ·
High School Why would your head age faster than your feet in an accelerating elevator?
- Stephanus
- · Replies 9 ·
Undergrad Book Suggestions: Learn Einstein's General Theory of Relativity
- Akshay690
- · Replies 9 ·
High School LIGO Detection Question: Why Lighter Masses Mean More Time
- verve825
- · Replies 3 ·
Undergrad Maxwell's equations and the constancy of light speed in special relativity
- Akshay690
- · Replies 3 ·
Graduate Has anyone heard rumors of gravitational waves detected at Advanced LIGO?
- phyzguy
- · Replies 213 ·
High School Observer Sees When I Throw Ball at Speed of Light
- jirakst
- · Replies 3 ·
Undergrad Friedman-Robertson-Walker metric
- TimeRip496
- · Replies 10 ·
High School What Happens to Spacetime Fabric at a Black Hole's Singularity When It Moves?
- mikeeey
- · Replies 11 ·
Undergrad Parametrizing a path through spacetime
- guitarphysics
- · Replies 9 ·
Undergrad Holographic Principle discussion in Sean Carroll's book
- mindarson
- · Replies 8 ·
Graduate What is the Topological Structure of Hypersurfaces in General Relativity?
- Ravi Mohan
- · Replies 9 ·
Undergrad Meaning of the equivalence principle in General relativity
- exponent137
- · Replies 12 ·
High School Could a black hole involve a phase transition?
- t689
- · Replies 1 ·
Undergrad Gravitational Waves Vs. Aether Wind
- ScientificMind
- · Replies 3 ·
High School Why can integration constants be dropped in E=mc²?
- greypilgrim
- · Replies 10 ·
Graduate Prove Constant Curvature: Homogeneity Implied by Cosmological Principle
- JonnyG
- · Replies 8 ·
Graduate John Norton on the Hole Argument
- haushofer
- · Replies 15 ·
Graduate An observation on potential energy in GR
- Jonathan Scott
- · Replies 16 ·
Undergrad How can you define a simultaneity slice if relativity forbids simultaneity?
- nomadreid
- · Replies 8 ·
Undergrad Does adding mass to a black hole decrease spacetime curvature at the singularity?
- Felix Quintana
- · Replies 4 ·
Undergrad Do we need a billion muons to detect muons from cosmic rays, or is 70 enough?
- Quandry
- · Replies 3 ·
High School Length contraction when two objects approach each other at relativistic speeds
- kolleamm
- · Replies 11 ·
High School Visualizing the twin paradox with a Java program showing both reference frames
- Jeronimus
- · Replies 5 ·
Undergrad SR Pseudo-Paradox: Photons Affected by Emitter?
- secur
- · Replies 4 ·
High School Some basic questions about length contraction in SR
- rede96
- · Replies 16 ·
Undergrad Precise mathematical definitions of time dilation and differential aging
- exmarine
- · Replies 4 ·
High School Crashing into an event horizon
- .Scott
- · Replies 20 ·
Undergrad Could it be meaningful to speak of the "density of space"?
- Gerinski
- · Replies 18 ·
Undergrad Is there any 2D surface whose metric tensor is eta?
- arpon
- · Replies 4 ·
High School Deriving Special Relativity Formulae Steps
- Clever Penguin
- · Replies 4 ·
High School Why should Michelson-Morley fringe pattern repeat at 0° and 90° rotation?
- FranzDiCoccio
- · Replies 29 ·
Undergrad Does relativistic invariance explain the quantum vacuum energy?
- DaTario
- · Replies 5 ·
High School How are proper distances measured when objects are in relative motion?
- rede96
- · Replies 11 ·
Undergrad Relativistic Momentum Invariance in Perpendicular Boosts
- greypilgrim
- · Replies 3 ·
Undergrad Galilean Equivalence Principle: Extended Objects
- learner91
- · Replies 8 ·
Undergrad Fixed Stars Moving Faster Than Light? Problem?
- KingSnackMan
- · Replies 6 ·
Undergrad Opposite of Black Hole - Matter Repulsion?
- Felix Quintana
- · Replies 3 ·
Graduate Interpretation of [itex]\partial_\nu T^{\mu \nu}[/itex]
- mjordan2nd
- · Replies 8 ·
Undergrad Special relativity of two clocks
- Physgeek64
- · Replies 4 ·
High School Does time stop at the center of a black hole?
- Benplace
- · Replies 16 ·
High School Connected events at opposite ends of a photon's travel
- KenJackson
- · Replies 24 ·
Graduate How Does the Penrose Process Allow for Energy Extraction from a Black Hole?
- astrolollo
- · Replies 3 ·
Graduate Which Representation of Christoffel Symbols is Correct?
- mertcan
- · Replies 14 ·
Graduate Deriving Einstein's Equation: Calculating ##R_{00}##
- JonnyG
- · Replies 2 ·
High School Derivation of E=Mc2? For the common man
- jonatron5
- · Replies 3 ·
High School What Does it Mean When a Black Hole is Spinning?
- Gonzalo Chumillas
- · Replies 10 ·
Undergrad Small back hole merging more massive body
- Gerinski
- · Replies 6 ·
Undergrad Looking out from a event horizon
- Vidar Martinsen
- · Replies 18 ·
Undergrad Do photons have active gravitational mass and attract each other?
- SteveDC
- · Replies 7 ·
High School Could reflected light interfere in a time dilation model?
- Eshu
- · Replies 2 ·
High School How well is Time understood i. Space time?
- jonatron5
- · Replies 4 ·
High School Does spacetime exist outside the universe?
- ChrisPNZ
- · Replies 1 ·
Insights A Problem from "Incandescence" - Comments
- pervect
- · Replies 4 ·
Graduate How did Einstein compute light deviation before the Schwarzschild metric?
- e2m2a
- · Replies 4 ·
Undergrad Do Fields Affect 4-Momentum Conservation?
- SiennaTheGr8
- · Replies 4 ·
Undergrad Time dilation in special vs. general relativity
- philipp
- · Replies 10 ·
Undergrad Maxwell's homogeneous equations in antisymmetric tensor notation
- Mick0101
- · Replies 2 ·
Undergrad How Do You Correctly Apply Indices in Tensor Calculus for Curvature?
- BiGyElLoWhAt
- · Replies 3 ·
Graduate Why is the stress-energy tensor symmetric and why the sign convention?
- JonnyG
- · Replies 3 ·
High School Calculating Mass for Gravitational Time Dilation
- marksrobby
- · Replies 4 ·
High School Gravity Effects on EM Wave Phase Change
- marlowgs
- · Replies 8 ·
Graduate Are temperature and pressure related by relativity?
- Gerald Kaiser
- · Replies 3 ·
Graduate Conservation of Electromagnetic Energy-Momentum Tensor
- mjordan2nd
- · Replies 1 ·
Undergrad How much does a light beam bend when passing near a mass?
- squirrlmcduckles
- · Replies 2 ·
Undergrad Why does general relativity require tensors while classical mechanics doesn't?
- Logic Cloud
- · Replies 12 ·
Undergrad Permeability/permittivity constants and one way speed of c
- Battlemage!
- · Replies 14 ·
Undergrad Raising index on covariant derivative operator?
- guitarphysics
- · Replies 15 ·
High School Do Higher-Dimensional Objects Experience Length Contraction in 3D Space?
- Einstein's Cat
- · Replies 9 ·
Undergrad Qs re Hawking Radiation – Part I
- Buzz Bloom
- · Replies 4 ·
High School Why r=0 is inevitable when crossing horizon?
- craigthone
- · Replies 9 ·
Undergrad Hawking Radiation: Qs re Energy Density at r > Rc
- Buzz Bloom
- · Replies 9 ·
Undergrad 2D Time dilation simulation with several clocks?
- greypilgrim
- · Replies 12 ·