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 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 Is Gravity Really Just 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 Question about cosmological constant
- 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 Special relativity and magnetism
- 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 Einstein Elevator: Time Dilation Questions Answered
- 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 Understanding General Relativity
- Akshay690
- · Replies 3 ·
Graduate Rumors of Gravitational Wave Inspiral at Advanced LIGO | Sept 2015 Launch
- 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 From dE=dm*c^2 to E=m*c^2: Integration constant?
- 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 Reconciling Simultaneity & Relativity: Navigating the Spacetime Maze
- nomadreid
- · Replies 8 ·
Undergrad Black Hole & Spacetime Curvature: Can Mass Decrease It?
- Felix Quintana
- · Replies 4 ·
Undergrad Time Dilation Explained: Muon Decay & Reaching Earth
- Quandry
- · Replies 3 ·
High School Who Compresses More: Obj1 or Obj2 at C Speeds?
- kolleamm
- · Replies 11 ·
High School Twin Paradox Visualization: Understanding with Java & Diagrams
- 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 Time Dilation & Differential Aging: Defined
- 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 Question about Michelson-Morley experiment
- FranzDiCoccio
- · Replies 29 ·
Undergrad Quantum Mechanics & Relativity: Vacuum Connection?
- DaTario
- · Replies 5 ·
High School Understand Proper Distances in SR/GR: A Layman's Guide
- 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 Gravitational Mass of Photons: Passive & Active
- SteveDC
- · Replies 7 ·
High School Time Dilation Model & Wave Interference: Newbie Questions Answered
- Eshu
- · Replies 2 ·
High School How well is Time understood i. Space time?
- jonatron5
- · Replies 4 ·
High School Space-Time & Strings: Current Thinking?
- ChrisPNZ
- · Replies 1 ·
Insights A Problem from "Incandescence" - Comments
- pervect
- · Replies 4 ·
Graduate Einstein & Light Deviation: Compute w/o 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 Eqns: Notation Explained | Mick
- Mick0101
- · Replies 2 ·
Undergrad How Do You Correctly Apply Indices in Tensor Calculus for Curvature?
- BiGyElLoWhAt
- · Replies 3 ·
Graduate Stress-Energy Tensor: Basics & Questions
- 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 Light Beam Bending by Mass: Equation & Explanation
- squirrlmcduckles
- · Replies 2 ·
Undergrad Tensor Formalism in GR: Why We Need Tensors
- 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 ·
Undergrad Cosmological Constant: Expanding Universe & Data Contradiction
- mertcan
- · Replies 4 ·
Undergrad Space and time as fields of mass-energy
- The Count
- · Replies 8 ·
Graduate Subtraction of Christoffel symbol
- mertcan
- · Replies 8 ·
Undergrad Field equations fully written out
- greypilgrim
- · Replies 3 ·
Undergrad GR vs SR: Is a Connection Necessary?
- greypilgrim
- · Replies 5 ·
Undergrad Consequences of length contraction
- Vidar Martinsen
- · Replies 18 ·
Undergrad Gravitational potential energy and rest mass
- e2m2a
- · Replies 19 ·
Undergrad Time dilation in relativistic Doppler effect
- DarthVader
- · Replies 21 ·
High School Energy required to change speed?
- Jeronimus
- · Replies 5 ·
Graduate Are Killing Horizon and Stationary Limit Surface the same?
- Elnur Hajiyev
- · Replies 30 ·