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 Stress-Energy Tensor: Specified or Calculated?
- pixel
- · Replies 3 ·
High School Is this an adequate thought experiment?
- Shay Katzir
- · Replies 6 ·
Undergrad Modifying EFE to Match Newton's Gravity Predictions
- Herbascious J
- · Replies 32 ·
Undergrad Measuring Gravity Wave Time Distortion Accuracy
- Ratman101
- · Replies 5 ·
Undergrad What is the Strange Solution to the EFE with a Born Frame and Rotating System?
- Mentz114
- · Replies 49 ·
Undergrad Simultaneity of two light rays in different reference frames
- JD_PM
- · Replies 16 ·
High School Can we produce black holes by particle accelerators?
- Xforce
- · Replies 4 ·
High School Twins Paradox: Dropping a Ball from a Moving Train
- jekozo
- · Replies 87 ·
High School Einstein's train and simultaneity
- TheQuestionGuy14
- · Replies 22 ·
Undergrad How Do Physical Quantities Relate to Spacetime in Einstein's Field Equations?
- Herbascious J
- · Replies 8 ·
High School Why do things in free fall accelerate?
- Z3kr0m
- · Replies 47 ·
Undergrad Boosting to an instantaneous rest frame
- Geofleur
- · Replies 16 ·
Undergrad Newton vs Einstein: Explaining Other Forces
- sbaker8688
- · Replies 2 ·
Graduate Index Juggling: Angular Momentum Tensor & Inertia Tensor in 3D-Space
- sergiokapone
- · Replies 3 ·
Undergrad Can empty space be considered ‘elastic’ and expandable?
- Herbascious J
- · Replies 28 ·
High School Bell's Spaceship Paradox & Length Contraction
- David Lewis
- · Replies 76 ·
Graduate Significance of "Change of Signature" in Classical Relativity
- Gordon Jump
- · Replies 14 ·
High School Gravitational Effect from Relativistic Mass: Answers & Questions
- stefanbanev
- · Replies 6 ·
Graduate Model Near-Colliding Ultra-Relativistic BHs w/ Colliding PP Waves
- pervect
- · Replies 5 ·
Graduate Solving Møller Energy Distribution Problem in Paper
- wLw
- · Replies 7 ·
Undergrad Gravitational potential gradient in accelerated reference frames?
- bkercso
- · Replies 1 ·
High School Bohr's Views on Relativity: What Did He Think?
- jeremyfiennes
- · Replies 5 ·
Undergrad Is there such a phenomenon as "micro-frame drag"
- negativzero
- · Replies 8 ·
Graduate Electromagnetic Stress Energy Tensor Formula (-,+,+,+)
- Jay21
- · Replies 3 ·
High School Event Horizon: Understanding the Singularity of a Black Hole
- brianhurren
- · Replies 5 ·
Undergrad Orthonormal Basis - Definition & Examples
- The black vegetable
- · Replies 2 ·
High School Polarized Electron in a Rotating Reference Frame
- metastable
- · Replies 37 ·
High School Spacetime interval - alternative view - maybe?
- whatif
- · Replies 14 ·
High School Deriving the Lorentz transformations
- TobilobaEinstein
- · Replies 4 ·
Undergrad Invariant Mass in Gravitational Fields: Special Relativity
- DuckAmuck
- · Replies 17 ·
Undergrad Are Dimensions Truly Relative to the Observer in the Coastline Paradox?
- Flying_Dutchman
- · Replies 6 ·
Undergrad Length Contraction: Measuring a Difference of 55 Nanometers
- Foppe Hoekstra
- · Replies 3 ·
Graduate A couple of interesting black hole papers
- PAllen
- · Replies 2 ·
Undergrad Does Curving Space by an Approaching Mass Do Work?
- lesaid
- · Replies 4 ·
Graduate Understanding Stokes Theorem and is the variation of the metric a tensor?
- haushofer
- · Replies 3 ·
Undergrad Can all fundamental constants be set to 1 in natural unit systems?
- sysprog
- · Replies 3 ·
Graduate SR Foundations: Parallax Methods? - Reference Request
- strangerep
- · Replies 2 ·
Insights Defining Large-Scale Isotropy: A Formal Definition
- andrewkirk
- · Replies 0 ·
High School Relativator: The circular slide-rule for physicists
- robphy
- · Replies 2 ·
Graduate Relativity Visualization: Aging Twin Paradox - Adam Toons
- A.T.
- · Replies 1 ·
Graduate Correcting a Typo in d'Inverno's Lagrangian on Page 172 | Section 11.3 Results
- nrqed
- · Replies 1 ·
Graduate Rotating black hole interiors take 2
- pervect
- · Replies 1 ·
Graduate Price's Power Law: Mass-Energy Dampening & h Constant
- stevebd1
- · Replies 1 ·
Graduate Vanishing twist of time - like killing field
- WannabeNewton
- · Replies 1 ·
Graduate EP and active/passive mass
- atyy
- · Replies 1 ·
High School Should the 'time' axis of a Minkowski diagram be time's imaginary unit?
- jk22
- · Replies 11 ·
Undergrad What is ds in ds2 = dx2 - cdt2
- Pedroski55
- · Replies 9 ·
High School Trying to understand Lorentz Transformations
- NoahsArk
- · Replies 69 ·
Graduate Light interferometry as described in Thorne's black holes and time warps ?
- matteo210
- · Replies 3 ·
Undergrad Black Holes: Time Bidirectional?
- mousheng xu
- · Replies 3 ·
High School Implications of FTL signals in SR
- windy miller
- · Replies 16 ·
Undergrad Fixing Rindler Coordinates when a=0
- Anwyl
- · Replies 7 ·
Undergrad Is a photon simply a vibration of the spacetime lattice?
- Curiousphy
- · Replies 33 ·
High School Does Time Exist Without Motion?
- TheQuestionGuy14
- · Replies 4 ·
Graduate Coord Transf. in Linearized GR: Understanding Metric Transformation
- Woolyabyss
- · Replies 5 ·
Graduate Einstein-Hilbert Action -> GR is a saddle point?
- JustinLevy
- · Replies 4 ·
High School Understanding Final Form of Lorentz Transformations
- NoahsArk
- · Replies 12 ·
Graduate Restframe of Photon: Explained
- timmdeeg
- · Replies 5 ·
Graduate Question about "Rest frame of a photon" FAQ
- Wes Tausend
- · Replies 19 ·
Graduate Curved-spacetime, but why curved coordinates?
- Master J
- · Replies 4 ·
Graduate Gaussian to MKS Four-vector Conversion
- Born2bwire
- · Replies 1 ·
Graduate Is the Schwarzschild spacetime with negative mass geodesically complete?
- LAHLH
- · Replies 1 ·
High School Is Time Relative? Understanding Special Relativity
- Noah332
- · Replies 45 ·
Undergrad CMB Photons: 3000˚ K to 2.7˚ K in an Expanding Universe
- sector99
- · Replies 12 ·
Graduate Hawking singularity theorem - what if not all geodesics incomplete?
- bcrowell
- · Replies 1 ·
Graduate Experimental tests of zero divergence for stress-energy?
- bcrowell
- · Replies 1 ·
Graduate Wiki article on Unruh radiation
- pervect
- · Replies 1 ·
Graduate Gullstrand-Painlevé coordinates
- stevebd1
- · Replies 1 ·
Graduate The problem of the mass of a body
- wLw
- · Replies 5 ·
Undergrad What happens to the inertia of a mass falling into a black hole?
- KurtLudwig
- · Replies 40 ·
Graduate Lie derivative and Riemann tensor
- lark
- · Replies 1 ·
Graduate Killing vectors in space with torsion?
- salparadise
- · Replies 1 ·
Undergrad Gravity and balls on rubber sheets
- jeffinbath
- · Replies 10 ·
Undergrad Things that can be observed in a snapshot view of the universe
- Jehannum
- · Replies 3 ·
Graduate How Does the 3D Metric Relate to Volume in a Closed Universe?
- QuarkDecay
- · Replies 3 ·
Graduate Kepler & Einstein: Agree or Disagree?
- yuiop
- · Replies 1 ·
Graduate Redshift and blueshift in expanding universe
- michelcolman
- · Replies 2 ·
Graduate Why there can be only one invariant speed
- Rasalhague
- · Replies 5 ·
Graduate Asymmetry in black hole formation, and a possible hand-wavy no-hair theorem
- bcrowell
- · Replies 1 ·
Graduate Video camera links in Special Relativity
- YellowTaxi
- · Replies 1 ·
High School Is time a unique dimension or a constant across all dimensions?
- tylerfarzam
- · Replies 14 ·
High School Einstein's Train Thought Experiment
- DavidMCR
- · Replies 16 ·
Graduate Can red shift compare which clock go faster?
- wangyi
- · Replies 2 ·
Graduate Flat time slices in Gullstrand–Painlevé coordinates?
- ericbrown86
- · Replies 1 ·
Graduate Energy-Momentum Tensor for a particle
- PML
- · Replies 1 ·
Graduate Falling into a charged black hole
- lark
- · Replies 1 ·
Graduate Does expanding space affect time dilation etc?
- Dizzle
- · Replies 2 ·
Graduate How do the energy conditions in GR relate to timelike and null vectors?
- LAHLH
- · Replies 1 ·
Undergrad Centre of Mass-Energy: Griffiths Electrodynamics 4th Ed.
- PeroK
- · Replies 5 ·
High School Time Dilation Dialogue: Understanding the Concept
- DavidMCR
- · Replies 17 ·
Graduate Where does a radially falling test particle cross the inner horizon of RN BH?
- LAHLH
- · Replies 1 ·
Graduate Clocks Falling into Gravity Wells: Variation Observed?
- Diffused
- · Replies 1 ·
Graduate Understand Logic of Wald & Zoupas' Expression on Conserved Quantities
- qinglong.1397
- · Replies 1 ·
Graduate The Physics of De Sitter Black Hole Heat Capacity
- PeteSampras
- · Replies 2 ·
Undergrad Help Understanding Metric Tensor
- dsaun777
- · Replies 12 ·
Undergrad Schwarzschild Geodesics: An Overview
- Goldman clarck
- · Replies 7 ·
Graduate Orbit velocity in Schwarzschild metric?
- MrTictac
- · Replies 13 ·
High School Special Relativity Calc: Half Speed of Light - Jose
- sharinglanguage
- · Replies 1 ·
Undergrad Inside the Schwarzschild horizon
- jbriggs444
- · Replies 5 ·
Undergrad Gravitational Waves: Prerequisites for Study
- kent davidge
- · Replies 1 ·