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 Why does time dilation occur in special relativity?
- 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 Logic of Wald and Zoupas' expression 33 for conserved quantities
- qinglong.1397
- · Replies 1 ·
Graduate The Physics of De Sitter Black Hole Heat Capacity
- PeteSampras
- · Replies 2 ·
Undergrad How is the metric tensor determined in general relativity?
- 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 ·
Undergrad Accelerating into a black hole?
- spinstate
- · Replies 7 ·
Undergrad Is the Equation for Relativistic Two-Body Decay Correct?
- EquationOfMotion
- · Replies 1 ·
Graduate Venus during the day, a test of relativity?
- Vast
- · Replies 8 ·
Graduate Does Komar Mass Include the Energy of Gravitational Field?
- wLw
- · Replies 38 ·
High School Black Hole Evaporation: What's Left?
- nateHI
- · Replies 1 ·
Undergrad Are spatial components of orthogonal 4-vectors perpendicular in all frames?
- SiennaTheGr8
- · Replies 5 ·
Graduate Uniformity of universe expansion
- nomadreid
- · Replies 3 ·
Undergrad Compute Physical Coordinates of an Event in a Curved Spacetime
- TheNewBie2019
- · Replies 1 ·
Graduate Could a Fixed Point on a Strong Fishing Line Influence Space-Time?
- oldman
- · Replies 1 ·
Graduate Can Wormholes Accurately Determine Points in Space and Time?
- dismas
- · Replies 1 ·
Undergrad What conditions must M(u) satisfy in outgoing Vaidya metrics?
- Tomas Vencl
- · Replies 3 ·
Graduate Einstein-Strauss solution with one or two bubbles
- smallphi
- · Replies 1 ·
Graduate Why time dilation energy decreases by factor of two in two-body systems
- Xeinstein
- · Replies 1 ·
Graduate Frequency shift and relative velocity
- Saw
- · Replies 2 ·
Graduate What does the image of the black hole say about general relativity?
- haael
- · Replies 1 ·
Graduate Can FTL communication avoid causality paradoxes with a preferred reference frame?
- Ich
- · Replies 1 ·
High School What does the constancy of speed of light mean?
- thaiqi
- · Replies 32 ·
Graduate Is Empty Spacetime Observable or Merely Theoretical?
- wolram
- · Replies 1 ·
Graduate Bigbang Bigcrunch Singular event?
- Romulus100
- · Replies 1 ·
Graduate Local coordinates, physical coordinates
- mrandersdk
- · Replies 1 ·
Graduate Mach's principle and variable speed of light.
- CarlB
- · Replies 1 ·
Graduate Length contraction and wave length transformation
- bernhard.rothenstein
- · Replies 1 ·
Undergrad Does this contradict or require GR?
- Buckethead
- · Replies 15 ·
Graduate About the validity of Einstein’s 1905 Principle of Relativity
- RVHG(R.Valls)
- · Replies 1 ·
Graduate Relativistic momentum conservation in elastic billiard ball collision
- SamRoss
- · Replies 1 ·
Undergrad E on q independent of v - confusing?
- jason12345
- · Replies 1 ·
Graduate Quantum gravitational uncertainty
- exponent137
- · Replies 1 ·
Graduate Gamma Ray Bursts and Gravitational Radiation
- Desh627
- · Replies 1 ·
Graduate Redshift/Blueshift of Gravity Waves Around a Black Hole
- nottay
- · Replies 1 ·
Graduate Wormhole Travel: 10 LY Away in an Instant?
- billbray
- · Replies 1 ·
Graduate Belinfante tensor relation to conserved current
- kent davidge
- · Replies 1 ·
Graduate Is Spacetime the Cause of Inertia?
- PhizzicsPhan
- · Replies 1 ·
Graduate On when does Hawking radiation begin?
- PAllen
- · Replies 1 ·
Graduate Is the perception of backwards time possible in relativity during deceleration?
- Ookke
- · Replies 1 ·
Undergrad How would you explain special and general relativity in 3 sentences each?
- taybot
- · Replies 1 ·
Graduate Discrete Relativity: Measuring Planck Units
- PFanalog57
- · Replies 1 ·
Graduate What Does Distinguished Really Mean in Technical and Legal Contexts?
- LAncienne
- · Replies 1 ·
Graduate How does a large mass warp space?
- 81+
- · Replies 1 ·
Graduate Time Travel Question (from A Briefer History of Time )
- Legendre
- · Replies 1 ·
Graduate Relativistic mass affect weight of an object?
- aexyl93
- · Replies 1 ·
Graduate Request for sticky on drawing spacetime diagrams
- granpa
- · Replies 1 ·
Graduate Can Unknown Physics Explain the Singularity of a Black Hole?
- kurious
- · Replies 1 ·
Graduate Rest Frame of a Photon - FAQ by Forum Members
- D H
- · Replies 1 ·
High School Did Einstein Disagree With Black Holes?
- nitsuj
- · Replies 6 ·
Graduate What Is the Best Way to Teach Special Relativity?
- silagadze
- · Replies 1 ·
Undergrad Can an observer actually cross a black hole event horizon?
- Aidyan
- · Replies 9 ·
Graduate Resolving the Black Hole Paradox: A Perspective from Different Reference Frames
- Ray Eston Smith Jr
- · Replies 1 ·
Graduate History and evidence against c-decay
- Phobos
- · Replies 1 ·
Graduate Gravitational waves, electromagntic waves and charged particles
- graupner1000
- · Replies 1 ·
Graduate Throwing Balls on a Large Planet: GR Approximation Problem
- Ibix
- · Replies 8 ·
Undergrad Could photons form standing patterns in curved spacetime?
- TerranIV
- · Replies 11 ·
Undergrad Particles w/ 0 Inertial Mass Traveling Faster than Light?
- TerranIV
- · Replies 9 ·
Undergrad Looking for more accurate energy-momentum transformations for photons
- tade
- · Replies 35 ·
High School Do we understand what the Universe looks like for a photon?
- fbs7
- · Replies 20 ·
Undergrad Reading suggestions about the "nature of time"
- Lapidus
- · Replies 27 ·
Undergrad Transverse inertial motion of rockets in acceleration
- sweet springs
- · Replies 18 ·
Graduate Describing a Rotating Vector with Changing Angular-Velocity
- Jianbing_Shao
- · Replies 4 ·
High School Is the Twin Paradox Really a Paradox?
- Papo1111
- · Replies 61 ·
Undergrad Can a laser ejecting mass create gravitational waves like collapsing black holes?
- .Scott
- · Replies 5 ·
High School Is mass the only store of energy
- Daniel Wareham
- · Replies 9 ·
Undergrad Time Dilation Effects - Understand without Clocks
- mrSpring
- · Replies 6 ·
Undergrad Uniqueness Theorems in Non-Flat Spacetime
- Max Green
- · Replies 3 ·
Graduate Would a traveler to Alpha Centauri measure length contraction of the distance?
- LAP3141
- · Replies 3 ·
Graduate Where can I find the derivation of the relativistic Boltzmann equation
- Ekphy
- · Replies 3 ·
High School Is the Universe Moving in Circular Patterns Within the 4th Dimension?
- Vibhu
- · Replies 2 ·
Graduate Mass of Hadrons: Verifying Special Relativity
- CaptainMarvel1899
- · Replies 8 ·
Undergrad Is the Delta Function a Scalar?
- kent davidge
- · Replies 1 ·
Undergrad Can a change in electric field generate a magnetic field at the speed of light?
- Jaysal
- · Replies 7 ·
Undergrad Conserved Stress-Energy in Gravitational Theories
- gerald V
- · Replies 6 ·
Undergrad Determining c from Maxwell's Equations
- Buckethead
- · Replies 31 ·
High School Magnetic field and moving charge special relativity
- Herbert11
- · Replies 7 ·
Undergrad Invariance of Action: Lagrangian Transformation
- kent davidge
- · Replies 3 ·
Graduate Equations for computing null geodesics in Schwarzschild spacetime
- LightAintSoFast
- · Replies 8 ·
High School Coulomb force over Rindler horizon
- jartsa
- · Replies 31 ·
High School Time dilation and Einstein's theorem
- worlov
- · Replies 58 ·
Undergrad Gravity Waves or Gravity Delay: Which Concept Explains Our Cosmic Stretching?
- CHOP
- · Replies 4 ·
High School Questions on Covariance and Contravariance of Vectors
- geordief
- · Replies 10 ·
Undergrad What causes gravitational waves and how do they weaken with distance?
- PeterB
- · Replies 3 ·
Undergrad Do free particles always follow geodesics?
- kent davidge
- · Replies 20 ·
High School How much time dilation is there as time passes?
- Snickers
- · Replies 36 ·
Insights Fermi-Walker Transport in Kerr Spacetime - Comments
- PeterDonis
- · Replies 2 ·
Undergrad Space-time curvature and the fabric of space
- nikkor180
- · Replies 13 ·
Undergrad Confusion about index notation and operations of GR
- Put1demerde
- · Replies 8 ·
High School Propagation of changes in a gravitational field
- Lord Crc
- · Replies 31 ·
Undergrad Black hole orbital mechanics questions
- alexchamp29
- · Replies 16 ·
Graduate How to derive the tetrad for the Kerr metric
- Zuhaa Naz
- · Replies 26 ·
Graduate Penrose diagram of black hole with a changing event horizon
- Sonderval
- · Replies 3 ·
Undergrad Gravitational field versus acceleration
- Jaysal
- · Replies 20 ·
Undergrad Relativistic form of the displacement current using the Biot-Savart Law
- tade
- · Replies 26 ·