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 A supplementary length contraction question
- Glenn G
- · Replies 3 ·
Undergrad GR change in proximal tendancy
- name123
- · Replies 17 ·
High School Time dilation and length contraction question
- Glenn G
- · Replies 9 ·
Undergrad Raising/Lowering Indices w/ Metric & Tensors: Does Order Matter?
- binbagsss
- · Replies 1 ·
High School Relative Mass & Inertia: Could Near-c Collision Destroy a Star?
- Chris Miller
- · Replies 5 ·
Undergrad Virtual Particles: Speed & Impact on Rocket
- mdl
- · Replies 2 ·
Undergrad Understanding Relativistic Ptcl Lagrangian: S1 vs. S2
- michael879
- · Replies 2 ·
Undergrad Absolute Energy in General Relativity?
- jcap
- · Replies 8 ·
Undergrad Accelerate Charged Particle: Does Light Require Force?
- MackBlanch
- · Replies 5 ·
Graduate Event horizon vicinity in isotropic coordinates
- Jonathan Scott
- · Replies 13 ·
Graduate Understanding Tolman Solution & f(R) Corrections
- inertiagrav
- · Replies 9 ·
Undergrad Black Hole Creation at Near Light Speed? - Prof. Andrea Ghez
- jobyts
- · Replies 4 ·
Undergrad Electromagnetic Force in Special Relativity
- L0r3n20
- · Replies 4 ·
High School Stationary frames of reference
- name123
- · Replies 69 ·
Undergrad Resolution to the Tachyonic Antitelephone paradox
- industry7
- · Replies 10 ·
High School How Do You Derive the Full Energy Momentum Relation Using Lorentz Factor?
- Glenn G
- · Replies 7 ·
Undergrad Gradient of a time-dependent function
- Sturk200
- · Replies 2 ·
Graduate Light from the singularity of a charged black hole
- Elnur Hajiyev
- · Replies 18 ·
High School Laser Pointer at Speed of Light: Does It Point Ahead?
- Joe Butler
- · Replies 3 ·
High School Understanding a Special-Relativity Frame and Comoving Center-of-Mass
- mark57
- · Replies 6 ·
High School The Singularity and Hawking radiation
- DreamLord101
- · Replies 7 ·
Graduate Assumptions behind Maxwell's equations for constant speed
- giulio_hep
- · Replies 6 ·
High School Neutron Star Becomes Black Hole: How Can 2 Realities Coexist?
- a1call
- · Replies 30 ·
Graduate FTL Travel: Is It Really Impossible?
- SciFiWriterGuy
- · Replies 13 ·
Undergrad Spacetime Metric: Which signature is better?
- LarryS
- · Replies 5 ·
Undergrad Spacelike hyperbolae -- accelerated reference frames
- smodak
- · Replies 21 ·
Undergrad A spaceship traveling close to the speed of light sending some data....
- radres
- · Replies 94 ·
High School Why Special Relativity have overcome Ether Theory?
- Bartolomeo
- · Replies 7 ·
Undergrad Length Contraction & Time Dilation Beyond Planck Scale: Correct?
- Flatland
- · Replies 4 ·
High School What is the true nature of the mass of a black hole?
- Brunolem33
- · Replies 16 ·
Undergrad Deriving Magnetic Force w/ Approximated Gamma-Factor at UVA
- greypilgrim
- · Replies 4 ·
Undergrad Accelerating Internal OAM Photon Wavefronts Under Gravity
- calinvass
- · Replies 5 ·
High School Evolution of Principles: Michelson-Morley, Lorentz & Einstein
- Glenn G
- · Replies 4 ·
Undergrad Galilean Vs. Lorentz Transformations
- rmiller70015
- · Replies 9 ·
High School Gravity, time and interplanetary communication
- Brunolem33
- · Replies 18 ·
High School Blackhole breaking the speed limit of light?
- youshouldtry11
- · Replies 10 ·
Undergrad Relativity of Simultaneity and frames
- Conservation
- · Replies 16 ·
High School Time dilation problem question
- IvicaPhysics
- · Replies 134 ·
Undergrad Question on §3 of Einstein's 1905 paper
- Brett Oertel
- · Replies 1 ·
Undergrad Is Causality Relative in Black Holes?
- FallenApple
- · Replies 6 ·
Undergrad Strange Spacetime behavior inside Event Horizon
- FallenApple
- · Replies 8 ·
Undergrad Do laws of physics apply below the event horizon?
- ThomasLLS
- · Replies 17 ·
Undergrad Connection between Foucault pendulum and parallel transport
- Joker93
- · Replies 6 ·
High School Relative speed between Galaxies
- Razola
- · Replies 13 ·
Undergrad Detecting Gravitational Waves: Is My Understanding Wrong?
- wvphysicist
- · Replies 5 ·
Graduate How was the value of the spacetime curvature obtained?
- arupel
- · Replies 3 ·
High School Traveling to nearest star at nearly the speed of light
- lifeonmercury
- · Replies 9 ·
Undergrad Why doesn't the Earth's radius change while the surface accelerates?
- FallenApple
- · Replies 26 ·
Undergrad Two twins moving towards each other in a circular orbit
- Battlemage!
- · Replies 31 ·
Graduate Physical meaning of open set on manifold
- AlephClo
- · Replies 5 ·
Undergrad Is it possible to distort a black hole's event horizon
- dratone
- · Replies 5 ·
Undergrad Relativity's "time dilation" or clock accuracy alteration
- Crowxe
- · Replies 59 ·
Undergrad Explaining Different Types of Time in Relativity
- windy miller
- · Replies 6 ·
High School Can Understanding Spacetime Lead to Time Travel?
- Dheer Parikh
- · Replies 4 ·
Undergrad Christoffel Symbol vs. Vector Potential
- quickAndLucky
- · Replies 6 ·
Undergrad What does it take to spaghettify?
- Andreas C
- · Replies 27 ·
Undergrad Is the Age of Our Universe Affected by the Speed of Time at the Big Bang?
- Jacob Gawel
- · Replies 26 ·
High School Curved line shortest distance between two points?
- ChrisisC
- · Replies 6 ·
Undergrad Why not find mass increase in a simple way?
- alba
- · Replies 40 ·
Undergrad Help Deriving Relativistic Momentum Equation 3.9
- albertrichardf
- · Replies 4 ·
Undergrad Solving Length Contraction Paradox
- Jonsson
- · Replies 3 ·
Undergrad Null geodesics in Schwarzschild spacetime
- Ibix
- · Replies 14 ·
Insights The Schwarzschild Geometry: Part 4 - Comments
- PeterDonis
- · Replies 33 ·
High School Gravitational lensing thought experiment
- stoomart
- · Replies 12 ·
High School If the Sun disappeared, would the Earth continue to orbit?
- Ka Driver
- · Replies 29 ·
High School Can you reverse Einstein's famous E=mc^2 equation?
- gabi123
- · Replies 7 ·
Graduate Einstein's Field Equations: "Smoke Ring" Solution?
- cuallito
- · Replies 2 ·
High School Black Hole Collision: What Happens When a Large Swallows Smaller?
- James Minwell
- · Replies 3 ·
Undergrad Einstein's Equivalence Principle.
- FallenApple
- · Replies 11 ·
Undergrad Misner Solution Line Element | Einstein Field Equations
- space-time
- · Replies 2 ·
Undergrad Relativity of simultaneity -- an example in D.Morin's book
- Oz123
- · Replies 23 ·
Undergrad Velocity Addition Example: Morin's Confusing Use of Equation
- Oz123
- · Replies 8 ·
Undergrad Gravitational Redshift: Derivation from Static Metric
- redtree
- · Replies 4 ·
High School Why Need Covarient Form of Electrodynamics?
- physicist 12345
- · Replies 15 ·
High School Time dilation and thermodynamics
- Thebugger
- · Replies 31 ·
Graduate Reference for coordinate view of equations of motion
- Jonathan Scott
- · Replies 7 ·
High School Bending of light in a gravitational field
- Frank Castle
- · Replies 21 ·
Undergrad Is a 2-body elliptical orbit stable in GR?
- Buzz Bloom
- · Replies 3 ·
Graduate Train thought experiment confusion
- jebii
- · Replies 8 ·
Graduate How is the invariant speed of light enocded in SL(2,C)?
- jakob1111
- · Replies 4 ·
Graduate Interpretation of Derivative of Metric = 0 in GR - Learning from Wald
- LarryL
- · Replies 2 ·
High School Maxwell's equations and gravitation
- naima
- · Replies 12 ·
Graduate Contraction between Levi-Civita symbol and Riemann tensor
- mhob
- · Replies 4 ·
High School How would the solar system appear if you approached at near c?
- Chris Miller
- · Replies 125 ·
High School Photography in 4D World: Time & Space
- sonutabitha
- · Replies 5 ·
Undergrad Collision in special relativity
- exponent137
- · Replies 6 ·
Undergrad Understanding the Einstein Train Thought Experiment: Scenario Comparisons
- Dopplershift
- · Replies 3 ·
Undergrad Two metric tensors describing same geometry
- arpon
- · Replies 17 ·
Undergrad Deriving distances from reference frames
- JohnnyGui
- · Replies 26 ·
High School Length Contraction equation derivation
- Inderjeet
- · Replies 6 ·
Undergrad Is mass conserved in relativistic collision?
- Zarif
- · Replies 30 ·
Graduate Pontryagin densities and Chern-Simons form
- shereen1
- · Replies 3 ·
Undergrad Why was time dilation under GR a new concept?
- FallenApple
- · Replies 11 ·
Undergrad Special relativity and inertial frames
- redtree
- · Replies 17 ·
High School Special relativity and sequence of events
- Glenn G
- · Replies 16 ·
High School Earth time dilation vs Sun time dilation
- orion1977
- · Replies 3 ·
High School Flat Universe: What Does It Mean to be 3-Dimensional?
- ChrisisC
- · Replies 1 ·
High School Information traveling faster than light
- MiLara
- · Replies 6 ·
Undergrad A good reference sheet/manual about Einstein index notation?
- Gan_HOPE326
- · Replies 4 ·
Undergrad Mass in Special Relativity: Misconception or Reality?
- HungryBunny
- · Replies 5 ·