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
Graduate How Does the EFE Describe Geodesic Motion in Curved Spacetime?
- TrickyDicky
- · Replies 26 ·
Graduate Principle of Equivalence Re-examined
- e2m2a
- · Replies 10 ·
Graduate What is the angular-momentum 4-vector?
- Zarathustra0
- · Replies 11 ·
Graduate Where does relativity allow for non-determinism and free will?
- Dmitry67
- · Replies 19 ·
Graduate Confusion with proper time from different frame of references
- Stevey_R
- · Replies 2 ·
Graduate Does relativistic mass increase to infinity as speed approaches c?
- denni89627
- · Replies 15 ·
Graduate Is Proper Time Relative in Special Relativity?
- Shark 774
- · Replies 31 ·
Graduate Am I interpreting Einstein correctly?
- bcrowell
- · Replies 39 ·
Graduate How is the Lorentz transformation derived and what does vx/c² signify?
- Jeno
- · Replies 12 ·
Graduate Einstein's letter to Lincoln Barnett
- pmb_phy
- · Replies 15 ·
High School Signature scheme by pythagoras theorem
- alaoation
- · Replies 10 ·
Graduate Are the definitions of vectors in Liner Algebra and physics contradictory?
- MManuel Abad
- · Replies 8 ·
Graduate Can an Alternating Metric Define a New Spacetime Topology?
- Phrak
- · Replies 6 ·
Graduate Is Velocity Warping Space? A Look into Einstein's Special Relativity Theory
- mayflow
- · Replies 26 ·
Graduate How can photon have frequency if its time is zero?
- skeleton
- · Replies 3 ·
Graduate Nature of the time dimension in 4D space-time
- Mr Peanut
- · Replies 25 ·
Graduate HelloMay I ask a few questions, I am trying to understand how the
- Radiohannah
- · Replies 6 ·
Graduate Time dilation flashlight problem
- dmarbell
- · Replies 62 ·
Graduate Can we calculate the speed at which mass warps spacetime?
- Jake Minneman
- · Replies 3 ·
Graduate Equation for acceleration in MTW
- jfy4
- · Replies 7 ·
Graduate Gravity Probe B press conf. 4 May (any surprises? comment?)
- marcus
- · Replies 7 ·
Graduate Riemannian Geometry is free of Torsion. Why use it for General Relativity?
- oldman
- · Replies 16 ·
Undergrad Can Spaceships Travel Faster Than the Speed of Light?
- multiix
- · Replies 3 ·
Graduate How Does the Standard Model Prevent Faster-Than-Light Travel?
- Jarwulf
- · Replies 4 ·
Graduate Would the effect of photon/quantum wrapping space time be negligible?
- San K
- · Replies 2 ·
Graduate How Fast Does My Friend Appear When We Travel in Opposite Directions at 0.7c?
- Shark 774
- · Replies 1 ·
Graduate Can someone state clearly a sufficient condition for a 4-tuple of
- Kalidor
- · Replies 9 ·
High School Does time exist and do we move through it or it through us?
- humanbeing
- · Replies 3 ·
Graduate What are the axioms of General Relativity?
- PAllen
- · Replies 7 ·
Undergrad That famous equation - a better understanding
- DarkMatterHol
- · Replies 28 ·
Graduate Deriving Graviton Propagator from Linearized Lagrangian
- michael879
- · Replies 1 ·
Graduate Diagonalization of metric matrix in general relativity
- exponent137
- · Replies 9 ·
Undergrad Acceleration vs De-acceleration
- multiix
- · Replies 6 ·
Graduate Why does time dilation create a velocity barrier but not a density barrier?
- beej67
- · Replies 22 ·
Undergrad Lenght contraction of a charged wire and time dilation?
- cragar
- · Replies 5 ·
Graduate Is special relativity consistent with thermodynamics?
- StarThrower
- · Replies 49 ·
Graduate Lorentz transformation consistency in length contraction and time dilation
- vilas
- · Replies 26 ·
Graduate Weak equivalence principle and GR
- TrickyDicky
- · Replies 137 ·
Graduate Do the Principles of Special Relativity Require Synchronized Clocks in K and k?
- JM
- · Replies 90 ·
Graduate Wave vector in curved space-time.
- MManuel Abad
- · Replies 1 ·
Graduate Do all gravity waves have the same frequency?
- cph
- · Replies 2 ·
Undergrad How Does Earth's Gravity Accumulate?
- Mutsi
- · Replies 12 ·
Graduate Spacetime Interval: Is it Invariant Under Rotations?
- Kalidor
- · Replies 5 ·
Graduate Is Time Actually Speeding Up in the Expanding Universe?
- joruz1
- · Replies 8 ·
Graduate Stress tensor : tension VS Pressure
- zn52
- · Replies 1 ·
Graduate Trace-reverse field in linearized GR
- michael879
- · Replies 3 ·
Graduate Bell's spaceship paradox: parallel to t'-axis vs t'=const
- LAHLH
- · Replies 5 ·
Graduate How does the Lorentz metric relate to the topology of flat spacetime?
- dslowik
- · Replies 5 ·
Graduate Self-interactions in linearized gravity
- michael879
- · Replies 2 ·
Graduate What is the Generalized Approach to Lorentzian Relativity?
- PhizzicsPhan
- · Replies 6 ·
Graduate Why does the bend in space time not affect the gyroscope?
- San K
- · Replies 7 ·
Graduate A critique of Mike Fontenot's CADO scheme
- ghwellsjr
- · Replies 54 ·
Graduate C^2 in Lorentz transformations and special relativity.
- accidentprone
- · Replies 10 ·
Graduate Basing everything on speed of light
- teodorakis
- · Replies 8 ·
Graduate Newton's bucket and Galilean relativity
- Hooleehootoo
- · Replies 7 ·
Graduate Lowering indices in the Riemann tensor and Ricci tensor
- Deadstar
- · Replies 3 ·
Graduate Twin paradox without acceleration: three clock scenario
- rede96
- · Replies 24 ·
Graduate Archimedes principle and relativity
- zarei
- · Replies 6 ·
Undergrad How do Lorentz transformations show the relationship between time and space?
- kor
- · Replies 4 ·
Graduate Lagrangian mechanics with non-standard time coordinate synchronization
- pervect
- · Replies 1 ·
Graduate Does frequency of light increase if
- OuterGalactic
- · Replies 4 ·
Graduate Acceleration of Light ensity of Space
- Rezai
- · Replies 14 ·
Graduate Ambiguity in time dilation due to relative velocity
- davidf32
- · Replies 35 ·
Graduate How to denote tetrad in Abstract Index Notation ?
- yicong2011
- · Replies 6 ·
Graduate Is it possible for relative velocity to exceed the speed of light?
- kewljerk
- · Replies 42 ·
Graduate Local Coordinates for Non-Uniformly Accelerated Observer
- LAHLH
- · Replies 1 ·
Undergrad Why doesn't Angela see Mike's frame accelerating in the twin paradox?
- delve
- · Replies 3 ·
Graduate Can a beam entering a black hole be used to communicate with the outside world?
- cragar
- · Replies 4 ·
Graduate Do photons experience instant lifetimes?
- SeventhSigma
- · Replies 12 ·
Graduate When do we use tensor densities rather than tensors?
- Phrak
- · Replies 4 ·
Graduate Is Spacetime Curvature Real? - Take 2
- dm4b
- · Replies 75 ·
Undergrad Relativity Books: Advanced Reads for Engineering Student
- Andrewjh07
- · Replies 2 ·
Undergrad What is the significance of taking the derivative of y=sin^-1(x)?
- JDude13
- · Replies 9 ·
Undergrad Why does acceleration break the symmetry in the twin paradox?
- teodorakis
- · Replies 21 ·
Graduate Does GR fail at the Planck scale?
- LeeJeffries
- · Replies 26 ·
Graduate Electron Falling in Kerr Metric: Release of 40% Rest Energy?
- jfy4
- · Replies 2 ·
Graduate Can Photons Exceed the Speed of Light in a Gravitational Field?
- lfigo170
- · Replies 20 ·
Graduate Conservation of angular momentum in GR
- TrickyDicky
- · Replies 89 ·
Graduate Does time dilation mean aging slows down at near-light speeds?
- lostglutton
- · Replies 28 ·
Undergrad Twin paradox with portals connecting a stationary station and moving spaceship
- SeventhSigma
- · Replies 62 ·
Graduate New Theory of Spacetime: Is Time the 4th Dimension?
- [Quadratic]
- · Replies 1 ·
Graduate Photon gas as medium for electromagnetic propagation
- Pierre007080
- · Replies 2 ·
Graduate How can Block Holes form in finite time?
- twhites
- · Replies 34 ·
Undergrad Why can't I use an accelerating spaceship as a reference frame in special relativity?
- thisisdom
- · Replies 5 ·
Graduate Faster than light and variable light speed in cosmology
- Hyperreality
- · Replies 5 ·
Graduate Terminology for Doppler shifts
- bcrowell
- · Replies 6 ·
Graduate Light beams in opposite directions and time dilation on a moving train
- CuriousStuden
- · Replies 4 ·
Graduate Is there a reference frame where our entire life happens simultaneously?
- phone33
- · Replies 2 ·
Graduate A thought experiment for surpassing the speed of light
- k4ff3
- · Replies 7 ·
Graduate Classical Field Theory without Force
- Phrak
- · Replies 34 ·
Graduate Why is the Speed of Light Constant in Time Dilation?
- cragar
- · Replies 11 ·
Graduate Testability of Torsion in Teleparallel Gravity - V.C. de Andrade et al
- bcrowell
- · Replies 3 ·
Graduate Space-Time Distortion: Matterless Vacuums in Space
- JDude13
- · Replies 5 ·
Graduate Deflection angles of photons passing by black holes
- tcw
- · Replies 5 ·
Graduate Equations for length contraction
- JDude13
- · Replies 2 ·
Undergrad Deriving the speed of light from the Pythagorean Theorem
- frankinstein
- · Replies 26 ·
Graduate Constancy of the speed of light.
- Endervhar
- · Replies 11 ·
Graduate Is (our) future already exists, according to relativity?
- ppppppp
- · Replies 5 ·
Graduate How does blackhole event horizon grow?
- mathfeel
- · Replies 7 ·
Graduate Light reaching train ends at different times causes causality paradox
- ppppppp
- · Replies 8 ·