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 Measuring one-way light speed in special relativity
- rede96
- · Replies 44 ·
Graduate Flash of light thought experiment, need explanation
- marmot
- · Replies 2 ·
Undergrad Time with no gravitational force
- Guiga
- · Replies 5 ·
Graduate About confusion of lenght contraction, and possiblity of length expansion
- A Dhingra
- · Replies 11 ·
Graduate Derivative of a function of a lorentz scalar
- RedX
- · Replies 3 ·
Graduate Variation of the auxiliary worldsheet metric
- Jack2013
- · Replies 3 ·
Graduate Combining time dilation and length contraction
- Teachme
- · Replies 3 ·
Graduate Length contraction and the expansion of the universe.
- mrspeedybob
- · Replies 2 ·
Graduate Am I accelerating while sitting on my chair in general relativity?
- ArthurB
- · Replies 7 ·
Graduate If CERN's claim is true, how would SR and GR change?
- zeromodz
- · Replies 1 ·
Undergrad If light has no weight, how can it push objects?
- Jarfi
- · Replies 68 ·
Graduate Faster than light and time travel into the past.
- AH_AHSAN
- · Replies 1 ·
Graduate What is proper acceleration measured against if not a privileged frame?
- fluidistic
- · Replies 13 ·
Graduate What can the rest frame of a neutrino possibly mean?
- Mosis
- · Replies 3 ·
Graduate Effect of gravity on time dilation.
- adrian53300
- · Replies 2 ·
Graduate Why not use relativistic mass in the momentum equation p=mvγ
- khil_phys
- · Replies 2 ·
Graduate Is Matter Ultimately Made Up of Photons?
- worwhite
- · Replies 27 ·
Graduate BH fall time = pi*m. What is external time?
- keithdow
- · Replies 20 ·
High School Does the distance to an object tell us how far back in time we see it?
- UnBoxedCat
- · Replies 7 ·
Graduate Neutrinos traveling faster than C?
- Northern
- · Replies 3 ·
Graduate Contraction of the Riemann Tensor with the Weak Field Metric
- JMedley
- · Replies 4 ·
Graduate Is Gravity a force or the chape of spacetime?
- tkav1980
- · Replies 3 ·
Graduate Does a tossed clock gain time relative to a stationary one?
- snoopies622
- · Replies 52 ·
Graduate Notation Convention: Primes in Coordinate Transformations
- Steely Dan
- · Replies 1 ·
Graduate Relativistic mass of falling body
- zonde
- · Replies 6 ·
Undergrad Why does the rest mass of an object increase when it's in motion?
- Freeze3018
- · Replies 8 ·
Graduate Relativistic Mass vs. Invariant Mass.
- DNMock
- · Replies 8 ·
Graduate Why isn't a position function a one-form if coordinates are a vector?
- HJ Farnsworth
- · Replies 13 ·
Graduate Resultant Gamma after Einstein velocity addition
- wil3
- · Replies 2 ·
Undergrad Self-learning special relativity
- nitro92
- · Replies 5 ·
Graduate Lorentz transformations formulas
- blueberrynerd
- · Replies 6 ·
Journal of cosmology and gravitation
- alejandrito29
- · Replies 4 ·
Graduate Why one-way light speed experiments measure only changes in speed
- whosapopstar?
- · Replies 23 ·
Graduate How Does Acceleration Affect Time Dilation in Twin Space Travel Scenarios?
- Agerhell
- · Replies 30 ·
Graduate Time/electromagntec spectrum and causality
- Mordred
- · Replies 6 ·
Graduate What exactly is compressed at very fast speeds?
- chaszz
- · Replies 14 ·
Graduate Using cadabra to calculate antisymmetric tensor field
- aries0152
- · Replies 7 ·
Graduate TIME DILATION. WHY do clocks that are
- abbott287
- · Replies 215 ·
Graduate What does it means to say two events are simultaneously observed?
- Fewmet
- · Replies 3 ·
Graduate Can Phase Velocity Exceed the Speed of Light and Enable Time Travel?
- byron178
- · Replies 11 ·
Graduate Solving Spaceship Chase Scene Relative Velocity Problem
- frerelupin
- · Replies 5 ·
Graduate Black hole falling time for external observer
- keithdow
- · Replies 1 ·
Undergrad Relations between kinetic energy, momentum and velocity
- new_r
- · Replies 9 ·
Graduate What is the outcome of the twin paradox in a new version?
- Agerhell
- · Replies 1 ·
Graduate Schwarzschild and Newton potential
- Passionflower
- · Replies 6 ·
Graduate Speed of light for different observers
- sisoev
- · Replies 139 ·
Graduate How could Einstein know the mirror reflection wouldn't disappear at light speed?
- spaghetti3451
- · Replies 3 ·
Graduate Divide in space and time component
- aries0152
- · Replies 6 ·
Graduate Is curved space allowed to show discontinuities (steps)?
- bahamagreen
- · Replies 3 ·
Graduate Visualizing Minkowski geometry
- dEdt
- · Replies 6 ·
Undergrad Regarding constancy of speed of light
- anupam1031
- · Replies 6 ·
Graduate Spacetime curvature and the force pulling an object down the curvature
- Trevormbarker
- · Replies 8 ·
Graduate Question on submanifolds of a semi-riemannian manifold
- PAllen
- · Replies 4 ·
Graduate Two identical black holes, but rotating in opposite directions collide
- Greglar
- · Replies 2 ·
Undergrad Is the speed of light any faster in low density space than in high
- keepit
- · Replies 11 ·
Graduate How emission theory was disproved by de sitter binary star experiment?
- techysafi
- · Replies 1 ·
Graduate Why is dU^b/dτ = U^a ∇_a U^b?
- MathematicalPhysicist
- · Replies 1 ·
Graduate Does a gravitating body have to undergo gravitational collapse?
- zonde
- · Replies 35 ·
Graduate Embedding spacetime analogy and intrinsic geometry of curved 3D space
- jmz34
- · Replies 2 ·
Undergrad Time Dilation: Impact on GPS Accuracy
- nordqvist11
- · Replies 4 ·
Graduate What is relativistic mass and does it change a spaceship's size?
- richerrich
- · Replies 3 ·
Graduate Changing Gravitational Effects of Rapidly Moving Objects
- CurvedSpace
- · Replies 2 ·
Graduate Susskind Lecture - accelerate reference frames
- csmcmillion
- · Replies 14 ·
High School Does acceleration magnitude affect sensation in free fall?
- rajeshmarndi
- · Replies 10 ·
Graduate Covariant global constants of motion in GR?
- tom.stoer
- · Replies 23 ·
Graduate What Causes Earth's Motion in General Relativity?
- ShayanJ
- · Replies 8 ·
Graduate The shape of space-time around a star
- RayYates
- · Replies 27 ·
Graduate Gravitational redshift, energy and the EP
- TrickyDicky
- · Replies 10 ·
Undergrad Does E=mc2 Work with Different Metric Systems?
- Jarfi
- · Replies 8 ·
Graduate Progress on detection of gravitational waves?
- Agerhell
- · Replies 2 ·
Graduate Field Energy and Time Dilation in Relativistic Motion
- keepit
- · Replies 3 ·
Graduate Why can we use metric tensors to lower index of Christoffel symbol
- ZealScience
- · Replies 15 ·
Graduate Does shortening a train in length contraction make light hit both ends simultaneously?
- agmateo
- · Replies 16 ·
Graduate Hafele and Keating, local gravity field as preferred frame?
- Agerhell
- · Replies 8 ·
Undergrad A Bus travelling at a very high speed.
- Naveen123
- · Replies 4 ·
Graduate Cosmological models with metrics and curvature tensors
- tom.stoer
- · Replies 1 ·
High School Gravitational Waves: Have They Been Directly Detected?
- dEdt
- · Replies 2 ·
Graduate Accelerating spaceship paradox
- yeknod71
- · Replies 3 ·
Graduate What is the path of earth in 4-d space?
- Rishavutkarsh
- · Replies 4 ·
Graduate Is Time Truly Relative in Physics?
- bleachigo
- · Replies 8 ·
Graduate Why is the sign in Einstein's equation's RHS often presented differently?
- TrickyDicky
- · Replies 4 ·
Graduate How Do Time Dilation and Ringdown Waves Affect Black Hole Merger Observations?
- zhermes
- · Replies 13 ·
Undergrad Classic and Relativity Kinetic Energy
- Kakorot
- · Replies 16 ·
Graduate How far does space-time bend out in space?
- johann1301
- · Replies 4 ·
Graduate Question regarding photons and mass
- Molecule
- · Replies 3 ·
Graduate Does a Black Hole Ever Collapse?
- CJames
- · Replies 22 ·
Graduate Old experiments with superluminal speed
- Molecule
- · Replies 3 ·
Graduate Does simulataneity contradicts the constancy of speed of light
- universal_101
- · Replies 5 ·
Graduate Planck constant is Lorentz invariant?
- keji8341
- · Replies 170 ·
Undergrad Gravitational waves predicted by Einstein
- BruceW
- · Replies 3 ·
Graduate Rotating black holes in Penrose diagrams
- relativityfan
- · Replies 11 ·
Graduate Does time run at infinity far from all gravitational fields?
- kakram
- · Replies 8 ·
Graduate Speed of two protons fired in opposite directions at 0.9c and 0.5c
- helios.jones
- · Replies 1 ·
Graduate Gravity Probe B / precession question
- elegysix
- · Replies 2 ·
Graduate Is the Speed of Light Really the Limit of the Universe?
- easyrider
- · Replies 2 ·
Undergrad How Does Time Dilation Explain the Twin Paradox?
- aglo6509
- · Replies 11 ·
Graduate General Relativity vs Geometrodynamics
- mhob
- · Replies 3 ·
Graduate Thomas precession magnitude and direction in orbital mechanics
- utesfan100
- · Replies 6 ·
Graduate How Can Two Black Holes Merge Within the Age of the Universe?
- Mordred
- · Replies 11 ·
Graduate Total gravity of all mass and energy in Universe.
- Mordred
- · Replies 7 ·