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 Visual and aging effects from a rapidly rotating disc
- firefox5926
- · Replies 4 ·
Undergrad How Do High Velocity Objects Influence Time Dilation?
- keepit
- · Replies 1 ·
Graduate The three vectors in the Null Geodesic equation
- Philosophaie
- · Replies 8 ·
Graduate Why don't gravitational waves get distorted?
- Naty1
- · Replies 7 ·
Graduate Is the current black hole horizon observable?
- Naty1
- · Replies 4 ·
Graduate Simultaneity and Spacelike Interval
- anxmetal
- · Replies 2 ·
Graduate What Geometrical Symmetry Do FRW Metrics Exhibit?
- TrickyDicky
- · Replies 6 ·
Graduate Mini Black Hole Loose on Earth, eek
- Phrak
- · Replies 15 ·
Undergrad Time Dilation and the Flawed World Record Attempt: A Physics Explanation
- anxmetal
- · Replies 2 ·
Graduate Does mass exert gravity directly or does warped space?
- Diezehl
- · Replies 21 ·
Undergrad Time dilation and length contraction for fast spaceship travel
- Tomer
- · Replies 44 ·
Graduate Definition of local inertial frame
- eudo
- · Replies 14 ·
Graduate Wormholes - A way to violate energy conservation?
- MrNerd
- · Replies 27 ·
Graduate The use of electromagnetic resonance to distort space time
- Mcgilvrey007
- · Replies 4 ·
Graduate Is Static Gravity Effectively Modeled as a Two-Form in Static Systems?
- pervect
- · Replies 10 ·
Undergrad Relativistic Doppler shift practice exercises
- Mr. Heretic
- · Replies 5 ·
Undergrad Electron speed after acceleration in uniform electric field
- new_r
- · Replies 13 ·
Undergrad N-body problem simulation and relativity
- alyx_vance
- · Replies 14 ·
Graduate Does GR remain in a universe without matter?
- only1universe
- · Replies 19 ·
Undergrad Does Light Still Travel at c Above .9c?
- easyrider
- · Replies 22 ·
Graduate Is time travel to the past or travel to a multiverse possible?
- tim22
- · Replies 2 ·
Graduate What do basis vectors represent at a point in curved spacetime?
- teddd
- · Replies 41 ·
Graduate Does gravity bend around massive objects like light does?
- Philosophaie
- · Replies 2 ·
Graduate Speed, Time and Events: How to Keep Up?
- rajeshmarndi
- · Replies 4 ·
Graduate Black holes in tetrad formalism
- inline
- · Replies 2 ·
Graduate What scientific principles allow time travel to be possible?
- Theseus
- · Replies 89 ·
Graduate Temperature within the epicenter of a Black hole.
- Mordred
- · Replies 8 ·
Graduate Time dilation on a 20 light-year round trip at 0.9c
- tom_mi
- · Replies 9 ·
Graduate Light from the sun takes 8 minutes, but is less time passing for the photon?
- gandr13189
- · Replies 22 ·
Graduate Geometry and long space travel
- chaszz
- · Replies 3 ·
High School Why kicking nested machines in space doesn't reach light speed
- nasgath
- · Replies 14 ·
Graduate What is a positive definition of space and time?
- rasp
- · Replies 16 ·
Graduate How does the Einstein tensor contribute to the equations of motion in 4d?
- alejandrito29
- · Replies 6 ·
Graduate Einstein simultaneity train thought
- rajeshmarndi
- · Replies 13 ·
Undergrad Time dilation, mirror question
- ucsdhopeful
- · Replies 2 ·
Graduate Why did Einstein develop spacetime curvature and Mercury's orbit?
- rajeshmarndi
- · Replies 1 ·
Graduate Vaidya/Lemaitre-Tolman metrics
- pierrecurie
- · Replies 9 ·
Graduate Cuurent statuses of theories of gravity
- chaszz
- · Replies 4 ·
Graduate Speed muons must travel to reach Earth's ocean floor
- liquidFuzz
- · Replies 7 ·
Graduate How Can Energy Density Be Calculated from a Metric in General Relativity?
- utesfan100
- · Replies 7 ·
Graduate Gravitational index of refraction
- Helios
- · Replies 9 ·
Graduate Which GR textbook to start with: Hartle, Schutz, or Ohanian
- Elwin.Martin
- · Replies 2 ·
Graduate Still learning about tensors
- grzz
- · Replies 30 ·
Graduate Mass to energy conversion at fraction of speed of light
- San K
- · Replies 4 ·
Undergrad Why can't we time travel in backward?
- Arjun Ar
- · Replies 25 ·
Graduate Time-like Intervals and Causality
- *FaerieLight*
- · Replies 1 ·
Graduate What is the Belt Paradox in Interferometrics Cart Phenomenon?
- jaquecusto
- · Replies 10 ·
Graduate Camera near the speed of light
- Voltaire6022
- · Replies 44 ·
Graduate Can two metrics be superposed?
- inottoe
- · Replies 6 ·
Graduate General Relativity at the microscopic level
- lavinia
- · Replies 2 ·
Graduate When the Schwarzschild radius is inside the star
- lavinia
- · Replies 7 ·
Graduate Why the pole doesn't crash through the room at relativistic speed
- moe darklight
- · Replies 19 ·
Graduate Pioneer anomaly resolved by reflective thermal model
- bcrowell
- · Replies 39 ·
Graduate Deriving EFE from the Bianchi Identities
- jfy4
- · Replies 16 ·
Graduate How do I calculate time dilation due to acceleration in SR please?
- rede96
- · Replies 2 ·
Undergrad Gravity and other fundamental forces
- rajeshmarndi
- · Replies 3 ·
Graduate Covariant and Contravariant Kronecker Delta operating on Tensor
- lewis198
- · Replies 7 ·
Graduate Does gravity have effects through time?
- guss
- · Replies 16 ·
Graduate Why is a static spacetime defined by a hypersurface orthogonal Killing vector?
- off-diagonal
- · Replies 9 ·
Physics Forums logo contest: Theory of relativity and E=mc²
- micromass
- · Replies 31 ·
Graduate Deriving the Schwarzschild Metric
- JDoolin
- · Replies 7 ·
Graduate Difficulty in learning tensors
- grzz
- · Replies 7 ·
Graduate I forgot what this is called and what is is written out.
- LostConjugate
- · Replies 5 ·
Graduate Concerning the importance of preffered time coordinates
- femtofranco
- · Replies 1 ·
Graduate GR Class: Is it Enough to "Know" General Relativity?
- nlsherrill
- · Replies 6 ·
Undergrad Why does relativistic velocity addition depend on light speed?
- bodhi
- · Replies 2 ·
Undergrad What would observers on relativistic balls see of each other?
- Mustakafine
- · Replies 27 ·
Graduate Do Gravity Waves Influence Quantum Particles and Dark Matter?
- mrspeedybob
- · Replies 11 ·
Graduate Relativistic momentum derivation via particle collision
- jimbobian
- · Replies 6 ·
Graduate What happens if the Lorentz factor is omitted from the time equation?
- bodhi
- · Replies 9 ·
Graduate Cygnus X-1 is nearly extremal.
- bcrowell
- · Replies 8 ·
Graduate Train bomb timer and ground clocks at 0.6c
- EricD516
- · Replies 9 ·
Graduate Einstein's Train and Lightning Bolt Simultaneity Situation
- highschoolkid
- · Replies 5 ·
Graduate Tensor transforming law problem / metric-delta contraction
- teddd
- · Replies 3 ·
Graduate Einstein Tensor Divergence Proof: How to Show it is Divergence-Free?
- teddd
- · Replies 3 ·
Graduate What would the universe be like if c were not uniform
- bobsmith76
- · Replies 15 ·
Undergrad Understanding Einstein's E=mc^2 Theory
- taylrl3
- · Replies 21 ·
Undergrad Gravitational Force on a Body: Is it Absolute?
- skanda9051
- · Replies 5 ·
Undergrad Why is a black hole's gravity stronger than a star's if the mass is the same?
- scilover89
- · Replies 28 ·
Graduate Derivation of Relativistic Momentum WITHOUT using Relativistic Mass?
- SamRoss
- · Replies 11 ·
Graduate Gravitation and Space Time warps
- Lazernugget
- · Replies 10 ·
Graduate Rocket-man measuring speed of light
- quantizedzeus
- · Replies 2 ·
Undergrad Reducing relativistic momentum equation to frame velocity form
- jimbobian
- · Replies 6 ·
Graduate Can Exceeding the Speed of Light Reverse Cause and Effect?
- ZealScience
- · Replies 7 ·
Graduate Twin Paradox with no asymmetry
- joeh1971
- · Replies 10 ·
Graduate Time travel by going fast in a spaceship: questions
- tufflax
- · Replies 3 ·
Undergrad Check my relativity video explaining light's constant speed
- zimbabwe
- · Replies 5 ·
Graduate Lorentz contraction in other dimensions?
- Trifis
- · Replies 16 ·
Graduate The General Relativity Metric and Flat Spacetime
- Anamitra
- · Replies 78 ·
Graduate Godel and The Philosophy of Special Relativity
- bobc2
- · Replies 26 ·
Undergrad Calculating Solution to Sketch: Help Needed
- liquidFuzz
- · Replies 6 ·
Graduate Can we have a dedicated thread for FAQ requests?
- tltmts
- · Replies 11 ·
Graduate Bullet-hole Paradox: Train Frame & Stopped Train Measurements
- NSEFF
- · Replies 16 ·
Graduate Find Poincare Transform for Momentarily Co-Moving Reference Frame
- phatm
- · Replies 7 ·
Graduate Can We Manipulate Space-Time with Different Types of Energy?
- space guy1
- · Replies 1 ·
Graduate Michelson-Morley experiment(s)
- fluidistic
- · Replies 6 ·
Graduate Two different velocity variables in relativistic momentum?
- SamRoss
- · Replies 5 ·
Undergrad Magnetism to test for movement?
- sachin123
- · Replies 9 ·
Graduate Not Understanding Time Dilation.
- The New Guy
- · Replies 29 ·
Graduate Creating a Target with 3 Photons in SR Propagating Sphere of Light
- Reff
- · Replies 120 ·