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 A spaceship moving near the speed of light
- Naveen3456
- · Replies 11 ·
Graduate Can the Speed of Light Fluctuate Due to Changes in the Vacuum of Space?
- Serge58
- · Replies 7 ·
Graduate Aging of four observers traveling at 0.9c with different paths
- Seminole Boy
- · Replies 19 ·
Graduate Black hole information paradox
- ArthurDent
- · Replies 44 ·
Graduate Does creeping ray explain light bending around the sun better than spacetime curvature?
- AkInfinity
- · Replies 2 ·
Graduate Is gravity just an illusion in the universe?
- Naveen3456
- · Replies 13 ·
Undergrad Why matter can't reach the speed of light ?
- big_bounce
- · Replies 40 ·
Graduate One-way speed of light and clock sync
- nikolakis
- · Replies 51 ·
Graduate Would Photon Clocks be possible?
- tinypositrons
- · Replies 6 ·
Undergrad Can continuous acceleration reach speed of light?
- vipinpsharma
- · Replies 14 ·
Graduate Concerning how quickly gravity takes to effect distant bodies
- acesuv
- · Replies 11 ·
Graduate Why can't we just use one theory for everything?
- uperkurk
- · Replies 7 ·
Undergrad Does relativistic time dilation combine with light-travel-time effects?
- meoryou
- · Replies 5 ·
Graduate Is the Twin Paradox Resolved by Considering the Metric of Spacetime?
- jaydnul
- · Replies 8 ·
Graduate Is there a simple way of deriving Lorentz transformation?
- dailin223
- · Replies 13 ·
Undergrad Time dilation and lorentz transformation
- nn542
- · Replies 11 ·
Graduate 4-force on a charged particle from the Faraday 2-form in GR
- quasar987
- · Replies 5 ·
Graduate Active and passive Lorentz transformation
- SpinorData
- · Replies 13 ·
Graduate Equation of Motion for a Point Mass Falling into an Infinitely Small Black Hole
- Binaryburst
- · Replies 16 ·
Graduate Why don't direction and path affect time dilation for the triplets?
- Seminole Boy
- · Replies 24 ·
Graduate Is time a physical dimension or just how we organize change?
- RealityQuest
- · Replies 7 ·
Graduate Relative acceleration of geodesics and spacetime curvature
- timmdeeg
- · Replies 21 ·
Undergrad What is the difference between separation in space and separation in time?
- enceladus_
- · Replies 15 ·
Graduate How do you calculate the stress-energy tensor in Einstein's field equations?
- zepp0814
- · Replies 2 ·
Graduate Photon Acceleration Near Gravitational Fields
- big_bounce
- · Replies 10 ·
Graduate Higgs Boson vs GR's Spacetime: Is Mass Effect Obsolete?
- zepp0814
- · Replies 3 ·
Graduate SR Vectors & Tensors: Transformations Explained
- quasar987
- · Replies 5 ·
Graduate EM Tensor Invariants - Are There More?
- BruceW
- · Replies 23 ·
Graduate Time in the reference frame of the photon and aswell curved spac
- Curious45
- · Replies 34 ·
Graduate Regular empirical evidence of curved space or massless photons?
- Curious45
- · Replies 19 ·
Graduate Possible mistake in an article (rotations and boosts).
- Fredrik
- · Replies 85 ·
Graduate How is C speed invariance - hows it suppose to work mechanically?
- Curious45
- · Replies 17 ·
Graduate How does the world look like after a Lorentz transformation?
- nick41
- · Replies 7 ·
Graduate Is the 4-velocity tangential to the worldline in Minkowski spacetime?
- Sunfire
- · Replies 19 ·
Graduate Gravitational time dilation from the metric
- bueller11
- · Replies 1 ·
Graduate Derivation of the Geodesic equation using the variational approach in Carroll
- silverwhale
- · Replies 7 ·
Graduate Diffeomorphic Invariance implies Poincare Invariance?
- FedEx
- · Replies 117 ·
Undergrad How Strong is the Gravity of a Black Hole Compared to Earth?
- uperkurk
- · Replies 1 ·
Graduate Acceleration to near light speed - where does the energy go?
- RagingPineapple
- · Replies 8 ·
Graduate Are there simplified theories explaining what gravity actually is?
- kiriri
- · Replies 9 ·
Graduate Metric constraints in choosing coordinates
- NanakiXIII
- · Replies 49 ·
Graduate Stars moving faster than the speed of light
- 42Physics
- · Replies 14 ·
Graduate Length contraction of space with multiple reference frames
- coktail
- · Replies 53 ·
Graduate How to reconcile photon not experiencing time with it's travel time?
- San K
- · Replies 6 ·
Graduate Metric tensor - index manipulation
- zn5252
- · Replies 2 ·
Graduate Momentum of Object in 0.6c Inertia Frame
- Outrageous
- · Replies 2 ·
Graduate Relativistic velocity and distance with constant 1g acceleration
- servo75
- · Replies 9 ·
Graduate Does a moving clock stop running when brought to rest at its destination?
- exmarine
- · Replies 7 ·
Graduate Do gravity and density have a direct relationship?
- mintparasol
- · Replies 22 ·
Graduate Freely Falling Inertial As Seen By Distant Inertial Observer
- 1977ub
- · Replies 4 ·
Graduate Does light experience time and how does the universe appear from light's perspective?
- jalsck
- · Replies 20 ·
Graduate Is the speed of light truly constant in all reference frames?
- ataraxic89
- · Replies 6 ·
Graduate Deriving Einstein tensor, Riemmann tensor step
- pleasehelpmeno
- · Replies 17 ·
Graduate Adding Velocities: Newbie Question on Special Relativity
- servo75
- · Replies 4 ·
Graduate What is most likely to be the actual explanation of gravity?
- VertexOperator
- · Replies 1 ·
Undergrad Do violent accelerations in a box mimic gravity uniformly for different masses?
- Buckleymanor
- · Replies 34 ·
Undergrad Are we moving at the speed of light?
- ebodet18
- · Replies 29 ·
Undergrad Question for Special Relativity
- 42Physics
- · Replies 2 ·
Graduate Gravitational time dilation in the center of a mass
- Xilor
- · Replies 5 ·
Graduate Contracting R_{αβ} to R^ρ_αβσ: No 16 Multiplier
- pleasehelpmeno
- · Replies 1 ·
Graduate Why there are no other kind of length contractions?
- smm
- · Replies 20 ·
Undergrad Point of reference in relative time
- EmilMasback
- · Replies 7 ·
Graduate Frame drag to accelerate spaceships?
- makc
- · Replies 6 ·
Undergrad Is the speed of light the same for all observers?
- Dewbo
- · Replies 14 ·
Graduate Does the Alcubierre drive accelerate or maintain constant velocity?
- codeman_nz
- · Replies 34 ·
Graduate Can Black Holes Truly Exist for Earth Observers?
- rjbeery
- · Replies 74 ·
Undergrad What time does space-time measure compared to a watch?
- robertito
- · Replies 10 ·
Undergrad C = √ (E/m) We can determine c
- ebodet18
- · Replies 3 ·
High School Is matter the same as mass in E=mc²?
- ebodet18
- · Replies 2 ·
Graduate What is the significance of the factor 8π in the Einstein Equations?
- NicosM
- · Replies 10 ·
Undergrad Do physics professors still misunderstand Einstein?
- terryl
- · Replies 30 ·
Graduate How can light reach another spaceship if it needs both horizontal velocity and speed c?
- richardparsons
- · Replies 2 ·
Graduate Speed of light measured in/by a parallel frame moving at c
- San K
- · Replies 2 ·
Graduate What is the maximum entropy a system can have based on its energy and size?
- michael879
- · Replies 39 ·
Graduate Question on hyperbolic rotation
- Sunfire
- · Replies 11 ·
Basic Lorentz Transform widget
- Dale
- · Replies 4 ·
Graduate What prevents mass-less gauge bosons and gravity going faster than c?
- Bararontok
- · Replies 7 ·
Graduate Would wormholes transmit gravity, if so how?
- Gulli
- · Replies 3 ·
Graduate Radial length contraction = mass anisotropy?
- Vincentius
- · Replies 27 ·
Graduate Are perfect fluid solutions physically real or coordinate-dependent?
- TrickyDicky
- · Replies 9 ·
Graduate Length contraction on charged wire
- port31
- · Replies 2 ·
Graduate Why is du/dτ the same for emitter and observer in Schwarzschild metric?
- MarkovMarakov
- · Replies 6 ·
Graduate The concept of inertial mass from Newton to Einstein
- James MC
- · Replies 14 ·
Graduate Is coupling G actually a constant of nature or it can vary?
- helpcometk
- · Replies 5 ·
Graduate Gravitational Pull Limit Across Distance?
- serp777
- · Replies 1 ·
Graduate What Causes Consistent Measurement of Light's Speed Despite Relative Motion?
- coktail
- · Replies 11 ·
Graduate Linearised gravity contraction
- pleasehelpmeno
- · Replies 20 ·
Undergrad Relativity: Observer's Perspective - Am I Getting it Right?
- Vincent Vespa
- · Replies 2 ·
Graduate Lorentz Contraction ?s and Implication
- Apophenia
- · Replies 46 ·
Graduate Contracting Tensors: Why G^αβ?
- pleasehelpmeno
- · Replies 6 ·
Graduate Is There an Error in the GR Problem? Join the Discussion!
- pleasehelpmeno
- · Replies 1 ·
Graduate How Liouville's theorem applies to gravitationally deflected light?
- Eduardo_GV
- · Replies 4 ·
Graduate Gravitational Time Dilation and Twin Paradox ?'s
- Apophenia
- · Replies 65 ·
Graduate Why do photons have momentum yet no mass?
- chestycougth
- · Replies 5 ·
Graduate The Pioneer effect and Spacecraft flyby anomaly
- SinghRP
- · Replies 13 ·
Graduate A few questions about light and relativistic effects
- coktail
- · Replies 22 ·
Graduate Antisymmetric and symmetric part of a general tensor
- center o bass
- · Replies 1 ·
Graduate New paradox in special relativity?
- djsourabh
- · Replies 8 ·
Graduate Special relativity from the frame of refrence of photon
- djsourabh
- · Replies 5 ·
Graduate Mathematics of MTW gravitation.
- center o bass
- · Replies 1 ·