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 Do massive particles appear massless in a photon's reference frame?
- Sidnv
- · Replies 5 ·
Graduate Event horizon of elementary particles
- Rick89
- · Replies 2 ·
Graduate Can general relativity explain electron-electron repulsion?
- tmoan
- · Replies 3 ·
Undergrad Why do objects appear shorter and clocks run slower in space stations?
- MotoH
- · Replies 7 ·
Graduate Can spacetime be created ? if yes how if not why ?
- tell_me_why
- · Replies 4 ·
Undergrad Why must we travel through something at C?
- colbertsparro
- · Replies 8 ·
Graduate Can We Really Build a Time Machine with Today's Technology?
- tell_me_why
- · Replies 10 ·
Graduate Can Spinning the Earth Faster Reduce Gravity?
- YupHio
- · Replies 5 ·
Graduate Is There a Basic Element That Connects All Matter and Energy in the Universe?
- tell_me_why
- · Replies 13 ·
Graduate Gravitational field of photons
- espen180
- · Replies 32 ·
Graduate Is gravitational attraction finite?
- Codester09
- · Replies 5 ·
Graduate Energy in different references
- hisham.i
- · Replies 5 ·
Graduate Galileo and Lorentz transformation
- yinfudan
- · Replies 171 ·
Graduate Are Light Cones and Black Hole Event Horizons the Same?
- Hurkyl
- · Replies 5 ·
High School Why there are gravitation at all
- idrus91
- · Replies 10 ·
Graduate What Are the Different Perspectives on the Nature of Time?
- Prathyush
- · Replies 8 ·
Graduate Stationary below the event horizon?
- yuiop
- · Replies 12 ·
Graduate The Physical Meaning of the Relatvity of Simultaneity
- peteb
- · Replies 87 ·
Graduate Time Dilation/Gravitational Theories Needed for Short Film
- brett_f
- · Replies 15 ·
Graduate Space Time Curvature Question.
- futago92
- · Replies 4 ·
Graduate Changes in planet orbits as a star (eg. the Sun) decreases is mass.
- Jus
- · Replies 10 ·
The Meaning of Living in 3 Dimensions?
- ronandkryn
- · Replies 4 ·
Undergrad Can molecules exist in other dimensions?
- ronandkryn
- · Replies 2 ·
Undergrad Does light speed add up like velocities in a moving car?
- bil.a
- · Replies 4 ·
Graduate Christoffel symbol+covariant derivative+parallel transport
- jbusc
- · Replies 7 ·
Graduate Black Holes are Singularitiesor vice versa?
- FoxCommander
- · Replies 3 ·
Undergrad If light has no mass, how can it have energy according to e=mc2?
- Meatbot
- · Replies 56 ·
Graduate Why does Einstein say that a clock slows when it is moving?
- Grimble
- · Replies 32 ·
Graduate Bending of light and the travel distance
- Truth_Seeker
- · Replies 7 ·
Graduate How do we know nothing can go faster than c and why?
- joeschuler
- · Replies 3 ·
Graduate Is Relativistic Mass Plausible?
- planck42
- · Replies 73 ·
Graduate Calculating Time dilation in Accelerated systems
- Austin0
- · Replies 8 ·
Graduate Gravitational force vs. relativity
- crebigsol
- · Replies 11 ·
Graduate Doesn't relativity define time as an illusion?
- zeromodz
- · Replies 3 ·
Graduate Twin paradox with three inertial frames and symmetric accelerations
- edpell
- · Replies 4 ·
Graduate Can Gravitons Escape Black Holes?
- cgw
- · Replies 5 ·
Graduate Can geodesics around black holes form closed loops?
- ObsessiveMathsFreak
- · Replies 11 ·
Graduate Clocks running slower is an illusion
- YellowTaxi
- · Replies 31 ·
Graduate Can an Infinitely Long Rod Spinning at Light Speed Exhibit Relativistic Effects?
- rokimomi
- · Replies 3 ·
Graduate Galilean Transformations and Relativistic Physiology
- sfr1
- · Replies 2 ·
Graduate Frame of references in time dilation
- J Goodrich
- · Replies 1 ·
Graduate Force transformation laws and Newton's third law in special relativity
- jeffwu78
- · Replies 6 ·
Graduate How Do Planck Scale Dimensions Define Universal Limits?
- Orion1
- · Replies 2 ·
Graduate Interpreting Stress-Energy Tensor in General Relativity
- paweld
- · Replies 1 ·
Undergrad Does the length of a second change over Earth's history?
- asims216
- · Replies 2 ·
Graduate Relativity and time (twin paradox)
- Jonnyb42
- · Replies 10 ·
Graduate Speed of light vs speed of time
- markonline
- · Replies 6 ·
Graduate Assumptions about internal energy in Einstein's 1905 E=mc^2 derivation
- jwdink
- · Replies 8 ·
Graduate Why Does the Traveling Twin's Clock Show Less Time in the Twin Paradox?
- timpeac
- · Replies 29 ·
Undergrad Cutoff Point for Relativistic Effects
- pzona
- · Replies 9 ·
Graduate Do particles always reach speed c at the event horizon?
- DiamondGeezer
- · Replies 142 ·
Graduate Telling if a reference frame is moving or at rest
- yinfudan
- · Replies 11 ·
Graduate Superluminous Objects and Black Holes
- Bussani
- · Replies 3 ·
Graduate Alcubierre drive has trouble with quantum effects
- bcrowell
- · Replies 3 ·
Graduate Can Black Holes Exist? Physics Community Viewpoints
- Thinkor
- · Replies 9 ·
Graduate Mobile communication with electromagnetic waves and theory of relativity
- shyamalshukla
- · Replies 5 ·
Graduate Do particles without a rest mass bend spacetime?
- ZirkMan
- · Replies 13 ·
Graduate Detecting Gravity Waves Through Matter-Antimatter Collisions
- cragar
- · Replies 4 ·
Graduate Properties of Mass in Curved Space-Time
- danielatha4
- · Replies 4 ·
Graduate How Do Accretion Disks Around Black Holes Form and Function?
- vitus988
- · Replies 8 ·
Graduate What is the minimum mass required to distort space and time ?
- SBC
- · Replies 11 ·
Undergrad How is E=mc^2 connected to the speed of light?
- DeadCat_86
- · Replies 3 ·
Undergrad Where does the energy come from for gravitational work?
- AveekB
- · Replies 5 ·
Graduate 1905 paper Does the Inertia of a Body Depend Upon its Energy-Content?
- edpell
- · Replies 6 ·
Graduate Why is the subspace defined by ⟨ω,x⟩=constant linear in Hawking and Ellis?
- Manicwhale
- · Replies 2 ·
Graduate Is Time Altered in a Gravitational Field?
- quZz
- · Replies 21 ·
Undergrad How can gravity act without losing power as it propagates through mass?
- AeroJoe
- · Replies 10 ·
Graduate Physical meaning of index gymnastics
- gnieddu
- · Replies 8 ·
Graduate Lemaître metric coordinate singularity at the event horizon
- yuiop
- · Replies 12 ·
Graduate Gravitational waves and gravitation
- Ranku
- · Replies 5 ·
Graduate How can we say there is Zero G force in space what about SUN's G ?
- SBC
- · Replies 9 ·
High School Learn About the Alcubierre Warp Drive: A High Schooler's Guide
- Fawkes511
- · Replies 1 ·
High School Special Relativity and Distance/Space
- kgreen
- · Replies 7 ·
Graduate What physically contracts in Lorentz contraction?
- Ricke6
- · Replies 5 ·
Graduate Dust filled universe, is there a type of tension defined?
- Spinnor
- · Replies 2 ·
Undergrad Why is it called time dilation if time contracts in special relativity?
- timpeac
- · Replies 3 ·
Graduate The doppler effect and time dilation context
- ssope
- · Replies 12 ·
Graduate Could Our Universe Be Part of a Larger Cosmic Cycle?
- CrashDK
- · Replies 1 ·
Graduate Unique Distance on Pseudo-Riemannian Manifolds: Riccardo's Question
- Rick89
- · Replies 2 ·
Graduate What Aspects of General Relativity Challenge the Speed Limit of Light?
- Nusc
- · Replies 1 ·
Graduate Is your velocity constant in space-time?
- nasageek
- · Replies 6 ·
Graduate Einstein Vacuum Equation, Vacuum Constraint Equations
- bookworm_vn
- · Replies 2 ·
Graduate Isn't working with the relativistic Lagrangian AWFUL?
- AxiomOfChoice
- · Replies 16 ·
Graduate A bunch of LHC relativity questions
- teve
- · Replies 16 ·
Graduate Relativistic mass,momentum and energy.
- Urmi Roy
- · Replies 32 ·
Undergrad How does the swimmer analogy explain the movement of light in the ether?
- Fawkes511
- · Replies 6 ·
Undergrad Where does insufficient force go when accelerating a relativistic mass?
- pallidin
- · Replies 4 ·
Undergrad Why relativistic velocity addition matters at high speeds
- ssope
- · Replies 4 ·
Graduate How Does Relativity Affect Time Perception for Astronauts and Earth Observers?
- Kaimana
- · Replies 1 ·
Graduate Steel bar bisected by event horizon
- ACG
- · Replies 16 ·
Does a black hole cause light to move faster?
- Gamerex
- · Replies 20 ·
Graduate A simple SR question, but confusing to me
- jnorman
- · Replies 3 ·
Graduate Why does relativistic mass increase prevent acceleration to light speed?
- jonnyread
- · Replies 6 ·
Graduate Using light to see the world requires speed of light to be maximum?
- member 141513
- · Replies 23 ·
Graduate If the sun suddenly dissapeared.
- Willowz
- · Replies 13 ·
Undergrad How can both observers measure the other's clock running slow?
- anantchowdhary
- · Replies 2 ·
Graduate Issues with advanced Eddington-Finkelstein coordinates
- yuiop
- · Replies 6 ·
Graduate Understanding Gravity with Embedding Diagrams
- JAM-OTBOC
- · Replies 9 ·
Undergrad Does light from a moving spaceship travel faster relative to a stationary observer?
- blockstyl
- · Replies 9 ·
Graduate Dust filled universe but dust is a real field.
- Spinnor
- · Replies 6 ·