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 Why is the Speed of Light Squared in Special Relativity?
- Swampeast Mike
- · Replies 39 ·
Graduate How can we physically travel through time?
- Rook225
- · Replies 6 ·
Graduate Why does rest energy include c squared if the particle isn't moving?
- asdf1
- · Replies 17 ·
Graduate Can the speed of light be considered an absolute?
- neopolitan
- · Replies 4 ·
Undergrad Why the michelson-morley experiment is not reliable
- johanen
- · Replies 3 ·
Undergrad Why is the Speed of Light Squared in E=mc^2?
- free_mind
- · Replies 78 ·
Graduate Speed Of Light and stimilation
- Spin_Network
- · Replies 2 ·
Graduate Question from Rindler's Introduction to Special Relativity
- learningphysics
- · Replies 5 ·
Graduate How Time Stands Still: r=GM/c^2
- gunblaze
- · Replies 2 ·
Graduate Proving Energy-Momentum Tesor Relation
- samalkhaiat
- · Replies 2 ·
Graduate Reimagining Science: Space, Time, and Gravity in a New Light
- dgoodpasture2005
- · Replies 2 ·
Undergrad The attraction of light by gravity
- The Sphinx
- · Replies 4 ·
Graduate Traveling Fast and Infinite Mass
- Cladson
- · Replies 4 ·
Undergrad Everything in the universe is related
- Caesar_Rahil
- · Replies 10 ·
Graduate What Explains the Variation in Gamma-Ray Burst Spectral Time Lags?
- wolram
- · Replies 6 ·
Graduate Where do gravitational waves fit in the electromagnetic spectrum?
- Vast
- · Replies 7 ·
Graduate Minkowski space, non-Euclidean geometry, and rotating frames
- dekoi
- · Replies 2 ·
Undergrad Can gravitons travel in a vacuum?
- bola
- · Replies 6 ·
Undergrad Explaining time dilation and the twin paradox to a skeptic
- GSwindle
- · Replies 2 ·
Graduate Some conceptual questions on SR
- Reshma
- · Replies 14 ·
Graduate Can tachyons travel backward in time if they exceed light speed?
- Caesar_Rahil
- · Replies 6 ·
Graduate Traveling to the Future with Speed of Light - Can it be True?
- gunblaze
- · Replies 3 ·
Graduate Why did Einstein try to unify GR and EM if SR already made EM consistent?
- εllipse
- · Replies 2 ·
Graduate Place to discuss the Theory of Relativity
- Daminc
- · Replies 98 ·
Graduate Einstein's Belief: Everything Moving at Speed of Light?
- RAD4921
- · Replies 7 ·
Graduate Lorentz Contraction of a Rotating Object
- SahinTC
- · Replies 15 ·
Graduate Time and the Sound Barrier: How Fast is Too Fast?
- Tjl
- · Replies 9 ·
Graduate What Is Minkowski's Geometric in Relativity
- yukcream
- · Replies 2 ·
Graduate Gravity of Light: Can a Laser Beam Generate Its Own Field?
- Iridium
- · Replies 5 ·
Graduate Could a spaceship escape a black hole using fuel?
- melknin
- · Replies 30 ·
Graduate Can absolute space and time explain relativistic effects?
- Eppur si muove
- · Replies 15 ·
Graduate J Baez' The meaning of Einstein's Equations
- DaTario
- · Replies 5 ·
Graduate Is time relative for each observer in motion?
- Jeremy
- · Replies 35 ·
Graduate How to calculate speed of gravity in GR?
- cefarix
- · Replies 2 ·
Undergrad Why do motionless objects gravitate toward each other?
- shrumeo
- · Replies 7 ·
Graduate The difference between felt, and unfelt motion.
- LosBoogie
- · Replies 11 ·
Graduate Why Minkowski spacetime and not Euclidean spacetime?
- cefarix
- · Replies 10 ·
Undergrad How do you explain the twin paradox to a friend
- GSwindle
- · Replies 3 ·
Graduate Minkowski spacetime interval's Lorentz invariance
- cefarix
- · Replies 2 ·
Graduate How do general relativity and quantum mechanics contradict each other?
- abercrombiems02
- · Replies 2 ·
Graduate Experiences of particles moving at relativistic speeds in non-vacuum
- ACG
- · Replies 6 ·
Graduate Does Quickly Moving Object Have More Gravitational Mass?
- LeonhardEuler
- · Replies 5 ·
Undergrad What Are Gravity Waves and How Do They Work?
- amt
- · Replies 30 ·
Graduate Resolving the Twin Paradox: A Mathematical Approach
- rczmiller
- · Replies 3 ·
High School What is general relativity really about?
- yukcream
- · Replies 3 ·
Graduate Postulates and assumptions in the Lorentz equations derivation
- Aer
- · Replies 13 ·
Undergrad The Speed of Light: Theory of Special Relativity
- Rainbow
- · Replies 8 ·
High School What in the world does E =mc2 mean?
- Matthias765
- · Replies 32 ·
Graduate Do Massless Particles Like Gravitons Interact With the Higgs Field?
- nabodit
- · Replies 26 ·
Graduate Energy in a volume changing the geometry
- DaTario
- · Replies 28 ·
High School Twin Born On Earth and in Space - Age Difference
- aznpride2pac
- · Replies 8 ·
Graduate Theory of General Relativity: Reason for Heavenly Bodies Creating Spacetime Dent
- Rainbow
- · Replies 4 ·
Graduate Gravity Probe B: Gyroscope Orientation and Precession
- Paulanddiw
- · Replies 2 ·
Graduate Understanding Relativistic Kinetic Energy in Lab Experiments
- Pengwuino
- · Replies 2 ·
Graduate Twin paradox, live via satellite
- Pengwuino
- · Replies 10 ·
Graduate Questioning Relative Mass Magnification by a Moving Observer
- DaTario
- · Replies 2 ·
Graduate Blackhole decay and gravitational wave
- nabodit
- · Replies 7 ·
Undergrad Is the Big Bang Theory Misunderstood in Terms of Expansion and Gravity?
- yourdadonapogostick
- · Replies 9 ·
Graduate GR resolves galactic rotation without dark matter
- selfAdjoint
- · Replies 5 ·
Graduate Is the Twin Paradox Misunderstood in Terms of Aging Differences?
- DaTario
- · Replies 5 ·
Graduate Angular momentum at near-c velocities
- Mortimer
- · Replies 10 ·
Graduate What are the prerequisites for understanding Lorentz transformations?
- preet0283
- · Replies 4 ·
Graduate Can particles and geometry coexist in gravitational theory?
- mewmew
- · Replies 3 ·
Graduate Fermi-Walker transport - problem with a minus sign
- mikeu
- · Replies 3 ·
Graduate Does relativistic mass increase perpendicular to motion?
- Antiphon
- · Replies 16 ·
Graduate How to measure the length of a moving rod in special relativity
- paco1955
- · Replies 4 ·
Graduate Prove rectilinear motion given four-acceleration and four-velocity?
- learningphysics
- · Replies 6 ·
Graduate Why relativity of simultaneity makes events non-simultaneous in different frames
- theelusivecamel
- · Replies 3 ·
Graduate Noether's theorem and Time invariance?
- raid517
- · Replies 4 ·
Graduate Special Relativity and Mass Variation
- rczmiller
- · Replies 14 ·
Graduate Hawking on Euclidean quantum gravity for nonperturbative physics
- CarlB
- · Replies 2 ·
Graduate Prove Tidal Distortion Volume Conservation Mathematically
- cygnus2
- · Replies 2 ·
Graduate Time machines and rotating cylinders
- DaveC426913
- · Replies 2 ·
Graduate What do we know about gravitation?
- professor
- · Replies 14 ·
Undergrad Why is gravity described as bending space instead of just an attractive force?
- questionauthority
- · Replies 9 ·
Graduate An old new kind of observer dependency: is v > c possible if nobody was looking?
- EnumaElish
- · Replies 3 ·
Graduate Accomodating relativity to dark matter
- Loren Booda
- · Replies 3 ·
Graduate Wave equation for light in curved spacetime
- dand5
- · Replies 5 ·
Graduate Is Time a Dimension or a Field?
- pattylou
- · Replies 9 ·
Graduate H and Infinity: What Happens to Time and Distance at the Event Horizon?
- Draya22
- · Replies 9 ·
Graduate Why Must the Universe Expand or Contract According to General Relativity?
- Symbreak
- · Replies 2 ·
Graduate General Relativity and EM - Heim Theory
- Antiphon
- · Replies 1 ·
Graduate Einstein's:Mass increase resulting from Acceleration increase
- Spin_Network
- · Replies 30 ·
Graduate Is Rotation in x and y Invariant at the Origin in a Rotating Coordinate System?
- pervect
- · Replies 6 ·
Graduate Contraction index for Ω·e in Fermi normal coordinates
- mikeu
- · Replies 4 ·
Graduate Gravity doughnut may solve time travel problem
- Ivan Seeking
- · Replies 3 ·
Graduate Fermi-Walker transport non-rotating particle
- pervect
- · Replies 7 ·
Graduate Gravitational redshift +blackbody spectrum
- virtual
- · Replies 2 ·
Graduate Can spacetime as a rubber sheet be taken literally or merely as pedagogic?
- EnumaElish
- · Replies 25 ·
Graduate How Does General Relativity Explain the Motion of Earth and Light?
- mxur
- · Replies 2 ·
Undergrad General Relativity in the Undergraduate Physics Curriculum
- ZapperZ
- · Replies 30 ·
Graduate Relativity - facing backwards on a train
- rczmiller
- · Replies 9 ·
Undergrad Why does light accelerates after being slowed down
- ludi_srbin
- · Replies 12 ·
Graduate Why Do Photons Travel at the Speed of Light?
- ludi_srbin
- · Replies 4 ·
Graduate C constant to the observer as well?
- neurocomp2003
- · Replies 2 ·
Graduate General Relativity Postulates and History of Publication
- εllipse
- · Replies 5 ·
Undergrad Will Pushing One End of a 2 Light Second Rod Move the Other End?
- waht
- · Replies 2 ·
Graduate The effect of wormholes on photons
- professor
- · Replies 2 ·
Graduate Proofing a few paragraphs on relativity
- jason_one
- · Replies 6 ·
Graduate Light in a Black Hole: Does It Escape or Lose Energy?
- Päällikkö
- · Replies 9 ·