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 Looking out the window of a fast ship
- Taremos
- · Replies 24 ·
Undergrad How fast does a clock tick at Earth's center compared to the surface?
- Johnny R
- · Replies 11 ·
Graduate Why does a moving observer see lightning flashes at different times?
- Santural
- · Replies 31 ·
Graduate Liftetime of photons in matter
- oyvindo
- · Replies 1 ·
Graduate Frame fields vs. Coordinate bases
- masudr
- · Replies 4 ·
Graduate Does gravitational waves participate in gravitation interaction?
- magnetar
- · Replies 2 ·
Graduate How is 3-space curved without a fourth spatial dimension?
- Robert100
- · Replies 2 ·
Graduate Some simple minded aspects of gravity
- oldman
- · Replies 18 ·
Undergrad Relationship between E=mc^2 and gravity
- pgcurt
- · Replies 14 ·
Graduate What is it about speed that affects time?
- Poita
- · Replies 19 ·
Graduate Can time dilation let a fast ship warn Alpha Centauri of danger?
- Pavel
- · Replies 40 ·
Graduate Does angular momentum approach infinity as a star collapses to a black hole?
- DBrant
- · Replies 2 ·
Graduate Which direction did they measure a meter?
- FatCat0
- · Replies 6 ·
Undergrad What do the variables mean in the Lorentz factor formula?
- Santural
- · Replies 4 ·
Graduate General Relativity vs Newtonian Mechanics
- ueit
- · Replies 5 ·
Graduate Is Acceleration Truly Relative or Absolute in the Context of General Relativity?
- fireball3004
- · Replies 14 ·
Graduate How Does Time Function as a Fourth Dimension in Our Solar System?
- Santural
- · Replies 7 ·
Graduate Gravitomagnetism and acceleration
- Xezlec
- · Replies 19 ·
Graduate What Is the Physical Meaning of the Torsion Tensor in General Relativity?
- tetraedro
- · Replies 9 ·
Graduate Has the Hawking-Penrose Debate Shaped Modern Physics?
- RJ Emery
- · Replies 1 ·
Graduate Why is the Einstein-Hilbert action the right choice for gravity?
- Terilien
- · Replies 4 ·
Graduate Are time and gravity essentially the same thing in general relativity?
- Dravish
- · Replies 60 ·
Graduate Can we define a full orbit without choosing a reference frame?
- MeJennifer
- · Replies 19 ·
Graduate Practical meaning of simultaneity calculations?
- Ookke
- · Replies 10 ·
Graduate Question About Speed of Light and Energy
- Arepo
- · Replies 13 ·
Undergrad How are the photoelectric effect and special relativity related?
- paradoxical67
- · Replies 6 ·
Graduate Understanding Velocity Transformation: A Crucial Factor in Particle Motion
- bernhard.rothenstein
- · Replies 8 ·
High School Does Earth's Gravitational Pull Increase with Object Proximity?
- hq2u
- · Replies 4 ·
Graduate How Does a Black Hole Affect the Human Body?
- pgcurt
- · Replies 2 ·
Graduate Why did Einstein define speed of light as a constant and time as a variable?
- EnumaElish
- · Replies 19 ·
Graduate Can All Clocks in an Inertial Frame Simultaneously Read Zero?
- bernhard.rothenstein
- · Replies 7 ·
Graduate Can non-gravitational forces cause time dilation and spacetime curvature?
- ngkamsengpeter
- · Replies 6 ·
Graduate Can Special Relativity Solve the Twin Paradox in a Gravitational Field?
- lightarrow
- · Replies 7 ·
Graduate GPS, GR, satellites and clock speed on the satellites
- OS Richert
- · Replies 21 ·
Graduate Temperature and speed of clocks
- Rothiemurchus
- · Replies 2 ·
Graduate Observing an astronaut falling into a black hole
- overlook1977
- · Replies 8 ·
Graduate What is the definition of general covariance ?
- pervect
- · Replies 5 ·
Graduate Photon wavelength in expanding universe
- JustinLevy
- · Replies 4 ·
Graduate How Can I Understand Slowly Rotating Perturbations of the Whittaker Metric?
- MstoneHall
- · Replies 3 ·
Graduate How Does General Relativity Explain Why We Always See the Same Side of the Moon?
- jimbobjames
- · Replies 1 ·
Undergrad Does gravity accelerate light or just bend its path?
- Nuclear on the Rocks
- · Replies 11 ·
Graduate Can you perturb a metric tensor and keep it valid?
- darashayda
- · Replies 20 ·
Graduate Can Adding a Constant to the D'Alembertian Maintain Relativistic Invariance?
- gulsen
- · Replies 2 ·
Graduate Schwarzschild black hole/kruskal extension
- dookie
- · Replies 12 ·
Graduate Relativistic Limit of Tardyon Momentum and Mass
- bernhard.rothenstein
- · Replies 21 ·
Graduate Spacetime, the Universe, the Present and the Future
- Seeker2K
- · Replies 6 ·
Graduate Challenging the Speed of Light: The Curious Case of Opposing Photons
- Tojen
- · Replies 32 ·
Graduate Why does the time dilation formula give a larger value for the moving frame?
- windscar
- · Replies 13 ·
Graduate Are time dilation from velocity and gravity cumulative?
- Johnny R
- · Replies 12 ·
Graduate Antisymmetrized tensor product
- Terilien
- · Replies 8 ·
Graduate Why hasn't Gravity Probe-B announced its results?
- magnetar
- · Replies 36 ·
Graduate Expressing second and its derivatives in terms of seven SI base units
- TurricaN
- · Replies 29 ·
Graduate Light's Instantaneous Wordline: Is Time Really Zero?
- OS Richert
- · Replies 4 ·
Graduate Twin paradox again (yes again)
- OS Richert
- · Replies 21 ·
Graduate What Are the Implications of Time Dilation on a Photon’s Speed and Perception?
- fireball3004
- · Replies 4 ·
High School What is the first result on Gravity Probe B?
- cosmopot
- · Replies 2 ·
Graduate Explain Independent Continuum: Einstein's Theory
- paradoxical67
- · Replies 8 ·
Graduate What is the mass of a photon and why does it have a mass?
- brianthewhitie7
- · Replies 17 ·
Graduate Question on Relativistic Doppler Shift
- arunma
- · Replies 6 ·
Graduate Why is Planck time measured differently from other dimensions?
- spizma
- · Replies 19 ·
Graduate Velocity Addition in MG and Light Scenarios
- bernhard.rothenstein
- · Replies 22 ·
Graduate Why should time be considered a 4th dimension?
- saderlius
- · Replies 95 ·
Graduate Is There an Absolute Rest Frame in a 2D Universe?
- Alkatran
- · Replies 58 ·
Looking for a relativity movie
- lalbatros
- · Replies 8 ·
Graduate Metric of supermassive black holes
- Rothiemurchus
- · Replies 2 ·
Graduate How Do CMB and Redshift Support Universe Expansion?
- bchui
- · Replies 1 ·
Graduate A scientist’s transmitter emits a wavelength
- ramcg1
- · Replies 34 ·
Thought experiment in space
- marlos jacob
- · Replies 55 ·
Undergrad Understanding the Impact of Mood on Perception
- Loren Booda
- · Replies 2 ·
Undergrad What is Einstein's thought experiment about special relativity?
- go9ers14
- · Replies 12 ·
Graduate Abraham Zelmanov's Chronometric Invariants
- MeJennifer
- · Replies 1 ·
Graduate Could Time Dilation Make Us Age Differently on Other Planets?
- bassplayer142
- · Replies 28 ·
Graduate Are There PDEs in Special Relativity?
- pivoxa15
- · Replies 1 ·
Graduate Some Inertial Frames may br more Equivalnet than Others
- yogi
- · Replies 6 ·
Graduate Understanding Relativity: Increasing Speed
- neolayman
- · Replies 9 ·
Graduate Two Body Problem: Exact Solutions?
- MeJennifer
- · Replies 3 ·
Undergrad I Need the explaination of The image of formation of black hole
- Huma waseem
- · Replies 7 ·
High School If I swing my arm, it can emit gravitational waves?
- magnetar
- · Replies 1 ·
Undergrad Transforming Kinetic Energy: A Geometric Approach
- bernhard.rothenstein
- · Replies 6 ·
Undergrad Why does time slow down for fast-moving objects in the twin paradox?
- regaldeath
- · Replies 3 ·
Graduate Black hole entropy as a Noether Charge
- haushofer
- · Replies 1 ·
Graduate Proving invariance of scalar product
- Gabor
- · Replies 4 ·
Graduate Implications of geodesiacs(philosophical)
- saderlius
- · Replies 25 ·
Graduate Four-vector potential in d'Alembertian equation
- neu
- · Replies 4 ·
Graduate Questions about the speed of light.
- Charlie X
- · Replies 7 ·
Graduate How to calculate invariant mass and energy in different reference frames
- Littlepig
- · Replies 28 ·
Graduate Detonator paradox: why do different frames disagree on collision order?
- fizzzzzzzzzzzy
- · Replies 2 ·
Graduate d'Alembertian operator applied to four-potential in EM
- neu
- · Replies 2 ·
Graduate What is the material that allows transverse but not longitudinal waves?
- Locrian
- · Replies 8 ·
Undergrad Twin #1 is calling twin #2 in mid flight on instant-stellar phone
- schwarg2
- · Replies 10 ·
Graduate Metric versus Tetrad formulation of relativity
- MeJennifer
- · Replies 3 ·
Graduate What is the Twin Paradox in General Relativity?
- MotolovCocktail
- · Replies 12 ·
Undergrad How do people truly understand special relativity?
- paradoxical67
- · Replies 17 ·
Undergrad Starting to learn about General and special relativity
- David_Harkin
- · Replies 2 ·
Graduate Double Special Relativity (DSR) fake or real?
- tpm
- · Replies 5 ·
Graduate Probably dumb question. problem understanding formula
- moe darklight
- · Replies 11 ·
Undergrad Is there a way to intuitively understand proper time in special relativity?
- minijumbuk
- · Replies 8 ·
Graduate The physical nature of spacetime
- jimbobjames
- · Replies 36 ·
Graduate Doppler shift formula and the assumptions behind it
- bernhard.rothenstein
- · Replies 8 ·
Graduate Is the first postulate necessary?
- CPL.Luke
- · Replies 10 ·