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.
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Graduate Special Relativity, four-momenta questions.
- peripatein
- · Replies 13 ·
Undergrad Gravitational redshift versus cosmological redshift
- acesuv
- · Replies 1 ·
Graduate Equation for Bob's time axis on Alice's spacetime diagram
- v3ra
- · Replies 3 ·
Undergrad Why things like relativity and evolution aren't called laws?
- jaydnul
- · Replies 3 ·
Graduate How do you determine which clock measures proper time?
- Volcano
- · Replies 15 ·
Graduate Why is there a negative sign in the spacetime interval formula?
- moatasim23
- · Replies 27 ·
Graduate Are classical models of electrons with spin limited by the speed of light?
- michael879
- · Replies 9 ·
Undergrad Does the law of universal gravity exist?
- michael92
- · Replies 16 ·
Graduate Why doesn't Earth spiral into the Sun if spacetime curvature causes orbits?
- surprise
- · Replies 20 ·
Graduate Are all objects crossing the event horizon travelling at C?
- Stonius
- · Replies 28 ·
Graduate How many independent components are there in the Einstein equations?
- maxverywell
- · Replies 6 ·
Graduate Finding velocity and gamma factor from 7 TeV proton kinetic energy
- Abigale
- · Replies 2 ·
Graduate Why Don't Earth and the Moon Emit Gravity Waves Like Neutron Stars?
- enceladus_
- · Replies 7 ·
Graduate Is there a minimum mass for black holes?
- JK423
- · Replies 5 ·
Graduate Time Dilation Video Feed Experiment
- zinzin
- · Replies 5 ·
Graduate A perfectly flat bucket of water?
- Wes Tausend
- · Replies 24 ·
Graduate Can Affine Parameters Be Used to Describe Null Curves in GR?
- center o bass
- · Replies 7 ·
Graduate The Modern Geometric View of Black Holes
- center o bass
- · Replies 16 ·
Undergrad Why do different sources give different formulas for invariant interval?
- ash64449
- · Replies 17 ·
Graduate What is Minkowski Space and Its Role in Understanding Relativity?
- ash64449
- · Replies 28 ·
Undergrad Why measuring one-way trip impossible?
- ash64449
- · Replies 43 ·
Graduate Does Velocity or Acceleration Determine the Energy of a Moving Object?
- DiracPool
- · Replies 63 ·
Graduate Does the metric tensor determine gravitational field strength?
- 49ers2013Champ
- · Replies 3 ·
Graduate What Ingredients Can Make an Observer?
- bcrowell
- · Replies 1 ·
Graduate Is the Cosmic Microwave Background an Absolute Frame of Reference?
- mrcotton
- · Replies 7 ·
Graduate Is spacetime independent of its universe?
- Seminole Boy
- · Replies 73 ·
Graduate Time Dilation Thought Experiment
- mcjosep
- · Replies 4 ·
Graduate Is a Universal Clock Possible? Answers Here
- jalak7
- · Replies 5 ·
Graduate Speed of light and relations to mass
- chgol5270
- · Replies 5 ·
Graduate What math do you need to know to solve EFE
- Pseudo Epsilon
- · Replies 4 ·
Graduate When is something Lorentz invariant.
- Dreak
- · Replies 1 ·
Graduate Anisotropic instead of isotropic metric deriving acceleration
- Agerhell
- · Replies 2 ·
Graduate Understanding Classical Fields in General Relativity
- TrickyDicky
- · Replies 16 ·
Graduate When is space curvature large and when is it small?
- Ahmed Samra
- · Replies 30 ·
Graduate Why does the Minkowski metric have a negative sign on the time term?
- shounakbhatta
- · Replies 36 ·
Graduate Energy shift in a photon passing by a gravitational well
- elevin
- · Replies 12 ·
Graduate Can the No-Interaction Theorem Coexist with Relativistic Particle Dynamics?
- J.F.
- · Replies 12 ·
Graduate The ratio between temporal lengths is frame-invariant
- Philosoph
- · Replies 8 ·
Undergrad Can we say space and time curve around matter instead of matter curves spacetime?
- 49ers2013Champ
- · Replies 10 ·
Graduate Deriving Relations in Relativistic Mechanics: dE/dt = dm/dt?
- exmarine
- · Replies 5 ·
Graduate I'm standing on a black hole, is light approaching red or blue?
- elevin
- · Replies 40 ·
Graduate Relation between coordinate time and proper time
- ash64449
- · Replies 78 ·
Graduate Relativity of simultaneity with synchronized train cameras
- DevilsAvocado
- · Replies 18 ·
Graduate Redshifting of forces in stationary space - times
- WannabeNewton
- · Replies 66 ·
Graduate Principle of relativity hypothetical question
- kuulbots
- · Replies 7 ·
Graduate Can Light Travel Faster When Moving Towards It?
- edraganov
- · Replies 5 ·
Graduate How Does Relativity Explain Different Observations of the Same Event?
- Jarvis323
- · Replies 7 ·
Graduate Solve Boggling Questions on Relative Speed of Light and Time Dilation
- AshsZ
- · Replies 1 ·
Graduate Finding Radius of Curvature of a Sphere Using Angle Excess
- pervect
- · Replies 3 ·
Graduate Local flatness at r = 0 for star interior spacetime
- FunkyDwarf
- · Replies 3 ·
Graduate He most general form of the metric for a homogeneous, isotropic and st
- MarkovMarakov
- · Replies 6 ·
Graduate Relativity of simultaneity and parthood?
- durant
- · Replies 39 ·
Graduate Why can't a spaceship pass through spacetime curved by the sun's mass?
- VeryConfusedP
- · Replies 17 ·
Undergrad Why does an apple fall with me in orbit but orbit me in deep space?
- Paintjunkie
- · Replies 15 ·
Graduate Travelling the Same speed as a photon
- rabcarl
- · Replies 14 ·
Graduate Gravity: after Einstein, is it really a force?
- Phenylflux
- · Replies 3 ·
Graduate Can you modify this quote regarding time dilation?
- 49ers2013Champ
- · Replies 3 ·
Graduate Do photons warp space like the equivalent energy as mass would?
- bcrelling
- · Replies 18 ·
Graduate Understanding Reference Frames for Observing Real-Time Events
- durant
- · Replies 5 ·
Graduate What is the current explanation for apparent superluminal jets?
- easyrider
- · Replies 2 ·
Graduate Why Use Earth's Center as a Time Reference in Atomic Clock Experiments?
- bwana
- · Replies 14 ·
Graduate NASA Solar Probe Plus to hit 0.067% of c
- zincshow
- · Replies 5 ·
Graduate How long would it take to get to Alpha Centauri?
- yoyopizza
- · Replies 14 ·
Graduate What are the physical mechanisms behind time dilation and its alternatives?
- lakshminarayan
- · Replies 31 ·
Graduate Can Colliding Stars Form a Black Hole Made of Light?
- A.T.
- · Replies 10 ·
Graduate Spacetime Physics (1966) Fig 23 on page 40
- Hacky
- · Replies 2 ·
Graduate Free-falling frame and surface frame as inertial reference frames
- JPaquim
- · Replies 7 ·
Graduate The relativistic mechanics of spinning discs
- jartsa
- · Replies 16 ·
Graduate Twin paradox with asymmetric acceleration and clock synchronization
- JohnWisp
- · Replies 59 ·
Undergrad Is the SparkNotes derivation of length contraction correct?
- ash64449
- · Replies 24 ·
Graduate Travelling towards distant stars
- User11037
- · Replies 16 ·
Graduate Constructing the Einstein Field Equation
- MarkovMarakov
- · Replies 2 ·
Graduate Second derivative of a metric and the Riemann curvature tensor
- MarkovMarakov
- · Replies 1 ·
Graduate Lorentz, simultan, radar finds dust grain, inconsistencies
- Albertgauss
- · Replies 5 ·
Graduate Quote about movement through spacetime that is confusing me:
- VeryConfusedP
- · Replies 6 ·
Graduate Simultaneity in Special Relativity
- disgradius
- · Replies 8 ·
Graduate Question on relativity of movement
- Gerinski
- · Replies 12 ·
Graduate Relativistic Forces: Confirm Resnick's Results?
- exmarine
- · Replies 6 ·
Graduate Evidence of Electromagnetic fields causing spacetime curvature?
- physwizard
- · Replies 9 ·
Undergrad Is the Einstein equation E=Mc^2 correct?
- michaelser
- · Replies 7 ·
Graduate Time Travel, Space Travel, Speed The Earths Movement, Speed Of Light
- phys-if
- · Replies 3 ·
Undergrad Why speed of light is measured same regardless of their speed?
- adjacent
- · Replies 96 ·
Graduate Constant acceleration from accelerated observer's perspective
- Whovian
- · Replies 3 ·
Graduate Kruskal Diagram Hyperbola Function
- philipp2020
- · Replies 4 ·
Undergrad Relativity and the speed of time
- spaceanon
- · Replies 25 ·
Graduate Well-posed initial value formulation for Maxwell's equations in curved spacetime
- WannabeNewton
- · Replies 20 ·
Graduate What does K·K = 0 mean in gr-qc/9611042v1?
- Mentz114
- · Replies 2 ·
Graduate Is the GR explanation for how gravity moves things?
- bcrelling
- · Replies 16 ·
Graduate Why isn't there such a thing as an invariant velocity for all objects?
- Xilor
- · Replies 12 ·
High School Why does a clock at the mountain run faster than one at sea level?
- Ahmed Samra
- · Replies 10 ·
High School Will a Sun Collapse Form a Black Hole?
- Ahmed Samra
- · Replies 3 ·
Graduate In a growing-mass universe, would we see red shift or blue shift?
- nurica
- · Replies 16 ·
Graduate Einstein and Newton and gravity
- Ahmed Samra
- · Replies 3 ·
High School Will the sun get smaller and denser as it collapses?
- Ahmed Samra
- · Replies 1 ·
Graduate Thought experiment involving spacetime curvature:
- VeryConfusedP
- · Replies 4 ·
Undergrad Distance change due to gravity
- nurica
- · Replies 24 ·
Graduate Recovering Forces from Christoffel Symbols: A Derivation
- pervect
- · Replies 0 ·
Graduate Extending the Lorentz force equation to accommodate SR
- MarkovMarakov
- · Replies 11 ·
Undergrad The atomic clock on a jetliner experiment
- jaydnul
- · Replies 4 ·
Graduate A series of questions regarding Gravity:
- VeryConfusedP
- · Replies 17 ·