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 Doppler effect and speed of light as a constant.
- paalfis
- · Replies 1 ·
Graduate Why does faster-than-light travel imply backwards time travel?
- serinorah
- · Replies 10 ·
Graduate What does "invariance of proper time" mean?
- SreenathSkr
- · Replies 45 ·
Graduate A question of "Time" and pre-determination and has everything already happened?
- Thormier
- · Replies 5 ·
Graduate Can clock transport tell us anything important
- dbkooper
- · Replies 48 ·
Graduate Does gravitational and velocity time dilation add together?
- mcjosep
- · Replies 8 ·
Graduate Big Bang: A True Singularity That is Coordinate Independent
- victorvmotti
- · Replies 1 ·
Graduate How can we combine metrics in a spacetime with multiple point masses?
- dman12
- · Replies 8 ·
Graduate Time dilations on confusing situations
- Solvay
- · Replies 9 ·
Graduate Is Space-Time Dilation Just a Funny Concept or Does It Have Real Properties?
- Adrian2000
- · Replies 57 ·
High School Why would Earth move in straight line without sun's gravity?
- avito009
- · Replies 3 ·
Graduate Detecting Gravity Waves: An Exploration of Using Them for Communication
- hddd123456789
- · Replies 2 ·
Graduate Gauss - Bonnet Gravity -> Curvature variations
- Breo
- · Replies 35 ·
Graduate The modelling of space time through Riemann tensor calculus
- aditya ver.2.0
- · Replies 3 ·
Graduate Does Length Contraction Imply Superluminal Speeds?
- Fantasist
- · Replies 19 ·
Graduate Was Einstein lucky when not considering twin paradox as paradox?
- adoion
- · Replies 151 ·
Graduate Why does the Einstein-Rosen metric have power 4 in ds² but power 2 in g₁₁?
- Breo
- · Replies 1 ·
Graduate What Causes the Unexpected Limit in Rindler Horizon Calculations?
- Mentz114
- · Replies 21 ·
Graduate Difficulty in understanding the notation
- PhyAmateur
- · Replies 3 ·
Graduate Why Does General Relativity Use Coordinate Systems?
- zeromodz
- · Replies 2 ·
Graduate Why does light reflection depend on frame in length contracted systems?
- Ookke
- · Replies 11 ·
Graduate How do the Natario and Alcubierre warp drives differ?
- JonnyMaddox
- · Replies 2 ·
Undergrad Length contracting between objects
- member 529879
- · Replies 8 ·
Undergrad Time dilation -- light clock on a train thought experiment
- DAC
- · Replies 9 ·
Graduate Quantum Tunneling: Can Photons Escape Black Holes?
- Tom Phillippe
- · Replies 3 ·
Graduate Disk rotating in a gravitational field, like a clock
- Karl Coryat
- · Replies 13 ·
Graduate Can Going the Speed of Light Create Waste in a Vacuum?
- DaveDem
- · Replies 11 ·
Undergrad Why Can't Objects Accelerate to Light Speed?
- trigonatus
- · Replies 5 ·
Graduate What Happens to a Baseball Thrown from a Light Speed Ship?
- parkland
- · Replies 6 ·
Graduate Why is spacetime one and is time really a dimension?
- rajeshmarndi
- · Replies 19 ·
Graduate What is the Significance of 4-Velocity in Special Relativity?
- DiracPool
- · Replies 1 ·
Undergrad Why does light redshift if its speed is always constant?
- TerryHM
- · Replies 3 ·
Graduate Light Speed Photon: Everywhere at Once?
- Tom Phillippe
- · Replies 1 ·
Graduate Big Bang: Spacetime Created in 1 Sec
- TerryHM
- · Replies 1 ·
Undergrad Understanding Einstein's Theory of Relativity: Laser Technique Questions
- Manfredthethird
- · Replies 7 ·
Graduate Distinguishing Special Relativity from Classical Mechanics
- Strilanc
- · Replies 13 ·
Graduate An atomic clock and a normal clock
- Galileo Galilei
- · Replies 9 ·
Graduate Problem with a piece of calculation
- ShayanJ
- · Replies 4 ·
Graduate Mass Inflation in BH: A Depreciated Concept?
- tzimie
- · Replies 1 ·
Graduate Does light speed up when gravitationally lensed by the Sun?
- rmoh13
- · Replies 7 ·
Graduate Does the upper index denote rows in Λμν matrix notation?
- grzz
- · Replies 5 ·
Graduate Why is gravity so weak compared to other forces?
- Eric Hentschel
- · Replies 15 ·
Graduate Is time real or a mathematical construct?
- trevor white
- · Replies 6 ·
Graduate Length contraction of particles
- member 529879
- · Replies 2 ·
High School Can a gravitational field pull in one direction instead of toward a center?
- Dimwitted
- · Replies 2 ·
High School Can Meeting Your Future Self Create a Time Loop?
- AdityaDev
- · Replies 6 ·
Graduate Free fall into BH and horizons
- tzimie
- · Replies 20 ·
Graduate Evidence for Variable Speed of Gravity in Coordinate Spacetime
- Thinkor
- · Replies 6 ·
Graduate What Are the Dimensions of Energy and Matter in Physics?
- Eric Hentschel
- · Replies 1 ·
Graduate Can g_00 of the metric tensor depend on time
- birulami
- · Replies 14 ·
Graduate Do observers at different velocities measure different photons from the sun?
- jbmolineux
- · Replies 9 ·
Graduate How did researchers arrive at 10 times light speed for warp drives?
- ANarwhal
- · Replies 55 ·
Graduate Gravitational red- or rather blue-shift when approaching Schwarzschild radius
- birulami
- · Replies 4 ·
Graduate Where should I ask about mathematical problems with Riemann curvature tensor
- aditya ver.2.0
- · Replies 5 ·
Graduate Can a photon truly slow down in a dense medium?
- sunrah
- · Replies 12 ·
Graduate Non-Dimensional Accretion Rate λ: Overview and Questions
- Vrbic
- · Replies 7 ·
Graduate Black Hole/Entanglement Question
- Gaz1982
- · Replies 18 ·
Graduate Slow Motion Observed in SR Spaceships?
- alackofcolor
- · Replies 7 ·
Graduate Invariance of the speed of light
- DAC
- · Replies 18 ·
Graduate 4-velocity of an observed object in GRT
- birulami
- · Replies 2 ·
Graduate Can light experience Gravity assist?
- sciencegem
- · Replies 8 ·
Graduate Physical interpretation of the stress energy momentum tensor
- space-time
- · Replies 4 ·
Graduate Could the Twin Paradox in GR be Generalized to Completely Empty Space?
- dman12
- · Replies 21 ·
Graduate Acceleration-free twin paradox
- jethomas3182
- · Replies 35 ·
Graduate Does gravity have a similar effect on energy as it does with time?
- mcjosep
- · Replies 7 ·
Graduate Time dilation through velocity of a moving body
- aditya ver.2.0
- · Replies 2 ·
Graduate Geodesic quation coordinate time
- Svendsen
- · Replies 3 ·
Graduate By what method did Einstein derived his gravitational field equation?
- DOTDO
- · Replies 8 ·
Undergrad Can Numerical Simulations Accurately Predict Orbital Precession?
- oq123
- · Replies 5 ·
Graduate Can a black hole slow down time and create a time difference between observers?
- IgorM101
- · Replies 2 ·
Graduate Acceleration and the twin paradox
- DiracPool
- · Replies 172 ·
Undergrad Twin paradox with one twin shot upward and falling back
- virgil elings
- · Replies 18 ·
Graduate LIGO & GRB 070201 - Ruling Out a Neutron Star Merger
- ShayanJ
- · Replies 2 ·
Graduate Does gravity cause length contraction like velocity does?
- Akshar Tandon
- · Replies 2 ·
Graduate Why is proper time the natural choice for defining velocity and acceleration?
- zwoodrow
- · Replies 1 ·
Undergrad Gravitational Time and Length Change, Looking for mass formula
- mcjosep
- · Replies 5 ·
Graduate Why does a stationary object fall toward a center of mass?
- Christine88
- · Replies 95 ·
Graduate Time Dilation Notation in SR: Clarifying the Differential Form
- connorp
- · Replies 2 ·
Graduate What Role Do Particles Play in Understanding Planck Scales in Quantum Gravity?
- victorvmotti
- · Replies 2 ·
Graduate What is the real impact of speed on time in the theory of time dilation?
- Redneck-65
- · Replies 31 ·
Graduate Does Relativity Support the Masslessness of Photons?
- jerromyjon
- · Replies 3 ·
Graduate Can Jensen Receive Same-Time Signals from Sensors?
- Hernik
- · Replies 3 ·
Graduate Help Make Math Connect in General Relativity
- space-time
- · Replies 1 ·
Graduate Length Contraction of Electrons
- member 529879
- · Replies 6 ·
High School Why does time slow down and the train compress in relativity?
- DaCouchPutater
- · Replies 6 ·
Graduate How are contravariant and covariant vectors defined differently in SR and GR?
- nigelscott
- · Replies 2 ·
Graduate Raychoudhuri's Equation in Abstract Notation
- center o bass
- · Replies 1 ·
Undergrad Special Relativity Time Dilation Santa question
- applestrudle
- · Replies 4 ·
Graduate General solution to the wave equation of electromagnetic field
- victorvmotti
- · Replies 3 ·
Graduate Observing black holes inside black holes
- l0st
- · Replies 19 ·
Graduate Crossing the Event Horizon: Observing a Massive Black Hole
- JollyOlly
- · Replies 6 ·
Graduate Why does mass affect space time?
- thetexan
- · Replies 2 ·
Graduate Does an electron emit radiation when falling towards Earth?
- CKH
- · Replies 3 ·
Undergrad Do atomic clocks measure time dilation or just measure their own slowing?
- Graham2
- · Replies 4 ·
Graduate E=mc^2 Proof: Is it OK? - Adam Aulton
- Redstart
- · Replies 1 ·
Graduate Does linear momentum transfer when a particle collides with a black hole?
- apamirRogue
- · Replies 1 ·
Graduate Which Local Coordinates Are Best Suited for Different Problems and Applications?
- m4r35n357
- · Replies 4 ·
Graduate Einstein's Theory of Relativity
- AJ Allen
- · Replies 13 ·
Graduate Find Null Paths in Differentiable Manifolds Using One-Forms
- victorvmotti
- · Replies 1 ·
Graduate Doppler Effect and Conservation of Energy
- bgq
- · Replies 26 ·