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 How Large Must a Spark Chamber Be to Qualify as an Inertial Frame?
- Ed Quanta
- · Replies 1 ·
Graduate How do I find the line element on a torus?
- robousy
- · Replies 2 ·
Graduate Calculating Christoffel symbols for a spherical shell in 2-space
- TheMan112
- · Replies 10 ·
Graduate Is Synchronizing Clocks at Different Positions Neglecting Light Travel Delays?
- ehj
- · Replies 7 ·
Graduate Black holes and the time issue
- Tachyonie
- · Replies 2 ·
Graduate Educational value of spacetime diagrams
- Dale
- · Replies 16 ·
High School How can anything travel faster than light?
- _Mayday_
- · Replies 65 ·
Graduate Special Relativity, 2nd postulate, and a dilemma
- W.RonG
- · Replies 6 ·
Graduate From Lorentz transformatios to Bondi's approach
- bernhard.rothenstein
- · Replies 7 ·
Graduate Is the Universe a Singular Entity with Time as an Illusion?
- getodechoppa
- · Replies 1 ·
Graduate How Does Kaluza-Klein Theory Separate Classical and Quantum Equations of Motion?
- MikeL#
- · Replies 13 ·
High School Why does light always travel at the same speed relative to me?
- osiris774
- · Replies 8 ·
Graduate What happens when you tug on a chain stretching to the moon?
- OSalcido
- · Replies 4 ·
Graduate The light clock and time dilation.
- ehj
- · Replies 3 ·
Graduate Deriving/Justifying Lorentz Interval
- tomprice
- · Replies 15 ·
Graduate Spacetime transformations or not?
- matheinste
- · Replies 9 ·
Graduate What Is the Triplet Paradox and Its Implications for Time Dilation?
- keithh
- · Replies 6 ·
Graduate Why is the Torsion Tensor Overlooked in General Relativity?
- bchui
- · Replies 2 ·
Graduate Tachyons travel backward in time?
- CJames
- · Replies 71 ·
Graduate Is the Contravariant Derivative Defined by Contracting with the Metric?
- Pacopag
- · Replies 3 ·
Graduate Twin Paradox: Why Does the Traveling Twin Age Slower?
- Fubini
- · Replies 19 ·
Graduate Can Lorentz Transform Hold in a Discrete Space-Time Model?
- mhill
- · Replies 2 ·
Graduate Einstein's Thought-Experiment: Disgruntled Observer's Perspective
- ch@rlatan
- · Replies 3 ·
Graduate Do special and general relativistic effects combine near a black hole event horizon?
- keithh
- · Replies 10 ·
Graduate Proof of invariance of gas pressure
- yuiop
- · Replies 44 ·
Graduate Use of Special or General Relativity in QM?
- hagopbul
- · Replies 8 ·
Graduate What happens to time when gravity is absent
- quantify
- · Replies 11 ·
Graduate What Happens in a Relativistic Particle Collision?
- itsjustme
- · Replies 4 ·
Graduate On Pressure/Gravity/The Expanding Universe
- Riogho
- · Replies 16 ·
Graduate Why haven't we observed distortion of objects near a black hole's event horizon?
- Benzoate
- · Replies 3 ·
Graduate Are Black Holes Made of Waveforms?
- keithh
- · Replies 4 ·
Graduate How Are Gravitational Waves Derived from Einstein's Field Equations?
- Dale
- · Replies 2 ·
Graduate What is speed relative to when determining time dilation?
- W3pcq
- · Replies 15 ·
Graduate What are the implications of rotational reference frames?
- CaptainQuasar
- · Replies 3 ·
Graduate X' relative to S' and relative to S
- arbol
- · Replies 6 ·
Graduate Wavelength in a Circular Orbit Around Earth
- greeniguana00
- · Replies 2 ·
Graduate Why did Einstein choose the form R_ab - 1/2 g_ab R for the field equations?
- Phymath
- · Replies 2 ·
Undergrad Can you actually measure an object's velocity?
- Brainv2.1beta
- · Replies 14 ·
Graduate Why does the curl tensor formula ∂aVb - ∂bVa give zero in 3D?
- snowstorm69
- · Replies 12 ·
Graduate Is Time Bending the 3rd Dimension in Spacetime Curvature?
- overcaffein8d
- · Replies 3 ·
Graduate Do wormholes really exist in spacetime?
- Aftermarth
- · Replies 5 ·
Graduate Einstein's ultimate conclusion regarding ether and Relativity?
- W.RonG
- · Replies 1 ·
Graduate Books and papers on electromagnetism in curved spacetime
- Phymath
- · Replies 3 ·
Graduate How does a photon's event horizon look like?
- EnumaElish
- · Replies 6 ·
Graduate Can Atomic Clocks Accurately Measure Time in Accelerating Bodies?
- mrzero
- · Replies 2 ·
Undergrad No seriously; Can we, maybe, go to the past?
- Spirit
- · Replies 4 ·
Graduate Is Modern Physics Still Shaped by The Dancing Wu Li Masters?
- John Richard
- · Replies 4 ·
Graduate Why are time and space inseparable?
- ytilaerlaernu
- · Replies 23 ·
Graduate Is spacetime four-dimensional or is that just a model of causality?
- Fubini
- · Replies 2 ·
Graduate Why nothing is observed going back in time
- A.T.
- · Replies 16 ·
Graduate Changing the speed of light does nothing?
- TheDonk
- · Replies 22 ·
Graduate Cosmological constant as a perfect fluid
- EDerkatch
- · Replies 2 ·
Undergrad Plot a point on Earth through the Universe
- Magic Man
- · Replies 6 ·
Graduate Differences between Lorentz scalars and Lorentz invariants
- Llewlyn
- · Replies 3 ·
Graduate Does light direction change due to relativistic aberration?
- W.RonG
- · Replies 12 ·
Undergrad What is the effect of relativity on measurements in a moving universe?
- kalle437
- · Replies 8 ·
Graduate Relativity Concerning Small Particles
- Supercritical
- · Replies 2 ·
Graduate How does photon gain its speed in no time?
- mdeng
- · Replies 16 ·
Graduate Why does light have an invariant speed?
- mdeng
- · Replies 117 ·
Graduate Q about relativistic mass increase, starship
- ContactLight
- · Replies 1 ·
Graduate Could general relativity be right simply because it explains gravity?
- mdeng
- · Replies 16 ·
Graduate Why do tachyons seemingly travel backward in time?
- Magic Man
- · Replies 21 ·
Graduate Why did Einstein postulate the theory of the speed of light in an at-rest frame?
- ch@rlatan
- · Replies 17 ·
Graduate Why does the metric tensor have opposite signs for time and space?
- nolanp2
- · Replies 4 ·
Graduate How Does Relativity Affect Our Perception of Light and Photons?
- poeteye
- · Replies 32 ·
Graduate Blueshift + Classical Physics = Golden Ratio
- greeniguana00
- · Replies 3 ·
Graduate Can Relativity Account for the Age Difference in a Big Circle?
- jdavel
- · Replies 7 ·
Undergrad Does gravity apply at very short distances?
- Ulysees
- · Replies 3 ·
Download Einstein's Essays from Annals of Physics
- myquelahira
- · Replies 1 ·
Graduate What Are the Hamilton-Jacobi Equations for General Relativity?
- nughret
- · Replies 1 ·
Graduate Is the quoted explanation of special relativity accurate?
- Coolphreak
- · Replies 2 ·
Graduate Problem with equivalence principle.
- yuiop
- · Replies 7 ·
Graduate Could time be movement in a 4th physical dimension?
- Meatbot
- · Replies 2 ·
Graduate Observed Time vs Observed Duration
- gonegahgah
- · Replies 7 ·
Undergrad Time Dilation and space missions
- W3pcq
- · Replies 33 ·
Graduate Time slows down when you approach the speed of light?
- catia
- · Replies 80 ·
Undergrad What are preferred coordinates?
- Shaun Culver
- · Replies 9 ·
Graduate Proof of Lorentz Geom. Not Holding in All Acc. Frames - Example
- Phymath
- · Replies 3 ·
Undergrad Is it not possible to travel in light speed?
- Seek45
- · Replies 5 ·
Graduate Portal Discussion: Human at Speed of Light
- jannin
- · Replies 2 ·
Graduate Why do identical accelerations create distance in the co-accelerating ships paradox?
- AnssiH
- · Replies 44 ·
High School Maximum Non-Relativistic Speed
- touqra
- · Replies 5 ·
Graduate How Does Change Relate to the Relativity of Time and Entropy?
- Hernik
- · Replies 18 ·
Graduate Time dilation paradox with three relativistic reference frames
- John Richard
- · Replies 5 ·
Graduate Einstein began looking for gravity in the electromagnetic waves
- asymmetric
- · Replies 3 ·
Graduate Is the Schwarzschild radius always constant in black holes?
- random3f
- · Replies 8 ·
Graduate Relativity and my Intergalactic Space Race
- StrangeChicke
- · Replies 4 ·
Graduate How Do Different Velocities Affect Clocks in Special Relativity?
- Achillez
- · Replies 10 ·
Graduate Light vs Non-EM Wave Velocity and Time Dilation
- sheetalbhat
- · Replies 10 ·
Graduate Simulation: ray of light near black hole
- halfelven
- · Replies 4 ·
Graduate Where can I find translated versions of the original General Relativity papers?
- Denton
- · Replies 7 ·
Graduate Why does the travelling twin age less if both see each other moving?
- fred2028
- · Replies 25 ·
Undergrad The twins paradox and explanation
- Stellar1
- · Replies 22 ·
Graduate What is the Equation Relating Tardyon Components in Different Reference Frames?
- bernhard.rothenstein
- · Replies 12 ·
Graduate Phase invariance of e.m. waves
- bernhard.rothenstein
- · Replies 8 ·
Graduate Does Time Dilation Occur with Uniform Motion?
- fred2028
- · Replies 4 ·
Graduate Why does light slow down when falling into a black hole?
- ohadohad2
- · Replies 14 ·
Undergrad What is the relative velocity of two observers with given object velocities?
- dragan
- · Replies 51 ·
Graduate Postulate and special relativity
- bernhard.rothenstein
- · Replies 26 ·
Graduate Why Is the Riemann Tensor Contracted in the Einstein Field Equations?
- captain
- · Replies 1 ·