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 Could a slower-than-light version of the Alcubierre drive work?
- MonkeyKid
- · Replies 8 ·
Graduate Gauss-Codacci equation space-like foliation
- WannabeNewton
- · Replies 7 ·
Graduate Magnetic field moving faster than speed of light?
- djsourabh
- · Replies 1 ·
Graduate Understanding Rest Mass and Its Relation to Velocity in Special Relativity
- sydneybself
- · Replies 9 ·
Graduate Does general relativity have a concept of inhomogeneous timefields?
- johann1301
- · Replies 1 ·
Graduate The physics meaning of the light cones tipping over
- extrads
- · Replies 13 ·
Graduate Why Can't Flat Spacetime Connection Be Used in GR Covariant Derivative?
- dEdt
- · Replies 23 ·
Graduate How Does the Ricci Tensor Affect Tensor Equations in Wald's Problem?
- tommyj
- · Replies 4 ·
Graduate Where can I find theses on the Gödel metric in English or Spanish?
- ferst
- · Replies 2 ·
Graduate Relativity Of Simultaneity Problem
- Trojan666ru
- · Replies 10 ·
Graduate Attempting to learn tensor calculus
- pierce15
- · Replies 12 ·
Graduate Is Clock Synchronization Throughout a Time-Like Congruence Transitive?
- WannabeNewton
- · Replies 4 ·
Graduate Incorporation of special relativity into general relativity
- nigelscott
- · Replies 27 ·
Graduate Curvature of Spacetime and its Impact on the Speed of Light
- Arjun Kumar
- · Replies 12 ·
Graduate Special relativity, light direction and wave source.
- Banana Joe
- · Replies 40 ·
Graduate Does Time Slow Down for Objects Falling into a Black Hole at the Event Horizon?
- dyb
- · Replies 11 ·
Graduate Negative potential energy versus negative field energy in gravity
- Herbascious J
- · Replies 13 ·
Graduate Most proper time in Schwarzchild metric
- stallm
- · Replies 10 ·
Undergrad What Happens to Mass as it Approaches the Speed of Light?
- teetar
- · Replies 9 ·
Graduate Is there a known parametrization for time dilation in the FLRW metric?
- Vincentius
- · Replies 36 ·
Graduate Twin paradox without acceleration - A different question
- rede96
- · Replies 14 ·
Graduate Understanding Euclidean Group E(n) Elements
- ChrisVer
- · Replies 4 ·
Graduate Sign conventions in general relativity
- Nabigh R
- · Replies 7 ·
Graduate Is length contraction relative to the object's rest frame or our frame?
- analyst5
- · Replies 52 ·
Graduate About the Starship Titanic and joules/accelerations.
- blakean87
- · Replies 7 ·
Undergrad Gravitational pull on an object
- revo74
- · Replies 1 ·
Graduate Tensors in GR and in mechanics
- TrickyDicky
- · Replies 38 ·
Graduate Orbit eq. holds inside BH? - MTW sec. 25
- Jorrie
- · Replies 6 ·
Graduate Why does gravity cause acceleration in modern physics?
- Brady Campbell
- · Replies 6 ·
Graduate Space-Time Warpage and Kinetic Energy
- sgolson
- · Replies 8 ·
Graduate Mass is not the cause of gravity?
- Brady Campbell
- · Replies 3 ·
Graduate Twin paradox: does the stationary twin's worldline shift during acceleration?
- analyst5
- · Replies 32 ·
Graduate How Does Relativistic Velocity Affect the Heat Capacity of an Ideal Gas?
- Sunfire
- · Replies 10 ·
Graduate Relativity and particle collision.
- Herbascious J
- · Replies 7 ·
Graduate If all space-time already 'exists' then
- DarkMatterHol
- · Replies 12 ·
Graduate Do contravariant vectors correspond to polar vectors?
- kderakhshani
- · Replies 7 ·
Graduate Cosmological redshift as kinematical Doppler effect
- tom.stoer
- · Replies 13 ·
Undergrad Mass-Energy Conservation: E/m=c^2
- john951007
- · Replies 4 ·
Graduate What does curvature of spacetime in general relativity actually mean?
- rushikesh
- · Replies 24 ·
Undergrad Why no electric field from a current in a wire? Length contraction.
- maajdl
- · Replies 11 ·
Graduate Why the Michelson-Morley experiment shows no fringe shift
- Paul77
- · Replies 3 ·
Graduate Twin paradox without accelerative frame.
- Trojan666ru
- · Replies 118 ·
Graduate Does Relativistic Motion Affect Time Perception on Moving Trains and Platforms?
- JVNY
- · Replies 31 ·
Graduate Tensor Densities: Coordinate Independent Definition
- dEdt
- · Replies 3 ·
Graduate What Would Happen w/ Infinite Light Box?
- MichaelJ
- · Replies 19 ·
Graduate Why don't black holes look like neutron stars to outside observer?
- apocope
- · Replies 4 ·
Graduate Killing vectors and complex equations
- TimeFall
- · Replies 3 ·
Graduate Do the distance between two objects contract in length contraction
- Trojan666ru
- · Replies 13 ·
Graduate Stress-energy tensor for a single photon
- salvador_dali
- · Replies 5 ·
Graduate On the nature of the infinite fall toward the EH
- rjbeery
- · Replies 546 ·
Undergrad Can a smaller object have the same relativistic mass as a larger one if it moves faster?
- Antigone
- · Replies 16 ·
High School Gravity Analogy: Why Does Moon Orbit Earth?
- oneamp
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Graduate Can atoms and electrons move faster than light speed?
- daDragon
- · Replies 18 ·
Graduate Can Warp Speed Violate Causality? The Debate Among Physicists
- Dhruva Patil
- · Replies 6 ·
Graduate Realistic black hole in Friedmann universe
- tom.stoer
- · Replies 18 ·
Graduate Why does vector addition satisfy the Leibniz rule in tangent spaces?
- dEdt
- · Replies 2 ·
Undergrad Why no Doppler shift in Einstein's train lightning thought experiment
- Incognito310
- · Replies 20 ·
Graduate Confusion about special relativity
- MostlyHarmless
- · Replies 13 ·
Undergrad A couple basic spacetime questions.
- Mhorton91
- · Replies 5 ·
Graduate Implications of constant speed of light in all inertial frames
- Commando Spaz
- · Replies 12 ·
Graduate General Relativity: Contracting Indices
- direct99
- · Replies 5 ·
Graduate How can black holes form if infalling matter never crosses the horizon?
- yprager
- · Replies 6 ·
Undergrad What space contracts in Special Relativity?
- dubiousraves
- · Replies 62 ·
Graduate Finding inverse metric tensor when there are off-diagonal terms
- Nabigh R
- · Replies 4 ·
Graduate Difference between tensor rank and type
- ddesai
- · Replies 4 ·
Graduate Spacetime 'loaf' according to Fabric of the Cosmos
- Dannen
- · Replies 3 ·
Graduate Solving Confusion about Hans Ohanian's One-Dimensional Gas Example
- bcrowell
- · Replies 0 ·
Graduate JollyOlly's book 'A Roller Coaster Ride through Relativity'
- ghwellsjr
- · Replies 28 ·
Graduate What conserved quantity corresponds to a null Killing vector?
- pervect
- · Replies 3 ·
Graduate Tensors and General Relativity
- pierce15
- · Replies 6 ·
Graduate Where does Dirac's variation formula δp^μ = (p^ν b^μ - p^μ b^ν),_ν come from?
- dEdt
- · Replies 3 ·
Graduate Transformation to local inertial frame
- Libra82
- · Replies 13 ·
Graduate Time Dilation: Current vs Massless Universe
- CzarBrent
- · Replies 1 ·
Undergrad To Saturn at (nearly) the speed of light
- Baggins101
- · Replies 64 ·
Graduate Point particle in scalar potential
- jostpuur
- · Replies 12 ·
Graduate Relative velocity between Lemaître and dropped observer using rapidity
- Jorrie
- · Replies 15 ·
Graduate Why does light not reach any distance instantly?
- chillpenguin
- · Replies 41 ·
Graduate Full Lagrangian for Electrodynamics: Find ##\mathcal{L}_\textrm{matter}##
- dEdt
- · Replies 2 ·
Graduate Open-Source Book on Special Relativity - Free Download
- bcrowell
- · Replies 2 ·
Graduate How Does 4-Acceleration Differ in General Relativity Versus Special Relativity?
- TrickyDicky
- · Replies 4 ·
Undergrad The universal gravitational constant (G)
- Yoni
- · Replies 2 ·
Graduate Stability of Closed Time-Like Curves: Current Status?
- ksy
- · Replies 4 ·
Graduate Why Can't We Apply Euler-Lagrange Directly to the Electromagnetic Lagrangian?
- dEdt
- · Replies 14 ·
Graduate Lagrangian density for continuous distribution of matter
- dEdt
- · Replies 10 ·
Graduate Is Weyl Curvature Present in Interior Spacetimes?
- Markus Hanke
- · Replies 4 ·
Graduate Does Time Dilation Occur for Both Twins in the Twin Paradox?
- stevmg
- · Replies 10 ·
Graduate Does the speed of light change with the age of the universe?
- vinven7
- · Replies 28 ·
Graduate Generel Relativity Force or Affect in Space Time
- Quarlep
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Graduate Why a constant determinant of the metric?
- Rob Sfic
- · Replies 17 ·
Graduate Does a GPS satellite clock tick faster or slower than Earth clocks?
- stevmg
- · Replies 2 ·
Graduate Can spacetime curve with zero energy density in FRW cosmology?
- copernicus1
- · Replies 5 ·
Graduate Conservations law or equations of motion, and other constrains
- sergiokapone
- · Replies 21 ·
Graduate Symmetrical motion and resolving differences in FoR
- coktail
- · Replies 34 ·
Graduate Differences in Presentation of Ordinary Partial Derivatives of Tensors
- mokrunka
- · Replies 3 ·
Graduate Maxwell's equations from divergence of stress-energy tensor?
- bcrowell
- · Replies 5 ·
Graduate What is the Lorentz invariance of flux in the stress-energy tensor?
- dEdt
- · Replies 10 ·
Graduate Is length contraction real or just a matter of perspective?
- JVNY
- · Replies 73 ·
Graduate Why does v = 0 in the Lorentz Transformation equation?
- xwolfhunter
- · Replies 3 ·
Graduate Metric in SR: \eta^{\alpha \beta}=\eta_{\alpha \beta}?
- dEdt
- · Replies 3 ·
Undergrad Can relativistic mechanics explain the concept of force?
- Quarlep
- · Replies 19 ·