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
High School Light-clock proper time in constant acceleration
- jartsa
- · Replies 27 ·
Undergrad Hyperbolic Geom of Minkowski Space: Chung et al. 2009
- nomadreid
- · Replies 6 ·
Graduate How Does Visser Derive Schwarzschild Geometry from Minkowski Space?
- Demystifier
- · Replies 22 ·
Undergrad Transformations of Electromagnetic Fields: Griffiths' Claims
- sophiatev
- · Replies 3 ·
High School Do you hit the ring singularity falling into a rotating black hole?
- MikeeMiracle
- · Replies 18 ·
High School Why is "time orthogonal to space" in inertial reference frames?
- Shirish
- · Replies 69 ·
Graduate Solving Jackson's 3rd Ed. Equations Involving A, L and g
- anbhadane
- · Replies 8 ·
High School Can Universe Be Decelerating in Time?
- VarnaiKristof
- · Replies 4 ·
Graduate Curvature Tensor for Dual Vectors
- Phinrich
- · Replies 26 ·
High School Do black holes spaghettify or compress falling objects?
- Jiyong Chung
- · Replies 13 ·
Undergrad Lorentz transformation of the "bilinear spinor matrixelement"
- Garlic
- · Replies 7 ·
Graduate Constant Scalings of 4-Vectors" - Zweibach, 2nd Ed.
- AhmadKhaqan
- · Replies 6 ·
High School Deriving Lorentz Transformations with 3 Postulates
- Shirish
- · Replies 20 ·
High School How do platform and train observers measure simultaneity differently?
- Shirish
- · Replies 13 ·
Undergrad Choice of signature important for superluminal 4-velocity? (Minkowski)
- PhDeezNutz
- · Replies 61 ·
Graduate Understanding Killing Vector Equation Notation
- John Greger
- · Replies 6 ·
Undergrad Null Spacetime Intervals and Quantum Superposition
- XilOnGlennSt
- · Replies 16 ·
Insights Is Pressure A Source Of Gravity?
- PeterDonis
- · Replies 27 ·
Undergrad What to study after learning Schwarzschild spacetime?
- kent davidge
- · Replies 14 ·
Undergrad Gravitational time dilation using an accelerating light-clock
- jcap
- · Replies 15 ·
Undergrad Which statement about light-cones and vector types is false
- Arman777
- · Replies 8 ·
Undergrad Why does higher kinetic energy increase the energy-momentum 4-vector's time component?
- MattGeo
- · Replies 21 ·
Graduate Can R. Mallett's Device Overcome Energy Challenges for Time Travel?
- Marilyn67
- · Replies 5 ·
High School How Many Reference Frames Can Be Coincident at the Origin?
- Lynch101
- · Replies 24 ·
Graduate Understanding how to derive the stress-energy tensor formula
- JD_PM
- · Replies 9 ·
Undergrad Maximum detectable torque from spinning cylinders in gravitomagnetic experiment
- olgerm
- · Replies 21 ·
High School The Missing Mass of a reaction
- etotheipi
- · Replies 1 ·
High School Does relativity necessitate the block universe view of time?
- Lynch101
- · Replies 90 ·
Undergrad Mass distribution behavior of the singularities during black hole mergers
- DarkMattrHole
- · Replies 37 ·
Undergrad Spacetime globe tool for visualizing Lorentz transforms
- Nick-stg
- · Replies 13 ·
High School Time dilation formula for different spacetime paths
- etotheipi
- · Replies 20 ·
Undergrad Why Can't Objects Travel Faster Than Light?
- Jiyong Chung
- · Replies 18 ·
Undergrad How to Incorporate Metric Coefficients into Worldline Plots in Curved Spacetime?
- exmarine
- · Replies 7 ·
Undergrad What Are the Physical Properties of Human-Sized Worm Holes?
- Unbreakabletoon
- · Replies 5 ·
Undergrad Relation between proper acceleration and four-acceleration
- Arman777
- · Replies 23 ·
High School Gisin's ideas on time vs. special relativity—how does one reconcile them?
- Freixas
- · Replies 36 ·
Undergrad Relative Velocity of Particle ##p##: S vs S
- Apashanka
- · Replies 1 ·
Undergrad Lorentz boost -- speed or velocity?
- nomadreid
- · Replies 36 ·
Undergrad Do velocities add simply in expanding spacetime?
- gerald V
- · Replies 13 ·
Undergrad Electromagnetic field according to relativity
- fog37
- · Replies 51 ·
High School Is E=mc² the Formula for the Speed of Light?
- TaurusSteve
- · Replies 17 ·
Undergrad Does direct interparticle action imply advanced inertial forces?
- jcap
- · Replies 1 ·
High School Is there a thought experiment to show that the speed of light is constant?
- somega
- · Replies 17 ·
High School Does accelerating space expansion mean time accelerates too?
- HEXiT
- · Replies 9 ·
High School Time Travel Equation for Case B
- Shubh Goel
- · Replies 15 ·
High School Does time depend on speed and distance between bodies?
- Shubh Goel
- · Replies 2 ·
Undergrad Proper time calculation for different frames in a spacetime diagram
- Arman777
- · Replies 20 ·
Undergrad Find Einstein's Field Equation - Intuition with Strong Equivalence Principle
- hugo_faurand
- · Replies 13 ·
Undergrad Can touch be relative if everything is relative?
- Johnny5454
- · Replies 2 ·
Graduate Understand Linear Perturbations to Stationary Black Holes
- Replusz
- · Replies 8 ·
Undergrad Does gravity warp how we perceive the length of objects?
- Uchida
- · Replies 7 ·
Undergrad Mathematical Truth of Physically Observable Quantities
- Replusz
- · Replies 13 ·
Undergrad Proof that two timelike vectors cannot be orthogonal
- Arman777
- · Replies 9 ·
Undergrad Why is four-velocity the tangent vector to the worldline?
- Arman777
- · Replies 17 ·
Undergrad What is an affine space and how does it differ from ordinary space?
- Arman777
- · Replies 13 ·
High School Spacetime diagram: why does the t-axis appear shorter than t'?
- jaumzaum
- · Replies 13 ·
High School Interpreting Lorentz Transformation Rotations
- David Lewis
- · Replies 4 ·
Undergrad Trying To Calculate Christoffel Symbols
- cgreeleybsu
- · Replies 16 ·
Undergrad Find Experimental Results for Physics Project
- cgreeleybsu
- · Replies 2 ·
High School Does spacetime curvature propagate instantly or with a delay?
- TheoEndre
- · Replies 14 ·
Undergrad The magnitude of a four velocity
- Arman777
- · Replies 12 ·
Graduate What is the significance of the TL interval square measurement in relativity?
- LCSphysicist
- · Replies 11 ·
High School 2 objects at 0.6c in opposite directions. Can outrun light?
- DirkMan
- · Replies 11 ·
Insights Slowly Lowering an Object in a Static, Spherically Symmetric Spacetime
- PeterDonis
- · Replies 0 ·
High School Particle with negative mass inside a black hole horizon
- timmdeeg
- · Replies 25 ·
Graduate Metric Form of ##g_{μν}## - Solving a Challenge
- hykhor0601
- · Replies 13 ·
Undergrad Are Basics of Cosmology Difficult to Grasp?
- kent davidge
- · Replies 5 ·
Graduate Stats on Students Understanding Theory of Relativity
- PainterGuy
- · Replies 4 ·
High School Can analog computers work 300 times faster at relativistic speeds?
- danielhaish
- · Replies 15 ·
Undergrad Does Earth bobbing from gravitational waves have multiple ripples?
- bland
- · Replies 7 ·
High School Length Contraction Thought Experiment: Spot Mistake/Wrong Assumption
- galm_2727
- · Replies 4 ·
High School Does matter lower dark energy pressure locally?
- Dennis Plews
- · Replies 5 ·
Undergrad What does E(nergy) = m(ass) (times c^2) mean?
- sayetsu
- · Replies 3 ·
Undergrad Naming convention for regions in spacetime diagrams
- Robert Friz
- · Replies 8 ·
Undergrad What are trapped and anti-trapped surfaces in Penrose's singularity theorem?
- windy miller
- · Replies 3 ·
Graduate Lorentz transformation and translation symmetry problem
- HaoBoJiang
- · Replies 4 ·
Undergrad Four-Vector in Spacetime: Invariance Across All Reference Frames?
- sophiatev
- · Replies 7 ·
Undergrad Using AI for Gravitational Wave Generation
- kelly0303
- · Replies 3 ·
Undergrad Frame Dragging Around Spinning Black Holes: Implications
- Robert Friz
- · Replies 7 ·
Undergrad Is the Sagnac Effect a Relativistic Phenomenon?
- Hepper
- · Replies 5 ·
Graduate Transformation law of the energy momentum tensor
- filip97
- · Replies 9 ·
High School Measurement of an unknown velocity vector of a closed space
- WalT888
- · Replies 1 ·
High School Is the current definition of gravity accurate?
- Antony Death
- · Replies 14 ·
Undergrad Who Will Win the Race at the Event Horizon?
- arkantos
- · Replies 12 ·
Undergrad An event being in the past of a timelike separated one
- sophiatev
- · Replies 20 ·
High School Where does the energy go as the universe expands?
- sqljunkey
- · Replies 21 ·
Undergrad Why is rdΦ the correct arc length in polar coordinates, not (r+dr)dΦ?
- sophiatev
- · Replies 11 ·
High School Accurate measurement of the speed of light
- TonyYuan
- · Replies 10 ·
High School Who will win this running race?
- TonyYuan
- · Replies 29 ·
High School What is the speed of a photon traveling along the sine function?
- somega
- · Replies 13 ·
Undergrad Exact historical explanation of deducing speed of light constancy
- roineust
- · Replies 48 ·
High School A thought Experiment in Time Dilation
- just dave
- · Replies 31 ·
High School Mass, Energy, and Space-Time: How Do They Interact?
- sqljunkey
- · Replies 8 ·
High School Relativistic time dilation with three clocks in nested reference frames
- danielhaish
- · Replies 4 ·
Undergrad Relativistic Work-Energy Theorem: Deriving Griffiths' Formula
- ArtVandolay
- · Replies 2 ·
Undergrad How Do You Derive the Distance Formula for a Hyperbola?
- Adwit
- · Replies 29 ·
Undergrad Gravitational time dilatation and curved spacetime - follow up
- cianfa72
- · Replies 58 ·
Undergrad Why does a vector change direction under parallel transport on a sphere?
- RohanJ
- · Replies 9 ·
Undergrad Why do clocks show proper time?
- George Keeling
- · Replies 27 ·
Undergrad Can We Confine Energy to Create Microscopic Black Holes?
- Frank Schroer
- · Replies 2 ·