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
Undergrad Video camera in a moving rocket
- Libor
- · Replies 6 ·
Graduate Block Universe Theory: Implications & Multiverse
- Physicuser
- · Replies 6 ·
Undergrad Gravitons Replacing General Relativity: Can it Work?
- SamRoss
- · Replies 18 ·
High School Do we feel the Earth going around the Sun as acceleration?
- danielhaish
- · Replies 10 ·
Graduate Determining Geometry of Line Element: A General Method?
- steve1763
- · Replies 5 ·
High School Light Behaviour at High Speed: Explained
- Daveopg
- · Replies 2 ·
High School Paradox about black hole evaporation
- Kostik
- · Replies 35 ·
Undergrad Is it possible to extend Newtonian gravity to include energy as well as mass?
- trees and plants
- · Replies 24 ·
Graduate Black Holes & White Holes: Same or Different?
- Gaussian97
- · Replies 20 ·
Undergrad Temporal Gradients at Event Horizons of Black Holes
- Kostik
- · Replies 4 ·
Undergrad Electrodynamics of Dielectrics: 4D to 3D
- AndrejR
- · Replies 1 ·
High School Bob & Ted See Different Ages for Alice on Earth
- RandyD123
- · Replies 5 ·
Undergrad The Speed of Light: Can it Travel in Opposite Directions?
- swampwiz
- · Replies 1 ·
Undergrad EM Field Strength in Curved Spacetime: Is it Unchanged?
- DuckAmuck
- · Replies 7 ·
High School Why is the speed of light constant?
- r731
- · Replies 18 ·
Undergrad The center of mass & relativistic collisions
- Adams2020
- · Replies 7 ·
Undergrad Q re de Sitter–Schwarzschild metric
- Buzz Bloom
- · Replies 35 ·
Undergrad How Does Relativity of Simultaneity Clash w/Thermodynamics?
- Amaterasu21
- · Replies 9 ·
Undergrad Special Relativity: Intuition & Quantities Explained
- rakso
- · Replies 13 ·
Undergrad Check for geodesically-followed path in a coordinate-free way
- cianfa72
- · Replies 95 ·
Undergrad Logic question on relativity- no math
- ThisTimeTomorrow
- · Replies 26 ·
Undergrad Riemann Tensor, Stoke's Theorem & Winding Number
- jk22
- · Replies 5 ·
High School Understanding Strong Equivalence Principle Errors & Misunderstandings
- roineust
- · Replies 3 ·
Undergrad Finite Lorentz Transformation via Poisson Bracket
- andresB
- · Replies 3 ·
Undergrad Special Relativity & Non-Instantaneous Force Equations
- Fascheue
- · Replies 7 ·
Graduate Axisymmetric vs Spherical Metric Comparison
- lmmoreira
- · Replies 16 ·
High School Particle Horizon & Coformal Time Near c - Observer Effects
- Chris Miller
- · Replies 2 ·
Undergrad Gravity transition directly at the underside of a "shell planet"
- mgkii
- · Replies 2 ·
Undergrad Another spacetime visualization
- Tomas Vencl
- · Replies 23 ·
Undergrad Variation of Ricci scalar wrt derivative of metric
- jcap
- · Replies 3 ·
Undergrad Acceleration in Special Relativity
- Fascheue
- · Replies 26 ·
High School Twin paradox explained for laymen
- Tony Wright
- · Replies 254 ·
High School Black hole horizon and Hawking evaporation
- Marilyn67
- · Replies 30 ·
Graduate Parallel plate capacitor in the Rindler metric
- pervect
- · Replies 26 ·
Undergrad Can Newtonian Gravity be Thought of as a Theory of Curved Time?
- Grasshopper
- · Replies 20 ·
Undergrad Geodesics using 2 Variables: Time & Radius from Mass
- kairama15
- · Replies 1 ·
Undergrad Speed of light for a Rindler observer
- Gaussian97
- · Replies 57 ·
High School Special Cases of Stress-Energy Tensor in GR
- ohwilleke
- · Replies 10 ·
Undergrad Do you accelerate through time when you stand still on Earth?
- Grasshopper
- · Replies 30 ·
High School Shankar on Lorentz Transformation: Does x' = ct'?
- abrogard
- · Replies 16 ·
Undergrad What initiates gravitational movement?
- nytmr24
- · Replies 29 ·
Undergrad Mercury Perihelion Precession: Analytic Derivation
- cianfa72
- · Replies 20 ·
Undergrad Deriving vacuum FRW equations directly from action
- jcap
- · Replies 1 ·
Graduate GR: Is Schwarzschild Spacetime Time-Independent?
- jk22
- · Replies 3 ·
Undergrad Would light keep on a straight path after it bends?
- danielhaish
- · Replies 16 ·
High School Kugelblitz at the speed of light misconception
- Andrea Panza
- · Replies 10 ·
Undergrad General Generator of Lorentz Transformation in Hamiltonian Formalism
- andresB
- · Replies 4 ·
Undergrad Gravitational waves as not "proximal"?
- ComradeConrad
- · Replies 28 ·
High School On time dilation and length contraction
- trees and plants
- · Replies 34 ·
Graduate Energy condition respecting warp drives in Einstein Cartan theory
- Quantum23
- · Replies 9 ·
Undergrad Rotation or acceleration defined without relation to something else
- cianfa72
- · Replies 24 ·
Undergrad Length Contraction & Time Dilation: Proving It
- UuserForMe
- · Replies 5 ·
High School Frame Dragging Rate: Mass Proportionality?
- e2m2a
- · Replies 1 ·
Graduate Explore Carroll's Theory on Dual Space and Real Numbers
- dontknow
- · Replies 17 ·
High School Near the speed of light time slows down but not at everyday speeds?
- Nick tringali
- · Replies 8 ·
Undergrad Connection coefficient transformation law
- Pencilvester
- · Replies 13 ·
Graduate Alternative theories to General Relativity
- trees and plants
- · Replies 15 ·
Undergrad Space Travel: Possibilities & Questions
- Arcticstar
- · Replies 2 ·
Graduate Is time real (in a physical sense)?
- dendros
- · Replies 3 ·
High School Is the gamma-factor for Tachyons real?
- Sagittarius A-Star
- · Replies 13 ·
Undergrad The Energy - Momentum Equation vs the Energy - Mass Equation
- htam9876
- · Replies 131 ·
Undergrad Special Relativity and Velocity
- thequantumcat
- · Replies 29 ·
Undergrad Particle Perspective: How Relativity Affects Us
- Boltzman Oscillation
- · Replies 10 ·
High School Just a question about the tangent basis
- etotheipi
- · Replies 6 ·
Graduate Do state variables in general relativity have analogies in electromagnetism?
- cuallito
- · Replies 1 ·
Undergrad Supernova 100,000 Light Years Away: Agree on Time?
- Vampyr
- · Replies 4 ·
Undergrad The Schwarzschild Radius: Mass vs. Energy
- dsaun777
- · Replies 15 ·
Graduate Gauge Transformations: Understanding Lorentz Condition
- PreposterousUniverse
- · Replies 1 ·
Undergrad What is a Covariant Relation? GR Problem Solution Explained
- Haorong Wu
- · Replies 17 ·
Undergrad How to Write T_{\mu v} for Energy-Momentum Tensor
- Diracobama2181
- · Replies 2 ·
Undergrad Gravitational Waves: Hardest GR Topic?
- kent davidge
- · Replies 1 ·
Undergrad What happens when twins synchronize clocks and one teleports?
- Pyter
- · Replies 9 ·
Undergrad Variation of Metric and the Energy-Momentum Tensor: Where Am I Going Wrong?
- Gaussian97
- · Replies 1 ·
Undergrad Solving Vanishing Tensor Eqn & Raising All Indices
- George Keeling
- · Replies 3 ·
Undergrad Beginner question about tensor index manipulation
- Data Base Erased
- · Replies 8 ·
Undergrad Convert 2x2 Matrix to 1x1 Tensor
- Vitani1
- · Replies 13 ·
Undergrad Definition of Second-Order Tensor by Jim Adrian
- jamesadrian
- · Replies 38 ·
Undergrad Why Does Special Relativity Not Contradict General Philosophy?
- fxdung
- · Replies 1 ·
Undergrad Black Hole Bomb Effectiveness: Mirrors or Wormholes?
- Vanilla Gorilla
- · Replies 9 ·
High School Unifying Non-Gravity Forces & Spacetime Warping
- szopaw
- · Replies 15 ·
Graduate Gauge Invariance of Transverse Traceless Perturbation in Linearized Gravity
- PreposterousUniverse
- · Replies 2 ·
High School Light's Speed & Moving Observer: What Happens?
- danielhaish
- · Replies 20 ·
Undergrad Equivalence Principle & Geometry: Ben Crowell's General Relativity
- checksix
- · Replies 2 ·
High School Demonstrating Time and Distance Effects of a Martian Signal
- Speady
- · Replies 28 ·
High School Sum up Questions for Gravitational Waves & Weighing Scales
- roineust
- · Replies 5 ·
Undergrad Which clock was slower in special relativity?
- entropy1
- · Replies 49 ·
Undergrad Is the choice of metric signature truly just a convention in physics?
- jean140
- · Replies 14 ·
High School LIGO Arm Length & Sensitivity: What's the Relation?
- roineust
- · Replies 3 ·
High School Gravitational Waves: Impact & Effects on Gravity
- roineust
- · Replies 15 ·
Undergrad Irreducible Representations of EM-Tensor Under Spatial Rotations
- PreposterousUniverse
- · Replies 1 ·
Insights Intro to Centrifugal Force Reversal in Kerr Spacetime
- PeterDonis
- · Replies 0 ·
Undergrad Muon Time Dilation in Accelerating Frames
- bksree
- · Replies 2 ·
Graduate Spaghettification: Geometrical & Mathematical Description
- zvwner
- · Replies 4 ·
Undergrad Momentary Co-Moving Reference Frame in SR
- Vitani1
- · Replies 3 ·
High School Einstein's Train: Light Travel Time Explained
- David Lewis
- · Replies 4 ·
Undergrad Energy in the Schwarzschild spacetime
- pervect
- · Replies 30 ·
Graduate Understanding Differential Forms: Torsion, Spin & Tetrad
- gnnmartin
- · Replies 10 ·
Undergrad Does Spacelike Worldlines Exist?
- kent davidge
- · Replies 3 ·
High School Fundamentals of Lightspeed: Questions & Answers
- Inertia_Squared
- · Replies 6 ·
High School The speed of light: Was Einstein's second postulate not so revolutionary?
- UuserForMe
- · Replies 25 ·