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 Do charged particles radiate when freely falling in a gravitational field?
- lerus
- · Replies 7 ·
High School Why and how does the frequency of a moving clock affect its ticking speed?
- John Mcrain
- · Replies 69 ·
Graduate Find 2D Geometry of Line Element in Coordinates
- steve1763
- · Replies 14 ·
High School Where Does Momentum Go Near Merging Black Holes?
- Filmo
- · Replies 5 ·
Insights Does the Block Universe of Physics Mean Time is an Illusion?
- RUTA
- · Replies 56 ·
Graduate Spinor fields on curved spacetime using SL(2,C) covering group
- schieghoven
- · Replies 15 ·
High School Lagrangian Point in General Relativity
- D.S.Beyer
- · Replies 52 ·
High School Does 'looking out the window' mean direction in relativity postulates?
- roineust
- · Replies 14 ·
High School Shape of Hubble sphere at relativistic velocity
- Chris Miller
- · Replies 54 ·
High School Feynman's index notation in Vol II Chapter 25
- etotheipi
- · Replies 12 ·
High School Are time and light at the same speed?
- adafus
- · Replies 36 ·
Undergrad Video camera in a moving rocket
- Libor
- · Replies 6 ·
Graduate Does the block universe imply a mathematical structure and multiverse?
- Physicuser
- · Replies 6 ·
Undergrad How can massless particles be affected by gravity if gravitons only act on mass?
- 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 Does light from a perpendicular flashlight angle with spacecraft motion?
- 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 Are black holes and white holes the same solution in Schwarzschild metric?
- 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 Why do Bob and Ted measure different ages for stationary Alice?
- 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 does light take 8 minutes to reach Earth if light speed is constant?
- r731
- · Replies 18 ·
Undergrad Is the center of mass frame useful in 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 Speed and measurements in a relativistic trip to Alfa Centauri
- 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 Does the Riemann tensor become multivalued with winding number?
- jk22
- · Replies 5 ·
High School Gravitational waves, Earth's shape, and the strong equivalence principle
- roineust
- · Replies 3 ·
Undergrad Finite Lorentz Transformation via Poisson Bracket
- andresB
- · Replies 3 ·
Undergrad How do force equations change in special relativity if they can't be instantaneous?
- Fascheue
- · Replies 7 ·
Graduate Axisymmetric vs Spherical Metric Comparison
- lmmoreira
- · Replies 16 ·
High School How does traveling at near c affect particle horizon and conformal time?
- Chris Miller
- · Replies 2 ·
Undergrad Gravity transition directly at the underside of a "shell planet"
- mgkii
- · Replies 2 ·
Undergrad Minkowski spacetime deformation near a black hole
- 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 Why does Shankar say x' = ct' in the Lorentz transformation?
- abrogard
- · Replies 16 ·
Undergrad What initiates gravitational movement?
- nytmr24
- · Replies 29 ·
Undergrad Deriving Mercury's perihelion precession from the Schwarzschild solution
- 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 How to derive length contraction from the postulates of special relativity
- UuserForMe
- · Replies 5 ·
High School Frame Dragging Rate: Mass Proportionality?
- e2m2a
- · Replies 1 ·
Graduate Why are vectors the primary linear maps to real numbers in dual spaces?
- 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 Do electrons jump around from our perspective and ours from theirs?
- Boltzman Oscillation
- · Replies 10 ·
High School Coordinate basis vectors and position vector notation
- 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 Rest mass or total energy in Schwarzschild radius calculations?
- dsaun777
- · Replies 15 ·
Graduate Gauge Transformations: Understanding Lorentz Condition
- PreposterousUniverse
- · Replies 1 ·
Undergrad Why does proving a relation in flat coordinates prove it in any coordinate system?
- 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 Raising indices in a vanishing tensor equation preserves the equation
- George Keeling
- · Replies 3 ·
Undergrad Contracting indices with the metric tensor
- 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 Can non-gravitational forces warp spacetime like gravity does?
- szopaw
- · Replies 15 ·
Graduate Gauge Invariance of Transverse Traceless Perturbation in Linearized Gravity
- PreposterousUniverse
- · Replies 2 ·
High School Does light from a moving source appear to travel faster than c?
- danielhaish
- · Replies 20 ·
Undergrad Why does geometric treatment of gravity require the equivalence principle?
- checksix
- · Replies 2 ·
High School Demonstrating Time and Distance Effects of a Martian Signal
- Speady
- · Replies 28 ·
High School Do gravitational waves affect accelerated weighing scales like stationary ones?
- 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 Can gravitational waves influence gravity?
- roineust
- · Replies 15 ·