Special and General Relativity Forum

Post thread
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.
Undergrad Can the Spacetime Interval at a Singularity Change Our Understanding of Time?
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad Correcting General Relativity Effect on Atomic Time
  • · Replies 12 ·
Replies
12
Views
2K
Undergrad Is Heart Rate Invariant in Different States of Motion?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Space - time and the illusion of time
  • · Replies 14 ·
Replies
14
Views
2K
Undergrad Cross Product in E_u: Explaining Gourgoulhon's Text
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Doppler effect - can't imagine how the frequency of light can change
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad General Relativity: Angular Momentum, Gravity & Questions
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Speed of light not an invariant in GR
  • · Replies 105 ·
4
Replies
105
Views
9K
Undergrad What do physicists mean by "local degrees of freedom"?
  • · Replies 11 ·
Replies
11
Views
4K
Undergrad General relativity, Electromagnetism and Feynman Diagrams
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Does rotation in Gödel spacetime depend on the frame of reference?
  • · Replies 31 ·
2
Replies
31
Views
4K
Undergrad Coincidence of FLWR & CBR Homogeneity: Earth @ 0.0013c?
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Is acceleration absolute or relative - revisited
  • · Replies 185 ·
7
Replies
185
Views
11K
Undergrad Why was Schrodinger's equation for the relativistic wave unsuccessful?
  • · Replies 1 ·
Replies
1
Views
775
Undergrad Does string theory falsify the theory of special relativity?
  • · Replies 19 ·
Replies
19
Views
3K
Undergrad Crossing Event Horizon: Physics of Disintegration?
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad Speed of Light in Different Mediums: Exploring Maxwell Equations
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Derivation of E=pc & E=MC2: Which Came First?
  • · Replies 67 ·
3
Replies
67
Views
8K
Undergrad Calculating Distance Light Travels Near a Black Hole
  • · Replies 12 ·
Replies
12
Views
2K
Undergrad Understanding Relativity: How Moving Objects Experience Near Light Speed Travel
  • · Replies 83 ·
3
Replies
83
Views
6K
Undergrad Decompose SL(2C) Matrix: Real Parameters from Complex
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Explore Coordinate Dependent Statements in Orodruin's Insight
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad Equations of Spacetime Invariant - Understanding the Difference
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Gravitational Waves Emitted by a Binary System
  • · Replies 24 ·
Replies
24
Views
2K
Undergrad Solving GR 2-Body Problem with Summ. of Christoffel Symbols
  • · Replies 12 ·
Replies
12
Views
2K
Undergrad Would circumnavigating the Universe allow one way measurement of light's speed?
  • · Replies 69 ·
3
Replies
69
Views
5K
Undergrad How Do Dual Vectors Differ From Regular Vectors in Physics?
  • · Replies 35 ·
2
Replies
35
Views
7K
Undergrad Klein-Gordon: Schwarzschild Metric, Physically Acceptable?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Is the premise of the Michelson–Morley argument still valid?
  • · Replies 31 ·
2
Replies
31
Views
4K
Undergrad Interpretation of Potential Energy as Field Property
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Compute EOM for Spin Connection from Einstein-Palatini Action
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Calculating Time Dilation & Galaxy Rotation Curve
  • · Replies 7 ·
Replies
7
Views
3K
Undergrad Solving the Flickering Light Paradox
  • · Replies 20 ·
Replies
20
Views
3K
Undergrad Compute Gradient in GR: Step-by-Step Guide
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Source of Gravity of heavy mass as per GTR
  • · Replies 14 ·
Replies
14
Views
2K
Undergrad Gravity on Earth: Basic Qs Answered by Physicists
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad Movement of a guitar string at relativistic speeds
  • · Replies 61 ·
3
Replies
61
Views
6K
Undergrad Can Time Travel Into the Future Really Happen?
  • · Replies 19 ·
Replies
19
Views
3K
Undergrad 4 spaceships are pulling a membrane through an asteroid belt
  • · Replies 8 ·
Replies
8
Views
1K
Undergrad What is the four-momentum of a photon?
  • · Replies 17 ·
Replies
17
Views
4K
Undergrad GTR & STR: Could 9 Dimensions Unify Theory?
  • · Replies 6 ·
Replies
6
Views
1K
Undergrad Cosmic Censorship: Does it Hold?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad What is the Role of Matter in General Relativity's Lagrangian?
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad Relativistic Velocity, Perp. Accel., Momentum: Explained
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Gravity: Compounded Space (Time) Signal?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Disappearing Sun: A Thought Experiment on the Effects of Gravity and Light
  • · Replies 20 ·
Replies
20
Views
2K
Undergrad Conservation of energy in general relativity
  • · Replies 42 ·
2
Replies
42
Views
7K
Undergrad Recovering Newton's energy conservation law for an Earth's lab
  • · Replies 35 ·
2
Replies
35
Views
3K
Undergrad Is coordinate speed affected by gravitational waves?
  • · Replies 17 ·
Replies
17
Views
3K
Undergrad Hawking Radiation: Info vs Semanticity? - Hossenfelder
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Spacetime invariance algebraic proof
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad The Sub Photon Sphere Escape Game
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad Unravelling the Mysteries of the Kerr Black Hole Ergosphere
  • · Replies 19 ·
Replies
19
Views
2K
Undergrad Radius Excess of Curvature in Relativity: Explained
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Investigating The Photon Sphere
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Solving Relativistic Inelastic Collisions: 150 GeV Energy
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad Solving the Spherically Symmetric Einstein Equation
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Observing Black Holes in Finite Time
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad Self-Study General Relativity: After Multivariate Calc in HS
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Speed of Sound & Light: Is it True?
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Is Teleportation & Time Travel Possible?
  • · Replies 17 ·
Replies
17
Views
2K
Undergrad What software can I use to make space-time diagrams?
  • · Replies 5 ·
Replies
5
Views
5K
Undergrad Riemann Curvature Tensor on 2D Sphere: Surprising Results
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Does time dilation cause different aging rates for people?
  • · Replies 27 ·
Replies
27
Views
4K
Undergrad Precession of Mercury: Adaptation for Observers
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad How to communicate between planets?
  • · Replies 26 ·
Replies
26
Views
2K
Undergrad Thought Exp: Gen Relativity & Time Dilation
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Velocity Addition and Doppler Effect: Explained
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Are Derivatives of the Metric Different in Flat Spacetime?
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Magnetic Field Generated By Moving Charged Objects - Confusion Explained
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Dissolving Event Horizon w/Charged & Rotating BH
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Const Curvature Scalar & 3-Torus: Is It Maximally Symmetric?
  • · Replies 12 ·
Replies
12
Views
3K
Undergrad Explore Alternative Interpretations of Special Relativity
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad Einstein Field Eqns: East/West Coast Metrics
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad Understanding Feynman's Relativistic Electric Field Equation
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad Explaining the Twin Paradox: A Big Problem?
  • · Replies 33 ·
2
Replies
33
Views
3K
Undergrad Is it feasible to measure one way speed of light this way?
  • · Replies 52 ·
2
Replies
52
Views
6K
Undergrad How to Change Between Unit Systems w/ ##c \ne 1, \hbar \ne 1, G \ne 1##
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Momentum Conservation in Special Relativity: mwu
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Inverting the metric coefficients in the Schwarzschild line element
  • · Replies 32 ·
2
Replies
32
Views
4K
Undergrad Proper time to reach the singularity of a Schwarschild black hole
  • · Replies 4 ·
Replies
4
Views
8K
Undergrad Time Dilation & Superluminal Travel: 2 Questions
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad Why does an object initially at rest begin to fall?
  • · Replies 24 ·
Replies
24
Views
4K
Undergrad Does Light Curve Spacetime?
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad Interpreting Schwarzschild Metric: Photon Falls Toward Black Hole
  • · Replies 18 ·
Replies
18
Views
2K
Undergrad Charged Particle Free Fall in Grav Field: Does Anyone Know Answer?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Video camera in a moving rocket
  • · Replies 6 ·
Replies
6
Views
1K
Undergrad Gravitons Replacing General Relativity: Can it Work?
  • · Replies 18 ·
Replies
18
Views
3K
Undergrad Is it possible to extend Newtonian gravity to include energy as well as mass?
  • · Replies 24 ·
Replies
24
Views
2K
Undergrad Temporal Gradients at Event Horizons of Black Holes
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Electrodynamics of Dielectrics: 4D to 3D
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad The Speed of Light: Can it Travel in Opposite Directions?
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad EM Field Strength in Curved Spacetime: Is it Unchanged?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad The center of mass & relativistic collisions
  • · Replies 7 ·
Replies
7
Views
3K
Undergrad Q re de Sitter–Schwarzschild metric
  • · Replies 35 ·
2
Replies
35
Views
4K
Undergrad How Does Relativity of Simultaneity Clash w/Thermodynamics?
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad Special Relativity: Intuition & Quantities Explained
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad Check for geodesically-followed path in a coordinate-free way
  • · Replies 95 ·
4
Replies
95
Views
7K
Undergrad Logic question on relativity- no math
  • · Replies 26 ·
Replies
26
Views
2K
Undergrad Riemann Tensor, Stoke's Theorem & Winding Number
  • · Replies 5 ·
Replies
5
Views
2K