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 Why Does Covariant Index Represent Partial Derivative in Special Relativity?
  • · Replies 22 ·
Replies
22
Views
2K
Undergrad Conserved Quantity Along Affine Parameter
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad Light Clock Relativity: Why Divide T_moving/T_stationary?
  • · Replies 15 ·
Replies
15
Views
2K
Undergrad Question about Stress-Energy Tensor: A First Course in GR
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad Uniform gravitational field possible in GR?
  • · Replies 22 ·
Replies
22
Views
3K
Undergrad Why do we still say “the speed of light” instead of “c”?
  • · Replies 12 ·
Replies
12
Views
2K
Undergrad Definition of "Physical Frame": All You Need To Know
  • · Replies 23 ·
Replies
23
Views
3K
Undergrad Is the concept of a one-way speed of light meaningful and measurable?
  • · Replies 25 ·
Replies
25
Views
5K
Undergrad Speed of Light: Spaceship & Gravity Law Impact
  • · Replies 15 ·
Replies
15
Views
2K
Undergrad Why is Number-Flux Four-Vector Frame-Independent?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Velocity addition via k-calculus
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad The Length of World Line: Prerequisite for Proper Time
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Why Is Minkowski Spacetime Non-Euclidean?
  • · Replies 63 ·
3
Replies
63
Views
8K
Undergrad Weak principle of equivalence (Galileo, Newton)
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad The Theoretical Minimum: Length Contraction and Time Dilation
  • · Replies 17 ·
Replies
17
Views
3K
Undergrad Searching for "Why Is Minkowski Spacetime Non-Euclidean" by Cronkhite
  • · Replies 14 ·
Replies
14
Views
2K
Undergrad Constraints on Lorentz Velocity Transformation
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Does Space Curvature Account for Gravity Between Individual Atoms?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Can Maxwell's Equations Explain Gravitation Through Retarded Wave Solutions?
  • · Replies 12 ·
Replies
12
Views
2K
Undergrad Co-Moving Coordinates & Lapse Function N(t) in ADM Decomposition
  • · Replies 8 ·
Replies
8
Views
3K
Undergrad Will a spherical mass be set in motion by a spherical shell rotating around it?
  • · Replies 36 ·
2
Replies
36
Views
3K
Undergrad Applying Velocity Addition in Rotating Frame: Is It Correct?
  • · Replies 18 ·
Replies
18
Views
2K
Undergrad Shape Dynamics: How Can It Offer Same Predictions as GR & SR?
  • · Replies 14 ·
Replies
14
Views
2K
Undergrad Questions concerning the geometry of spacetime
  • · Replies 111 ·
4
Replies
111
Views
6K
Undergrad Relativistic Velocity Addition: Calculating Electron Speed
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Does the Light's One/Two-Way Speed Distinction Mean Anything?
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad Calculate Eigenvalues of Electromagnetic & Stress-Energy Tensors
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Why am I getting the wrong conclusion from my spacetime diagram?
  • · Replies 24 ·
Replies
24
Views
2K
Undergrad Instrument Size & Wavelength: What's the Relationship?
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad Raising & Lowering Indices: Q&A on Relativity
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Potential Energy in Wormholes: Charged Particles & Electric Fields
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Is the Killer Crate Paradox Resolved?
  • · Replies 60 ·
3
Replies
60
Views
6K
Undergrad Doppler Analysis of Twin Experiment: Valid Argument?
  • · Replies 37 ·
2
Replies
37
Views
3K
Undergrad How Can Outward Normal Vector Point Inwards?
  • · Replies 17 ·
Replies
17
Views
3K
Undergrad Einstein Definition of Simultaneity for Langevin Observers
  • · Replies 11 ·
Replies
11
Views
3K
Undergrad Infinite Frequencies & Extraterrestrial Signals: What Are We Missing?
  • · Replies 18 ·
Replies
18
Views
2K
Undergrad The Units of the Cosmological Constant: eV^2
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Simulating GR: Worth the Effort?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Fermi-Walker Transport: History & 1932 Paper
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Kronecker Delta: Order of Indices Explained
  • · Replies 5 ·
Replies
5
Views
4K
Undergrad Is Time Dilation Just a Misunderstanding of Clock Errors?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Energy Density in E Field: Does it Contribute to Inertial Mass?
  • · Replies 16 ·
Replies
16
Views
3K
Undergrad Physical meaning of a spacelike geodesic
  • · Replies 62 ·
3
Replies
62
Views
5K
Undergrad Radiate Single Charged Particle: Free Fall in Black Hole?
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Distance Contraction: Is D or D*sqrt(1-(v/c)^2) Traveled?
  • · Replies 27 ·
Replies
27
Views
2K
Undergrad Gravitoelectromagnetism: Why Equation Differs in Sources
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Effects of Supermassive Black Hole Merger on Nearby Bodies
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Is Acceleration an Invariant? (Taylor & Wheeler)
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Cat Chasing Red Dot Faster Than c: Results & Analysis
  • · Replies 13 ·
Replies
13
Views
3K
Undergrad Difference between proper time and coordinate time
  • · Replies 36 ·
2
Replies
36
Views
7K
Undergrad Length contraction in General Relativity
  • · Replies 64 ·
3
Replies
64
Views
7K
Undergrad Spacetime Curvature via Triangle
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Defining the components of a metric
  • · Replies 24 ·
Replies
24
Views
4K
Undergrad Wilbert Zweistein's Objection to Equivalence Principle
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad Index Gymnastics: Tensor Product of 4-Vectors & Tensors
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Can a Basis Vector be Lightlike?
  • · Replies 28 ·
Replies
28
Views
3K
Undergrad Can time run backwards in an accelerating frame?
  • · Replies 125 ·
5
Replies
125
Views
8K
Undergrad Differences b/w Schwarzschild Radius & Event Horizon
  • · Replies 11 ·
Replies
11
Views
3K
Undergrad Schwarzschild Metric & Particle Absorption
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad Rindler Wedge: Timelike or Spacelike? Intuition & Light Cone
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Energy conditions and non-physical phenomena
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad Is a Flat, Expanding Universe Compatible with GR and Newtonian Mechanics?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad GR: Practical Problem Sets w/ Solutions
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Is there really nothing faster than light?
  • · Replies 40 ·
2
Replies
40
Views
5K
Undergrad Black Hole: Knock on the horizon
  • · Replies 34 ·
2
Replies
34
Views
3K
Undergrad What is the Meaning of Lagrangian in Special Relativity?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Applying Reisenbach Transf. to EM Wave in Microwave Oven
  • · Replies 16 ·
Replies
16
Views
2K
Undergrad How to Measure Speed of Light & Is It Constant?
  • · Replies 13 ·
Replies
13
Views
3K
Undergrad Gravitomagnetic Experiment: Possibility & Calculations
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad Time Travel in Newtonian Spacetime: Is it Possible?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Comparing Clock Rates in Accelerated vs Constant Velocity Frames
  • · Replies 14 ·
Replies
14
Views
2K
Undergrad Ideal Fluids & General Relativity: Why Needed?
  • · Replies 15 ·
Replies
15
Views
2K
Undergrad How Does Time Dilation Affect the Twin Paradox in Special Relativity?
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad Constant Velocity Motion in Relativity: Radiation Effects?
  • · Replies 23 ·
Replies
23
Views
2K
Undergrad Isotropy of the speed of light
  • · Replies 264 ·
9
Replies
264
Views
17K
Undergrad General Relativity: Is it Local?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Deriving Special Relativity from Particle Indistinguishability
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Gravitational vs. Electromagnetic Waves: What's the Difference?
  • · Replies 20 ·
Replies
20
Views
3K
Undergrad Proof of Special Relativity w/ Michelson–Morley Experiment
  • · Replies 20 ·
Replies
20
Views
3K
Undergrad Light speed independent of source
  • · Replies 22 ·
Replies
22
Views
2K
Undergrad Understand Poynting Density of Flow of Energy w/Weak Physics Background
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad Relative Motion vs. 'Relative' Acceleration: Twin 1 & 2
  • · Replies 16 ·
Replies
16
Views
2K
Undergrad Reichenbach Synchronisation: Proving i=r
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad A paradox for two moving protons?
  • · Replies 30 ·
2
Replies
30
Views
3K
Undergrad About global inertial frames in GR
  • · Replies 78 ·
3
Replies
78
Views
8K
Undergrad Gravity on the Moon vs. on the spinning Earth
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad Why does a body at rest move if Gravity is not a force?
  • · Replies 70 ·
3
Replies
70
Views
6K
Undergrad Relativity paradox: rocket landing in a cylinder
  • · Replies 50 ·
2
Replies
50
Views
4K
Undergrad Deriving Lorentz Transformations: Hyperbolic Functions
  • · Replies 33 ·
2
Replies
33
Views
3K
Undergrad Discussing General Relativity - Beliefs & Ideas
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Understanding Lorentz Factor & Proper Time Invariance
  • · Replies 32 ·
2
Replies
32
Views
4K
Undergrad Computing Volume in General Relativity: Use of Tensor & Friedmann Eqns
  • · Replies 8 ·
Replies
8
Views
3K
Undergrad Understanding Gravity with GR: Beginner's Guide by Aerodyn
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad Does Lorentz invariance imply Einstein's synchronization convention?
  • · Replies 32 ·
2
Replies
32
Views
4K
Undergrad Can Gravity Escape a Black Hole?
  • · Replies 21 ·
Replies
21
Views
3K
Undergrad Proper Time & 4-vectors: Clarification Needed
  • · Replies 20 ·
Replies
20
Views
3K
Undergrad Is a Manifold with a Boundary Considered a True Manifold?
  • · Replies 202 ·
7
Replies
202
Views
12K
Undergrad Curved space and gravitational waves
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Klein Gordon Invariance in General Relativity
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad Definition of "Spatial X Direction" in Spacetime Context
  • · Replies 39 ·
2
Replies
39
Views
3K