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 Energy-momentum formula and deBroglie wavelength
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Measuring Speed of Light Relative to Earth
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad Center of Mass Motion: Velocity & Momentum
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Flash open manhole cover paradox
  • · Replies 28 ·
Replies
28
Views
4K
Undergrad If a rock fell 20,000 meters to Earth Question
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Why Is a Violation of Causality a Problem?
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad Confirming Covariant Derivative in Hartle's Gravity
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad Separating Overlapping Event Horizons: Theory
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Length Contraction & Mass Increase in GR | General Relativity
  • · Replies 14 ·
Replies
14
Views
2K
Undergrad Can a Geometric Animation Help Visualize the Special Theory of Relativity?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad 4-momentum of a massless particle
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad How to fill the stress energy tensor for multi body systems
  • · Replies 29 ·
Replies
29
Views
3K
Undergrad Proving Effects of Stress-Energy Tensor on Curvature
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Can Spacetime Be Visualized in a 2D Universe Like Flatland?
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad Alcubierre Drive & Bending of Spacetime
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Derivative of Lorentz factor and four-acceleration
  • · Replies 14 ·
Replies
14
Views
6K
Undergrad Negative Mass and Hawking Radiation
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad Understanding Time Dilation and Velocity: Debunking Common Misconceptions
  • · Replies 30 ·
2
Replies
30
Views
3K
Undergrad Can Wormholes Be Stabilized Using Negative Energy Density?
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Twin Paradox & Bondi K-Calculus: Who's Younger?
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad Measuring Light Speed Anisotropy
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad Does a metric exist for this surface?
  • · Replies 14 ·
Replies
14
Views
2K
Undergrad Why isn't the Roemer type experiment a one way measure of c?
  • · Replies 56 ·
2
Replies
56
Views
6K
Undergrad Gravitational Waves vs Universe Expansion Rate
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Confusion about Frame Dragging
  • · Replies 34 ·
2
Replies
34
Views
4K
Undergrad Einstein's Elevator & Tidal Gravity
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Einstein's Pursuit of Unified Theory: Motivation and Observations
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Alice Observes Bob at Event Horizon: DarkLink's Question
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad Explaining Relativity within 3 minutes
  • · Replies 14 ·
Replies
14
Views
2K
Undergrad Why Does ds^2 Equal 0 in Metrics?
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad Does the "space twin" benefit from length contraction?
  • · Replies 136 ·
5
Replies
136
Views
12K
Undergrad Embedding Curved Spacetime in Noncurved Spacetime
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad What is the true nature of distance in the context of space and time?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Velocity Relativity: Solving a Complex Problem
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Measuring Speed in Relativity - Einstein's Work Explained
  • · Replies 17 ·
Replies
17
Views
2K
Undergrad Atomic Oscillations & Redshift in Sun and Earth
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad General Relativity & Quantum Theory: Where's the Limit?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Requesting clarification about metric tensor
  • · Replies 33 ·
2
Replies
33
Views
4K
Undergrad Proof that Galilean & Lorentz Ts form a group
  • · Replies 18 ·
Replies
18
Views
5K
Undergrad Coordinate singularity at Schwarzschild radius
  • · Replies 57 ·
2
Replies
57
Views
8K
Undergrad Can Black Holes Create a Path for Lovers to Meet?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Testing GR to What Energy Level?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Weak Gravitational Field: Solving Einstein Field Eqs
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Can General Relativity Accommodate Spaces Without Killing Vectors?
  • · Replies 6 ·
Replies
6
Views
1K
Undergrad Special Relativity: Kinetic Energy Expansion and Contradictions
  • · Replies 14 ·
Replies
14
Views
1K
Undergrad Velocity addition and conservation of the energy
  • · Replies 21 ·
Replies
21
Views
2K
Undergrad Speed of Light & Magnetic Field: Condensing Wave Speed?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Why the speed of light is constant for every observer?
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad Getting Invariant Curvature from Momentum & Energy
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad Line Element in Minkowski Space: Geometric Meaning
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Survival Time in Black Hole: Myth Debunked
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad Geodesic Equation: Understanding Proper Time & x^α
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Evaluating metric tensor in a primed coordinate system
  • · Replies 7 ·
Replies
7
Views
3K
Undergrad Velocity difference not preserved in special relativity
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Gravitational Waves Affecting EM Fields: Evidence & Implications
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad Time & Space Expansion: High Schooler Qs
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad Einstein's views on gravity and inertia
  • · Replies 9 ·
Replies
9
Views
3K
Undergrad Can light near a black hole travel in -t in external coords?
  • · Replies 10 ·
Replies
10
Views
3K
Undergrad Some suspected Black hole mergers
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Tetrad formalism outside of the equatorial plane
  • · Replies 17 ·
Replies
17
Views
2K
Undergrad Definition of Vector Field in General Relativity
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad What happens to the stuff that enters a black hole?
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad Energy Change: PE to KE in Different Frames
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad Is Length Contraction Accounted for in the Analysis of a Moving Clock?
  • · Replies 15 ·
Replies
15
Views
2K
Undergrad Non-zero components of Riemann curvature tensor with Schwarzschild metric
  • · Replies 14 ·
Replies
14
Views
8K
Undergrad Atomic Clock Running Rate: Adjustment Possibilities?
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Verifying claims about backwards time travel
  • · Replies 19 ·
Replies
19
Views
2K
Undergrad Is my thought right or wrong? Light and a moving observer
  • · Replies 27 ·
Replies
27
Views
3K
Undergrad An exception to the principle of equivalence?
  • · Replies 18 ·
Replies
18
Views
2K
Undergrad Metric & One Forms: A R2 Confusion
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad Transformer Output in Non-inertial Frame: Frequency Change?
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Help with special relativity mathematics
  • · Replies 14 ·
Replies
14
Views
2K
Undergrad How does time add up to 1 second with infinite smaller amounts of time?
  • · Replies 16 ·
Replies
16
Views
2K
Undergrad Conserved Quantities in GR: Explained
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Was Einstein's Proof of E=MC^2 Flawed?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Time Dilation: Get Answers to Your Questions
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Time Dilation and photodetectors
  • · Replies 28 ·
Replies
28
Views
3K
Undergrad Non-Coordinate Bases Explained
  • · Replies 27 ·
Replies
27
Views
4K
Undergrad Frame Dragging Direction for Outward Moving Test Mass
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Do Massless Particles Have Transitory Mass During Reflection?
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad Time dilation again, Einstein or Resnick?
  • · Replies 114 ·
4
Replies
114
Views
10K
Undergrad Confusion with relativity of simultaneity
  • · Replies 29 ·
Replies
29
Views
4K
Undergrad Gravity changes produced by a compressed and stretched spring
  • · Replies 70 ·
3
Replies
70
Views
7K
Undergrad Twin paradox not including accelerations, it is wrong where?
  • · Replies 72 ·
3
Replies
72
Views
9K
Undergrad What is the Alice/Bob thought experiment in Malament-Hogarth spacetime?
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Relative Speed Impact on Synchronization: Clock Comparison
  • · Replies 19 ·
Replies
19
Views
2K
Undergrad Computational physics - Light trajectory near black hole
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad GR: Mass of Potential Energy in Weak Field Limit
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Questions about the general principle of relativity
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad Does Gravity Affect Space Density in a Vacuum?
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad How Does the Einstein Equivalence Principle Explain Energy Source Curvature?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Electric currents and length contraction
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Why transformed E and B are asymmetric?
  • · Replies 8 ·
Replies
8
Views
1K
Undergrad Understanding the Einstein Equivalence Principle
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Gravitational field seen be relativistic particle
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Velocity measurement by a stationary observer in GR
  • · Replies 46 ·
2
Replies
46
Views
7K
Undergrad Lie Derivatives vs Parallel Transport
  • · Replies 7 ·
Replies
7
Views
4K
Undergrad Demonstration of time dilation
  • · Replies 21 ·
Replies
21
Views
3K
Undergrad Why do particles move along longest proper time trajectories
  • · Replies 42 ·
2
Replies
42
Views
7K
Undergrad Electrical Current Repelling Magnets Due to Relativity
  • · Replies 8 ·
Replies
8
Views
2K