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.
B Perception of Velocity in Special Relativity
  • · Replies 42 ·
2
Replies
42
Views
4K
B How to Add Metres & Seconds for Equal ds2: Einstein's Theory
  • · Replies 22 ·
Replies
22
Views
2K
I Why do strong fields complicate our understanding of singularities?
  • · Replies 33 ·
2
Replies
33
Views
2K
Question About Text: Example 4.1 on Page 35-6
  • · Replies 3 ·
Replies
3
Views
1K
A Interior volume of a black hole
  • · Replies 23 ·
Replies
23
Views
3K
I Schwarzschild Geometry: Einstein Tensor & Mass Density
  • · Replies 18 ·
Replies
18
Views
2K
I How fast does the particle go through spacetime?
  • · Replies 20 ·
Replies
20
Views
2K
B What is the metric for a bag-of-gold spacetime?
  • · Replies 9 ·
Replies
9
Views
1K
B How do Black Holes Grow? A Far-Away Observer's Perspective
  • · Replies 67 ·
3
Replies
67
Views
5K
I Inertial Gravity in Relativistic Geodesics - Forum Discussion
  • · Replies 11 ·
Replies
11
Views
2K
B Do Gravitational Forces Increase for Objects Moving at Light Speed?
  • · Replies 16 ·
Replies
16
Views
3K
B Speed of Light Reflection: Einstein's Train & Mirrors
  • · Replies 38 ·
2
Replies
38
Views
4K
B Does Gravitation Start at Black Hole Event Horizon?
  • · Replies 9 ·
Replies
9
Views
2K
A Origin of BH Entropy & Info Missing Puzzle Resolution
  • · Replies 6 ·
Replies
6
Views
2K
I Numerical Solution of Complex Systems in GR
  • · Replies 5 ·
Replies
5
Views
1K
I Sabine Hossenfelder says time dilation is due to acceleration
  • · Replies 47 ·
2
Replies
47
Views
5K
I What is the velocity of a photon through the four dimensions?
  • · Replies 9 ·
Replies
9
Views
2K
I Escape from Two Black Holes? Solve the Mystery!
  • · Replies 2 ·
Replies
2
Views
2K
A Why can't we say that photon has very very small mass?
  • · Replies 13 ·
Replies
13
Views
2K
A Minkowski Spacetime 3+1 Dimensions: Conformal Diagram w/Boundary
  • · Replies 23 ·
Replies
23
Views
2K
A GW Binary Merger: Riemann Tensor in Source & TT-Gauge
  • · Replies 4 ·
Replies
4
Views
2K
A Special & General Relativity: CTC Metrics in Cylindrical Coordinates
  • · Replies 5 ·
Replies
5
Views
2K
B A Scenic Trip as a Spaceship at 0.999...c, and questions that arise
  • · Replies 36 ·
2
Replies
36
Views
4K
B The synchronization of clocks and the relativity of motion
  • · Replies 84 ·
3
Replies
84
Views
6K
I Time Paradox: A & B's Clocks Move Differently
  • · Replies 6 ·
Replies
6
Views
2K
I Worldline Curve vs Trajectory: What’s the Difference?
  • · Replies 10 ·
Replies
10
Views
2K
B Black Holes: How Do They Move?
  • · Replies 22 ·
Replies
22
Views
3K
B Four Velocity Sign of Time: \dot t>0?
  • · Replies 3 ·
Replies
3
Views
2K
A Hyperplanes of Simultaneity and BigBang
  • · Replies 27 ·
Replies
27
Views
2K
I Universe Expansion: GR vs Hubble Reconciled
  • · Replies 5 ·
Replies
5
Views
2K
B Is Time Dilation About Particle Motion Rather Than Time Itself?
  • · Replies 53 ·
2
Replies
53
Views
5K
A Solving Geodesics with Metric $$ds^2$$
  • · Replies 10 ·
Replies
10
Views
2K
I Can worldlines exist that defy traditional spacetime classifications?
  • · Replies 18 ·
Replies
18
Views
2K
B FRB & Gravitational Wave Link: Scientists Baffled
  • · Replies 4 ·
Replies
4
Views
2K
I Black holes to explode due to evaporation?
  • · Replies 57 ·
2
Replies
57
Views
6K
I Do objects gain mass while approaching light speed?
  • · Replies 25 ·
Replies
25
Views
3K
Insights Why There Are Maximum Mass Limits for Compact Objects
  • · Replies 3 ·
Replies
3
Views
3K
I Kerr & Nordström Black Hole Evaporation: Q&A
  • · Replies 3 ·
Replies
3
Views
2K
B Explaining Distant Time Dilation & Enhanced Gravitation
  • · Replies 4 ·
Replies
4
Views
2K
B Is Einstein's Space-Time Theory Overfitted or Simply a Visualization Tool?
  • · Replies 29 ·
Replies
29
Views
3K
B The Effect of Binding Energy on Mass
  • · Replies 5 ·
Replies
5
Views
2K
I Observed Redshift from Moving Source: Deriving the Result
  • · Replies 5 ·
Replies
5
Views
2K
I Gravitational Field Transformations Under Boosted Velocity
  • · Replies 14 ·
Replies
14
Views
3K
I Light-Like Separation: Is It Possible?
  • · Replies 4 ·
Replies
4
Views
1K
B Explaining Galaxy Rotation Speed Discrepancies with GR & Gravitic Fields
  • · Replies 22 ·
Replies
22
Views
4K
I How to obtain other inverse metrics than that of Schwarzschild?
  • · Replies 50 ·
2
Replies
50
Views
4K
B Block universe theory question
  • · Replies 53 ·
2
Replies
53
Views
4K
I Has anyone measured the speed of light in one direction?
  • · Replies 45 ·
2
Replies
45
Views
6K
B Spagettification and a singularity
  • · Replies 167 ·
6
Replies
167
Views
7K
B The twin paradox and black holes
  • · Replies 31 ·
2
Replies
31
Views
2K
I Dark Energy Strength in Great Voids of Galaxies
  • · Replies 7 ·
Replies
7
Views
2K
A Solving "const. K" in Gourgoulhon's SR in General Frames
  • · Replies 4 ·
Replies
4
Views
2K
B Questions on the Michelson Morley Experiment
  • · Replies 47 ·
2
Replies
47
Views
6K
I Gravitational Field Existence in Void: Philosophical Inquiry
  • · Replies 1 ·
Replies
1
Views
2K
A How Does Linear Framedragging Affect Parallel Moving Masses in Flat Spacetime?
  • · Replies 11 ·
Replies
11
Views
2K
I Relativity & Simultaneity Convention: Meaning & Impact
  • · Replies 12 ·
Replies
12
Views
2K
B Phase Change in Light: A & B Signal Reflections
  • · Replies 31 ·
2
Replies
31
Views
2K
B Why Don't We Live Inside a Black Hole?
  • · Replies 3 ·
Replies
3
Views
2K
I Circular Orbit in Schwarzschild: Orbital Period
  • · Replies 5 ·
Replies
5
Views
3K
I Explore Spacetimes, Metrics & Symmetries in Relativity Theory
  • · Replies 7 ·
Replies
7
Views
3K
A Understanding killing vectors and transformations of metric
  • · Replies 45 ·
2
Replies
45
Views
5K
B Is Brian or Jim Wrong? (the science of Dr. Who)
  • · Replies 10 ·
Replies
10
Views
2K
B Mick's Spooky Time Dilation Puzzle
  • · Replies 3 ·
Replies
3
Views
2K
A Landau's Maximum Mass Limit Derivation in Shapiro & Teukolsky (1983)
  • · Replies 23 ·
Replies
23
Views
3K
A Motivation for Theta = Pi/2 on Wald GR p138
  • · Replies 5 ·
Replies
5
Views
2K
I Error in Concepts: Intro to Mechanics Kolenkow & Kleppner
  • · Replies 8 ·
Replies
8
Views
2K
I Can Crafts Reach 2c Relative to Me?
  • · Replies 3 ·
Replies
3
Views
2K
B What limits the speed of a gravitational wave to c?
  • · Replies 13 ·
Replies
13
Views
3K
B Relativity of Measures: A vs B Frame & Light Source S
  • · Replies 143 ·
5
Replies
143
Views
9K
B Mechanics behind curved time causing gravitation/geodesics
  • · Replies 27 ·
Replies
27
Views
6K
B Speed of light and this Accelerating Rocket scenario
  • · Replies 45 ·
2
Replies
45
Views
5K
I No Symmetry Spacetimes/Metrics in Theory of Relativity
  • · Replies 7 ·
Replies
7
Views
2K
I Twin Paradox: Aging Slower with Continuous Acceleration?
  • · Replies 13 ·
Replies
13
Views
3K
B Cherenkov Radiation -- How does this not break causality?
  • · Replies 21 ·
Replies
21
Views
3K
I Derivation of SR's time-dilatation in 1d?
  • · Replies 60 ·
3
Replies
60
Views
5K
I What Is the Geometrical Meaning of Principal Null Directions?
  • · Replies 3 ·
Replies
3
Views
4K
A Proper Volume on Constant Hypersurface in Alcubierre Metric
  • · Replies 7 ·
Replies
7
Views
2K
B Where does the energy of gravity come from?
  • · Replies 73 ·
3
Replies
73
Views
7K
I Schwarzschild in Cartesian: Tricks for Transformation
  • · Replies 18 ·
Replies
18
Views
4K
I Differentiate w/ Respect to Affine Parameter
  • · Replies 10 ·
Replies
10
Views
2K
I Understanding Einstein's second postulate of special relativity
  • · Replies 57 ·
2
Replies
57
Views
7K
B Calculating Fuel Efficiency of Rocket Going Near c
  • · Replies 2 ·
Replies
2
Views
2K
I Solving Paradox: Man Running with Pole Reaches Door Before Button is Pressed
  • · Replies 27 ·
Replies
27
Views
3K
I Lack of Symmetry in X & T: Explained for Beginners
  • · Replies 13 ·
Replies
13
Views
2K
I Can time be another basis vector under Galilean relativity?
  • · Replies 146 ·
5
Replies
146
Views
10K
I Black Holes: Event Horizon Causally Disconnected?
  • · Replies 21 ·
Replies
21
Views
3K
I Solving Spherically Symmetric Static Star Equations of Motion
  • · Replies 2 ·
Replies
2
Views
2K
A Dirac's Conservation of Matter: A Closer Look
  • · Replies 7 ·
Replies
7
Views
2K
I Time dilatopause for black holes
  • · Replies 36 ·
2
Replies
36
Views
4K
A Get GR Tensor II: Where to Buy Program Library
  • · Replies 1 ·
Replies
1
Views
2K
B How do we identify a stationary system?
  • · Replies 43 ·
2
Replies
43
Views
4K
B A thought experiment of the relativity of light
  • · Replies 76 ·
3
Replies
76
Views
5K
I Doppler Effect on Light: Constant Speed of Light Confusion
  • · Replies 9 ·
Replies
9
Views
3K
I Time Dilation Paradox: Geosynchronous Satellites
  • · Replies 5 ·
Replies
5
Views
2K
A Why are General relativity texts so much more formal?
  • · Replies 28 ·
Replies
28
Views
3K
I How to rule out that the speed of light was different in the past?
  • · Replies 76 ·
3
Replies
76
Views
6K
B Find Geodesics in Dynamic Ellis Orbits Metric
  • · Replies 92 ·
4
Replies
92
Views
6K
I How meaningful is the notion of now here on Earth?
  • · Replies 1 ·
Replies
1
Views
1K
A Going from Cauchy Stress Tensor to GR's Energy Momentum Tensor
  • · Replies 3 ·
Replies
3
Views
2K
I Effects of time dilation for near-speed-of-light travel
  • · Replies 65 ·
3
Replies
65
Views
11K