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.
High School Question about Morin's time dilation explanation
  • · Replies 73 ·
3
Replies
73
Views
5K
Undergrad The speed of one photon through a transparent medium
  • · Replies 74 ·
3
Replies
74
Views
5K
Graduate Correspondence between areal radius differences and proper distances
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad What is Earth's escape velocity?
  • · Replies 8 ·
Replies
8
Views
2K
Graduate How to Express the Schwarzschild Metric in Fermi Normal Coordinates?
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad Analyzing Time Dilation in a Spaceship-Mars Scenario
  • · Replies 14 ·
Replies
14
Views
2K
High School How do you project a Killing Vector onto a Schwarzschild field?
  • · Replies 6 ·
Replies
6
Views
1K
Undergrad What Happens When an Object Accelerating Away from a Black Hole Stops?
  • · Replies 35 ·
2
Replies
35
Views
4K
Undergrad How Does Special Relativity Affect Perceived Distances Between Planets?
  • · Replies 101 ·
4
Replies
101
Views
4K
Undergrad Invariant definition of acceleration in Newtonian physics vs proper acceleration in GR
  • · Replies 30 ·
2
Replies
30
Views
2K
Undergrad Interpretation of (X,T) coordinates in Kruskal diagram
  • · Replies 34 ·
2
Replies
34
Views
2K
High School Is imaginary time a fourth dimension?
  • · Replies 13 ·
Replies
13
Views
2K
High School Minkowski Spacetime vs Euclidean Spacetime
  • · Replies 11 ·
Replies
11
Views
1K
High School Stationary charge next to a current-carrying wire
  • · Replies 68 ·
3
Replies
68
Views
5K
Undergrad A mirror behind the event horizon
  • · Replies 18 ·
Replies
18
Views
1K
High School What does the Minkowski spacetime interval represent and how is it determined?
  • · Replies 20 ·
Replies
20
Views
2K
High School Very basic questions about visualizing spacetime
  • · Replies 7 ·
Replies
7
Views
1K
High School Question about choice of reference frame
  • · Replies 23 ·
Replies
23
Views
2K
Undergrad Schwarzschild spacetime in Kruskal coordinates
  • · Replies 43 ·
2
Replies
43
Views
3K
High School Can Motion Exceed the Speed of Light in General Relativity?
  • · Replies 20 ·
Replies
20
Views
2K
Undergrad Effects of magnetism on spacetime curvature, and implications
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad Equation of state for Einstein field equations
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Principle of relativity and Galileo's group
  • · Replies 10 ·
Replies
10
Views
2K
High School How to know what maximal atlas to use for spacetime manifold?
  • · Replies 12 ·
Replies
12
Views
2K
High School What does symmetry of time dilation really mean?
  • · Replies 16 ·
Replies
16
Views
2K
Undergrad Black hole singularity, a time-like surface?
  • · Replies 19 ·
Replies
19
Views
2K
Undergrad Is it only experience that's relative?
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad Question about the reciprocity of time dilation
  • · Replies 88 ·
3
Replies
88
Views
7K
Undergrad Question about time dilation symmetry
  • · Replies 27 ·
Replies
27
Views
2K
High School How does hawking radiation escape a black hole?
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad Is there a theorem that we can't see objects getting behind EHs?
  • · Replies 5 ·
Replies
5
Views
1K
High School Intuition for time dilation in a cesium clock
  • · Replies 58 ·
2
Replies
58
Views
5K
Graduate What Are the Must-Read Einstein Papers on General Relativity and Beyond?
  • · Replies 46 ·
2
Replies
46
Views
4K
Undergrad How Do Interparticle Interactions Affect Buoyant Force in Gases?
  • · Replies 0 ·
Replies
0
Views
855
Undergrad Linearising Christoffel symbols
  • · Replies 9 ·
Replies
9
Views
1K
Undergrad Intuition regarding Riemann curvature tensor
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Lie dragging vs Fermi-Walker transport along a given vector field
  • · Replies 26 ·
Replies
26
Views
2K
High School What Is the Fourth Dimension and How Does It Work?
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Negative energy in Hawking radiation
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Where exactly is the wormhole in the Kruskal-Szekeres diagram?
  • · Replies 43 ·
2
Replies
43
Views
6K
Undergrad Does the Alcubierre drive shorten distances?
  • · Replies 32 ·
2
Replies
32
Views
2K
High School A well defined thought experiment
  • · Replies 55 ·
2
Replies
55
Views
4K
Undergrad Lentz superluminial solution, anything new on it?
  • · Replies 1 ·
Replies
1
Views
717
High School Question about the relative motion of an eye relative to light source
  • · Replies 3 ·
Replies
3
Views
1K
High School Why Do Bob and Alice Disagree on Astronomical Measurements?
  • · Replies 25 ·
Replies
25
Views
1K
Undergrad From our reference frame, how would a black hole ever form?
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad Kerr disputes singularities in Kerr Black Holes
  • · Replies 7 ·
Replies
7
Views
4K
High School Understanding the Twin Paradox: Simplifying with a Clear Experiment
  • · Replies 14 ·
Replies
14
Views
2K
Graduate Model for Gravity -- What mechanism distorts space in the real case?
  • · Replies 60 ·
3
Replies
60
Views
5K
Undergrad Is the instantaneous collapse of the wave function frame dependent?
  • · Replies 9 ·
Replies
9
Views
1K
Undergrad 3+1 split of the Electromagnetic Tensor and Maxwell's Equations
  • · Replies 25 ·
Replies
25
Views
2K
Undergrad Calculation of Lie derivative - follow up
  • · Replies 27 ·
Replies
27
Views
1K
Undergrad Clock Synchronisation -- Do clock speeds go out of synch?
  • · Replies 59 ·
2
Replies
59
Views
4K
Undergrad How Does Mass Loss from Black Hole Mergers Affect Orbits?
  • · Replies 13 ·
Replies
13
Views
2K
High School Clock synchronising by clock transport?
  • · Replies 39 ·
2
Replies
39
Views
3K
Undergrad Variation of matter action under diffeomorphism (Carroll)
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Does SR Length Contraction Halve Space Travel Time?
  • · Replies 17 ·
Replies
17
Views
2K
Undergrad Numerical Relativity -- Software to solve the Einstein field equations?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Black Holes in Curved Spacetime
  • · Replies 23 ·
Replies
23
Views
4K
Undergrad Discover the Relationship Between Mass and Energy in Electromagnetic Fields
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad Supermassive black hole, surface gravity and tidal forces
  • · Replies 62 ·
3
Replies
62
Views
8K
Undergrad Spacecraft With Solar Mass Energy Equivalent Kinetic Energy
  • · Replies 79 ·
3
Replies
79
Views
4K
Undergrad Relativistic Lagrangian of a particle in EM field
  • · Replies 3 ·
Replies
3
Views
1K
High School Does shortness from length contraction have a real physical effect?
  • · Replies 12 ·
Replies
12
Views
2K
Undergrad Relativity: the Special and General theories
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad Integral curves of (timelike) smooth vector field
  • · Replies 26 ·
Replies
26
Views
2K
Undergrad Wald synchronous reference frame proof
  • · Replies 27 ·
Replies
27
Views
2K
High School Space Pulled into Gravity Well: What Happens?
  • · Replies 12 ·
Replies
12
Views
3K
High School Changing frames in the twin paradox?
  • · Replies 19 ·
Replies
19
Views
2K
Undergrad About global inertial frame in GR - revisited
  • · Replies 57 ·
2
Replies
57
Views
4K
High School Does a hot coffee have bigger mass than a cold coffee?
  • · Replies 102 ·
4
Replies
102
Views
7K
High School What does the term "age" mean in descriptions of the twin paradox?
  • · Replies 7 ·
Replies
7
Views
981
Undergrad Why Must Pure Force Depend on 4-Velocity?
  • · Replies 47 ·
2
Replies
47
Views
5K
High School Any Feasible Faster-Than-Light Interstellar Travel?
  • · Replies 4 ·
Replies
4
Views
2K
High School Redshift of a light pulse between 2 accelerating rockets
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Do any real macroscopic black holes have a singularity?
  • · Replies 11 ·
Replies
11
Views
2K
Graduate Photon speed for an observer at the photon sphere
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Terrell rotation is confusing!
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad SR textbooks discussing accelerated reference frames without delving into GR
  • · Replies 36 ·
2
Replies
36
Views
5K
Undergrad Speed of Light Could be Reached and Indeed even Exceeded
  • · Replies 21 ·
Replies
21
Views
2K
High School Can a Gravitational System be Treated as a Single Curved Spacetime?
  • · Replies 4 ·
Replies
4
Views
1K
Graduate Extra (boundary?) term in Brans Dicke field equations
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Congruent worldlines in "static" gravitational field
  • · Replies 42 ·
2
Replies
42
Views
3K
Undergrad Curved spacetime and measurement direction
  • · Replies 1 ·
Replies
1
Views
912
High School Relative rate of clock ticks on the radius of a rotating disc
  • · Replies 46 ·
2
Replies
46
Views
4K
Undergrad Minkowski metric and proper time interpretation
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Special Relativity: an ideal experiment
  • · Replies 21 ·
Replies
21
Views
2K
Undergrad Understanding Relativity of Simultaneity in Resnick, Part II
  • · Replies 20 ·
Replies
20
Views
2K
Undergrad Smooth coordinate chart on spacetime manifold
  • · Replies 51 ·
2
Replies
51
Views
3K
Undergrad Reference systems and apparent counter-explanations on Twin Paradox
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Understanding Relativity of Simultaneity in Resnick, Part I
  • · Replies 16 ·
Replies
16
Views
2K
High School How quickly does the Earth feel the effects of a halved Sun's mass?
  • · Replies 38 ·
2
Replies
38
Views
3K
Undergrad Is the Kroneker Delta Identity Used Correctly in this Paper?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Paradox of the car and the driver in SR
  • · Replies 23 ·
Replies
23
Views
2K
Undergrad Doubts about the relativistic description of electrical interactions
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad How Does Special Relativity Affect Perceptions of Simultaneity?
  • · Replies 32 ·
2
Replies
32
Views
2K
Undergrad How many meter sticks are there in this length contraction reasoning?
  • · Replies 12 ·
Replies
12
Views
2K
High School What Is Relativity Theory in Simple Terms?
  • · Replies 6 ·
Replies
6
Views
2K
High School Measuring the speed of light on moving systems
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad What causes the magnetic force in a uniform magnetic field?
  • · Replies 20 ·
Replies
20
Views
3K