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.
Insights What Is the Bell Spaceship Paradox, and How Is It Resolved? - Comments
  • · Replies 27 ·
Replies
27
Views
4K
Graduate Geodesic Eq: Deriving 2nd Term on RHS
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Null geodesics and null curves
  • · Replies 3 ·
Replies
3
Views
3K
High School Is there a connection between gravity and the pace of time?
  • · Replies 16 ·
Replies
16
Views
2K
Graduate Runaway solutions and the equivalence principle
  • · Replies 9 ·
Replies
9
Views
3K
Graduate Why does length contraction not cause Black holes?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad How Much Time Do We Actually Occupy in the Universe?
  • · Replies 9 ·
Replies
9
Views
1K
Graduate Measuring 4-Vectors: Is It Possible?
  • · Replies 10 ·
Replies
10
Views
1K
Graduate Time-orientability of Lorentzian manifolds
  • · Replies 21 ·
Replies
21
Views
4K
Graduate Does a black hole have a surface area?
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Implications of Light Orbiting Black Holes
  • · Replies 5 ·
Replies
5
Views
1K
Graduate Some questions regarding speed of light?
  • · Replies 8 ·
Replies
8
Views
2K
Graduate Where does photon energy go in universe expansion?
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Modeling of measurements in relativity
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad Special relativity -- 2 parallel space ships & time perception....
  • · Replies 17 ·
Replies
17
Views
2K
Graduate Is There a Limit to the Size of a Black Hole?
  • · Replies 10 ·
Replies
10
Views
2K
Graduate Trying to prove a consequence of harmonic gauge in GR
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Why an Infinite Lattice Cannot Be Stable: An Analysis of Peter Donis' Answers
  • · Replies 17 ·
Replies
17
Views
2K
Graduate Local Geometry of General Relativity Theory
  • · Replies 6 ·
Replies
6
Views
1K
Graduate Is this the one way speed of light?
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Time Dilation & Doppler Effect: Conclusions?
  • · Replies 16 ·
Replies
16
Views
2K
Graduate Testing Understanding: Conformally Flat Space-Time
  • · Replies 15 ·
Replies
15
Views
2K
Graduate Does Space Expansion Add Potential Energy?
  • · Replies 16 ·
Replies
16
Views
2K
Graduate Whether gravitons can exist or not
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Can We Make Velocity Greater Than Speed of Light?
  • · Replies 10 ·
Replies
10
Views
2K
High School Do Gravitational Time Dilation and Redshift Contradict Each Other?
  • · Replies 27 ·
Replies
27
Views
4K
Graduate GR: Signature & Dimension of Embedding Space
  • · Replies 2 ·
Replies
2
Views
2K
Graduate How does curved space-time produce acceleration?
  • · Replies 25 ·
Replies
25
Views
8K
Undergrad Understanding Wormholes & Black Holes: An Exploration by Ed
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Coarse-Grained Einstein Tensor from Weyl Tensor
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Mass of Electron: Relativity & Its Definite Mass
  • · Replies 20 ·
Replies
20
Views
10K
Graduate Couple of questions regarding general relativity?
  • · Replies 3 ·
Replies
3
Views
1K
Graduate Stress Energy Tensor Components
  • · Replies 14 ·
Replies
14
Views
8K
Graduate How to find gravity using general relativity?
  • · Replies 13 ·
Replies
13
Views
2K
Graduate Commutator of two covariant derivatives
  • · Replies 5 ·
Replies
5
Views
4K
Graduate Compress Magnetic Field: What Happens When Spun at High RPM?
  • · Replies 4 ·
Replies
4
Views
1K
Graduate Validity of Schwarzschild Metric in Real BHs
  • · Replies 5 ·
Replies
5
Views
2K
Graduate What is the Purpose of the Geodesic Equation in General Relativity?
  • · Replies 9 ·
Replies
9
Views
2K
Graduate Tensor software for General Relativity
  • · Replies 17 ·
Replies
17
Views
8K
Graduate What is the significance of proper time in the Rain Frame of General Relativity?
  • · Replies 8 ·
Replies
8
Views
2K
Graduate Derive Lorentz Transformations w/ Special Relativity
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Properties of light in 2 moving reference frames
  • · Replies 29 ·
Replies
29
Views
4K
Graduate How does this proof demonstrate the concept of time dilation?
  • · Replies 51 ·
2
Replies
51
Views
5K
Graduate Would an infinite universe has a finite diameter?
  • · Replies 7 ·
Replies
7
Views
2K
Graduate Acceleration in a space time diagram
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Why Do Gravitational Waves Occur?
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Understanding Inertial Frame of Reference
  • · Replies 8 ·
Replies
8
Views
2K
Graduate The Equivalence of Mass and Energy
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad Black Hole Effects: What Would Happen?
  • · Replies 3 ·
Replies
3
Views
1K
High School Gravity: Einstein vs. Newton View
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Gravity as a distorion of space-time
  • · Replies 7 ·
Replies
7
Views
2K
High School Gravitational red shift and gravitational time dilation
  • · Replies 14 ·
Replies
14
Views
4K
Graduate Acceleration vs Gravity: Understanding Einstein's Theory | PF Forum"
  • · Replies 13 ·
Replies
13
Views
2K
Graduate What is the boost hamiltonian in the Unruh effect?
  • · Replies 4 ·
Replies
4
Views
2K
High School Travel at 3,000,001 m/s: Time Travel Explained
  • · Replies 7 ·
Replies
7
Views
1K
Graduate Faster Than Light Travel: What Happens to Destination's Time?
  • · Replies 19 ·
Replies
19
Views
2K
Graduate Unit of Acceleration: Calculating Speed with Velocity Addition Formula
  • · Replies 40 ·
2
Replies
40
Views
4K
Graduate Lorentz scalars - transformation of a scalar field
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Calculating relativistic effects of motion in solar system
  • · Replies 3 ·
Replies
3
Views
2K
Graduate General Relativity and continuum mechanics
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Trying to clear up some confusion (clock synchronization)
  • · Replies 31 ·
2
Replies
31
Views
3K
Graduate Measuring Motion: What STAY Knows About TRAVEL
  • · Replies 2 ·
Replies
2
Views
1K
Graduate How does matter know how to move?
  • · Replies 4 ·
Replies
4
Views
2K
High School Why does light travels in all directions?
  • · Replies 1 ·
Replies
1
Views
4K
Graduate Studying Special Features in Metrics: Tensors & Differential Geom.
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Weyl tensor for the Godel metric interpretation
  • · Replies 26 ·
Replies
26
Views
4K
Graduate Does a Photon Experience Time or Space During Travel?
  • · Replies 32 ·
2
Replies
32
Views
4K
Graduate General Lorentz transformation, spatial vector components
  • · Replies 10 ·
Replies
10
Views
3K
Graduate Meaning of r in Schwarzchild coordinates
  • · Replies 56 ·
2
Replies
56
Views
5K
Graduate Train Experiment Problem: Solve Derailment Mystery!
  • · Replies 4 ·
Replies
4
Views
1K
Graduate Traveling near the speed of light
  • · Replies 69 ·
3
Replies
69
Views
8K
Graduate Describe the mechanism in GR causing *Space* expansion
  • · Replies 22 ·
Replies
22
Views
3K
Graduate What Happens to Euler-Lagrange in Field Theories (ADM)?
  • · Replies 4 ·
Replies
4
Views
1K
Graduate Does the Hubble expansion of space have a preferred frame?
  • · Replies 13 ·
Replies
13
Views
2K
Graduate Understanding the Doppler Effect: Formula and Examples for Light Waves
  • · Replies 50 ·
2
Replies
50
Views
6K
Graduate Twins Paradox: Nature Cheats but B Gets Fooled
  • · Replies 6 ·
Replies
6
Views
1K
Graduate Doubt in Relativity of Simultaneity
  • · Replies 46 ·
2
Replies
46
Views
5K
Graduate Torsion Scalar and Symmetries of Torsion Tensor
  • · Replies 5 ·
Replies
5
Views
2K
High School Time Travel - Does It Create a New Dimension?
  • · Replies 6 ·
Replies
6
Views
2K
High School Smallest Schwarzschild Radius: Theory & Facts
  • · Replies 12 ·
Replies
12
Views
2K
Graduate What Are the Differences Between Space-like and Time-like Events in Spacetime?
  • · Replies 8 ·
Replies
8
Views
2K
Graduate Why do diffeomorphic manifolds have physically identical properties?
  • · Replies 12 ·
Replies
12
Views
5K
Graduate Why does imaginary time behave like space?
  • · Replies 9 ·
Replies
9
Views
2K
Graduate Space-intervals, proper time, and proper distance
  • · Replies 5 ·
Replies
5
Views
4K
Graduate Measuring distance, speed and clock
  • · Replies 114 ·
4
Replies
114
Views
10K
Graduate Solving Exercise 13.7 MTW Using Light Signals
  • · Replies 2 ·
Replies
2
Views
1K
Graduate Special Relativity Train Scenario
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Measuring Speed with Doppler Effect: Questions and Challenges
  • · Replies 9 ·
Replies
9
Views
2K
Graduate Doppler Effect in Relativity: Mirror vs Lamp
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Is There a Connection Between the Higgs Field and Relativity's Time Distortion?
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Stationary/extremal L for timelike/null/spacelike geodesics
  • · Replies 42 ·
2
Replies
42
Views
6K
Graduate Simultaneity of Events: Understanding Observer Perspectives on Time
  • · Replies 18 ·
Replies
18
Views
3K
Graduate Consequences of space-/time-/light-like separations
  • · Replies 4 ·
Replies
4
Views
2K
High School Speed of Light, Rapidity & Cantor's Infinities
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Generic Soliton Solution Periodicity: Restrictions & Examples
  • · Replies 2 ·
Replies
2
Views
1K
Graduate D'Alembert operator is commute covariant derivative?
  • · Replies 3 ·
Replies
3
Views
4K
Graduate Time: Travelling Twins vs Black Hole Gravity
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad Particles with mass can't reach speed of light?
  • · Replies 18 ·
Replies
18
Views
3K
Graduate Coincidence of spacetime events & frame independence
  • · Replies 41 ·
2
Replies
41
Views
5K
Graduate Normal Vector for Null Surfaces: How to Define and Fix it Completely?
  • · Replies 4 ·
Replies
4
Views
3K