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.
Graduate Intergalactic Space & the Minkowski Diagram
  • · Replies 14 ·
Replies
14
Views
2K
Graduate Is the train in the circular track paradox similar to the barn/pole paradox?
  • · Replies 66 ·
3
Replies
66
Views
7K
Graduate Has Speed of Light Always Stayed Same?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Define Mass: Travels Through Time?
  • · Replies 2 ·
Replies
2
Views
1K
Graduate Is There a Hidden Meaning in Integrating the Lorentz Factor with Trig Sub?
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Can a "density" of points create curvature?
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Lorentz Transformations or Dilation/Contraction?
  • · Replies 23 ·
Replies
23
Views
4K
Graduate Are length and time Trade-offs in relativity?
  • · Replies 10 ·
Replies
10
Views
2K
Graduate Null geodesic definition (by extremisation?)
  • · Replies 18 ·
Replies
18
Views
6K
Graduate Independent Killing vector field
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Questions of Absolute Light Speed & Mass by an Engineer
  • · Replies 14 ·
Replies
14
Views
2K
Graduate Question about relativity of simultaneity
  • · Replies 10 ·
Replies
10
Views
2K
Graduate Does the photon have a 4-velocity in a medium?
  • · Replies 82 ·
3
Replies
82
Views
10K
Graduate Unbounded perturbed geometry due to analyticity
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Statistical Mechanics in GR: Basics & Applications
  • · Replies 15 ·
Replies
15
Views
2K
Undergrad Hyper-Light Speed: What Happens?
  • · Replies 4 ·
Replies
4
Views
1K
Graduate Is There More to Special Relativity?
  • · Replies 6 ·
Replies
6
Views
1K
Graduate Principle of relativity and invariance of c
  • · Replies 1 ·
Replies
1
Views
1K
High School Why is gravitational force always attractive in nature?
  • · Replies 17 ·
Replies
17
Views
9K
Graduate Speed of Light Since Big Bang: Evidence & Theory
  • · Replies 2 ·
Replies
2
Views
1K
Graduate Understanding Vaidya Metric & Pure Radiation Stress-Energy
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Is Time Dilation Misunderstood in Popular Science Videos?
  • · Replies 77 ·
3
Replies
77
Views
8K
Graduate Find Perfect Fluid & EM Tensor in Rest Frame
  • · Replies 6 ·
Replies
6
Views
2K
Graduate Why a vector field can not be used to describe gravity?
  • · Replies 9 ·
Replies
9
Views
3K
Graduate Length Contraction & Galaxies: Time Dilation Adjustments
  • · Replies 8 ·
Replies
8
Views
2K
Graduate Could Length Contraction Provide Insights into Quantum Entanglement Paradoxes?
  • · Replies 2 ·
Replies
2
Views
1K
Graduate Could FTL Communication be Achieved via Mechanical Connection?
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad Gravitational Field Strength of 1
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Can someone falling into a black hole see the entire future of the universe?
  • · Replies 6 ·
Replies
6
Views
2K
Graduate Reference book for ADM formalism
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Looking for sources for deprecation of relativistic mass
  • · Replies 8 ·
Replies
8
Views
2K
Graduate Explanation of time dilation due to c being the maximum speed
  • · Replies 29 ·
Replies
29
Views
3K
Graduate Speed of light relative to observers?
  • · Replies 34 ·
2
Replies
34
Views
5K
Graduate Time Dilation at ISCO for Kerr Black Holes
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Time in Relativity & Quantum Mechanics: A Philosophical Perspective
  • · Replies 3 ·
Replies
3
Views
1K
Graduate Ergoregions and Energy Extraction
  • · Replies 36 ·
2
Replies
36
Views
4K
Undergrad What's the fate of neutrons in black hole formation?
  • · Replies 23 ·
Replies
23
Views
3K
High School Randall Munroe Explains General Relativity
  • · Replies 20 ·
Replies
20
Views
5K
Undergrad Relativistic Doppler Effect: Explaining the Equation
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Is X's Clock Really Slower Than Y's in the STR Argument?
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad Andrei Lebed: Hydrogen Spectral Transitions Without Gravity
  • · Replies 2 ·
Replies
2
Views
1K
Graduate What is the difference between Boost and Translation?
  • · Replies 10 ·
Replies
10
Views
7K
Graduate Does the Circular Twin Paradox Challenge Our Understanding of Time Dilation?
  • · Replies 29 ·
Replies
29
Views
4K
High School Relationship between Mass and Speed of Light
  • · Replies 4 ·
Replies
4
Views
1K
Graduate Eigenvalues of curvature tensors as curvature scalars?
  • · Replies 13 ·
Replies
13
Views
5K
Undergrad Diffraction Redshift and Emission Theory
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Time & The Special Theory of Relativity
  • · Replies 7 ·
Replies
7
Views
2K
Graduate Can Gravitational Binding Energy Cause Negative Effective Mass?
  • · Replies 6 ·
Replies
6
Views
3K
Graduate Hawking radiation no change to black hole mass?
  • · Replies 16 ·
Replies
16
Views
2K
High School Speed of Light & Thought Exp: How to Send Info 186K Miles Instantly
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Question about Purcell - Electricity and Magnetism
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Is Hawking's statement of Raychaudhuri's equation wrong?
  • · Replies 6 ·
Replies
6
Views
2K
Graduate What is Einstein's Hamiltonian for the Gravitational Field?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad What is the structure of a photon and can it be observed?
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Unpredictable Outcomes: What Happens When Falling into a Black Hole?
  • · Replies 8 ·
Replies
8
Views
2K
Graduate Singularity Theorems: An Accessible Reference
  • · Replies 3 ·
Replies
3
Views
1K
Graduate Does temperature in special relativity depend on the frame of observation?
  • · Replies 8 ·
Replies
8
Views
2K
Graduate Time Travel: How Far & Fast to Reach Alien Neighbors?
  • · Replies 4 ·
Replies
4
Views
2K
High School Deriving GR without EFE: Could it be this Simple?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Observer Falling Into a Black Hole -- What do they see?
  • · Replies 16 ·
Replies
16
Views
3K
Graduate Faster Than Light Communication Through Space-Time Bubbles
  • · Replies 2 ·
Replies
2
Views
1K
Graduate Ergosphere and angular velocity
  • · Replies 20 ·
Replies
20
Views
3K
Graduate Proof than an equation is Lorentz invariant
  • · Replies 8 ·
Replies
8
Views
6K
Undergrad Theory of Relativity & Gravity: Is Space Pushing Us to Earth?
  • · Replies 3 ·
Replies
3
Views
1K
Graduate Conservation laws with Killing fields
  • · Replies 19 ·
Replies
19
Views
6K
Graduate Does E in E=mc^2 Include Gravity?
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Relativistic Lagrangian and Hamiltonian for a free particle
  • · Replies 7 ·
Replies
7
Views
4K
Graduate Time Distortion at High Altitudes: Is Now Still Now?
  • · Replies 4 ·
Replies
4
Views
1K
Graduate Observer dependent event horizon for Schwarzschild black hole
  • · Replies 21 ·
Replies
21
Views
4K
Graduate Action and reaction when fast object is pushed
  • · Replies 5 ·
Replies
5
Views
1K
Graduate Signal time in Twin Paradox: Fast clocks? Redshift/blueshift
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Integration by parts in curved space time
  • · Replies 13 ·
Replies
13
Views
6K
Graduate Curvature singularity with well-behaved Kretschmann scalar
  • · Replies 22 ·
Replies
22
Views
5K
Graduate Fun with Carminati-McLenaghan invariants
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Can electron be considered a Source of gravitational field?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Faster than the speed of light?
  • · Replies 28 ·
Replies
28
Views
4K
Graduate What time dilation do muon observers experience?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Twin Paradox: Relation between Age and Speed of light .
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Kinetic energy of a spinning body
  • · Replies 24 ·
Replies
24
Views
4K
Undergrad Does continuous acceleration eventually create a black hole
  • · Replies 6 ·
Replies
6
Views
1K
Graduate Local Inertial Frame in General Relativity - Neutrino
  • · Replies 16 ·
Replies
16
Views
3K
Graduate LISA Pathfinder Launch on Dec 2: Einstein's Last Theory
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Uniformly accelerating frame of reference
  • · Replies 42 ·
2
Replies
42
Views
5K
Graduate Calculate Time Dilation for Space Travel w/ Formula
  • · Replies 10 ·
Replies
10
Views
3K
Graduate Time Dilation: Rel. Ref. Frames and Universal Reference Frame
  • · Replies 7 ·
Replies
7
Views
1K
Graduate Curvature polynomials vanish for plane waves?
  • · Replies 10 ·
Replies
10
Views
2K
Graduate How did Einstein know speed of gravity?
  • · Replies 10 ·
Replies
10
Views
2K
High School Time Dilation for Slower Objects - Physics Explained
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Is it time to "retire" time dilation and length contraction?
  • · Replies 125 ·
5
Replies
125
Views
11K
High School Inside the Moving Truck: A Fly's Dilemma
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Basic Questions on Time Dilation Implications
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad Why Is the Proportionality Constant in E=mc² Just c²?
  • · Replies 15 ·
Replies
15
Views
3K
Graduate Relativistic Speed Travel: What is the Effective Speed?
  • · Replies 13 ·
Replies
13
Views
2K
Graduate Speed of an object in a rotating frame
  • · Replies 34 ·
2
Replies
34
Views
3K
Graduate Relativistic Euler Equation in Spherical Coordinates
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Twins flying at the speed of light in opposite directions
  • · Replies 68 ·
3
Replies
68
Views
7K
Graduate Could you express GR in terms of a density of spacetime?
  • · Replies 23 ·
Replies
23
Views
4K
Graduate Warp drives and event horizons
  • · Replies 18 ·
Replies
18
Views
4K
Insights The Block Universe - Refuting a Common Argument - Comments
  • · Replies 146 ·
5
Replies
146
Views
16K
Graduate Relativistic momentum (Lorentz boost) low velocity limit
  • · Replies 1 ·
Replies
1
Views
1K