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 Why do we Experience a 'Flow' of Time?
  • · Replies 106 ·
4
Replies
106
Views
9K
High School Gravity & Mass: Acceleration, Force & Basics Explained
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Deflection of Starlight by Newtonian Gravity - Example Calculation
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Two Dimensional Ricci curvature
  • · Replies 6 ·
Replies
6
Views
5K
Graduate Prove EL Geodesic and Covariant Geodesic Defs are Same via Riemmanian Geometry
  • · Replies 6 ·
Replies
6
Views
2K
High School Velocity of light and absolute rest
  • · Replies 27 ·
Replies
27
Views
4K
High School Is the time dimension more fundamental?
  • · Replies 34 ·
2
Replies
34
Views
5K
Graduate Understanding E-Field Transformation in Feynman II_26
  • · Replies 12 ·
Replies
12
Views
2K
Undergrad How can General Relativity explain the Moon drifting apart from Earth
  • · Replies 6 ·
Replies
6
Views
3K
Graduate Schwarzschild Derivation: Sean Carroll Notes - Theorem Name?
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Understanding Length Contraction: What is Limit of Vanishing Transport Velocity?
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Thermodynamics of Black Holes: Analyzing Carnot Cycles
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Are spherically symmetric and isotropic the same
  • · Replies 9 ·
Replies
9
Views
3K
Graduate Lense-Thirring effect - General Relativity
  • · Replies 12 ·
Replies
12
Views
3K
Graduate Constant along a geodesic vs covariantly constant
  • · Replies 3 ·
Replies
3
Views
2K
High School Light (not) escaping from black holes
  • · Replies 53 ·
2
Replies
53
Views
4K
High School Proving Proper Time of Photon in Friedman Metric
  • · Replies 2 ·
Replies
2
Views
1K
High School Time Travel & Causality in General Relativity
  • · Replies 30 ·
2
Replies
30
Views
4K
Undergrad FRW metric derivation: constraints from isotropic and homoge
  • · Replies 7 ·
Replies
7
Views
2K
High School Launch Spacecraft to Near c Speeds: Is it Possible?
  • · Replies 15 ·
Replies
15
Views
2K
High School If you condense an atom, would it make a black hole?
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Why Scalar Quantities Matter in Singularity Tests
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad Transforming to Local Inertial Coordinates
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad Demonstration of relation between geodesics and FLRW metric
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Mass of Bound Particles & Mass-Energy Equivalence
  • · Replies 9 ·
Replies
9
Views
2K
High School Relative speed and time dilation
  • · Replies 34 ·
2
Replies
34
Views
3K
High School How Does the Twin Paradox Affect Aging?
  • · Replies 44 ·
2
Replies
44
Views
7K
Undergrad Gravity Inside and Outside a Moving Lift
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad Angular Velocity: Can a Body Move Faster Than C?
  • · Replies 6 ·
Replies
6
Views
1K
Undergrad Communicating with Black Hole Time Warp: A to B and Back Again
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Is the Scientific American Article on the Twin Paradox Accurate?
  • · Replies 7 ·
Replies
7
Views
2K
High School Rest Frame in GTR: What Is It?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Inverse of infinitesimal Lorentz transformation
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Relativistic Energy Dispersion Relation: Explained
  • · Replies 10 ·
Replies
10
Views
3K
Undergrad Derivation of E=mc2 from Four-Vector Definitions in Special Relativity
  • · Replies 85 ·
3
Replies
85
Views
7K
High School Einstein's Lift Experiment: The Principle of Equivalence
  • · Replies 1 ·
Replies
1
Views
1K
Graduate The inverse of spacetime curvature?
  • · Replies 12 ·
Replies
12
Views
2K
Undergrad Feynman II, equation 26.11, off by a factor
  • · Replies 13 ·
Replies
13
Views
2K
Graduate Alcubierre Drive Direction: How Does Craft Move?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Space Contraction: Does Moving Frame Affect Observation?
  • · Replies 6 ·
Replies
6
Views
1K
Undergrad Contravariant first index, covariant on second, Vice versa?
  • · Replies 36 ·
2
Replies
36
Views
3K
Undergrad Using Black Holes to Time Travel Into the Future
  • · Replies 56 ·
2
Replies
56
Views
8K
High School Photons, mass, and black holes
  • · Replies 26 ·
Replies
26
Views
3K
High School Does Light Phase Change During Travel?
  • · Replies 14 ·
Replies
14
Views
2K
Undergrad Derivatives of EM Four-Potential: Euler-Lagrange to $\nabla \times B$
  • · Replies 3 ·
Replies
3
Views
1K
Graduate Is Gravity a Gauge Theory? A Review of GR and Standard Model Symmetries
  • · Replies 17 ·
Replies
17
Views
5K
Undergrad Derivation notation with capital D?
  • · Replies 5 ·
Replies
5
Views
4K
Undergrad Sum Maxwell Lagrangian 1st Term: Use Minus Signs?
  • · Replies 7 ·
Replies
7
Views
1K
Graduate Interpretation of covariant derivative of a vector field
  • · Replies 2 ·
Replies
2
Views
2K
High School Curvature: Intrinsic vs. Extrinsic - What's the Difference?
  • · Replies 9 ·
Replies
9
Views
4K
Undergrad Why do we need a theory to replace the Galilian composition of velocities?
  • · Replies 16 ·
Replies
16
Views
3K
Graduate Euler-Lagrange Equations: EM Field Term
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Measuring Space Curvature w/ Swarzschild Coordinate System: Q&A
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Lorenz Transformation of Time: Explained
  • · Replies 5 ·
Replies
5
Views
2K
Graduate SR/GRs Views on QM/QFT | Physics Forums
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Relativistic Effect on Object Accelerated to 10000-10000m/s^2
  • · Replies 7 ·
Replies
7
Views
1K
Undergrad Explaining Spacetime Dragging: Gravity, EM & Smooth Objects
  • · Replies 6 ·
Replies
6
Views
2K
High School Curvature of space vs. curvature of spacetime
  • · Replies 52 ·
2
Replies
52
Views
7K
Undergrad Deriving Divergence Formula in General Relativity
  • · Replies 4 ·
Replies
4
Views
4K
Graduate Solving Schwarzschild Field Equations in this Form
  • · Replies 3 ·
Replies
3
Views
1K
High School Inertial and gravitational mass
  • · Replies 28 ·
Replies
28
Views
3K
Undergrad General Relativity & The Sun: Does it Revolve Around Earth?
  • · Replies 193 ·
7
Replies
193
Views
16K
Undergrad Interstellar Travel Without Propulsion or Time Dilation
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad Is force/mass ratio an invariant quantity in GR?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Charged black hole - static electric field lines
  • · Replies 14 ·
Replies
14
Views
2K
Undergrad Parabolic Motion from Hyperbolic Motion
  • · Replies 2 ·
Replies
2
Views
1K
High School Can Electron-Positron Annihilation Reveal Insights About Black Hole Gravity?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Stress–energy pseudotensor of gravitation field for DE
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Difference Between Event Horizons & Trapped Surfaces - Explained Simply
  • · Replies 8 ·
Replies
8
Views
3K
Undergrad Sanity Check: Four-Force & Variable Mass
  • · Replies 13 ·
Replies
13
Views
2K
Graduate Improper and non-orthochronous group
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Can I be taught general and special Relativity on this forum
  • · Replies 70 ·
3
Replies
70
Views
6K
High School Light Clock Traveling in Z Direction
  • · Replies 9 ·
Replies
9
Views
2K
High School How can Closed Timelike Curves be made?
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Interior Schwarzschild Metric: Pressure Dependence
  • · Replies 6 ·
Replies
6
Views
2K
High School Another question about Gravity -- Does the apple attract the Earth?
  • · Replies 33 ·
2
Replies
33
Views
4K
High School How exactly does gravity work?
  • · Replies 81 ·
3
Replies
81
Views
10K
Undergrad Understanding Special & General Relativity: Inertial vs. Gravitational Frames
  • · Replies 15 ·
Replies
15
Views
2K
Undergrad Black Holes and Charged Particles
  • · Replies 38 ·
2
Replies
38
Views
6K
Graduate Gravitational Waves: Verification Accuracy & Physicists' Opinions
  • · Replies 1 ·
Replies
1
Views
1K
High School Hockey Puck Paradox: Will Antman Fly or Cruise?
  • · Replies 26 ·
Replies
26
Views
2K
Undergrad Confused About Lorentz Generators
  • · Replies 3 ·
Replies
3
Views
1K
High School Increase in PE due to increased mass
  • · Replies 23 ·
Replies
23
Views
3K
High School Einstein's curvature vs. Newton's
  • · Replies 22 ·
Replies
22
Views
3K
Undergrad Relativistic Calculus Books & PDFs | Free Resources
  • · Replies 11 ·
Replies
11
Views
2K
Graduate Why is Killing vector field normal to Killing horizon?
  • · Replies 19 ·
Replies
19
Views
4K
High School I cannot grasp simultaneity in Special Relativity
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad Do Black Holes Have Walls That Define Their Structure?
  • · Replies 5 ·
Replies
5
Views
1K
Graduate Strange Tetrad Form of Einstein-Hilbert Action
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad How much time dilation is there within a contracting remnant
  • · Replies 21 ·
Replies
21
Views
3K
Undergrad Can a Gravitational 'Gun' Accelerate Objects?
  • · Replies 10 ·
Replies
10
Views
2K
High School Addition of velocities at speeds near C - any differences?
  • · Replies 34 ·
2
Replies
34
Views
3K
High School Gravitational Wave Communication System
  • · Replies 3 ·
Replies
3
Views
2K
High School Speed of Light & Time Dilation: Travel Distance in 1 Sec?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Pseudotensors in different dimensions
  • · Replies 15 ·
Replies
15
Views
4K
Undergrad Vectors in Minkowski Space & Parity: Checking the Effect
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Is There a Proper Way to Define Energy in General Relativity?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Relativistic Particles: Reaching Absolute Temperature?
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad What Makes Ohanian's Approach to General Relativity Unique?
  • · Replies 18 ·
Replies
18
Views
2K
High School SR & GR: Circular Relationship?
  • · Replies 8 ·
Replies
8
Views
2K