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.
I Einstein's 1935 Paper on Wormholes & Modern Physics
  • · Replies 2 ·
Replies
2
Views
2K
I Special Relativity: 3 Objects, Momentum & Time Dilation
  • · Replies 4 ·
Replies
4
Views
1K
I What tests can falsify general relativity?
  • · Replies 118 ·
4
Replies
118
Views
10K
I Why binary systems for gravitational waves?
  • · Replies 15 ·
Replies
15
Views
2K
I Is Scale Factor a Scalar? Sean Carroll Invitation
  • · Replies 12 ·
Replies
12
Views
2K
I Can the Spacetime Interval at a Singularity Change Our Understanding of Time?
  • · Replies 9 ·
Replies
9
Views
1K
I Correcting General Relativity Effect on Atomic Time
  • · Replies 12 ·
Replies
12
Views
1K
B Velocity Addn Paradox: SR Postulate Explained
  • · Replies 11 ·
Replies
11
Views
2K
B What Happens When Light Approaches a Black Hole?
  • · Replies 2 ·
Replies
2
Views
1K
Why Is Time Dilation Considered a Real Phenomenon?
  • · Replies 61 ·
3
Replies
61
Views
5K
I Is Heart Rate Invariant in Different States of Motion?
  • · Replies 4 ·
Replies
4
Views
1K
I Space - time and the illusion of time
  • · Replies 14 ·
Replies
14
Views
2K
I Cross Product in E_u: Explaining Gourgoulhon's Text
  • · Replies 4 ·
Replies
4
Views
2K
A GBAR Experiment (CERN) - Genève
  • · Replies 31 ·
2
Replies
31
Views
2K
B Understanding the Stress-Energy Tensor & Solar Mass in General Relativity
  • · Replies 14 ·
Replies
14
Views
2K
I Doppler effect - can't imagine how the frequency of light can change
  • · Replies 9 ·
Replies
9
Views
2K
B Is this explanation of gravity under General Relativity legit?
  • · Replies 23 ·
Replies
23
Views
3K
I General Relativity: Angular Momentum, Gravity & Questions
  • · Replies 7 ·
Replies
7
Views
2K
B Light Speed Invariance: Experiments, Difficulties & Clarification
  • · Replies 33 ·
2
Replies
33
Views
3K
Possible to publish a paper that contradicts Einstein's special relativity?
  • · Replies 82 ·
3
Replies
82
Views
7K
B Speed of Light: Questions Answered
  • · Replies 8 ·
Replies
8
Views
1K
I Speed of light not an invariant in GR
  • · Replies 105 ·
4
Replies
105
Views
8K
I What do physicists mean by "local degrees of freedom"?
  • · Replies 11 ·
Replies
11
Views
3K
B What Links High Velocities, Strong Gravitational Fields, and Time Dilation?
  • · Replies 11 ·
Replies
11
Views
2K
B Interested in Black Holes, Neutron Stars, and White Dwarf Stars
  • · Replies 39 ·
2
Replies
39
Views
3K
I General relativity, Electromagnetism and Feynman Diagrams
  • · Replies 1 ·
Replies
1
Views
1K
A Gravitomagnetism: Derivation, Theory & Insights - Bill
  • · Replies 3 ·
Replies
3
Views
1K
I Does rotation in Gödel spacetime depend on the frame of reference?
  • · Replies 31 ·
2
Replies
31
Views
3K
A What Does a Zero Metric Mean in the Context of Pre-Big Bang Physics?
  • · Replies 8 ·
Replies
8
Views
1K
B Do photons travel instantaneously?
  • · Replies 41 ·
2
Replies
41
Views
5K
I Coincidence of FLWR & CBR Homogeneity: Earth @ 0.0013c?
  • · Replies 4 ·
Replies
4
Views
1K
I Is acceleration absolute or relative - revisited
  • · Replies 185 ·
7
Replies
185
Views
10K
A Obtain Normal Vector of Bubble Wall in Spacetime
  • · Replies 2 ·
Replies
2
Views
1K
I Why was Schrodinger's equation for the relativistic wave unsuccessful?
  • · Replies 1 ·
Replies
1
Views
710
I Does string theory falsify the theory of special relativity?
  • · Replies 19 ·
Replies
19
Views
3K
I Crossing Event Horizon: Physics of Disintegration?
  • · Replies 13 ·
Replies
13
Views
2K
B Metric tensor for a uniformly accelerated observer
  • · Replies 55 ·
2
Replies
55
Views
5K
I Speed of Light in Different Mediums: Exploring Maxwell Equations
  • · Replies 7 ·
Replies
7
Views
2K
I Derivation of E=pc & E=MC2: Which Came First?
  • · Replies 67 ·
3
Replies
67
Views
8K
I Calculating Distance Light Travels Near a Black Hole
  • · Replies 12 ·
Replies
12
Views
2K
I Understanding Relativity: How Moving Objects Experience Near Light Speed Travel
  • · Replies 83 ·
3
Replies
83
Views
6K
I Decompose SL(2C) Matrix: Real Parameters from Complex
  • · Replies 5 ·
Replies
5
Views
2K
I Explore Coordinate Dependent Statements in Orodruin's Insight
  • · Replies 5 ·
Replies
5
Views
1K
A Is There a Unified Theory Between General Relativity and Electromagnetism?
  • · Replies 4 ·
Replies
4
Views
1K
I Equations of Spacetime Invariant - Understanding the Difference
  • · Replies 4 ·
Replies
4
Views
1K
I Gravitational Waves Emitted by a Binary System
  • · Replies 24 ·
Replies
24
Views
2K
I Solving GR 2-Body Problem with Summ. of Christoffel Symbols
  • · Replies 12 ·
Replies
12
Views
2K
I Would circumnavigating the Universe allow one way measurement of light's speed?
  • · Replies 69 ·
3
Replies
69
Views
4K
B Energy Conservation in Relativity: Perpetual Motion?
  • · Replies 11 ·
Replies
11
Views
2K
B Redshifted Photon Emission vs Transport: Magnitude of Gravitational Redshift
  • · Replies 10 ·
Replies
10
Views
2K
I How Do Dual Vectors Differ From Regular Vectors in Physics?
  • · Replies 35 ·
2
Replies
35
Views
6K
I Klein-Gordon: Schwarzschild Metric, Physically Acceptable?
  • · Replies 7 ·
Replies
7
Views
2K
I Is the premise of the Michelson–Morley argument still valid?
  • · Replies 31 ·
2
Replies
31
Views
3K
I Interpretation of Potential Energy as Field Property
  • · Replies 5 ·
Replies
5
Views
2K
I Compute EOM for Spin Connection from Einstein-Palatini Action
  • · Replies 1 ·
Replies
1
Views
1K
I Calculating Time Dilation & Galaxy Rotation Curve
  • · Replies 7 ·
Replies
7
Views
2K
I Solving the Flickering Light Paradox
  • · Replies 20 ·
Replies
20
Views
2K
I Compute Gradient in GR: Step-by-Step Guide
  • · Replies 3 ·
Replies
3
Views
1K
I Source of Gravity of heavy mass as per GTR
  • · Replies 14 ·
Replies
14
Views
2K
B What Happens When Light Meets Matter in the Universe?
  • · Replies 17 ·
Replies
17
Views
2K
I Gravity on Earth: Basic Qs Answered by Physicists
  • · Replies 8 ·
Replies
8
Views
1K
I Movement of a guitar string at relativistic speeds
  • · Replies 61 ·
3
Replies
61
Views
5K
A The "no metric, no nothing" view
  • · Replies 2 ·
Replies
2
Views
1K
I Can Time Travel Into the Future Really Happen?
  • · Replies 19 ·
Replies
19
Views
2K
I 4 spaceships are pulling a membrane through an asteroid belt
  • · Replies 8 ·
Replies
8
Views
1K
B Why do you need a light clock?
  • · Replies 7 ·
Replies
7
Views
2K
B Comparing Rates: Why Don't Units Cancel?
  • · Replies 24 ·
Replies
24
Views
2K
I What is the four-momentum of a photon?
  • · Replies 17 ·
Replies
17
Views
3K
I GTR & STR: Could 9 Dimensions Unify Theory?
  • · Replies 6 ·
Replies
6
Views
1K
B Measuring the One Way Speed of Light
  • · Replies 171 ·
6
Replies
171
Views
13K
B On the four dimensions of special relativity
  • · Replies 22 ·
Replies
22
Views
2K
B Understanding the Relationship Between c and c2 in the Famous Formula e = mc2
  • · Replies 8 ·
Replies
8
Views
2K
I Cosmic Censorship: Does it Hold?
  • · Replies 2 ·
Replies
2
Views
2K
A Understanding Kerr Black Holes: Metric, Killing Vectors & Event Horizons
  • · Replies 8 ·
Replies
8
Views
4K
A Temp of Moving Body: 110 Yrs of Debate | Current Tech Update?
  • · Replies 20 ·
Replies
20
Views
2K
B Explaining Spaghettification w/ Spacetime Curvature
  • · Replies 25 ·
Replies
25
Views
3K
I What is the Role of Matter in General Relativity's Lagrangian?
  • · Replies 10 ·
Replies
10
Views
2K
A Understanding Tensor Notation: What is the Difference?
  • · Replies 16 ·
Replies
16
Views
3K
I Relativistic Velocity, Perp. Accel., Momentum: Explained
  • · Replies 6 ·
Replies
6
Views
2K
B A few questions about the covariant derivative
  • · Replies 7 ·
Replies
7
Views
3K
I Gravity: Compounded Space (Time) Signal?
  • · Replies 5 ·
Replies
5
Views
2K
A Geodesic Eq Derived from Einstein Field Equations?
  • · Replies 25 ·
Replies
25
Views
3K
I Conservation of energy in general relativity
  • · Replies 42 ·
2
Replies
42
Views
6K
I Recovering Newton's energy conservation law for an Earth's lab
  • · Replies 35 ·
2
Replies
35
Views
3K
I Is coordinate speed affected by gravitational waves?
  • · Replies 17 ·
Replies
17
Views
3K
I Hawking Radiation: Info vs Semanticity? - Hossenfelder
  • · Replies 4 ·
Replies
4
Views
2K
A The g_ij as potentials for the gravitational field
  • · Replies 108 ·
4
Replies
108
Views
9K
I The Sub Photon Sphere Escape Game
  • · Replies 8 ·
Replies
8
Views
1K
I Unravelling the Mysteries of the Kerr Black Hole Ergosphere
  • · Replies 19 ·
Replies
19
Views
2K
I Radius Excess of Curvature in Relativity: Explained
  • · Replies 6 ·
Replies
6
Views
2K
B Understanding the active/passive transformation of a scalar field
  • · Replies 15 ·
Replies
15
Views
4K
B Light Clock: Why Aren't Delta T and 2D/c Equal?
  • · Replies 17 ·
Replies
17
Views
2K
I Investigating The Photon Sphere
  • · Replies 3 ·
Replies
3
Views
2K
I Solving Relativistic Inelastic Collisions: 150 GeV Energy
  • · Replies 8 ·
Replies
8
Views
2K
B Transforming the Electric Field Measured by an Observer with 4-velocity U
  • · Replies 2 ·
Replies
2
Views
1K
I Solving the Spherically Symmetric Einstein Equation
  • · Replies 3 ·
Replies
3
Views
1K
B Gravitational Wave System and Locations
  • · Replies 2 ·
Replies
2
Views
2K
B Who Won the 2020 Nobel Prize in Physics and What Did They Discover?
  • · Replies 48 ·
2
Replies
48
Views
9K
B Value of this 'Science' Channel as quick intro
  • · Replies 38 ·
2
Replies
38
Views
4K
I Observing Black Holes in Finite Time
  • · Replies 10 ·
Replies
10
Views
2K