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 Reduced density matrices and Lorentz transformation
  • · Replies 1 ·
Replies
1
Views
5K
Graduate What is a Rank 3 Tensor and Why Does It Matter?
  • · Replies 16 ·
Replies
16
Views
8K
Undergrad The beautiful sight of the interstellar traveller
  • · Replies 8 ·
Replies
8
Views
3K
Graduate Does the presence of B change the velocity of C with respect to A?
  • · Replies 6 ·
Replies
6
Views
5K
Graduate Is Proper Time Invariance Proven?
  • · Replies 3 ·
Replies
3
Views
5K
Graduate Can't get time dilation to add up
  • · Replies 11 ·
Replies
11
Views
3K
Graduate Is the behavior of light that remarkable?
  • · Replies 26 ·
Replies
26
Views
5K
Graduate What are some potential topics for a FAQ on the Twin Paradox?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate What is time? Is it an imaginary thing?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Einstein field equations (EFE's)
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Theories of relativity and the resulting E = MC^2
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Neutron Stars and Special Relativity
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad Traveling at Near-Light Speed: Time Dilation and Your Perspective Explained
  • · Replies 11 ·
Replies
11
Views
4K
Graduate The Photon's Perspective Taboo
  • · Replies 45 ·
2
Replies
45
Views
14K
Graduate Send Particle Backwards in Time - Is this a hoax?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Relativistic Mass and Energy Convservation
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Do Gravity Waves and Light Waves Follow the Same Paths in Space-Time?
  • · Replies 7 ·
Replies
7
Views
4K
Undergrad How Can a Simple Laser Pointer Cause Destruction at Light Speed?
  • · Replies 25 ·
Replies
25
Views
6K
High School Tracing the Passage of Time: Is It Possible?
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Most basic of thought experiments in special relativity
  • · Replies 21 ·
Replies
21
Views
5K
Graduate Large Scale Structure of Spacetime Study Group
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Solving Tricky Pauli Matrices with Einstein Notation
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Is Time Variable When Light is Constant?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate How does light slow in the presence of gravity?
  • · Replies 56 ·
2
Replies
56
Views
9K
Undergrad Superman and Time Travel: Is It Possible?
  • · Replies 28 ·
Replies
28
Views
10K
Undergrad Confused in a thought-experiment
  • · Replies 12 ·
Replies
12
Views
3K
Undergrad Why do we need to see gravitation as force?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Need help understanding an equation
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Can Time Exist Without Mass or Energy in Space?
  • · Replies 10 ·
Replies
10
Views
2K
Graduate Question about SR and increasing mass
  • · Replies 6 ·
Replies
6
Views
2K
High School So, sorry for asking a stupid question.What causes Time to Move?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Are proper travel distances contracted by SR?
  • · Replies 14 ·
Replies
14
Views
3K
Graduate Kinetic Energy & Relativity: E=mc^2
  • · Replies 2 ·
Replies
2
Views
1K
High School Mass + potential kinetic energy
  • · Replies 8 ·
Replies
8
Views
3K
High School Teaching 7th Graders About Black Holes
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Spacetime Translational Invariance vs(?) Lorentz Covariance
  • · Replies 1 ·
Replies
1
Views
5K
Undergrad Doppler Effect on Light: Understanding Red and Blue Shifts in Galaxies
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Feynman's perihelion of mercury calculation using field theory
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Hawking radiation: why only one way?
  • · Replies 20 ·
Replies
20
Views
6K
Graduate How Do You Calculate a 2D Null Geodesic in the Presence of a Gravitational Mass?
  • · Replies 1 ·
Replies
1
Views
3K
Undergrad Weightless in a Shielded Room: Does Gravity Still Apply?
  • · Replies 46 ·
2
Replies
46
Views
8K
Graduate Close to light speed visualization question
  • · Replies 9 ·
Replies
9
Views
4K
Graduate What Distinguishes a Free-Falling Frame from a Fermi-Walker Frame?
  • · Replies 1 ·
Replies
1
Views
2K
History of Gravity: A Brief Overview from Antiquity to 20th Century
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Interpretation of spacetime diagrams.
  • · Replies 8 ·
Replies
8
Views
3K
Graduate How fast to go 1000 years into the future
  • · Replies 11 ·
Replies
11
Views
7K
Undergrad Beginner's question on bending of space time and measuring distance to stars
  • · Replies 9 ·
Replies
9
Views
4K
Graduate DeBroglie and Time Dilation Paradox
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Axxis Movement: Lorentz Transformation
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Questions on Gravity: Wavelength, Frequency, Effects
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Does spacetime curvature of EM field affect zero-charge particles?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Can Time Travel Create Paradoxes?
  • · Replies 13 ·
Replies
13
Views
4K
Graduate Gravitational waves adn Black holes frequency
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Who Truly Experiences Slower Time in the Paradox of Time Dilation?
  • · Replies 175 ·
6
Replies
175
Views
22K
Undergrad What is the Relationship Between Speed of Light and Time?
  • · Replies 15 ·
Replies
15
Views
4K
Graduate Quantum Gravity: Reconciling General Relativity & QFT
  • · Replies 10 ·
Replies
10
Views
3K
Undergrad I was wondering why Einstein picked C for this equation.
  • · Replies 14 ·
Replies
14
Views
3K
Graduate Relativity of distances/lengths
  • · Replies 1 ·
Replies
1
Views
2K
Graduate What is the difference between proper time and coordinate time in relativity?
  • · Replies 12 ·
Replies
12
Views
4K
Graduate Using a computer to calculate Einstein tensor etc.
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Solving Matrix Equations in SL(2,C) for Arbitrary Vectors
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Understanding de Sitter Space: FRW or Hyperboloid?
  • · Replies 3 ·
Replies
3
Views
4K
Undergrad How do you prove that the speed of light is absolute
  • · Replies 13 ·
Replies
13
Views
9K
Graduate Is there a Space-Time Curvature equation?
  • · Replies 15 ·
Replies
15
Views
11K
Graduate Pauli-Fiertz Lagrangian: Book Recommendation
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Are Einstein's and Newton's Laws of Physics in Conflict?
  • · Replies 21 ·
Replies
21
Views
4K
High School How Can We Reach the Speed of Light?
  • · Replies 26 ·
Replies
26
Views
6K
Graduate Leonard Susskind: General Relativity
  • · Replies 6 ·
Replies
6
Views
16K
Graduate Gradients in the curvature of space-time
  • · Replies 5 ·
Replies
5
Views
5K
Graduate What is the correct definition of energy in relativistic systems?
  • · Replies 3 ·
Replies
3
Views
9K
Graduate Coupled nonlinear partial differential equations or simple matrices?
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad Gravity Waves: Speed & Possible Outcomes
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Is It Possible to Reach the Speed of Light with a Spacecraft?
  • · Replies 9 ·
Replies
9
Views
3K
Graduate Polarization Vectors: Momentum & Helicity Explained
  • · Replies 2 ·
Replies
2
Views
6K
Graduate What would it actually look like?
  • · Replies 11 ·
Replies
11
Views
3K
Graduate Will our sun become black hole if it were moving fast enough?
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Alternative way of looking at simultaneity is 1
  • · Replies 24 ·
Replies
24
Views
5K
Graduate Can Closed Timelike Curves Enable Real Time Travel?
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Gravitational Path of an Object
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Can photons create their own gravity?
  • · Replies 29 ·
Replies
29
Views
7K
Undergrad Speed of Light Always The Same?
  • · Replies 32 ·
2
Replies
32
Views
11K
Undergrad A BRIEF HISTORY OF TIME, question
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Understanding Causal Set Theory and Its Implications for the Universe
  • · Replies 6 ·
Replies
6
Views
4K
Graduate Special relativity and Earth in context to a stationary point
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Our light cone was a black hole
  • · Replies 12 ·
Replies
12
Views
5K
Graduate Twin Paradox- a quick(ish) question
  • · Replies 53 ·
2
Replies
53
Views
10K
Graduate Zero connection => Zero torsion tensor ?
  • · Replies 11 ·
Replies
11
Views
5K
Graduate Calculating Time Elapsed in Circling Spaceship
  • · Replies 7 ·
Replies
7
Views
2K
Graduate Gravitational redshift and black holes
  • · Replies 2 ·
Replies
2
Views
4K
Graduate Are black holes bosons or fermions?
  • · Replies 21 ·
Replies
21
Views
8K
Graduate Does a black hole have shape?
  • · Replies 18 ·
Replies
18
Views
5K
Graduate Red shift occurs when gravity is at 90*
  • · Replies 23 ·
Replies
23
Views
6K
Graduate Can we predict which reference frame is correct?
  • · Replies 14 ·
Replies
14
Views
3K
Graduate 1st Law of Black Hole Mechanics
  • · Replies 1 ·
Replies
1
Views
2K
High School Nasa speaks of the either the space shuttle or the ISS
  • · Replies 6 ·
Replies
6
Views
3K
Graduate What Causes the Shapiro Time Delay in Radar Signals?
  • · Replies 42 ·
2
Replies
42
Views
22K
Graduate Gravity question: Why do things fall?
  • · Replies 7 ·
Replies
7
Views
5K
Graduate Is the 4-velocity always a space-tipe 4-vector?
  • · Replies 22 ·
Replies
22
Views
4K
Undergrad Acceleration and twin paradox question
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Thought experiment in relativity of simultaneity
  • · Replies 18 ·
Replies
18
Views
11K