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.
Threads
Undergrad How to See How Two Frames are Connected?
- kent davidge
- · Replies 8 ·
Undergrad Playing music with Gravitational waves
- Xforce
- · Replies 10 ·
Undergrad Lie derivative of hypersurface basis vectors along geodesic congruence
- Pencilvester
- · Replies 15 ·
Undergrad Light pulse path, length and shape, when bouncing between two mirrors
- fog37
- · Replies 34 ·
High School Rest mass vs inertial mass and energy in special relativity
- fog37
- · Replies 9 ·
Undergrad Find CTCs in Kerr Metric: Visualizing Spacetime Geometry
- space-time
- · Replies 8 ·
Undergrad Lorentz transformation of derivative and vector field
- doggydan42
- · Replies 7 ·
Undergrad Light Momentum - Does it Make Sense or Not?
- bob012345
- · Replies 10 ·
Graduate Alcubierre Warp Drive: Intro Paper for GR Students
- DEvens
- · Replies 2 ·
Undergrad A "space elevator" extended to Neptune's orbit
- Dnj23
- · Replies 19 ·
Undergrad Why Does the Angle Between Coordinate Axes in Different Frames Equal atan(v/c)?
- olgerm
- · Replies 66 ·
Undergrad Position of Particle in Special Relativity (A vs B)
- adosar
- · Replies 7 ·
High School Julius Caesar Problem from a SpaceTime Physics book
- NoahsArk
- · Replies 50 ·
Undergrad Can we increase an object's gravitational force by adding energy?
- jms4
- · Replies 23 ·
Undergrad Pullback of Vector Field in Relativity: Restrictions?
- Pencilvester
- · Replies 2 ·
Graduate Derive Radial Momentum Eq. in Kerr Geometry
- abby11
- · Replies 1 ·
Undergrad Appearance of a Kerr black hole from above
- Creedence
- · Replies 20 ·
High School What happens to speed and velocity in a rotating frame of reference?
- somega
- · Replies 29 ·
High School Reference frame symmetry in Special Relativity
- x-vision
- · Replies 35 ·
Undergrad Energy Momentum Tensor Prerequisites: What Do I Need to Know?
- kent davidge
- · Replies 5 ·
Undergrad Mechanical system with de Broglie-like features
- AVentura
- · Replies 25 ·
Graduate Relativistic Hoop w/ Constant Circumference: Solving Egan's Results
- pervect
- · Replies 5 ·
Undergrad Lorentz transformation of coordinates at t=0
- Newton-reborn
- · Replies 5 ·
High School Where did the 1/2 go in E=mc^2?
- DaveC426913
- · Replies 124 ·
High School Is Gravity Really a Force Like the Other Fundamental Forces?
- Happiness
- · Replies 12 ·
High School Proof of Specific Covariant Divergence
- gerald V
- · Replies 2 ·
High School Special Theory of Relativity: Ques on Thought Experiment
- Visair1
- · Replies 5 ·
High School Does a photon experience time dilation to zero?
- member 342489
- · Replies 6 ·
Graduate Applying General Lorentz Boost to Multipartite Quantum State
- Emil_M
- · Replies 2 ·
Undergrad Is relativity complete in its mathematical formulation?
- kent davidge
- · Replies 6 ·
Undergrad Relativistic energy and angular momentum of a rotating ring
- AVentura
- · Replies 13 ·
Graduate Why does MTW keep calling the "product rule" the "chain rule"?
- FreeThinking
- · Replies 42 ·
Graduate Derivation of the Vacuum Einstein Equations: Understanding ln det g = 1
- PGaccount
- · Replies 8 ·
Undergrad Problems with Einstein's 1920 "Relativity"
- bengoodspeed
- · Replies 58 ·
Undergrad Is the Lorentz Boost Speed Nontrivially Related to Galilean Speed?
- jk22
- · Replies 10 ·
High School But in reality, time isn't relative at all, right?
- GuillemVS
- · Replies 20 ·
Graduate Issue with the definition of a Lie derivative and its components (Carroll's GR)
- haushofer
- · Replies 14 ·
Undergrad How does gravity affect time on different planets?
- EasterEggs123
- · Replies 4 ·
Undergrad Succeed in Learning Relativity: Transport, Frames, Tensors
- kent davidge
- · Replies 9 ·
Undergrad How do you derive those basis vectors in GR?
- space-time
- · Replies 14 ·
Undergrad Can a constantly accelerating observer receive light signals from all points?
- kent davidge
- · Replies 17 ·
Undergrad Relativity of Simultaneity: What Einstein's Contribution Was
- e.chaniotakis
- · Replies 4 ·
Undergrad Okay, what exactly makes a timelike curve closed?
- space-time
- · Replies 18 ·
Undergrad Three dimensional tracefree tensor?
- Pencilvester
- · Replies 4 ·
High School What would the universe look like if it collapsed into a black hole?
- black hole 123
- · Replies 15 ·
Undergrad On the Relativity of Lengths and Times
- pheurton
- · Replies 14 ·
Undergrad Applying the spacetime interval to regular vectors instead of curves
- space-time
- · Replies 2 ·
High School Can a rod partly dipped in a supermassive black hole's event horizon stay intact?
- black hole 123
- · Replies 9 ·
Graduate Einstein, Mach's Principle, and the Speed of Light Limit
- e2m2a
- · Replies 28 ·
Undergrad Velocity u > c? Faster Than Light Comm?
- f todd baker
- · Replies 7 ·
Graduate Only Three People Understand General Relativity
- bhobba
- · Replies 24 ·
Undergrad Proper (and coordinate) times re the Twin paradox
- Grimble
- · Replies 330 ·
Undergrad Duration of a round-trip to Alpha Centauri
- Warp
- · Replies 21 ·
Undergrad Locally Cartesian Coordinates on the Sphere
- kent davidge
- · Replies 10 ·
High School Dark Matter -- Could dark matter be standard matter from the past?
- ryanbeem
- · Replies 14 ·
Undergrad Would two apples 10 billion light years apart attract each other gravitationally?
- zuz
- · Replies 24 ·
Graduate Can Time Travel Teleportation Be Achieved with Computer Bytes and Radio Signals?
- AIO
- · Replies 2 ·
Graduate When and Why Was the Definition of the Meter Changed?
- pervect
- · Replies 101 ·
Undergrad Understanding Boosts in Misner Space: Where Do They Come From?
- space-time
- · Replies 6 ·
High School Difficulty with derivatives using the Lorentz transformations
- etotheipi
- · Replies 10 ·
High School Does Local Gravity Override Dark Matter in Galactic Rotation?
- Viopia
- · Replies 35 ·
Undergrad Best argument for why Lorentz transformations must be linear?
- kent davidge
- · Replies 5 ·
Graduate Time Dilation in Gravitational Fields: Are Equivalent Formulas?
- Emmacastellano80
- · Replies 2 ·
High School Lightyear Distance: Understand Its Impact
- Mickeydee
- · Replies 9 ·
Undergrad Apply Conservation Law to Euler-Lagrange Equation
- space-time
- · Replies 4 ·
Undergrad What do light cones look like in Rindler coordinates?
- kent davidge
- · Replies 6 ·
Undergrad Headlight Effect of Moving Light Source: Formula
- Hiero
- · Replies 3 ·
High School Physics near the event horizon
- Staticboson
- · Replies 39 ·
Undergrad Why doesn't the geodesic conservation law equal -1 in Minkowski space?
- space-time
- · Replies 10 ·
Undergrad Shouldn't a moving clock appear to be ticking faster instead of slower?
- Mentospech
- · Replies 71 ·
Undergrad Do Rindler coordinates really cover a quadrant of Minkowski space?
- kent davidge
- · Replies 4 ·
High School Is Gravity Truly a Force According to Relativity?
- kfielder
- · Replies 29 ·
Undergrad Solving Geodesic Equations with Godel Metric
- space-time
- · Replies 4 ·
Undergrad Can off-diagonal terms in the Minkowski metric preserve light speed invariance?
- kent davidge
- · Replies 34 ·
Undergrad Curved Space-Time: Understanding How Nothing Has Shape
- bcl
- · Replies 29 ·
High School Finding the length of a metre stick from a moving frame of reference
- etotheipi
- · Replies 9 ·
Undergrad Visualizing intrinsic curvature without embeddings
- MatthijsRog
- · Replies 6 ·
Undergrad Bernard Schutz Proves Invariance of Interval
- kmm
- · Replies 6 ·
Undergrad Why are CTCs geodesics in Godel universes but not in Minkowski space?
- space-time
- · Replies 7 ·
High School Is Time a Real and Material Concept?
- thinkandmull
- · Replies 16 ·
High School Nonlinear transformations that keep the wave equation invariant
- jk22
- · Replies 1 ·
High School Possibility of Black Hole research
- Marshall_Mathers
- · Replies 51 ·
Undergrad Can a satellite escape a black hole if hit by another mass inside?
- Creedence
- · Replies 11 ·
High School Why does only one observer measure proper time if motion is relative?
- adosar
- · Replies 13 ·
Graduate Critique of Non-Interaction Theorem: Meaning & Validity
- andresB
- · Replies 3 ·
Undergrad Is a circle at constant t and z a closed spacelike curve in Godel spacetime?
- space-time
- · Replies 5 ·
High School Finding Flaws in General Relativity: A Question of Knowledge
- cordless03
- · Replies 4 ·
Undergrad Difference between the Lorentz metric and the Minkowski metric
- kent davidge
- · Replies 5 ·
Undergrad What is the physical cause behind time dilation?
- Jazzyrohan
- · Replies 41 ·
Graduate Synchrotron Radiation: Charge Loss of Relativistic Particles in Magnetic Fields
- Alfredo Tifi
- · Replies 9 ·
High School Confusion over relative velocities and reference frames
- etotheipi
- · Replies 5 ·
Undergrad Does G effectively change in an expanding metric?
- jcap
- · Replies 15 ·
High School Does simultaneity depend on signals traveling at light speed?
- DeltaForce
- · Replies 3 ·
Graduate Global solutions to Einstein equations beyond symmetric perturbations
- Heikki Tuuri
- · Replies 3 ·
High School Does faster-than-light travel actually enable time travel?
- MikeeMiracle
- · Replies 28 ·
Undergrad How can the stress tensor be non-zero where there is no matter?
- SamRoss
- · Replies 42 ·
High School Resources for learning Lorentz transformations and Minkowski diagrams
- DeltaForce
- · Replies 7 ·
Undergrad Time dilation and length contraction at 99.9% light speed: 50,000 years vs 1 day
- drkfuture
- · Replies 16 ·
Graduate Black Hole Eating Gravitational Waves - A Look at Physics
- .Scott
- · Replies 14 ·
High School Questions about Einstein and the Block Universe
- Quantum Alchemy
- · Replies 1 ·