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 Does accelerating expansion contradict a constant cosmological constant?
- mertcan
- · Replies 4 ·
Undergrad Space and time as fields of mass-energy
- The Count
- · Replies 8 ·
Graduate Subtraction of Christoffel symbol
- mertcan
- · Replies 8 ·
Undergrad Field equations fully written out
- greypilgrim
- · Replies 3 ·
Undergrad GR vs SR: Is a Connection Necessary?
- greypilgrim
- · Replies 5 ·
Undergrad Consequences of length contraction
- Vidar Martinsen
- · Replies 18 ·
Undergrad Gravitational potential energy and rest mass
- e2m2a
- · Replies 19 ·
Undergrad Time dilation in relativistic Doppler effect
- DarthVader
- · Replies 21 ·
High School Energy required to change speed?
- Jeronimus
- · Replies 5 ·
Graduate Are Killing Horizon and Stationary Limit Surface the same?
- Elnur Hajiyev
- · Replies 30 ·
High School How to simply solve for E=MC^2?
- Zarich12
- · Replies 13 ·
Graduate Why Do Torsion Tensor Derivations Differ Between Sources?
- mertcan
- · Replies 29 ·
High School Does acceleration propagate at light speed cause length contraction?
- Maartenc
- · Replies 14 ·
Undergrad Calculating Radius and Mass of Disc for Velocity 0.75C
- KaleLetendre
- · Replies 9 ·
Graduate Anti-symmetric Christoffel symbol
- mertcan
- · Replies 6 ·
Graduate Interpretation of the EM tensor as a rotation matrix
- dahemar4
- · Replies 8 ·
High School Virtual Particle Speed: Is It Measurable?
- Maartenc
- · Replies 3 ·
Graduate Curvature tensor in all flat space coordinates
- mertcan
- · Replies 4 ·
High School Error in Einstein's Lorentz transformation formula derivation
- StandardsGuy
- · Replies 11 ·
High School Rod falling radially towards the center of a mass
- timmdeeg
- · Replies 58 ·
Undergrad Is the universe a larger version of a black hole?
- Jim Stanley
- · Replies 2 ·
High School Can gravitational wave escape a black hole
- kodama
- · Replies 12 ·
Undergrad Why is MOND more complicated than a simple curve fit to gravity?
- exmarine
- · Replies 4 ·
Undergrad Metric Conservation Law in 2D Spacetime
- Rococo
- · Replies 2 ·
Undergrad Do Distant Planets Move Faster Than Light Seen From Earth?
- Machu
- · Replies 8 ·
Graduate Scalar boundary conditions that preserve U(1) isometry in BTZ
- craigthone
- · Replies 1 ·
High School Can a Spaceship Use a Planet's Gravity Like a Treadmill?
- LM542
- · Replies 2 ·
Graduate What is the coordinate free stress-energy-momentum tensor
- brombo
- · Replies 6 ·
Undergrad Velocity of Timelike Curve in Special Relativity
- JonnyG
- · Replies 3 ·
Undergrad Clarifying Equivalence Principle
- Android Neox
- · Replies 18 ·
Graduate Field of Moving Masses: EM Purcell
- Supantho Raxit
- · Replies 4 ·
Undergrad Taylor and Wheeler's Spacetime Physics (1st Edition)
- Junaid Aftab
- · Replies 4 ·
High School If light exists outside of time, how do we experience it?
- EinsteinFan
- · Replies 29 ·
Graduate Was the LIGO team over-hasty to claim black holes confirmed?
- MaxWallis
- · Replies 4 ·
Undergrad Morin's Rocket Example: Chapter 12, Page 606
- almarpa
- · Replies 8 ·
High School Why do gravitational waves propagate at the speed of light?
- KarminValso1724
- · Replies 4 ·
Graduate Why evaluate the exponential map at λ=1
- guitarphysics
- · Replies 3 ·
High School Sign convention for relative velocity between approaching observers
- Jeronimus
- · Replies 10 ·
High School Kinetic Energy Dependent on Frame of Reference?
- UMath1
- · Replies 4 ·
High School Black Hole SHM: Gravitational Force
- JTFreitas
- · Replies 3 ·
Undergrad Show 4-Potential is 4-Vector in Lorenz Gauge
- majinbeeb
- · Replies 3 ·
Graduate Least Action Principle Applied to Vector Field ##A_{\mu}##
- yancey
- · Replies 3 ·
Undergrad Speed of light or Speed limit of Spacetime?
- ebos
- · Replies 18 ·
High School Time travel with tachyons cause infinite dilemma?
- Cameron MacGillivray
- · Replies 10 ·
Undergrad Communicating at Near-Light Speed - Time Dilation
- SF Alba
- · Replies 5 ·
Undergrad Motivation for the usage of 4-vectors in special relativity
- Frank Castle
- · Replies 32 ·
Undergrad Is motion through space or spacetime?
- Frank Castle
- · Replies 45 ·
High School Could information travel faster than C
- victorhugo
- · Replies 8 ·
Undergrad Are the Lorentz transformation formulas on wikipedia correct?
- Jeronimus
- · Replies 45 ·
Undergrad Does non-gravitational acceleration produce waves?
- EnumaElish
- · Replies 9 ·
High School How does relativity impact our everyday lives beyond GPS and nuclear energy?
- Stephanus
- · Replies 14 ·
High School Can a black hole event horizon grow at the speed of light?
- Gigel
- · Replies 50 ·
Undergrad Gravitational time dilation over 186,000 miles and gauge invariance in orbital energy
- Karl Coryat
- · Replies 3 ·
Undergrad Why does general relativity use the same gravitational constant as Newton's theory?
- Zak
- · Replies 3 ·
Graduate Can the weak equivalence principle hold if particles rotate in a gravitational field?
- spaghetti3451
- · Replies 29 ·
Undergrad What does it mean that energy is locally never negative?
- Cosmology2015
- · Replies 7 ·
High School Does space contraction regard the moving body or the path?
- alba
- · Replies 7 ·
Graduate Relativistic orbital precession in practice
- silencjum
- · Replies 24 ·
Graduate Why are there three different notations for the momentum 4-vector?
- PAK108
- · Replies 13 ·
Undergrad Gravitational wave energy flux from two masses on a spring
- Devin
- · Replies 18 ·
Graduate Covariant derivative definition in Wald
- JonnyG
- · Replies 33 ·
Undergrad Proper mapping of the second postulate into math
- Jeronimus
- · Replies 14 ·
Undergrad Does motion through time in curved spacetime couple to spatial motion?
- ibkev
- · Replies 16 ·
Undergrad Why Can't Lorentz Boosts be Used for Length Contraction?
- Afterthought
- · Replies 11 ·
High School Magnetic field at relativistic speed
- alba
- · Replies 44 ·
Undergrad Spacetime Changes vs Matter Location Inside
- ibkev
- · Replies 6 ·
Undergrad What is Planck curvature and its significance in the expansion of the universe?
- kini.Amith
- · Replies 1 ·
High School Is the Universe discrete or continuous?
- ProfuselyQuarky
- · Replies 12 ·
Graduate How to show γ0S[Λ]^-1γ0 equals the Dirac adjoint spinor transformation
- nigelscott
- · Replies 5 ·
High School Newtonian vs Relativistic Mechanics
- Grimble
- · Replies 139 ·
Graduate Investigations into a heuristic Lagrangian of graviton field
- spaghetti3451
- · Replies 4 ·
Undergrad Event Horizon of Telescope Through Earth: Does It Exist?
- Tantal
- · Replies 1 ·
High School Golf Ball in Flat Space-Time: Return or Shift?
- Davephaelon
- · Replies 6 ·
Undergrad Implications of Relative Simultaneity: Carl & Shirley's Observations
- Approximation
- · Replies 15 ·
High School Can light travel vertically in one frame and diagonally in another?
- Stephanus
- · Replies 12 ·
Undergrad Clock Thought Exp: A Light-Year Time Paradox
- ZawL
- · Replies 2 ·
Undergrad Are Special Relativity effects valid for angular velocity?
- Lohan
- · Replies 14 ·
High School What Is Negative Energy and How Does It Affect the Universe?
- Stephen Brackin
- · Replies 12 ·
Graduate GWs energy and aLIGO detection
- RockyMarciano
- · Replies 31 ·
Undergrad Parametrisation of timelike curves using proper time
- Frank Castle
- · Replies 15 ·
Graduate Do black holes lose hair in finite time?
- haael
- · Replies 16 ·
High School Does a moving sphere contract in volume due to length contraction?
- Einstein's Cat
- · Replies 11 ·
Undergrad Is Maxwellian Gravitoelectromagnetism a useful analogy?
- greswd
- · Replies 21 ·
High School What does the third term signify in series development?
- Vishwas K S
- · Replies 4 ·
Insights Roger Babson's Anti-Gravity Contest - Comments
- klotza
- · Replies 7 ·
Undergrad Why p⁰ = E/c from the zeroth 4-momentum component
- Frank Castle
- · Replies 8 ·
High School Do All Black Holes Have the Same Density?
- EnumaElish
- · Replies 5 ·
Undergrad (How) does the LIGO experiment falsify Newtonian gravity?
- EnumaElish
- · Replies 14 ·
High School Why does the returning spacecraft not take less time than the outgoing leg?
- faramund
- · Replies 3 ·
Undergrad How Are Gravitational Waves Connected to Black Holes?
- leo.
- · Replies 4 ·
High School Space-Time: Does it Follow Newton's Third Law?
- Nihad Nazmul
- · Replies 1 ·
Undergrad Mass to Energy Transformation for ordinary Chemical reaction
- Dr. Who
- · Replies 8 ·
Undergrad Uncharged Particle near Charged Mass
- DarthVader
- · Replies 2 ·
Undergrad Breakthrough Starshot: 1st Macroscopic Test of Longitudinal Acceleration
- greswd
- · Replies 5 ·
Insights A Geometrical View of Time Dilation and the Twin Paradox - Comments
- Orodruin
- · Replies 35 ·
High School How can we tell that "fictitious forces" are not real?
- Comradez
- · Replies 29 ·
Undergrad What is general relativity all about?
- LSMOG
- · Replies 3 ·
High School What are Lorentz factors?
- Fuinne
- · Replies 6 ·
Undergrad My lecturer says "Special relativity is absolutely wrong"
- Seanra
- · Replies 104 ·
High School Can normal force allow escape from inside a black hole's event horizon?
- livethere
- · Replies 3 ·