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
High School How to intuitively understand the formula S² = x² - c²t²
- PhysicsEnjoyer31415
- · Replies 7 ·
Undergrad Why isn't TT gauge over constrained?
- ergospherical
- · Replies 7 ·
Undergrad Minkowski to Euclidean line element from coordinate changes?
- Pencilvester
- · Replies 5 ·
Graduate Diffeo-invariant action for a matter covector field
- ergospherical
- · Replies 1 ·
Undergrad Final part of proof of timelike Killing w/ Frobenius --> static
- ergospherical
- · Replies 1 ·
Undergrad Einstein field equations
- PhysicsEnjoyer31415
- · Replies 5 ·
Undergrad Online Christoffel Symbols Calculator
- Dhananjhay
- · Replies 7 ·
High School Question about bendability of objects in 4 dimensions
- ESponge2000
- · Replies 57 ·
Undergrad A question about Relativity of Time using Time dilation experiment
- rahaverhma
- · Replies 12 ·
Undergrad On the existence of Gravitational energy in General relativity
- KleinMoretti
- · Replies 6 ·
Undergrad Null energy condition constrains the metric
- ergospherical
- · Replies 5 ·
Undergrad SR flat Lorentzian manifold and Anderson simultaneity convention
- cianfa72
- · Replies 16 ·
Undergrad The generators of a ``Poincare-type'' group in momentum space
- redtree
- · Replies 29 ·
Undergrad Understanding Spacetime simultaneity in twin paradox scenarios
- ESponge2000
- · Replies 35 ·
Undergrad Construct a Diagram that Illustrates The Galilean Law of Addition of Velocities
- Math Amateur
- · Replies 7 ·
Undergrad Standing light waves if the one-way speed of light were not constant?
- greypilgrim
- · Replies 36 ·
Undergrad Evaporating black hole: First principles consideration
- Tomas Vencl
- · Replies 1 ·
High School Falling into a black hole
- martix
- · Replies 43 ·
Undergrad Pullback & orthogonal projector
- ergospherical
- · Replies 2 ·
Undergrad Unruh Radiation and Black Holes
- sbrothy
- · Replies 10 ·
High School Is velocity the reason for the time dilation effect?
- Mike_bb
- · Replies 55 ·
Undergrad What Would the Universe Look Like as a Manifold with Boundary?
- DDTG
- · Replies 2 ·
Undergrad How to get metric field using a path dependent parallel propagator
- Jianbing_Shao
- · Replies 24 ·
Undergrad What are Killing vectors?
- snoopies622
- · Replies 15 ·
Undergrad Is this a Killing vector field?
- ergospherical
- · Replies 1 ·
Undergrad Which theory of time is the most evidence-based?
- curiosity1
- · Replies 32 ·
High School Implications of negative Michelson-Morley result
- cianfa72
- · Replies 12 ·
Graduate Variation of CMFR mass density ##\rho## along a world line
- Kostik
- · Replies 17 ·
Undergrad Time dilation from galactic gravitational mass
- marcosdb
- · Replies 49 ·
High School Detection of red-shifted photons near an event horizon
- Grinkle
- · Replies 7 ·
Undergrad Is time dilation a real effect?
- cianfa72
- · Replies 54 ·
Undergrad Falling through the event horizon of an evaporating black hole
- brooknorton1
- · Replies 51 ·
High School Mass defect and electron transition
- sandeepts
- · Replies 3 ·
Graduate Synchronous to Newtonian gauge
- ergospherical
- · Replies 1 ·
Undergrad A. P. French "Matter and Radiation: The Inertia of Energy"
- Math Amateur
- · Replies 4 ·
High School Excellent Free Course On Einsten, Relativity, His Views Etc from Harvard
- bhobba
- · Replies 1 ·
Undergrad Killing fields commute if they are asymptotically coordinate?
- ergospherical
- · Replies 7 ·
Undergrad Meaning of the invariants built from the angular momentum tensor
- SiennaTheGr8
- · Replies 1 ·
Undergrad Conservation of stress-energy tensor
- KleinMoretti
- · Replies 19 ·
Undergrad Can the expansion of the Universe reduce the energy of a photon to 0?
- DaveBeal
- · Replies 29 ·
High School The relationship between mc^2 and mc^2 x 1/2
- thetexan
- · Replies 16 ·
Graduate Boundary conditions in ##\delta I=0## to derive Einstein's equations
- Kostik
- · Replies 8 ·
Undergrad Orbital Period In General Relativity
- dsaun777
- · Replies 3 ·
Undergrad Strange index notation for linear transformation matrix
- sphyrch
- · Replies 4 ·
Undergrad Israel Junction Conditions: Finding Continuous Metric Across Shell
- Onyx
- · Replies 20 ·
Undergrad Dark energy and conservation of energy
- KleinMoretti
- · Replies 4 ·
Undergrad On the physical meaning of Minkowski's spacetime model
- cianfa72
- · Replies 40 ·
Undergrad Why Does a Charged Box Exhibit Higher Inertia Due to Mass-Energy Equivalence?
- andreabalestrero
- · Replies 3 ·
High School Why is it impossible to go faster than the speed of light?
- davidortenn79
- · Replies 21 ·
Undergrad Linearised gravity approach to Lense Thirring metric
- ergospherical
- · Replies 7 ·
Graduate Retarded time and advanced time (and binning)
- complexconjugate
- · Replies 3 ·
Undergrad Black Holes Colliding Exactly Head On
- peanutaxis
- · Replies 2 ·
Graduate What does Dirac mean by "the suffixes would not balance"?
- Kostik
- · Replies 13 ·
Graduate How do we interpret measurements of Mercury's position?
- djanni_unchained
- · Replies 11 ·
Graduate Dirac comment on tensor densities (Dirac GTR, p. 37)
- Kostik
- · Replies 3 ·
Undergrad Transition of spherically symmetric gravitation
- Imya
- · Replies 3 ·
Graduate Dirac's coordinates ##(\tau, \rho)## for the Schwarzschild metric with ##r \le 2m##
- Kostik
- · Replies 5 ·
Graduate Variation of the kinetic term in scalar field theory
- Baela
- · Replies 1 ·
High School Do observers always agree on the number of waves in a beam of light?
- Herbascious J
- · Replies 12 ·
Undergrad Questions about Hawking radiation and extremal black holes...?
- Suekdccia
- · Replies 4 ·
Undergrad Coordinate Transformation versus Change of Synchrony Convention
- GeneSnider
- · Replies 9 ·
High School Help understanding the Relativity of Simultaneity
- Chenkel
- · Replies 36 ·
High School Entering a black hole -- I know I must be wrong (Help me understand why)
- Somoth Ergai
- · Replies 29 ·
Undergrad Einstein brother-in-law elevator
- member 728827
- · Replies 11 ·
Undergrad Bell's spaceship paradox
- Renato Iraldi
- · Replies 16 ·
Undergrad Ricci tensor from this action
- ergospherical
- · Replies 4 ·
Undergrad How Relativistic Speeds Affect Time Perception on a Spaceship
- jj65854
- · Replies 18 ·
High School How are 'fringe shifts' in the Michelson-Morley experiment calculated?
- DrBanana
- · Replies 9 ·
Undergrad Explanation for Galaxy Rotation Curves
- sha1000
- · Replies 12 ·
Undergrad One difference between GR and quantum mechanics
- sphyrch
- · Replies 10 ·
Undergrad Move Stress-Energy tensor to the left side of EFE?
- Fractal matter
- · Replies 2 ·
Undergrad Would moving the mouths of a wormhole affect the internal distance?
- Earthworm69
- · Replies 3 ·
Undergrad Photon in a mirrored box moving in direction of travel
- Herbascious J
- · Replies 26 ·
High School Energy loss of a photon
- kymner
- · Replies 1 ·
Undergrad Battery life on VERY fast moving object
- davidjoe
- · Replies 128 ·
High School Time and right angle traveling twins paradox
- KojoMott
- · Replies 25 ·
Undergrad A problem in the equations for Einstein's Special Theory of Relativity
- robertwinn
- · Replies 8 ·
Undergrad What is the fabric of space-time made up of?
- Shourya Tripathi
- · Replies 11 ·
Undergrad Does the speed of light pop out of other theories than EM?
- greypilgrim
- · Replies 16 ·
Undergrad Why are rotated parallel axes still parallel?
- unified
- · Replies 5 ·
High School Prove that metric tensor is covariant constant
- lerus
- · Replies 11 ·
Undergrad How relative is the magnetic field of a current carrying conductor?
- lonely penguin
- · Replies 4 ·
Undergrad The answer for the total mass of the Universe?
- WeirdUniverse
- · Replies 36 ·
Graduate Movement vs expansion in space
- exander
- · Replies 49 ·
Undergrad Does potential energy curve spacetime?
- Leureka
- · Replies 28 ·
Undergrad Relativity of Simultaneity and Length Contraction
- curiousburke
- · Replies 54 ·
Graduate Why ##A_{\nu:\sigma}=0## in flat space?
- Kostik
- · Replies 19 ·
Undergrad Mathematical problem with Schwarzschild spacetime?
- Bosko
- · Replies 26 ·
High School Gravitational potential energy, a thought experiment
- Lok
- · Replies 125 ·
High School New Paradox Discovered, I Think
- Somoth Ergai
- · Replies 98 ·
Undergrad Dirac comment on covariant derivatives
- Kostik
- · Replies 7 ·
Undergrad Deriving the relativistic rocket equation with exhaust efficiency
- halcyon_zomboid
- · Replies 1 ·
Undergrad Lorentz Transformations Confusion
- laser
- · Replies 14 ·
High School Does the age of the Universe differ for observers in expanding space?
- mister i
- · Replies 19 ·
Undergrad Newton Galilean spacetime as fiber bundle
- cianfa72
- · Replies 29 ·
Graduate Coupling torsion to electromagnetism and torsion tensor decomposition
- nicopa
- · Replies 5 ·
Undergrad Galaxy recession and Universe expansion
- cianfa72
- · Replies 90 ·
Undergrad Is momentum conserved as a body falls through a gravitational field?
- Herbascious J
- · Replies 35 ·
Undergrad Does Kerr's argument against singularities apply to all black holes?
- Suekdccia
- · Replies 12 ·
Undergrad Doppler and Searchlight (Headlight)
- Albertgauss
- · Replies 21 ·