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 Scenario allowing a signal to travel at superluminous speeds?
- TheGoodDoctor
- · Replies 1 ·
Graduate Gravity and acceleration near to the speed of light
- Smarky
- · Replies 2 ·
High School Sorry if this is too basic but we've all got to start somewhere
- Ink Monitor
- · Replies 4 ·
Undergrad What exactly is Einstein's famous E = MC^2
- shadae758
- · Replies 2 ·
Graduate What is the equation that determines the speed of light "c"?
- thecow99
- · Replies 2 ·
Graduate Why do these two terms cancel in the Riemann-Christoffel tensor?
- Legion81
- · Replies 3 ·
High School General Relativity & Newton's Gravity - the fit?
- C_Dawg
- · Replies 5 ·
Graduate What does observer B see in the train thought experiment?
- Jerbearrrrrr
- · Replies 2 ·
Graduate Lorentz Transformation: R_2=R_1^{-1}?
- facenian
- · Replies 2 ·
Graduate Cosmological expansion question
- Invinoveritas
- · Replies 4 ·
Graduate BRS: Using Maxima for gtr computations
- Chris Hillman
- · Replies 6 ·
High School How to describe the 4th dimension?
- Rico L
- · Replies 17 ·
Graduate Can Time Move Faster in Low Gravity Fields?
- matdoya
- · Replies 4 ·
Graduate Divergence of curvature scalars * metric
- JustinLevy
- · Replies 40 ·
Graduate Normalization of 4-velocity in general relativity
- jmlaniel
- · Replies 32 ·
Graduate Why no privlidged reference frame?
- JDługosz
- · Replies 13 ·
Graduate Diagonalizing Rank 2 Symmetric Tensors in 4D Spacetime
- JustinLevy
- · Replies 4 ·
Graduate Partial derivatives as basis vectors?
- Rearden
- · Replies 6 ·
Graduate Why hyperbolic geometry in spacetime if it is flat?
- closet mathemetician
- · Replies 7 ·
Graduate Mercury Precession & GR Calculation Impact
- zincshow
- · Replies 38 ·
Graduate Wave equation and Galilean Transformation
- Advent
- · Replies 9 ·
Undergrad Why is E=pc with Light's Zero Rest Mass?
- Grim Shady
- · Replies 10 ·
Graduate Is a Curve Timelike, Spacelike, or Null?
- wglmb
- · Replies 2 ·
High School What Does Relative Really Mean and How Is It Used?
- Jadaav
- · Replies 8 ·
Graduate What is the Composition of Spacetime?
- ZirkMan
- · Replies 42 ·
Graduate Other universes vs Hawking radiation
- resaypi
- · Replies 1 ·
Graduate Why do Lorentz boosts use hyperbolic functions instead of trig functions?
- fys iks!
- · Replies 5 ·
Graduate Warp Space Travel: Is the Light Always Ahead?
- qwerty1
- · Replies 2 ·
Graduate Gravity & Charge: Explained by Maxwell's Eqs?
- GRDixon
- · Replies 7 ·
Undergrad Do All Wavelengths of the EM Spectrum Have Photons?
- qwerty1
- · Replies 3 ·
Graduate Is Simultaneity Absolute or Relative in Einstein's Theory of Relativity?
- stevmg
- · Replies 12 ·
Graduate Gravitational redshift equation
- Zman
- · Replies 5 ·
Graduate Energy into matter conversion possible?
- Moviemann345
- · Replies 6 ·
Graduate Testing the Equivalence Principle with Spectral Anisotropies
- HarryWertM
- · Replies 2 ·
Graduate Unifying Gravity and Electromagnetism: Refuting Einstein's Attempts
- Ontophile
- · Replies 12 ·
Graduate General Relativity Revisited (What if gravity actully is a force?)
- shanesworld
- · Replies 53 ·
Graduate Accelerating frames and black holes
- Iamu
- · Replies 3 ·
High School Explaining Time Dilation: A Simple Guide
- binbots
- · Replies 8 ·
Graduate Diffeomorphism invariance of metric determinant
- Pacopag
- · Replies 5 ·
Graduate Cosmological Redshift: Why Does k Remain the Same?
- karlzr
- · Replies 1 ·
Graduate Spinning Super Fluids: Reach Relativistic Speeds?
- AKatawazi
- · Replies 5 ·
Graduate Equivalent Trajectories in Relativity: Observer Effects
- jaketodd
- · Replies 1 ·
Graduate Vectors in Special Relativity
- facenian
- · Replies 4 ·
Graduate What is the four-momentum of a photon and its associated four-velocity?
- protonchain
- · Replies 10 ·
Graduate How does General Relativity explain the orbit of a planet around a star?
- HarryWertM
- · Replies 4 ·
Graduate Rod shortening - physical reality?
- Pierre007080
- · Replies 22 ·
Graduate Is the Time Coordinate Timelike or Spacelike?
- vertices
- · Replies 5 ·
Graduate Is D'Inverno's Equation (11.38) Correctly Integrated?
- TerryW
- · Replies 4 ·
Graduate Deriving Ernst's Equation for Complex Metrics
- paweld
- · Replies 1 ·
Graduate Twin paradox and length contraction
- resaypi
- · Replies 5 ·
Undergrad Time dilation in relation to earth time
- anoose101
- · Replies 1 ·
Graduate Can GR Explain the Expansion of the Universe Through Curvature of Spacetime?
- TrickyDicky
- · Replies 2 ·
Graduate Is Spacetime Like Whales Displacing Water in an Ocean?
- joshk2718
- · Replies 4 ·
Graduate Can Time Travel Reveal Tasks Before Completion?
- mgsully
- · Replies 2 ·
Graduate Simultaneity & seeing the same event multiple times.
- tabarnard
- · Replies 21 ·
Graduate Clarifying the relativity theory
- ribod
- · Replies 1 ·
Graduate Would light reach the earth in this scenario?
- polaris12
- · Replies 8 ·
Graduate What Does the Right Hand Side of the Equation Refer To in OEMB Section 3?
- JulianM
- · Replies 18 ·
Undergrad Is the Speed of Light Really Constant in a Vacuum?
- Pierre007080
- · Replies 2 ·
Graduate Deriving the Schwarzschild metric just by using the equivalence principle
- Huashan
- · Replies 6 ·
Graduate Variational principle for geodesics with affine parameters
- madness
- · Replies 11 ·
Graduate Can gravity exist without mass?
- JinChang
- · Replies 65 ·
Graduate What is relativistic mass and rest mass
- Rico L
- · Replies 5 ·
Graduate Axis Alignment in Einstein's 1905 Paper: Symmetry Impact
- jason12345
- · Replies 5 ·
Graduate Metric outside a spherically symmetric source.
- elect_eng
- · Replies 11 ·
Undergrad Understanding the Massless Photon
- Lelan Thara
- · Replies 47 ·
Undergrad Single Body Gravitation in a Universe with Only One Planetary Body
- nDever
- · Replies 2 ·
Graduate The Eternal Question of Inertia
- e2m2a
- · Replies 3 ·
Graduate What is the Force Formulation of Dark Energy?
- particlemania
- · Replies 1 ·
Graduate Understanding Relativistic Energy Equations: Are They Linear?
- jaketodd
- · Replies 2 ·
Graduate Is a Magnet Losing Mass by Emitting Virtual Photons?
- Ballon
- · Replies 16 ·
Graduate Does energy alone contribute to spacetime curvature?
- e2m2a
- · Replies 5 ·
Graduate Is the Frame Dragging Effect Measurable on High-RPM Massive Rotating Discs?
- Simonomis
- · Replies 4 ·
Graduate Special Theory of Relativity Incorrect?
- iaberrant
- · Replies 23 ·
Graduate What Do Traversable Wormholes Look Like in Visual Renderings?
- Artlav
- · Replies 2 ·
Graduate Speed of light for accelerated frames
- neyzenilhan
- · Replies 4 ·
Graduate How Does Acceleration Affect the Relativistic Mass of Particles?
- cos
- · Replies 77 ·
Undergrad E2 - p2c2 = m2c4 - Meaning of symbols
- particlemania
- · Replies 31 ·
Graduate Why is the stress-energy tensor divergenceless from its definition?
- JustinLevy
- · Replies 1 ·
Graduate Why can't a constantly accelerating rocket exceed the speed of light?
- RexxXII
- · Replies 48 ·
Graduate Relativistic Force, Energy & Momentum: Does Force Also Apply?
- astro2cosmos
- · Replies 1 ·
Graduate Does length contraction result from time dilation?
- teodorakis
- · Replies 2 ·
Graduate Solving Anisotropy of Swartzchild Metric: Entropy, Temperature at Infinity
- utesfan100
- · Replies 21 ·
Graduate Curvature of Space-Time: Understanding Bing Bang & f(t)
- alejandrito29
- · Replies 1 ·
Graduate Energy variance, and pair production
- Matterwave
- · Replies 3 ·
Graduate Does relativistic mass create gravity?
- eNathan
- · Replies 21 ·
Graduate Photon in time versus photon not so much-ish in time
- Sublite
- · Replies 1 ·
Graduate M. Frame: Invariant Mass Confinement < c Motion
- Sublite
- · Replies 2 ·
High School Very simple relativity questions
- Pagey
- · Replies 42 ·
Graduate Riemann tensor and flat spacetime
- Ranku
- · Replies 2 ·
Graduate Invarients from the Faraday tensor
- peterjaybee
- · Replies 3 ·
Graduate What are tetrads and the spin connection
- RedX
- · Replies 14 ·
Graduate Lorentz invariance of action derivation
- snoopies622
- · Replies 3 ·
Graduate Einstein again +, on large scale.
- yoda jedi
- · Replies 6 ·
Graduate Very simple thought experiment re: time dilation
- tabarnard
- · Replies 15 ·
Graduate A basic question in general relativity
- David_cronin
- · Replies 3 ·
Undergrad Why is the speed of light squared in E=mc², and does a train's mass square at light speed?
- LT72884
- · Replies 10 ·
Graduate How can time dialation cause gravity?
- Paul77
- · Replies 20 ·
Graduate Debunking Time Travel Speculations: The Truth Behind Going Back in Time
- sciencectn
- · Replies 20 ·
Graduate Experimental measurement of Einstein's Field Equations
- JustinLevy
- · Replies 16 ·