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 Special Relativity: Comparing Lengths in Parallel Motion
- RohanJ
- · Replies 2 ·
Graduate Lorentz Transformation: Wave Equation vs. Interval Invariance
- jk22
- · Replies 7 ·
Undergrad Conservation of Energy Momentum Tensor
- kent davidge
- · Replies 3 ·
Undergrad Minkowski Metric: When to Use It
- qtm912
- · Replies 18 ·
Undergrad Predicting Local Arrival Time w/ Rocket Ship Clock & Accelerometer
- Bob Walance
- · Replies 11 ·
High School Can an object in every frame of reference have zero velocity?
- frankin garcia
- · Replies 24 ·
Undergrad Raising/Lowering Metric Indices: Explained
- WWCY
- · Replies 2 ·
Undergrad Architecture & Assumptions of General Relativity Theory
- Ad VanderVen
- · Replies 9 ·
Graduate Why does this term transform in this way?
- MichaelJ12
- · Replies 34 ·
High School How to understand 'covariance' and 'contravariance'
- chaksome
- · Replies 6 ·
High School Size of Bullet Hole: Comparing 0.000001c & .9c
- sqljunkey
- · Replies 6 ·
Undergrad What if a body loses 86,6% of its mass as couples of gamma photons?
- Alfredo Tifi
- · Replies 9 ·
Undergrad How specifically does an accelerated uniform rod Lorentz contract?
- {???}
- · Replies 55 ·
Undergrad Flux of i-momentum: Is it Correct?
- epovo
- · Replies 25 ·
Graduate Can Ricci Flow be Used in Lorentz Manifolds?
- wLw
- · Replies 2 ·
High School Landau's Derivation of Lorentz Transformations: Questions Answered
- Luke Tan
- · Replies 9 ·
Undergrad Time Dilation, Length Contraction & Massive Bodies
- Bracken
- · Replies 11 ·
Undergrad Gravitational wave interactions and the equivalence principle
- sf1001
- · Replies 17 ·
High School Length Contraction in Accelerated Frame
- sqljunkey
- · Replies 11 ·
Undergrad Electromagnetic Potentials in Relativity: Retarded Potentials?
- kent davidge
- · Replies 1 ·
High School Special case of relativistic velocity addition law
- IgorIGP
- · Replies 5 ·
Undergrad Lorentz transformation for 3 frames (2 dimensions)
- chaksome
- · Replies 19 ·
Undergrad Gravity as Curvature of Spacetime: Understanding Einstein's Theory
- EPR
- · Replies 7 ·
Graduate NASA hypothetical engine w/ relativistic ions
- BWV
- · Replies 26 ·
Undergrad Violations of Energy Conditions for Metric in Relativist's Toolkit
- Pencilvester
- · Replies 6 ·
Undergrad Connection between General Relativity & Chaos Theory?
- MyoPhilosopher
- · Replies 4 ·
Undergrad Christoffel's symbols: symmetry in the two (lower) indices
- member 11137
- · Replies 6 ·
High School What Would You See Inside a Black Hole? | General Relativity
- Randy Subers
- · Replies 2 ·
High School Red-Shifted Light: Speed Less Than C?
- james fairclear
- · Replies 11 ·
Undergrad Active Diffeomorphisms of Schwarzschild Metric
- Prathyush
- · Replies 6 ·
Graduate Numerically Solving Scalar Propagation in Curved Spacetime
- Tom O
- · Replies 1 ·
High School Why is the speed of light limited?
- Simtrad
- · Replies 8 ·
High School Understanding Spacetime Diagrams
- NoahsArk
- · Replies 37 ·
Undergrad Photon Speed Addition: Can it Be FTL?
- jk22
- · Replies 12 ·
High School Train traveling near light speed
- uniqueland
- · Replies 18 ·
Undergrad Does Moving a Wire Increase its Magnetic Field?
- jamesconnolly81
- · Replies 3 ·
Undergrad Energy-Momentum Tensor: How Much Do University Students Learn?
- kent davidge
- · Replies 3 ·
Undergrad Can Lagrangian mechanics be applied to motion in an expanding universe
- Buzz Bloom
- · Replies 22 ·
Undergrad Why Stationary Masses Attract: Explaining GR Intuition
- bryanso
- · Replies 9 ·
Undergrad The Equivalence Principle as a Starting point of GR
- fog37
- · Replies 44 ·
High School Relative Nature of Speed: Einstein and Orbits
- matternat968
- · Replies 7 ·
Undergrad How time dilation is a permanent change and length contraction not?
- AlephClo
- · Replies 13 ·
Undergrad Time travel to the Andromeda Galaxy
- Dnj23
- · Replies 17 ·
Undergrad Transformation of the Christoffel Symbols
- Luke Tan
- · Replies 4 ·
Undergrad Derivation of the conservation of total energy and momentum
- MathematicalPhysicist
- · Replies 5 ·
Undergrad Wiki definition of Fermi coordinates
- kent davidge
- · Replies 17 ·
High School How Can Photons Contribute Mass to a Container?
- PhyCurious
- · Replies 16 ·
High School Does Gravitational Time Dilation Affect How We Measure Time on Earth?
- PhDnotForMe
- · Replies 56 ·
Undergrad What is the ambiguity surrounding coordinate differentials in Relativity?
- dsaun777
- · Replies 13 ·
Undergrad Special relativity vs Lorentz invariance
- Demystifier
- · Replies 29 ·
Undergrad Parallel Transport: Uses & Benefits
- kent davidge
- · Replies 18 ·
Graduate Cooling of Identical Bodies in SR: A Peculiar Situation
- Pelion
- · Replies 24 ·
Undergrad Time Dilation: Relative to Medium or Vacuum?
- jk22
- · Replies 11 ·
Undergrad Metric compatibility and covariant derivative
- George Keeling
- · Replies 6 ·
Undergrad Derivation of an identity for ##\partial^2_t \int T^{00}(x^i x_i)^2d^3
- MathematicalPhysicist
- · Replies 6 ·
Insights Relativistic Treatment of the DC Conducting Straight Wire
- vanhees71
- · Replies 14 ·
Undergrad Aberration of Light in Circular Motion: Does Distance Change?
- Phylosopher
- · Replies 12 ·
High School Schwarzschild radius of an object is smaller than Planck length
- ColdheartedGod
- · Replies 3 ·
Undergrad The solution of a nonlinear equation in Schutz's book page 211 2nd edition
- MathematicalPhysicist
- · Replies 6 ·
Undergrad ADM Formalism: Intro-to-Intermediate Explanation
- DEvens
- · Replies 3 ·
Undergrad Time Dilation, Mass-Energy Equivalence: Implications for Time Passage
- PhyCurious
- · Replies 14 ·
Undergrad Speed of Light Paradox: Neutron Star Rotation Rate
- jflies
- · Replies 4 ·
High School The Strong Energy Condition in General Relativity
- Cerenkov
- · Replies 6 ·
Undergrad Observing a rotating body when approaching it at near light speed
- Meruem
- · Replies 8 ·
Undergrad Coordinate time between spatially separated events in Schwarzschild spacetime
- physlosopher
- · Replies 58 ·
High School Why does matter always escape while antimatter falls into black holes?
- fairtrax
- · Replies 14 ·
Undergrad Max Time Travel Date: Can We Enjoy Moments From the Past?
- kent davidge
- · Replies 1 ·
Graduate Theoretical status of hypothesized Generic Objects of Dark Energy
- PeterDonis
- · Replies 6 ·
Undergrad Inertial Mass as Speedometer: Physics & Universe
- metiman
- · Replies 17 ·
Undergrad How big are the non-mass parts of the stress-energy tensor?
- ohwilleke
- · Replies 21 ·
High School GR & Early Universe: Time Dilation & Light Speed
- Juan Carlos del Rio
- · Replies 5 ·
Graduate Einstein Tensor and Stress Energy Tensor of Scalar Field
- Phinrich
- · Replies 4 ·
Undergrad The Shape of Space: How Does It Move?
- ddjj77
- · Replies 7 ·
Undergrad Get Standard Units Flux Multiply c^2: Perfect Fluid/Einstein's Dust
- dsaun777
- · Replies 6 ·
Undergrad Invariants of the stress energy tensor
- Dale
- · Replies 9 ·
Undergrad QFT of Gravitons in Minkowski Space vs GR
- ohwilleke
- · Replies 12 ·
Undergrad Light Speed Mirror Reflection: Can You See Yourself?
- gsouum
- · Replies 2 ·
High School Are Gravity and Magnetism Curving Space in Similar Ways?
- AshPowers
- · Replies 10 ·
Undergrad Derivation of Riemann tensor's first order-equation
- MathematicalPhysicist
- · Replies 1 ·
Undergrad Covariant Derivative: 2nd Diff - My Question
- Kisok
- · Replies 1 ·
High School Relative Dead Stop in Deep Space
- bland
- · Replies 8 ·
Undergrad Godel metric in a cylindrical chart
- space-time
- · Replies 38 ·
Undergrad Special Relativity: 2-D Collisions for Alice & Bob
- MrBlank
- · Replies 3 ·
Undergrad Two rings rotating about a common center
- JD_PM
- · Replies 9 ·
Undergrad Accel. in Spec. Relativity in 2-Dims: Point Test Mass
- MrBlank
- · Replies 7 ·
High School Light & Gravity: Impact on Spacetime?
- mgkii
- · Replies 3 ·
Graduate Einstein and Spacetime: Debunking the Myth of Rejecting Curvature
- joelr315
- · Replies 10 ·
Undergrad Length Contraction & FTL Speeds: Are Lower Grades Faster?
- Maximum7
- · Replies 5 ·
Undergrad Understanding Light from Black Holes
- kelly0303
- · Replies 7 ·
Undergrad Lorentz transformation for 3 frames
- arnau
- · Replies 7 ·
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 Relationship between mass and energy
- 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 ·