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 S5-HVS1: 10x Slower Relative Time?
- jal
- · Replies 1 ·
High School Do quantum mechanics and relativity describe the same phenomena?
- darrenjb
- · Replies 16 ·
Undergrad Basic questions about raising and lowering indices
- olgerm
- · Replies 39 ·
Undergrad Solving Differential Equations in General Relativity
- Jianbing_Shao
- · Replies 1 ·
Undergrad Summation Convention in Einstein Notation
- olgerm
- · Replies 7 ·
High School Elasticity of Spacetime: Does Spacetime Stiffen?
- sqljunkey
- · Replies 7 ·
High School How Does LIGO Detect Gravitational Waves Despite Changes in Spacetime?
- asca
- · Replies 67 ·
High School Why is the speed of light the constant in E=mc²?
- jnorman34
- · Replies 8 ·
Graduate Derivatives of Lagrangian Terms: Why We Lower?
- TroyElliott
- · Replies 6 ·
Undergrad Difference between Christoffel symbols of the first and second kind
- olgerm
- · Replies 24 ·
Undergrad What happens when rods moving parallel compare their lengths?
- 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 in rotating frames and with gravitational fields
- qtm912
- · Replies 18 ·
Undergrad Can a rocket predict Earth time at arrival using only its clock and accelerometer?
- Bob Walance
- · Replies 11 ·
High School Can an object in every frame of reference have zero velocity?
- frankin garcia
- · Replies 24 ·
Undergrad Raising and lowering indices with metric perturbations
- WWCY
- · Replies 2 ·
Undergrad What is the architecture and assumptions of general relativity?
- 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 Which bullet creates a larger hole at 0.000001c versus 0.9c
- 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 Gravitational time dilation and length contraction near massive objects
- 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 Can distant events causally influence each other in general relativity?
- MyoPhilosopher
- · Replies 4 ·
Undergrad Why do articles define torsion from asymmetric Christoffel symbols?
- member 11137
- · Replies 6 ·
High School What would you see looking outward from inside a black hole's event horizon?
- Randy Subers
- · Replies 2 ·
High School Does redshift mean light travels slower 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 Orthogonal speed addition for photons in special relativity
- 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 do stationary masses attract each other in curved spacetime?
- 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 What is parallel transport useful for in relativity?
- kent davidge
- · Replies 18 ·
Graduate Why do identical plates cool at the same rate despite different surface areas in S'?
- Pelion
- · Replies 24 ·
Undergrad Does time dilation depend on light speed in a 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 Why does light travel distance change in circular motion aberration?
- 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 Does time exist objectively or only as subjective observer experience?
- 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 Can inertial mass changes measure velocity in relativity?
- metiman
- · Replies 17 ·
Undergrad How big are the non-mass parts of the stress-energy tensor?
- ohwilleke
- · Replies 21 ·
High School Did time run slower in the early universe due to gravity?
- 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 If you're traveling at light speed toward a mirror, 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 Do collisions appear to happen in different frames in special relativity?
- 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 Does light curve spacetime like matter does?
- mgkii
- · Replies 3 ·
Graduate What did Einstein mean by rejecting the geometrical description of spacetime?
- joelr315
- · Replies 10 ·
Undergrad Why is the lower class hyperdrive faster in Star Wars lore?
- Maximum7
- · Replies 5 ·
Undergrad Understanding Light from Black Holes
- kelly0303
- · Replies 7 ·
Undergrad Lorentz transformation for 3 frames
- arnau
- · Replies 7 ·