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
Graduate What time passes for observers at different speeds due to time dilation?
- notadoctor
- · Replies 5 ·
Graduate Einstein Velocity Addition for Relative Speed Calculation
- Quarlep
- · Replies 5 ·
Graduate Time Travel Possibility: Scottish Scientists Slow Light Speed?
- Auliter
- · Replies 8 ·
Graduate Relativistic Definition of Energy: E=Fd or E=md2/t2?
- mrspeedybob
- · Replies 3 ·
Graduate Asymptotic velocity under constant force?
- Timothy S
- · Replies 26 ·
Graduate Why does the second line follow from the first in covariant Maxwell equations?
- jennyjones
- · Replies 3 ·
Graduate How do you calculate time dilation near a massive object?
- carcosachild
- · Replies 1 ·
Graduate Is Mass Equivalence Explained by the Relationship Between Energy and Gravity?
- maline
- · Replies 21 ·
Graduate Is energy conserved in general relativity?
- Dadface
- · Replies 76 ·
Graduate How to Determine Frame Size with Lorentz Transformation
- genxium
- · Replies 4 ·
Graduate A problem regarding time dilation
- THE HARLEQUIN
- · Replies 3 ·
Graduate Solving Einstein's Field Equation: The Schwarschild Metric & Beyond
- TimeRip496
- · Replies 3 ·
Undergrad How do we determine who is moving in the twin paradox?
- delsaber8
- · Replies 4 ·
Graduate Can the CMB be used as a reference for absolute motion?
- bland
- · Replies 14 ·
Graduate S DILEMMA: Time Dilation in Simple Harmonic Motion?
- THE HARLEQUIN
- · Replies 9 ·
Graduate The co-moving frame - acceleration, momentum and velocity
- Drew Carey
- · Replies 4 ·
Graduate Time dilation why or how, Special Relativity causes
- Einstein Devotee
- · Replies 95 ·
Graduate Who is accelerating: the falling person or the stationary observer?
- David Carroll
- · Replies 142 ·
Graduate Why does a(t) factor preserve homogeneity in the FRW metric?
- binbagsss
- · Replies 1 ·
Graduate Massive Object Paradox: Traveling Near Speed of Light?
- em370
- · Replies 1 ·
Graduate Why does parallel transport mean the covariant derivative vanishes?
- "Don't panic!"
- · Replies 1 ·
Graduate Understand Electromagnetic Force in Different Inertial Frames
- MathewsMD
- · Replies 7 ·
Graduate General Relativity: Manifold/Sub-Manifold Metric Theorem Q-Schwarzschild
- binbagsss
- · Replies 4 ·
Graduate What do free indices mean in four-vector notation?
- rwooduk
- · Replies 11 ·
Graduate Deriving Geodetic Line by Einstein: Clarifying Difficulties
- sujoykroy
- · Replies 2 ·
Graduate When can a metric be put in diagonal form?
- binbagsss
- · Replies 12 ·
High School Does light revolve around mass like the moon orbits the Earth?
- TimeRip496
- · Replies 9 ·
Graduate Signature, boundary conditions and topology
- lucas_
- · Replies 7 ·
Undergrad Relative velocity time dilation question
- Canadian09
- · Replies 13 ·
Graduate A plane shoots a bullet -- energy at different frame?
- lemd
- · Replies 6 ·
Undergrad Does gravity affect a magnetic/electric field?
- PWiz
- · Replies 4 ·
Graduate Ds^2 Invariant Interval: Sign Dependence?
- binbagsss
- · Replies 3 ·
Graduate Deriving FRW Metric: Ricci Vector Algebra Explained
- binbagsss
- · Replies 1 ·
Graduate Solve Einstein Field Equation without Vacuum Solution
- TimeRip496
- · Replies 4 ·
Graduate Difference between images produced by gravitational lensing
- PWiz
- · Replies 12 ·
Graduate I'm having trouble understanding Lorentz transforms
- davidbenari
- · Replies 31 ·
Graduate What does it mean to contract μ with α?
- unscientific
- · Replies 3 ·
Graduate Solving Tensor Index Manipulation Confusion
- kau
- · Replies 1 ·
Graduate Why never any length expansion under Lorentzian Relativity?
- hkyriazi
- · Replies 7 ·
Graduate Find lorentz transformation for arbitrary velocity (v) relat
- Pual Black
- · Replies 19 ·
Graduate Can EM waves carry information faster than light?
- Cobalt101
- · Replies 4 ·
Graduate Link between SR and a magnetic field
- arydberg
- · Replies 18 ·
Undergrad Why Is Gravity Different from Electromagnetic Radiation?
- TimeRip496
- · Replies 11 ·
Undergrad Why does Earth seem stationary in the twin paradox?
- willm78
- · Replies 15 ·
Graduate Is space really just an illusion?
- Rajkovic
- · Replies 7 ·
Graduate Were there objections to Einstein's theory of relativity?
- blue_leaf77
- · Replies 35 ·
Graduate What is the Difference Between Vectors and Dual Vectors in Spacetime?
- pierce15
- · Replies 13 ·
Graduate Electric dipole equivalence principle paradox?
- jcap
- · Replies 1 ·
Graduate Is Absolute Space and Time Really Absolute?
- name123
- · Replies 44 ·
Graduate Does length contraction apply to the spaceship in the twin paradox?
- Dave1939
- · Replies 13 ·
Graduate What Are the Limits of Classical Physics in Understanding Inertial Frames?
- inkliing
- · Replies 4 ·
Graduate Time Dilation Effects on a Probe
- bodykey
- · Replies 10 ·
Graduate Equivalence Principle Test Kits
- Edward Wij
- · Replies 35 ·
Undergrad Why isn't pi in the Schwarzschild radius equation?
- carcosachild
- · Replies 1 ·
Graduate Special Relativity: Solving for τ
- Holystromboli
- · Replies 4 ·
Graduate Why gravity shielding isn't possible
- TimeRip496
- · Replies 1 ·
Graduate Eotvos effect - Apparent only?
- Simple_One
- · Replies 2 ·
Graduate Why is Normal Area to Light Rays Invariant?
- center o bass
- · Replies 1 ·
Undergrad How many observers are needed to calculate the relativistic speed equation?
- Quarlep
- · Replies 3 ·
Graduate Are all solutions to Einstein's Field Equations Lorentzian manifolds?
- ShayanJ
- · Replies 7 ·
Graduate How Do You Expand the Antisymmetrized Tensor \( T_{1234} \)?
- PhyAmateur
- · Replies 7 ·
Graduate Is the Perspective of a Photon in Relativity Truly Timeless?
- SovereignX
- · Replies 2 ·
Graduate Why does observer C measure event X at a different time?
- name123
- · Replies 11 ·
Graduate Deflection of Light Around Massive Bodies
- DiracPool
- · Replies 4 ·
Graduate Light Production in Gravity: Freq/Energy Impact?
- Gary Boothe
- · Replies 5 ·
Graduate Does relative motion correspond to rotation of spacetime axes?
- Holystromboli
- · Replies 6 ·
Graduate Why can different observers agree on their relative velocity
- davidbenari
- · Replies 9 ·
Graduate Why does kinetic energy appear to increase in free fall frames?
- david316
- · Replies 5 ·
Graduate Curved-space Maxwell equations by differential forms?
- center o bass
- · Replies 9 ·
Graduate Deriving Max Symmetric Space from Spherically Symmetric - Sean M. Carroll
- binbagsss
- · Replies 2 ·
Graduate Deriving the Christoffel symbol Γ₀₀^μ from the metric
- unscientific
- · Replies 8 ·
Graduate Moving object launched by observer into a Wormhole
- Quds Akbar
- · Replies 1 ·
Graduate Intersteller: Lecture by Kip Thorne
- Rising Eagle
- · Replies 1 ·
Graduate Gravity's reaction force in the relativist model?
- NoBodyAlive
- · Replies 1 ·
Graduate Does the Einstein Field Equation Apply to Small Particles like Electrons?
- TimeRip496
- · Replies 11 ·
Undergrad Why does time dilation appear symmetric between observers?
- asdff529
- · Replies 10 ·
Graduate Heuristic Evaluation of Stress-Energy Tensor
- Itserpol
- · Replies 2 ·
Graduate Why does the metric tensor satisfy ∇ᵃgₐᵦ = 0?
- binbagsss
- · Replies 13 ·
Graduate Schwarzchild metric spherically symmetric space or s-t?
- binbagsss
- · Replies 9 ·
Graduate Solving Einstein's Equation with Cosmological Constant: De Sitter Space
- binbagsss
- · Replies 3 ·
Graduate Non-Constant Cosmo-Constant: Controversy in GR?
- ChrisVer
- · Replies 1 ·
Graduate Resolving Ehrenfest Paradox: STR vs General Theory
- wellorderingp
- · Replies 7 ·
Graduate How do moving and static observers slice curved spacetime in general relativity?
- smoothoperator
- · Replies 4 ·
Graduate Aging when travelling near the speed of light
- Cyran
- · Replies 22 ·
Graduate Coordinate basis for cotangent space
- Ibix
- · Replies 4 ·
Graduate Accelerometer readings and the equivalence principle
- Didymus5
- · Replies 13 ·
Graduate Is the depiction of curvature in wormhole diagrams accurate or misleading?
- DaveC426913
- · Replies 8 ·
Graduate Birkhoff's Theorem: Spherically Symmetric Vacuum Solution Static or Stationary?
- binbagsss
- · Replies 3 ·
Graduate FRW Metric in d Dimensions: Can I Expand?
- ChrisVer
- · Replies 3 ·
Graduate What is a null geodesic in Dirac's relativity book?
- exmarine
- · Replies 7 ·
Graduate Is Uncertainty in Physics Related to Relativity's Concept of Velocity?
- Holystromboli
- · Replies 6 ·
Graduate Are Everyday Objects Spacelike?
- Dixanadu
- · Replies 6 ·
Graduate Does a particle's energy determine its interaction with the Higgs field?
- Quds Akbar
- · Replies 2 ·
Graduate How Killing tensors relate to energy-momentum conservation in FRW
- binbagsss
- · Replies 6 ·
Graduate Post-Newtonian gravity simulation off by two orders of magnitude
- goalie39
- · Replies 2 ·
Graduate Looking for 'absolute still' with time dilation
- Labyrinth
- · Replies 3 ·
Graduate Index Notation: Understanding LHS = RHS
- unscientific
- · Replies 8 ·
Undergrad Einstein Mass-Energy Equation: Will Mass Change?
- pap123456
- · Replies 7 ·
Graduate What do you mean, approaching the speed of light?
- Holystromboli
- · Replies 13 ·
Graduate Einstein Equation Quick sign question
- binbagsss
- · Replies 8 ·