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 Can normal force allow escape from inside a black hole's event horizon?
- livethere
- · Replies 3 ·
Undergrad Can a time-varying gravitomagnetic field cause rotation?
- snorkack
- · Replies 3 ·
Graduate NASA's experiment with a gyroscope featured in Fabric of the Cosmos
- bluemoonKY
- · Replies 7 ·
Undergrad Why is speed of light constant in all frames of reference?
- LSMOG
- · Replies 9 ·
Undergrad Normal vector definition with arc length parameterization
- JulienB
- · Replies 1 ·
Undergrad Definition of a Lorentzian Wormhole
- Falcus
- · Replies 3 ·
Undergrad Doppler shift for an observer in circular motion
- BiGyElLoWhAt
- · Replies 5 ·
Graduate Numerical simulation the n-body problem under SR model
- astrof
- · Replies 17 ·
Undergrad Do objects in spacetime move at constant speed c?
- AstroMath
- · Replies 25 ·
High School Acceleration at Near-Light Speed: Answers
- derek10
- · Replies 4 ·
High School Why does time slow down instead of speed up when traveling at high speeds?
- KarminValso1724
- · Replies 9 ·
Undergrad Light speed and the LIGO experiment
- JohnnyGui
- · Replies 60 ·
Undergrad Understanding 4-Momentum in General Relativity
- davidbenari
- · Replies 4 ·
Graduate Meaning of ds^2 according to Carroll
- guitarphysics
- · Replies 31 ·
Undergrad Is the Block Universe Model Necessary if Presentism Can Adapt to Relativity?
- name123
- · Replies 12 ·
Undergrad Newtonian limit of Schwarzschild metric
- dwellexity
- · Replies 6 ·
High School Does Newton's gravity still apply to falling objects in general relativity?
- PhysicsBob
- · Replies 8 ·
Undergrad De Broglie Matter Waves: Where Does the Fraction Come From?
- Matter_Matters
- · Replies 1 ·
Graduate Metric of n-sheeted AdS_3: Constructing BTZ
- craigthone
- · Replies 2 ·
Undergrad Can Tachyonic Antitelephone Overcome Causality and Chronology Protection?
- Falcus
- · Replies 2 ·
High School Does your age only change when accelerating?
- idea2000
- · Replies 18 ·
Graduate Deriving the equation of motion for spin connection from Einstein-Hilbert action
- shereen1
- · Replies 2 ·
High School Is the mass of a photon always negligible compared to that of a proton?
- Stephanus
- · Replies 13 ·
High School Gravitational Waves Speed: Can We Observe It?
- KarminValso1724
- · Replies 3 ·
Undergrad Geodesics in Curved Spacetime: What is the Significance of the ct Increment?
- Bob R
- · Replies 8 ·
Undergrad Generalization of Lorentz ether
- Ilja
- · Replies 49 ·
High School Why hasn't the primordial radiation from the big bang passed us by?
- ScottVal
- · Replies 4 ·
Undergrad Is Zitterbewegung Considered in the Theory of Relativity?
- sweet springs
- · Replies 1 ·
Undergrad New interpretations of the Pioneer effect ?
- fhenryco
- · Replies 1 ·
Undergrad Understanding 4-Momentum in Special Relativity
- nikolafmf
- · Replies 4 ·
High School Why can't I use Earth as a reference frame for the whole universe in GR?
- Emanphys
- · Replies 4 ·
High School Could discontinuous spacetime regions create gravity that attracts matter?
- Donald Marks
- · Replies 4 ·
High School What inspired Einstein to develop relativity theory?
- Anjum S Khan
- · Replies 10 ·
Undergrad Confusion about killing horizon in Carroll
- hideelo
- · Replies 1 ·
Undergrad The Order and Valence of Tensors
- WelshieTheWhite
- · Replies 6 ·
Undergrad Proving Orthogonality of Vector w/ Schnutz Special Relativity Tensors
- fengqiu
- · Replies 9 ·
Undergrad Open Problem in S.R. Pre-Determinism: Unresolvable Question
- greswd
- · Replies 1 ·
High School Relating period and frequency in relativistic Doppler derivation
- SiennaTheGr8
- · Replies 22 ·
Undergrad Deriving Einstein's Relativity Postulates from Minkowski Spacetime
- AstroMath
- · Replies 8 ·
High School How can we observe symmetry in a closed system without external reference?
- Jimster41
- · Replies 18 ·
Graduate Evolution of Scalar Field: Equation Demonstration
- valesdn
- · Replies 5 ·
High School Length contraction vs Space time
- fredreload
- · Replies 34 ·
Undergrad Does light from distant galaxies travel at c in round-trip measurements?
- dougy
- · Replies 9 ·
Undergrad Apparent contradiction between Lorentz transformation and proper time equations
- Dyatlov
- · Replies 4 ·
Undergrad Frame dependency of accelerations
- Masterov
- · Replies 14 ·
High School A Speed of Light Theoretical Question
- science_rules
- · Replies 25 ·
Undergrad Basic question, harmonic coordinate condition algebra
- binbagsss
- · Replies 6 ·
Undergrad Would Mercury's orbit discrepancy occur with electromagnetic force instead of gravity?
- Zayl
- · Replies 13 ·
Undergrad Volume of light cones of two events
- A Dhingra
- · Replies 3 ·
High School Why Do Newton's Laws of Motion Fail at Relativistic Speeds?
- Holden Kenne
- · Replies 25 ·
High School Final velocity of an object falling into a black hole
- Einstein's Cat
- · Replies 13 ·
Graduate How do varying alpha and cosmological expansion affect spectral lines differently?
- fhenryco
- · Replies 2 ·
Undergrad Dark Energy vs Gravity: Expansion vs Contraction
- asimov42
- · Replies 4 ·
Undergrad Composite Galilean transformation in 2 dimensions
- Afterthought
- · Replies 6 ·
Undergrad General Relativity within the confines of a Hilbert Space
- Perturbative
- · Replies 1 ·
Graduate Time Travel to Future: Is There a Minimum Speed?
- Dakota
- · Replies 2 ·
Undergrad Motivation for the introduction of spacetime
- Frank Castle
- · Replies 12 ·
Undergrad Researching Causal Structure in Classical GR for Graduate Course
- hideelo
- · Replies 1 ·
Undergrad Did universe expand faster than speed of light?
- sean39
- · Replies 18 ·
Undergrad Light deflection and geodesics
- VladZH
- · Replies 33 ·
High School "Length contraction" prior to observation/measurement
- Michael Mooney
- · Replies 1 ·
Undergrad How are coordinates defined in the weak field metric?
- PeroK
- · Replies 5 ·
Undergrad Why is B's clock in advance instead of A's?
- Benoit
- · Replies 8 ·
Undergrad Why do gravitational waves travel at light speed?
- joswitz
- · Replies 3 ·
Graduate Force Question – Einstein Gravitational Constant
- chemguy777
- · Replies 4 ·
Undergrad Conservation of matter energy momentum tensor beyond GR
- fhenryco
- · Replies 3 ·
Undergrad Understanding Falling with Horizontal Velocity
- Figaro
- · Replies 9 ·
High School Would time slow down tied to a nuclear-powered oscillator?
- DavidReishi
- · Replies 13 ·
High School Speed of Objects Falling to Black Hole Center
- jBase
- · Replies 2 ·
High School Can a Photonic Boom Explain the Origin of the Universe?
- Clever boy
- · Replies 13 ·
Graduate Calculate the Weyl and Ricci scalars for a given metric
- suresh chand
- · Replies 7 ·
High School How Do Electron Orbitals Work at Relativistic Speeds?
- Arubi Bushlee
- · Replies 4 ·
High School How to calculate E=mc² from the Lorentz formulas
- Noah Englehart
- · Replies 13 ·
Undergrad Does time dilation cause the speed of light to be invariant?
- Sentosa
- · Replies 50 ·
Undergrad Geometric Interpretation of Einstein Tensor
- Markus Hanke
- · Replies 9 ·
High School How does a photon have momentum if its mass is zero?
- Gabriele Pinna
- · Replies 9 ·
Graduate Is Newton's third law of motion consistent with GTR?
- Ahan Sha
- · Replies 59 ·
High School Trajectory of a photon in a moving box
- flexible_time
- · Replies 8 ·
Undergrad Can a human survive crossing a black hole's event horizon?
- nomadreid
- · Replies 28 ·
High School The Paradox of Mass Distortion in Collider Experiments
- idea2000
- · Replies 7 ·
Graduate Topology of Spacetime: Can Singularities and Fermions Co-exist?
- Narasoma
- · Replies 1 ·
High School What happens to the matter inside a black hole when it dies?
- CrackerMcGinger
- · Replies 15 ·
Undergrad Gravitational wave time variation
- andrew s 1905
- · Replies 49 ·
Undergrad Solving Determination of Locally Inertial Coordinates
- mgal95
- · Replies 2 ·
Undergrad Proving Killing Vector of Static Spacetime - David
- dman12
- · Replies 1 ·
High School Ether and Michelson-Morley experiment
- rakhi israni
- · Replies 15 ·
High School How can a light clock tick once per meter even when in motion?
- DAC
- · Replies 12 ·
Undergrad How do Schwarzschild and FRW metrics coexist at different scales?
- ChrisVer
- · Replies 1 ·
Undergrad How can we visualize spin being invariant?
- idea2000
- · Replies 11 ·
Undergrad Time in gravitational reference frame?
- tim9000
- · Replies 43 ·
High School Do Gravity Waves and Sound Waves Share Frequencies?
- carl susumu
- · Replies 14 ·
High School Why do objects always revolve around each other in space?
- Stephanus
- · Replies 23 ·
High School Solving Special Relativity Problems: Interval vs Lorenz Equations
- arydberg
- · Replies 9 ·
Undergrad Energy and momentum for a particle traveling at light speed
- Felix Quintana
- · Replies 11 ·
High School Solving the Paradox of Rope: Transmission of Info in GR
- Javier Chornet
- · Replies 4 ·
High School Moving clock as seen by an observer at rest
- samirgaliz
- · Replies 31 ·
Graduate What causes time dilation: speed or acceleration?
- SpiderET
- · Replies 50 ·
High School Einstein’s equivalence principle for a collapsed star
- MaxWallis
- · Replies 17 ·
High School Does E=mc² mean extra kinetic energy adds mass to moving objects?
- vin300
- · Replies 35 ·
High School Can spacetime be ripped or broken?
- Allen_Wolf
- · Replies 4 ·