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
Insights Intro to Centrifugal Force Reversal in Kerr Spacetime
- PeterDonis
- · Replies 0 ·
Undergrad Muon Time Dilation in Accelerating Frames
- bksree
- · Replies 2 ·
Graduate Mathematical description of spaghettification near a black hole
- zvwner
- · Replies 4 ·
Undergrad Momentary Co-Moving Reference Frame in SR
- Vitani1
- · Replies 3 ·
High School Einstein's Train: Light Travel Time Explained
- David Lewis
- · Replies 4 ·
Undergrad Energy in the Schwarzschild spacetime
- pervect
- · Replies 30 ·
Graduate Learning differential forms and tetrad notation
- gnnmartin
- · Replies 10 ·
Undergrad Does Spacelike Worldlines Exist?
- kent davidge
- · Replies 3 ·
High School Why do opposite light beams have the same speed if Earth is moving?
- Inertia_Squared
- · Replies 6 ·
High School Was Einstein's second postulate about light speed revolutionary?
- UuserForMe
- · Replies 25 ·
High School Time Dilation: Orbit Earth at Light Speed, What Happens?
- Drizy
- · Replies 8 ·
Undergrad How to call an invariant quantity?
- kent davidge
- · Replies 16 ·
Undergrad Transformation of Intrinsic Spin: Does it Transform Like a 4-Vector?
- Hiero
- · Replies 3 ·
High School How can a photon have frequency if time stops at light speed?
- akaSmith
- · Replies 23 ·
Undergrad How Does Hawking Radiation Lead to Black Hole Evaporation?
- docnet
- · Replies 8 ·
High School Does wave propagation depend on medium density rather than medium type?
- geordief
- · Replies 22 ·
High School How does GR explain acceleration toward Earth in an inertial frame?
- Karl Coryat
- · Replies 8 ·
Undergrad The 1964 W. Bertozzi experiment
- avicenna
- · Replies 3 ·
Undergrad Observing Black Hole Collisions: Time Dilation Explained
- imsmooth
- · Replies 2 ·
High School Understand Spacelike Timelines: Carroll Page 71
- sqljunkey
- · Replies 3 ·
High School Using a light clock to detect length contraction in different spacetime regions
- sqljunkey
- · Replies 23 ·
High School Does E=mc^2 apply to gravitational potential energy?
- snoopies622
- · Replies 62 ·
High School Understanding Tensor Indices and Conservation
- etotheipi
- · Replies 9 ·
Undergrad Acceleration Frame in SR: References for Research
- Haorong Wu
- · Replies 4 ·
High School Gravitational waves from Earth's orbital and rotational motion
- roineust
- · Replies 24 ·
High School Photon Energy Change: Speed of Light
- danielhaish
- · Replies 4 ·
High School Gravitational Waves: Prevalence Across the Universe
- roineust
- · Replies 4 ·
High School Measuring Gravitational Waves w/ Elevator Accelerometer
- roineust
- · Replies 3 ·
High School Can gravitational waves interfere with a Cavendish gravimeter?
- roineust
- · Replies 4 ·
Undergrad Understanding Michelson Morley Experiment
- Albertgauss
- · Replies 14 ·
High School What if you stood completely still in the universe?
- xAceKing
- · Replies 3 ·
High School Gravitational Waves in Positively Curved Universe?
- tovisonnenberg
- · Replies 1 ·
Undergrad Equation for Gravity Going to Zero at Finite Distance?
- jaketodd
- · Replies 9 ·
Graduate Questions about derivation of GR and applications of it
- trees and plants
- · Replies 8 ·
High School Converting Newtonian momentum into relativistic momentum
- PainterGuy
- · Replies 28 ·
High School Event moving in and out of past light cone with frame changes
- Grinkle
- · Replies 12 ·
Undergrad Maxwell stress tensor and coercion of field values in the Lorentz force
- goran d
- · Replies 11 ·
Undergrad Does Acceleration Affect Event Horizon Location?
- awardr
- · Replies 3 ·
Undergrad Does the event horizon radius appear the same from different distances?
- DarkMattrHole
- · Replies 16 ·
High School How Does Parallel Transport Affect Vector Components and Their Changes?
- Shirish
- · Replies 24 ·
Undergrad How could all matter fit in an impossibly small space before the big bang?
- thegroundhog
- · Replies 5 ·
Undergrad Is space curved at the center of gravity?
- King Solomon
- · Replies 30 ·
Undergrad Twin Paradox Time Dilation in Positively Curved Universe
- Hiero
- · Replies 24 ·
Undergrad Deriving equation (3) from the stress-energy tensor
- fab13
- · Replies 4 ·
Undergrad Deriving the equivalence principle from Newtonian mechanics
- Frank Castle
- · Replies 122 ·
High School How does mass affect the curvature of spacetime inside a black hole?
- BillDennis
- · Replies 2 ·
Graduate Riemann tensor expressed using metric and derivatives
- Jogging-Joe
- · Replies 5 ·
Undergrad Virtual Tidal Effect in Accelerating Ship - Does it Exist?
- DarkMattrHole
- · Replies 6 ·
Graduate Coordinate Infall Time for a Vaidya Black Hole
- Markus Hanke
- · Replies 46 ·
High School Do things that fall into black holes ever reach the singularity?
- docnet
- · Replies 11 ·
High School Does Hubble's law violate the speed of light limit?
- docnet
- · Replies 15 ·
Undergrad Lorentz Transforms of Electromagnetic Fields
- Glenn Rowe
- · Replies 7 ·
High School Does AANEC rule out wormholes and warp drives?
- A Middle Aged Man
- · Replies 21 ·
Undergrad Why Do Objects Fall Along Spacetime Ripples?
- Lars1408
- · Replies 16 ·
Insights Learning Twin Paradox for Freely-Falling Observers
- vanhees71
- · Replies 2 ·
Undergrad Why does free fall affect clock rates in satellites if it's not related to time dilation?
- vector222
- · Replies 26 ·
Undergrad Relativistic Effect of Time Dilation: What is it Called?
- Gerinski
- · Replies 4 ·
High School Time Dilation: Direction of Motion's Effect
- Lars1408
- · Replies 8 ·
High School A thought experiment about the Sun vanishing
- Hamiltonian
- · Replies 12 ·
Undergrad Inquiry about a derivation in "A First Course in GR" by Schutz
- MathematicalPhysicist
- · Replies 13 ·
Undergrad Can I use family of worldlines instead of congruence?
- kent davidge
- · Replies 13 ·
Undergrad Spacetime distance between spacelike related events
- cianfa72
- · Replies 41 ·
High School How are space and time related?
- D0rk_L0rd
- · Replies 4 ·
Undergrad Is my angled Lorentz factor derivation correct?
- TheSurfers12
- · Replies 8 ·
Undergrad Why do closed timelike curves not violate determinism in general relativity?
- jk22
- · Replies 3 ·
High School Does a photon maintain speed c relative to both spaceships if one accelerates?
- entropy1
- · Replies 22 ·
Undergrad Does a coil moving upward see induced voltage from a stationary charge?
- jcap
- · Replies 24 ·
Undergrad Twin Paradox Freely Falling Observers
- vanhees71
- · Replies 2 ·
Undergrad Lorentz transformation for derivatives
- Haorong Wu
- · Replies 14 ·
High School Gravity Inside a Hollow Sphere
- jayromano
- · Replies 8 ·
Undergrad Does dropping matter into a black hole change its properties?
- DrStupid
- · Replies 6 ·
High School Can You Experience Time and Decay While Falling Into a Black Hole?
- Matt204823545
- · Replies 14 ·
High School Why do clocks differ when moved with equal acceleration in opposite directions?
- docnet
- · Replies 9 ·
High School Particle Disintegration and Momentum Conservation in Relativity
- etotheipi
- · Replies 13 ·
Undergrad "Time is an illusion" according to Einstein
- Blub
- · Replies 11 ·
High School How Do Physicists Explain Black Hole Formation and Electromagnetic Repulsion?
- docnet
- · Replies 4 ·
Graduate Metric-compatible connections and index-free notation for tensor equations
- Shirish
- · Replies 1 ·
High School What Happens to Time on a Clock at r=r_{s}/2 Inside a Schwarzschild Black Hole?
- snoopies622
- · Replies 11 ·
Undergrad The Twin Paradox implies that the Universe as a whole is a special frame
- jamesadrian
- · Replies 32 ·
Undergrad Why do photon orbits depend on the ratio of angular momentum to energy?
- sqljunkey
- · Replies 17 ·
Undergrad Deriving Lorentz Transformations Using Calculus
- Ryder Rude
- · Replies 18 ·
Undergrad Apparent Violations of Principle of Relativity?
- BruceAW
- · Replies 2 ·
Undergrad A version of the twin paradox without accelerations
- George Plousos
- · Replies 67 ·
Undergrad Proving Antisymmetry of Electromagnetic Field Tensor with 4-Force
- Little Gravity
- · Replies 4 ·
Undergrad Does General Relativity explain inertia?
- jcap
- · Replies 38 ·
Undergrad Twin paradox with one twin traveling between Earth and a distant planet
- Will Flannery
- · Replies 137 ·
High School Can gravitational wave detectors become sensitive enough to detect an Earth-like planet?
- roineust
- · Replies 38 ·
High School How to select the smooth atlas to use for spacetime?
- Shirish
- · Replies 50 ·
Undergrad Thought Experiment Proving Newtonian Momentum Not Conserved
- quasar987
- · Replies 6 ·
Undergrad Spherically Symmetric Metric: Is Singularity Free?
- sqljunkey
- · Replies 3 ·
Undergrad Do moving massive objects drag curved spacetime with them?
- hnaghieh
- · Replies 74 ·
Undergrad Mass of the Moon and Gravitational Lensing
- Helena Wells
- · Replies 14 ·
Undergrad Why is gravitational redshift expressed as velocity rather than as a ratio?
- Zman
- · Replies 5 ·
Undergrad Calculating Surface Area of Schwarzschild Black Hole w/Weyl Coordinates
- user1139
- · Replies 15 ·
Undergrad Size Limit of Accelerated Rigid Body in Irrotational Born Rigid Motion
- pervect
- · Replies 12 ·
High School Why doesn't the speed of light vary with the emitter's motion?
- greg_rack
- · Replies 29 ·
Undergrad Why did Einstein emphasize simultaneity over symmetry in debates with Bergson?
- bhobba
- · Replies 16 ·
High School Twin paradox with counter-rotating spacecraft in a gravitational field
- rolling stone
- · Replies 18 ·
Undergrad Twin paradox with 1 light-year separation at 0.5c
- almarino dtd
- · Replies 1 ·
High School Potential Energy formula in Special Relativty
- Sagittarius A-Star
- · Replies 82 ·