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 Schwarzschild Singularity & Black Hole: Same or Different?
- jeremyfiennes
- · Replies 1 ·
Undergrad A variation of the twin paradox
- imsmooth
- · Replies 24 ·
Undergrad Twin paradox: why does the leading clock appear to run faster on return?
- Sorcerer
- · Replies 3 ·
Undergrad Twin paradox with fractional speed and instantaneous return
- m4r35n357
- · Replies 15 ·
High School Accelerating Expansion of Cosmos: Measured in Multiple Directions?
- exmarine
- · Replies 7 ·
Undergrad Lorentz Symmetry at Black Hole Event Horizon
- Milsomonk
- · Replies 3 ·
Undergrad Relativistic Simultaneity: A Thought Experiment
- Milsomonk
- · Replies 7 ·
Undergrad Index placement -- Lorentz transformation matrix
- dyn
- · Replies 9 ·
High School How does gravitational potential energy work in curved spacetime?
- PaulCam
- · Replies 5 ·
Undergrad Einstein's Equivalence Principle: Freely Falling Local Frames
- Jazzyrohan
- · Replies 4 ·
Undergrad Coordinates for diagonal metric tensors
- Ibix
- · Replies 12 ·
Undergrad Gravity Propagation: How Does Time Affect Orbital Modeling?
- TheGalaxyOfGold
- · Replies 2 ·
Undergrad Mass/Density Increase in Motion: Relativistic or Observable?
- CasualCalculus
- · Replies 9 ·
Undergrad Energy stored in space-time or space?
- Euthan
- · Replies 7 ·
Undergrad What is the mechanism by which energy/stress curves spacetime
- Sorcerer
- · Replies 39 ·
Undergrad What Happens to Objects When the Higgs Field is Negated?
- BadgerBadger92
- · Replies 9 ·
Undergrad The light from Mercury, the Sun's corona and gravity
- Wondermine
- · Replies 3 ·
Undergrad Uniform gravity's space-time curvature
- max_zhou
- · Replies 26 ·
High School Confirmation of c as Invariant Speed in Our Universe?
- tworitdash
- · Replies 8 ·
High School Gravity in Hollow Shell: Nonadditivity and Relativistic Self-Interaction
- snorkack
- · Replies 2 ·
High School Photon Travel: Is Our Universe a Single Point?
- tworitdash
- · Replies 9 ·
Undergrad Experimental verification of constant c when all units scale with it
- Killtech
- · Replies 50 ·
High School Special relativity - frame of reference
- victorqed
- · Replies 123 ·
Undergrad Can LIGO detect a massive object traveling near light speed?
- JasonGodbout
- · Replies 1 ·
Undergrad GR in Milky Way: Approximating an Inertial Ref Frame?
- Sorcerer
- · Replies 9 ·
High School Solve Relativistic "Bug on Band" Problem
- Hiero
- · Replies 3 ·
Undergrad Why doesn't B age less than A in the twin paradox if B sees A receding?
- jha192001
- · Replies 7 ·
Undergrad Would Relativistic Effects Exist Without an Ultimate Speed?
- Jazzyrohan
- · Replies 4 ·
Undergrad Can we create a universe from energy according to E=mc²?
- member 342489
- · Replies 9 ·
Undergrad Do black holes accumulate neutrinos?
- synch
- · Replies 26 ·
Undergrad Does an Electron's Field Expand at c Upon Spontaneous Creation?
- idea2000
- · Replies 5 ·
High School Are objects accelerating together in the same direction inertial to each other?
- jaketodd
- · Replies 70 ·
High School Do moving train observers see different lightning intensities and color shifts?
- FactChecker
- · Replies 15 ·
Undergrad Number of Solutions of Einstein Field Equations w/ Zero Pressure
- kent davidge
- · Replies 16 ·
High School Effects on Area Outside Wormhole: Radiation, Magnetic Field, Anomalies
- Michael Chase
- · Replies 6 ·
High School Are gravitational and inertial mass different in relativity?
- Lee Sung Bin
- · Replies 9 ·
Undergrad How does the speed of light affect clocks?
- Sonderval
- · Replies 10 ·
High School Can an observer perceive he is traveling faster than light?
- GrantSB
- · Replies 27 ·
High School Multiple Curves in Space-Time: Masses on a Trampoline
- BeedS
- · Replies 6 ·
Undergrad How does the motion of colliding billiard balls change under Special Relativity?
- neilparker62
- · Replies 10 ·
Undergrad Time dilation between clocks at ground level and top of Burj Khalifa
- Anakin Delabelle
- · Replies 3 ·
High School Gravitational Time Dilation: Math Formula for Clock-Slowing Factor
- jeremyfiennes
- · Replies 9 ·
Undergrad Hash marks on minkowski diagram
- idea2000
- · Replies 8 ·
Undergrad Derivation of Rindler Metric and How It Resolves the Twin Paradox
- Chare
- · Replies 9 ·
Undergrad Does the Invariance of Proper Time Lead to the Lorentz Transformation?
- idea2000
- · Replies 26 ·
High School Black Holes Collide at 0.999c - What Happens?
- arusse02
- · Replies 14 ·
Undergrad Is There a Preferred Direction in Time?
- idea2000
- · Replies 7 ·
Undergrad Non-inertial reference frames question
- Freixas
- · Replies 34 ·
Undergrad Why does light have wavelength if length contraction reduces it to zero?
- Amaterasu21
- · Replies 6 ·
High School Refined Interpretation of Relativity of Simultaneity?
- Buckethead
- · Replies 9 ·
Undergrad How can a moving clock slow down yet show more elapsed time?
- Jazzyrohan
- · Replies 9 ·
High School What if light were influenced by gravity?
- Antonio dela Vinci
- · Replies 31 ·
Graduate Momentum calculation of a rotating rod
- liuxinhua
- · Replies 56 ·
High School Can acceleration be measured against the speed of light?
- Sir Deja Doog
- · Replies 16 ·
Graduate Constructing Bondi Coordinates on General Spacetimes
- leo.
- · Replies 4 ·
High School Time Travel into the Future: What Would Be the Reason?
- RandyD123
- · Replies 9 ·
High School Find a Virtual SR Globe App - SiennaTheGr8
- Grinkle
- · Replies 3 ·
Undergrad How certain are we about black hole mass density?
- hkyriazi
- · Replies 55 ·
Undergrad Why does length contraction apply differently in different reference frames?
- Nathan123
- · Replies 71 ·
Undergrad Understanding Black Hole Entropy: Consistency Across Reference Frames
- FallenApple
- · Replies 1 ·
Undergrad Why did Einstein considered it “evident”?
- Alfredo Tifi
- · Replies 18 ·
Undergrad Does a Photon Carry Velocity of Its Source?
- vincent
- · Replies 2 ·
Undergrad Symmetry Group Freedom: Choosing How Groups Act on Coordinates
- kent davidge
- · Replies 1 ·
Undergrad Why not length expansion opposite to the direction of movement
- Nathan123
- · Replies 8 ·
Graduate General Relativity Book Recommendations
- Sandeep T S
- · Replies 1 ·
High School Gravity Power: What Gives It the Ability to Accelerate Objects?
- harrylentil
- · Replies 6 ·
High School Do single moving charges create magnetic fields, why?
- Jonathan1218
- · Replies 6 ·
High School Constant acceleration and proper time in special relativity
- McSeb
- · Replies 14 ·
Undergrad Relative Simultaneity: Free Resources to Help You Understand
- Kiley
- · Replies 16 ·
Undergrad Massless Electron Compton Scattering: Energy of Outgoing Photon
- Silviu
- · Replies 1 ·
Undergrad Which Calculation Is Correct for Meteor Evasion Time in Spacetime Physics?
- bksree
- · Replies 2 ·
Undergrad Why do we need to modify GR with theories like F(R) ?
- Safinaz
- · Replies 13 ·
High School Why can't particles reach the speed of light?
- alejandromeira
- · Replies 17 ·
Undergrad Inertial frame of freely falling body
- bksree
- · Replies 16 ·
Undergrad Why doesn't the ether theory add the source's motion to light speed?
- Luis Babboni
- · Replies 10 ·
High School Calculate Proper Time for Two Events in Special Relativity
- electronneutrino
- · Replies 5 ·
Undergrad Is the wave four-vector k^μ invariant under Lorentz transformations?
- facenian
- · Replies 14 ·
Undergrad Musings, seeking opinions about the nature of time
- Kenwstr
- · Replies 1 ·
Undergrad Alice with constant acceleration and Bob's signal pulses
- MathematicalPhysicist
- · Replies 31 ·
Graduate Is a volume element in relativity represented by a vector?
- pervect
- · Replies 11 ·
Graduate Electromagnetism for Media in Arbitrary Motion
- Cryo
- · Replies 8 ·
Undergrad Interstellar Travel vs Universe Expansion: Is Andromeda Reachable?
- kent davidge
- · Replies 1 ·
Undergrad Light paths in black hole diagrams
- Ryan Walsh
- · Replies 3 ·
Undergrad How Does Gravity Specifically Influence Mass?
- synch
- · Replies 5 ·
High School Which interpretation is correct about crossing a black hole event horizon?
- Netspirit
- · Replies 18 ·
High School Calculating Lorentz Factor with V=0
- sqljunkey
- · Replies 2 ·
Undergrad Relativity of Simultaneity: Observers Perceiving 3 Events
- NTHstars
- · Replies 9 ·
Graduate Causal vectors between different dimensional metrics
- smoking-frog
- · Replies 12 ·
Undergrad Coordinate transformations in GR
- eoghan
- · Replies 29 ·
High School Is Time Experienced by Photons at the Speed of Light?
- YoungPhysicist
- · Replies 84 ·
Undergrad Relativistic harmonic oscillator
- gerald V
- · Replies 7 ·
Undergrad Understanding Lorentz Transform Outputs
- TomTelford
- · Replies 10 ·
Undergrad Relativistic speed of a rocket with constant thrust
- Flisp
- · Replies 114 ·
Undergrad Do the twin paradox predictions fail when spaceships return to the start point?
- name123
- · Replies 200 ·
Undergrad Why Does Energy Have Mass in Quantum Field Theory?
- Hasan Delifer
- · Replies 10 ·
Undergrad GPS relativity error - really?
- Prometeus
- · Replies 31 ·
Graduate What is the Relativity of Wrong?
- FallenApple
- · Replies 4 ·
High School Can spacetime have zero energy-momentum without including gravitational field energy?
- sqljunkey
- · Replies 7 ·
Undergrad Cylindrical Microwave Cavity Resonator: Speed of Light Dependency?
- CompSci
- · Replies 2 ·
High School Deriving Lorentz Factor: An Analysis of Jimmy360's Method
- DatLemonDoe
- · Replies 4 ·