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 The reason why you can't accelerate to light speed
- acesuv
- · Replies 7 ·
High School Terminology of Convert: What's the Right Term?
- Semipro
- · Replies 4 ·
Graduate Understanding Mass in Relativity Theory: Definitions and Conflicting Views
- levokun
- · Replies 55 ·
Graduate Photon energy changing due to Dopplershift?
- Dreak
- · Replies 15 ·
Graduate Measuring velocity in empty space
- pearmtn
- · Replies 29 ·
Graduate Distances between planet and observer near BH
- sergiokapone
- · Replies 12 ·
Graduate Relativity of simultaneity objections
- mirrormirror
- · Replies 74 ·
Graduate How could a photon travel at lightspeed if it has mass?
- acesuv
- · Replies 4 ·
Graduate Accelerating Expansion of Space-Time and Implications for Time Itself
- messyties
- · Replies 4 ·
High School Space Time Explained: Physics & E=mc^2
- nst.john
- · Replies 6 ·
Graduate Objects accellerating due to each other's gravity
- michelcolman
- · Replies 14 ·
Graduate Does Time Really Flow Backwards?
- Fleyx
- · Replies 6 ·
Graduate Penrose Diagrams - Introduction
- Jolb
- · Replies 15 ·
Undergrad Observer S' on a rocket vs an observer S on Earth
- 71GA
- · Replies 3 ·
Graduate Need flat spacetime to define mass and spin?
- copernicus1
- · Replies 1 ·
Graduate Confused about length contraction
- medwatt
- · Replies 4 ·
Graduate Time & Speed of Photon: Questions Answered
- ShamelessGit
- · Replies 7 ·
Undergrad Does Energy Gravitate? A Check of Understanding
- russ_watters
- · Replies 38 ·
Graduate Does a photon experience time when slowed down by gravity?
- MR GREY
- · Replies 44 ·
Graduate Condition for close timelike curve?
- ngkamsengpeter
- · Replies 17 ·
Graduate Mass & Velocity: Gaining Momentum with Speed
- Saado
- · Replies 4 ·
Graduate Seeking clarification of time dilation
- acesuv
- · Replies 4 ·
Graduate Why we won't notice anything special when crossing the horizon?
- maxverywell
- · Replies 106 ·
Graduate Adding subluminal and superluminal velocities.
- mrspeedybob
- · Replies 2 ·
Graduate Acceleration and gravity, conceptual problems.
- tolove
- · Replies 6 ·
Graduate Upper limit for black hole’s rotational speed
- Eagle9
- · Replies 1 ·
Graduate What is the most fundamental axiom of General Relativity?
- TrickyDicky
- · Replies 12 ·
Graduate Reading Einstein's book & confused about simultaneous events
- cataclysmic
- · Replies 10 ·
Undergrad Why is light the fastest possible speed
- Saado
- · Replies 11 ·
Undergrad Gravity at its maximum range question.
- solar71
- · Replies 3 ·
Graduate Exterior derivative identity in vacuum space-time
- PhizKid
- · Replies 9 ·
Graduate Radial Schwarzschild geodesics - again
- tom.stoer
- · Replies 3 ·
Graduate Riemann curvature scalar, Ricci Scalar.What does they measure ?
- zn5252
- · Replies 4 ·
Graduate Unified or Fractured? Universe Info Transmission Speed
- JUrban
- · Replies 6 ·
Graduate How does matter accelerate in a gravitational field
- peterf1
- · Replies 37 ·
Graduate Muon Lifespan: How We Measure Decaying of Muons
- medwatt
- · Replies 3 ·
Graduate Can something with zero rest mass (photon) curve spacetime?
- 49ers2013Champ
- · Replies 20 ·
Graduate Moving Masses & Doppler Shifts in Flat Space-Time
- pervect
- · Replies 1 ·
Graduate What is the Form of Riemann Tensor in 3D?
- sadegh4137
- · Replies 1 ·
Graduate Notation for time in a relativistic graph
- cmcraes
- · Replies 11 ·
Graduate Wald Lemma 8.1.1-help with proof
- WannabeNewton
- · Replies 4 ·
Graduate Difference between black hole solutions and wormhole solutions
- extrads
- · Replies 2 ·
Graduate Black Holes & Time: A Collision of Forces
- michojek
- · Replies 1 ·
Undergrad Special relativity and stars' masses
- omiros
- · Replies 3 ·
Graduate Riemann Curvature Scalar Differs in Landau & MTW
- zn5252
- · Replies 2 ·
Graduate Questions on Weinberg Cosmology Book
- wphysics
- · Replies 1 ·
Graduate Lorentz transformation derivation. What exactly is wrong?
- epovo
- · Replies 12 ·
Graduate Sending information faster than speed of light?
- howabout1337
- · Replies 7 ·
Undergrad *If* the ISS is freely falling, doesn't that mean it's following
- 49ers2013Champ
- · Replies 6 ·
Graduate Does light exist outside of time ?
- boatdeck
- · Replies 5 ·
Graduate Time travel + conservation laws
- sWozzAres
- · Replies 8 ·
Undergrad Group velocity and phase velocity of a matter wave
- andrepd
- · Replies 10 ·
High School Listening to the Feynman tapes on youtube, and I have a question.
- 49ers2013Champ
- · Replies 4 ·
Undergrad Confusion with Michelson-Morley Experiment
- Jimmy87
- · Replies 2 ·
Undergrad Two questions about Special Relativity
- 49ers2013Champ
- · Replies 4 ·
Graduate More on gravitational time dilation and escape velocity.
- Shaw
- · Replies 20 ·
Undergrad Photons Affected by Pseudo Forces | Hyperspace by Michio Kaku
- deep838
- · Replies 8 ·
FAC Suggestion for Clarifying SR Theory
- bobc2
- · Replies 1 ·
Graduate Is Schwarzschild metric more intuitive?
- marlowgs
- · Replies 13 ·
Graduate Change in position/t greater than speed of light?
- howabout1337
- · Replies 2 ·
Graduate Is LET an Interpretation of SR?
- bobc2
- · Replies 10 ·
Graduate Mach's principle, GR and the nature of space
- epovo
- · Replies 35 ·
Graduate Lamp color before and after a phase of acceleration
- birulami
- · Replies 21 ·
Graduate Relative velocity and speed of light
- chipotleaway
- · Replies 17 ·
Graduate Gravitational time dilation and escape velocity
- Shaw
- · Replies 17 ·
Graduate Why is there a Minus in Spacetime Interval Formula?
- Physic lover
- · Replies 36 ·
Graduate Relativistic Magnetic Field of a moving charge
- GoodShow
- · Replies 8 ·
Undergrad What is a joule, when you calculate relativistic energy?
- Dgonzo15
- · Replies 7 ·
Graduate How Does the Affine Connection Contract in General Relativity?
- coqui82
- · Replies 4 ·
Graduate Question about instantaneous travel of information on a solid
- LazerStallion
- · Replies 25 ·
Graduate Complex Space Time: Interpret Metric Tensor gmn
- ngkamsengpeter
- · Replies 16 ·
Graduate Circular Orbit Four-Velocity and Schwarzschild Metric
- johne1618
- · Replies 2 ·
Graduate What Happens to Matter Inside a Black Hole's Infinite Density?
- acesuv
- · Replies 2 ·
Graduate Super-radiance of electromagnetic waves
- WannabeNewton
- · Replies 8 ·
Graduate Schwarzchild Radius: By definition must be dependent on distance.
- SarcasticSully
- · Replies 4 ·
Graduate Synchronous Coordinates transformation
- nicu15
- · Replies 13 ·
Graduate Bell's Spaceship Paradox and Length Contraction
- nosepot
- · Replies 137 ·
Graduate Determine Motion of Two Planes in Deep Space
- rajeshmarndi
- · Replies 4 ·
Graduate When a black hole is formed officially?
- maxverywell
- · Replies 9 ·
Graduate Distinguishing spacelike and timelike events
- amiras
- · Replies 3 ·
Graduate Why Does Integrating Relativistic Kinetic Energy Lead to Different Results?
- omiros
- · Replies 2 ·
Graduate Radius of a photon's circular orbit around a mass
- birulami
- · Replies 4 ·
Graduate Understanding Relativity: Chat with a Physics Professor Online for Clarity
- phillip1882
- · Replies 68 ·
Graduate Symmetrically Opposite Solution to Special Relativity
- wmikewells
- · Replies 11 ·
Where can I find english version of Ann. Soc. scient bruxelles A47, 49(1927)
- Manojg
- · Replies 3 ·
Graduate Is the Sun invisible at relativistic speeds?
- tionis
- · Replies 93 ·
Graduate Relativity with Charged Particles & Fluid Approx.
- qqqppp
- · Replies 1 ·
Graduate Error in Carroll's Lecture Notes on General Relativity pg. 186
- maxverywell
- · Replies 1 ·
Graduate Photon Arrival Rate: Doppler Effect Explained
- Alfred Cann
- · Replies 37 ·
Undergrad Analysis of Doppler Effect - Seeking Validation/Criticism
- Physics_start
- · Replies 25 ·
Graduate Are there simultaneous moments?
- Unidempicity
- · Replies 9 ·
Graduate Canonical Momenta Action Electromagnetism
- Yoran91
- · Replies 4 ·
Graduate Kruzkal Coordinates Inside Horizon: Defining u', v
- maxverywell
- · Replies 5 ·
Graduate Questions concerning GPS Navigation
- edraganov
- · Replies 8 ·
Undergrad Does time effect slowed light or not?
- Neuronsarecool
- · Replies 12 ·
Graduate Laws of Physics: Same Everywhere?
- Neuronsarecool
- · Replies 1 ·
Graduate Time dilation in gravitational field
- tonychinnery
- · Replies 24 ·
Can Closed Timelike Curves Make Time Travel Possible?
- D00dman
- · Replies 2 ·
Graduate Does Length Contraction Occur in All Directions for a Speeding Object?
- Dgonzo15
- · Replies 3 ·
Graduate General matrix representation of lorentz boost
- highwaychile
- · Replies 2 ·