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.
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Graduate Black holes , gravity upper limit
- Crazymechanic
- · Replies 4 ·
Graduate Recommendaton for Clarifying Special Relativity
- bobc2
- · Replies 124 ·
Graduate Formulating Position Vector with f(t)
- Philosophaie
- · Replies 2 ·
Graduate Can Observers See the Future in Relativity?
- analyst5
- · Replies 15 ·
Graduate Finding the 4x4 Cofactor of a Covariant Metric Tensor g_{ik}
- Philosophaie
- · Replies 1 ·
Graduate Does charge conservation follow from Maxwell's equations in curved spacetime?
- Infrared
- · Replies 5 ·
Graduate Reconciling APOD BH Videos w/ Physics Forums Discussion
- anorlunda
- · Replies 1 ·
Graduate Classification of Gravitational Theories
- sadegh4137
- · Replies 2 ·
Graduate Why do objects fall through curvature of spacetime?
- SteveDC
- · Replies 1 ·
Graduate Is a Topological Action Defined by the Underlying Space?
- Raifeartagh
- · Replies 1 ·
Graduate Singularity Mechanics? Blackhole Spin
- TWest
- · Replies 20 ·
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 What is spacetime and how does it relate to E=mc²?
- 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 Why does length contraction give x=375m instead of less than 300m?
- medwatt
- · Replies 4 ·
Graduate How do photons move relative to each other in special relativity?
- 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 Why does a particle gain momentum as its velocity increases?
- Saado
- · Replies 4 ·
Graduate Does your clock slow down at rest or in motion?
- 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 Einstein's relativity of simultaneity in chapter 9 of Relativity
- 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 Can an observer avoid Doppler shifts from distant sources during a massive flyby?
- 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 Proving smoothness and future orientation in Wald lemma 8.1.1
- WannabeNewton
- · Replies 4 ·
Graduate Difference between black hole solutions and wormhole solutions
- extrads
- · Replies 2 ·
Graduate Can two colliding black holes create a region where time goes backward?
- 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 Why do light rays bend inside an accelerating spaceship?
- 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 Does pushing a light-year-long rod transmit information instantaneously?
- LazerStallion
- · Replies 25 ·
Graduate Can metric tensor components be complex functions?
- 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 Relativistic effects in fluid model of accelerated electrons and ions
- qqqppp
- · Replies 1 ·
Graduate Error in Carroll's Lecture Notes on General Relativity pg. 186
- maxverywell
- · Replies 1 ·
Graduate Why does photon arrival rate increase in the Doppler effect?
- Alfred Cann
- · Replies 37 ·