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 If the speed of light were zero
- WillBlake
- · Replies 5 ·
Graduate How does relative motion affect the speed of light?
- mtworkowski@o
- · Replies 27 ·
Graduate Gravitational time dilation from two or four bodies
- shalayka
- · Replies 7 ·
Graduate Third postulate of special relativity?
- zonde
- · Replies 13 ·
Graduate Why does pressure appear three times in the geodesic deviation equation?
- bunburryist
- · Replies 15 ·
Poincaré's 1900 paper on Lorentz's theory
- sal
- · Replies 13 ·
Graduate Gravitational Collapse: Is Mass Referring to Rest Mass?
- nomadreid
- · Replies 2 ·
Graduate Backscattering of light at a black hole
- MasterD
- · Replies 1 ·
Graduate Accelerations at various distances.
- g_sanguinetti
- · Replies 29 ·
Graduate How Does Relativity Change at High Velocities and Small Distances?
- devronious
- · Replies 2 ·
Undergrad Understanding Frames of Reference in Relativity
- H0T_S0UP
- · Replies 37 ·
Graduate Precession angle per orbit of perhelion precession mercury
- fakrudeen
- · Replies 1 ·
Graduate Could Gravity Be a Reaction to the Early Universe's Events?
- Niall Davids
- · Replies 1 ·
Undergrad Why are photons affected by gravity if they have no mass?
- pixel01
- · Replies 19 ·
Undergrad Why can't we go faster than 300,000 km/s?
- Desiree
- · Replies 20 ·
Graduate Matter travelling faster then light inside a black hole
- stragz
- · Replies 4 ·
Graduate Can two bodies receding at 0.7c each exceed light speed relative to each other?
- Namloh2000
- · Replies 13 ·
Graduate Frequency change of a photon falling to earth
- LHS1
- · Replies 7 ·
Undergrad Is there a fundamental difference between the three spatial dimensions?
- biophysics
- · Replies 1 ·
Graduate Question about exhaust velocity and terminal velocity
- rhz_prog
- · Replies 5 ·
Graduate About the accelerating spaceship
- snoopies622
- · Replies 17 ·
Graduate Symmetry in Travel and Time Dilation
- g_sanguinetti
- · Replies 7 ·
Graduate Matter tells matter how to move
- jonmtkisco
- · Replies 69 ·
Graduate Pole and Barn paradox - close the doors for good
- jtaravens
- · Replies 4 ·
Graduate Length contraction compression and Schwarzschild radius
- Ookke
- · Replies 10 ·
Graduate How did Einstein conclude that light travels at the same speed for all observers?
- mjolnir80
- · Replies 2 ·
Graduate Can Light's Speed be Considered Constant if it Can be Slowed Down?
- JSM
- · Replies 2 ·
Undergrad On the noton of reference frames force and acceleration
- calculus_jy
- · Replies 34 ·
Graduate Which expression for Relativistic Kinetic Energy is correct?
- rhz_prog
- · Replies 4 ·
Undergrad Causality Question: Is It Violated in This Scenario?
- fluidistic
- · Replies 2 ·
Undergrad Why Is 'c' Used for the Speed of Light in E=mc²?
- Blackadder
- · Replies 3 ·
Undergrad Why does light not pass through voids within atoms?
- azzkika
- · Replies 5 ·
Graduate Why can't gravity accelerate an object past c?
- Sbratman
- · Replies 17 ·
High School Speed of Light. What is c? Why use the letter c'?
- artie
- · Replies 46 ·
Graduate Determination of Riemann curvature tensor from tidal forces
- jdstokes
- · Replies 4 ·
Undergrad Have the gravity waves been detected from the big bang?
- azzkika
- · Replies 1 ·
Graduate How Can I Find a GR Problem Comparable to a QED Cross-Section Calculation?
- jdstokes
- · Replies 14 ·
Graduate Photons that orbit at the event horizon.
- Primordial
- · Replies 10 ·
Graduate Does space expansion theory obey relativity laws?
- azzkika
- · Replies 3 ·
Graduate Special relativity and apparent, actual and synchronized positions
- bernhard.rothenstein
- · Replies 1 ·
Undergrad Can information travel faster than light?
- Mafarazzo
- · Replies 64 ·
Graduate Are There Theories Challenging the Conservation of Energy Law?
- raptor5618
- · Replies 3 ·
Graduate Charged particle at relativistic velocity
- Privalov
- · Replies 8 ·
Graduate Einstein's resolution of the clock paradox
- Al68
- · Replies 32 ·
Why Does light have a speed limit.?
- krom
- · Replies 37 ·
Graduate How to distinguish fictitious forces from real forces
- calculus_jy
- · Replies 14 ·
Graduate Round trip (two way) speed of light
- bernhard.rothenstein
- · Replies 7 ·
Graduate Universal Reference point in time
- Chaos' lil bro Order
- · Replies 2 ·
Graduate How does cosmic inflation faster than light speed comply with relativity?
- Denton
- · Replies 1 ·
Graduate Orbiting Time Dilation: Who is Younger?
- g_sanguinetti
- · Replies 9 ·
Graduate Speed of C in all frames of reference
- shamrock5585
- · Replies 15 ·
Graduate Do All Masses Exhibit Schwarzschild Singularities?
- supakorn
- · Replies 1 ·
Undergrad Does reflected light make an object appear older than a light source at the same distance?
- Green Zach
- · Replies 9 ·
Undergrad How Long for a 186,000-Mile Rod to Move?
- coolpup32
- · Replies 5 ·
Undergrad Can observer C see light from both sources reaching B simultaneously?
- novice2000
- · Replies 6 ·
Graduate A question on why Special Relativity holds
- thenava
- · Replies 7 ·
Graduate Infinite Tensor: Does Coordinate System Matter?
- snoopies622
- · Replies 9 ·
Graduate Identifications between the model and the real world
- Fredrik
- · Replies 5 ·
Graduate Gravitational force = inertial mass
- raptor5618
- · Replies 5 ·
Graduate What does a comoving observer measure for rocket acceleration?
- yuiop
- · Replies 10 ·
Graduate SR's Length Contraction and Time Dilation
- epkid08
- · Replies 4 ·
Graduate How Does Mass Increase Affect Proton Velocity in a Cyclotron?
- tuananh3ap
- · Replies 2 ·
Graduate Spinning at the speed of light?
- RunSwimSurf
- · Replies 1 ·
Graduate Where does the ux/c² term come from in the Lorentz transformation?
- PatPwnt
- · Replies 18 ·
Graduate How Does Time Dilation Affect Measurements of Earth's Size from Satellites?
- Zman
- · Replies 1 ·
Undergrad Understanding Light as a Particle and Wave
- supersmiffy26
- · Replies 5 ·
Graduate Stress energy tensor of a rotating hoop
- jdstokes
- · Replies 14 ·
Graduate Can gravitational waves escape a black hole?
- fedaykin
- · Replies 7 ·
Graduate Is Simultaneity Absolute in the Train-Platform Thought Experiment?
- calculus_jy
- · Replies 6 ·
Graduate Can mass go faster than the speed of light?
- spiffomatic64
- · Replies 63 ·
Graduate Is Kronecker Delta a Coordinate-Independent Identity Operator?
- jdstokes
- · Replies 6 ·
Do you support Einstein's theory of relativity and why?
- the doctor
- · Replies 5 ·
Graduate Why do physicists search for gravitons if general relativity explains gravity?
- math_04
- · Replies 35 ·
Graduate What scientific experiments have been invalidated by extinction phenomena?
- mtworkowski@o
- · Replies 1 ·
Undergrad NASA's Stance on Warp Drive: Could FTL Travel Be Possible?
- KilltheElite
- · Replies 3 ·
Graduate What doesn't have gravitational mass?
- Usaf Moji
- · Replies 2 ·
Graduate What is the Wedge Product and How is it Defined?
- jdstokes
- · Replies 3 ·
Graduate Frequency shift of light between observers in Schwarzschild space-time
- Mentz114
- · Replies 1 ·
Undergrad (special) relativistic effects made clear in animation
- Thanaton
- · Replies 1 ·
Graduate How Does the Unruh Effect Differ Between Observers in Motion and at Rest?
- nrqed
- · Replies 9 ·
Graduate What is the Classical Pendulum Paradox?
- Shenckel
- · Replies 28 ·
Graduate Converting Geometrized Units: The Role of G and c in Christoffel Symbols
- snoopies622
- · Replies 5 ·
Graduate Can an electron beam in a TV tube move faster than light?
- jk4
- · Replies 14 ·
Graduate Why Are Two Indices Used for the Generators of Lorentz and Poincare Groups?
- Bobhawke
- · Replies 1 ·
Graduate Can Pulsed Gravity Waves Be Used for Faster-Than-Light Communication?
- netjim66
- · Replies 9 ·
Graduate How Does Rotation Affect Gravity and Relativity Perception?
- uncommonsense
- · Replies 4 ·
Graduate Two men in adjacent rockets after fast revolutions: who ages less?
- ankitpandey
- · Replies 40 ·
Graduate How often does mass effect space
- Nacho
- · Replies 8 ·
Graduate Relativistic mass and space-time curvature
- redtree
- · Replies 10 ·
Undergrad What would I observe traveling at 0.5c and how would others see me?
- glueball8
- · Replies 13 ·
High School Is the speed of light a constant
- smurfcatcher
- · Replies 32 ·
Graduate Is Light's Speed Limit Universal for All Massless Particles?
- LongOne
- · Replies 13 ·
Graduate A Thought Experiment with Time Dilation
- chemiker
- · Replies 2 ·
Graduate Why does an infalling object cross the event horizon in finite proper time?
- Wizardsblade
- · Replies 34 ·
Graduate Is Special Relativity Based on Human Error?
- epkid08
- · Replies 24 ·
Graduate Would Gravity Waves Show Doppler Shift?
- peter0302
- · Replies 10 ·
Graduate Is Spherically Symmetric Spacetime Algebraically Special?
- afs
- · Replies 1 ·
Graduate Does the metric really represent intrinsic spacetime in plain English?
- atyy
- · Replies 3 ·
Graduate Does spaceship B accelerate immediately when tether is released?
- netjim66
- · Replies 16 ·
Graduate Calculating Angular Distance in SR
- yuiop
- · Replies 5 ·