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 A little paradox in relativity.
- rpj
- · Replies 24 ·
Graduate Why does a relativistic tramwheel leave marks spaced differently than expected?
- Rasalhague
- · Replies 3 ·
High School Is the speed of light a velocity or acceleration?
- ryuunoseika
- · Replies 18 ·
Graduate Why is faster than light travel so bizarrely 'addressed'
- Roo
- · Replies 47 ·
Graduate Magnetic Relativity: Does a Force Act?
- tickle_monste
- · Replies 7 ·
Graduate Why Does the Twin Paradox Not Prove Einstein's Relativity Wrong?
- nuclear420
- · Replies 3 ·
Graduate What exactly is meant when people say that a Light Cone is tilting ?
- Benjamin113
- · Replies 6 ·
Graduate What is the Relationship Between Proper Time and Coordinate Time in Black Holes?
- rjbeery
- · Replies 103 ·
Graduate Is there time at the speed of light?
- Gothican
- · Replies 17 ·
Undergrad Gravitational Force between two bodies when Distance is zero
- nvijayprakash
- · Replies 9 ·
Graduate The Relativity of Simultaneity
- Gear300
- · Replies 22 ·
Graduate Is the Kretschmann scalar zero only in flat spacetime?
- Cusp
- · Replies 3 ·
Graduate What Are the Limitations of the Balloon Analogy in Cosmology?
- thehangedman
- · Replies 4 ·
Graduate Twistors but I don't think his projection created a compacted space
- thehangedman
- · Replies 4 ·
Graduate Electromagnetic General Relativity
- The_Duck
- · Replies 18 ·
Time Travel Theory: What Are Your Thoughts?
- espen180
- · Replies 1 ·
Graduate How Light Travels Across Space at Velocity C
- DB Katzin
- · Replies 6 ·
Graduate Can a wormhole cause time to slow down and age differently for travelers?
- Teeril
- · Replies 15 ·
Graduate General theory of relativity space without ether is unthinkable
- joychandra
- · Replies 9 ·
Graduate Understanding the Stress-Energy Tensor
- Fubini
- · Replies 7 ·
Graduate Constant velocity vs accelerating source
- brightonb
- · Replies 5 ·
Graduate Why isn't gravity the result of a variable speed of light?
- marlowgs
- · Replies 9 ·
Graduate EPR Paradox and implications for QM
- trv
- · Replies 4 ·
High School A question about special relativity,
- hippopviolin
- · Replies 15 ·
Undergrad Gravity and Energy: Mass, Velocity, and More
- joychandra
- · Replies 2 ·
Graduate What is the definition of a metric tensor?
- muzialis
- · Replies 3 ·
Undergrad Why Does Length Contraction Happen?
- Atlaπtis
- · Replies 2 ·
Undergrad How Is the Inner Radius of an Accretion Disc Determined?
- tiny-tim
- · Replies 1 ·
Undergrad Can the Twin Paradox Be Proven?
- jontyjashan
- · Replies 2 ·
Undergrad Why Can't There Be Gravity in 2 Spatial Dimensions?
- lolgarithms
- · Replies 2 ·
Undergrad What is the cosmological constant and how does it relate to the Higgs boson?
- monty37
- · Replies 7 ·
Graduate A dark part of special relativity(at least for me)
- ShayanJ
- · Replies 28 ·
Graduate Schwarzschild vs FRW: why does mass increase negative vs positive spatial curvature?
- nutgeb
- · Replies 1 ·
Graduate Effect before Cause:absolute horizon
- Naty1
- · Replies 10 ·
Graduate SRT two observers will agree on their relative velocity
- 0xDEADBEEF
- · Replies 4 ·
High School Physics Q: Time If Everything Stops Except Clock?
- deathstar
- · Replies 2 ·
Graduate Vectors and the Speed of Light?
- ryuunoseika
- · Replies 3 ·
Graduate Why doesn't d/dt(γm₀v) give F=ma in special relativity?
- Gwenne
- · Replies 1 ·
Graduate What Defines Unstable Versus Unbound Orbits Around Black Holes?
- emma83
- · Replies 3 ·
Graduate How Does Space Motion Affect Light Measurement Observations?
- Dreads
- · Replies 2 ·
Graduate A different take on the Schwarzschild Metric
- DiamondGeezer
- · Replies 2 ·
Graduate How does time dilation really work?
- Negatratoron
- · Replies 17 ·
Graduate Explaining weak equivalence principle from fundamental particle composition
- JK423
- · Replies 25 ·
Graduate Breaking Light and Einstein-Rosen Bridges?
- ryuunoseika
- · Replies 3 ·
Graduate Are there other Lorentz invariant bilinear combinations of E and B?
- jsc01
- · Replies 9 ·
High School Will twins age differently if one stays on Earth and one travels at light speed?
- johncena
- · Replies 24 ·
Graduate Understanding Length Contraction and Time Dilation
- DuckAmuck
- · Replies 10 ·
Graduate Time dilation for constant 10 G acceleration across 70,000 light years
- Anticitizen
- · Replies 9 ·
Graduate Photon/particle's energy in General Relativity
- coccoinomane
- · Replies 7 ·
Graduate Faster than the speed of light with only a fishing line
- jamesbird
- · Replies 2 ·
Graduate Role of Exclusion principle in formation of black holes.
- aaryan0077
- · Replies 1 ·
Graduate Reduced density matrices and Lorentz transformation
- emma83
- · Replies 1 ·
Graduate What is a Rank 3 Tensor and Why Does It Matter?
- plxmny
- · Replies 16 ·
Undergrad The beautiful sight of the interstellar traveller
- Bouh
- · Replies 8 ·
Graduate Does the presence of B change the velocity of C with respect to A?
- O Great One
- · Replies 6 ·
Graduate Is Proper Time Invariance Proven?
- thoughtgaze
- · Replies 3 ·
Graduate Can't get time dilation to add up
- lauge
- · Replies 11 ·
Graduate Is the behavior of light that remarkable?
- DB Katzin
- · Replies 26 ·
Graduate What are some potential topics for a FAQ on the Twin Paradox?
- neopolitan
- · Replies 2 ·
Graduate What is time? Is it an imaginary thing?
- ngjingyi
- · Replies 2 ·
Graduate Einstein field equations (EFE's)
- Petenerd
- · Replies 1 ·
Graduate Theories of relativity and the resulting E = MC^2
- LitleBang
- · Replies 3 ·
Graduate Neutron Stars and Special Relativity
- Hao
- · Replies 2 ·
Undergrad Traveling at Near-Light Speed: Time Dilation and Your Perspective Explained
- csnsc14320
- · Replies 11 ·
Graduate The Photon's Perspective Taboo
- OB 50
- · Replies 45 ·
Graduate Sending particles backwards in time with laser beams
- hodges
- · Replies 2 ·
Graduate Relativistic Mass and Energy Convservation
- ryuunoseika
- · Replies 4 ·
Graduate Do Gravity Waves and Light Waves Follow the Same Paths in Space-Time?
- gonegahgah
- · Replies 7 ·
Undergrad How Can a Simple Laser Pointer Cause Destruction at Light Speed?
- gonegahgah
- · Replies 25 ·
High School Tracing the Passage of Time: Is It Possible?
- monty37
- · Replies 7 ·
Graduate Most basic of thought experiments in special relativity
- Kokone
- · Replies 21 ·
Graduate Large Scale Structure of Spacetime Study Group
- clejan
- · Replies 4 ·
Graduate Solving Tricky Pauli Matrices with Einstein Notation
- emma83
- · Replies 5 ·
Graduate Is Time Variable When Light is Constant?
- catawampous
- · Replies 1 ·
Graduate How does light slow in the presence of gravity?
- Naty1
- · Replies 56 ·
Undergrad Can flying near light speed reverse time like in Superman?
- Mentallic
- · Replies 28 ·
Undergrad Rod spinning with tip approaching light speed
- JukuJohannes
- · Replies 12 ·
Undergrad Why do we need to see gravitation as force?
- Dex
- · Replies 1 ·
Graduate Need help understanding an equation
- assafwei
- · Replies 4 ·
Graduate Can Time Exist Without Mass or Energy in Space?
- cragar
- · Replies 10 ·
Graduate Does relativistic mass increase affect momentum conservation in collisions?
- LennoxLewis
- · Replies 6 ·
High School What causes time to move?
- Stratosphere
- · Replies 3 ·
Graduate Are proper travel distances contracted by SR?
- nutgeb
- · Replies 14 ·
Graduate Do observers in different frames disagree on a bullet's mass?
- abccbaabc014
- · Replies 2 ·
High School Mass + potential kinetic energy
- thornza
- · Replies 8 ·
High School Teaching 7th Graders About Black Holes
- Reedeegi
- · Replies 2 ·
Graduate Spacetime Translational Invariance vs(?) Lorentz Covariance
- tiyusufaly
- · Replies 1 ·
Undergrad Doppler Effect on Light: Understanding Red and Blue Shifts in Galaxies
- mach990
- · Replies 2 ·
Graduate Feynman's perihelion of mercury calculation using field theory
- CarlB
- · Replies 1 ·
Graduate Why does Hawking radiation prefer antiparticles to the black hole?
- michelcolman
- · Replies 20 ·
Graduate How Do You Calculate a 2D Null Geodesic in the Presence of a Gravitational Mass?
- haytil
- · Replies 1 ·
Undergrad Can you be weightless in a shielded underground room?
- satelliteguy
- · Replies 46 ·
Graduate Close to light speed visualization question
- rlinsurf
- · Replies 9 ·
Graduate What Distinguishes a Free-Falling Frame from a Fermi-Walker Frame?
- emma83
- · Replies 1 ·
History of Gravity: A Brief Overview from Antiquity to 20th Century
- Reedeegi
- · Replies 1 ·
Graduate Interpretation of spacetime diagrams.
- matheinste
- · Replies 8 ·
Graduate How fast to go 1000 years into the future
- rlinsurf
- · Replies 11 ·
Undergrad Does gravitational lensing affect distance measurements to stars?
- TimP
- · Replies 9 ·
Graduate DeBroglie and Time Dilation Paradox
- DuckAmuck
- · Replies 3 ·
Graduate Axxis Movement: Lorentz Transformation
- karkas
- · Replies 1 ·