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
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 Cosmological Constant: Significance & "God" Particle
- monty37
- · Replies 7 ·
Graduate A dark part of special relativity(at least for me)
- ShayanJ
- · Replies 28 ·
Graduate Spatial curvature in Schwarzschild & FRW
- 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 Understanding Relativity: Explaining Inertial Mass and the Speed of Light
- 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 An idea on explaining the weak equivalence principle
- 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 Ages of A & B: Unbelievable Difference?
- johncena
- · Replies 24 ·
Graduate Understanding Length Contraction and Time Dilation
- DuckAmuck
- · Replies 10 ·
Graduate Help with a really nerdy calculation?
- 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 Send Particle Backwards in Time - Is this a hoax?
- 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 Superman and Time Travel: Is It Possible?
- Mentallic
- · Replies 28 ·
Undergrad Confused in a thought-experiment
- 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 Question about SR and increasing mass
- LennoxLewis
- · Replies 6 ·
High School So, sorry for asking a stupid question.What causes Time to Move?
- Stratosphere
- · Replies 3 ·
Graduate Are proper travel distances contracted by SR?
- nutgeb
- · Replies 14 ·
Graduate Kinetic Energy & Relativity: E=mc^2
- 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 Hawking radiation: why only one way?
- michelcolman
- · Replies 20 ·
Graduate How Do You Calculate a 2D Null Geodesic in the Presence of a Gravitational Mass?
- haytil
- · Replies 1 ·
Undergrad Weightless in a Shielded Room: Does Gravity Still Apply?
- 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 Beginner's question on bending of space time and measuring distance to stars
- TimP
- · Replies 9 ·
Graduate DeBroglie and Time Dilation Paradox
- DuckAmuck
- · Replies 3 ·
Graduate Axxis Movement: Lorentz Transformation
- karkas
- · Replies 1 ·
Graduate Questions on Gravity: Wavelength, Frequency, Effects
- jobyts
- · Replies 5 ·
Graduate Does spacetime curvature of EM field affect zero-charge particles?
- splur
- · Replies 1 ·
Undergrad Can Time Travel Create Paradoxes?
- BadFish
- · Replies 13 ·
Graduate Gravitational waves adn Black holes frequency
- supakorn
- · Replies 4 ·
Graduate Who Truly Experiences Slower Time in the Paradox of Time Dilation?
- p.tryon
- · Replies 175 ·
Undergrad What is the Relationship Between Speed of Light and Time?
- dannyPhysics
- · Replies 15 ·
Graduate Quantum Gravity: Reconciling General Relativity & QFT
- ilocar
- · Replies 10 ·
Undergrad I was wondering why Einstein picked C for this equation.
- sunblock
- · Replies 14 ·
Graduate Relativity of distances/lengths
- jaredmt
- · Replies 1 ·
Graduate What is the difference between proper time and coordinate time in relativity?
- monty37
- · Replies 12 ·
Graduate Using a computer to calculate Einstein tensor etc.
- Mosis
- · Replies 3 ·
Graduate Solving Matrix Equations in SL(2,C) for Arbitrary Vectors
- emma83
- · Replies 5 ·
Graduate Understanding de Sitter Space: FRW or Hyperboloid?
- ramparts
- · Replies 3 ·
Undergrad How do you prove that the speed of light is absolute
- Gigahurtz
- · Replies 13 ·
Graduate Is there a Space-Time Curvature equation?
- tgramling
- · Replies 15 ·