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 Why would an infinite universe tend to contract?
- michelcolman
- · Replies 10 ·
Graduate Hypothetical spacecrafts traveling at light speed.
- Holocene
- · Replies 8 ·
Graduate Is the Speed of Light Truly Constant for All Observers?
- kbaumen
- · Replies 7 ·
Graduate The interior space-time metric for a rotating spherical star
- Gravitino
- · Replies 4 ·
Undergrad Twin Paradox: Explaining the Relativity of Aging
- the-genius
- · Replies 114 ·
Graduate Higgs Boson & Relativity: A Layman's Explanation
- The thinker
- · Replies 5 ·
Undergrad How Does Speed Affect Aging and Time Perception?
- hurricane89
- · Replies 1 ·
Undergrad Speed of light and mass increase
- Vals509
- · Replies 1 ·
Graduate So what if I was in motion and tried to measure my own mass?
- NWH
- · Replies 9 ·
Graduate Gravitational Time Dilation & Blueshift
- nutgeb
- · Replies 7 ·
Graduate Finding High Curvature Solution in GR to Einstein's Field Equations
- benk99nenm312
- · Replies 7 ·
Graduate Some questions,espacielly about time
- Dweirdo
- · Replies 16 ·
Graduate Flat vs Curved Spacetime: Are They Truly Equivalent?
- Naty1
- · Replies 10 ·
Undergrad Black Hole Thermodynamics Resources?
- montreal1775
- · Replies 2 ·
Undergrad Where does the energy come from in different frames of reference?
- Dweirdo
- · Replies 8 ·
Graduate Large bodies of mass and their effects on apparent time
- NWH
- · Replies 2 ·
Graduate Lorentz invariance versus Lorentz covariance in physics
- haaj86
- · Replies 5 ·
Graduate How is it that black holes are black?
- batman226
- · Replies 2 ·
Graduate Questioning dark matter and Reinventing Gravity
- DontPanic
- · Replies 15 ·
Graduate Why is the concept of proper acceleration important in General Relativity?
- earamsey
- · Replies 25 ·
Undergrad Why Does Density Increase When an Object Moves By?
- jgens
- · Replies 5 ·
Graduate Evaporating BH and infalling observers - I am puzzed
- Dmitry67
- · Replies 19 ·
Clocks & Boxcars: Get Solution to Problem
- Dreads
- · Replies 12 ·
Graduate Refraction & Special Relativity: Can Photons Convert to Mass?
- haloshade
- · Replies 1 ·
Graduate Understanding the Limitations of Faster-than-Light Travel in Physics
- fireman919
- · Replies 7 ·
Graduate What Does the Gravitomagnetic B-Field Describe and What Are Its Units?
- stubbypeeps33
- · Replies 2 ·
Graduate Can Objects Travel Faster Than the Speed of Light?
- sirsmokealot
- · Replies 2 ·
Graduate Gravitational lensing - 2 questions
- Dmitry67
- · Replies 1 ·
Graduate Understanding Time Dilation in Einstein's Special Theory of Relativity
- cos
- · Replies 297 ·
Graduate Simultaneous Paradox Explained - 65 Characters
- Dreads
- · Replies 26 ·
Graduate Schwarzschild's radius inquiry
- TheOneRaven
- · Replies 5 ·
Graduate Speed of light, propellent incease in mass?
- ThoughtProces
- · Replies 16 ·
Graduate What is the Fabric of Spacetime Made Of?
- Sammyg
- · Replies 110 ·
Graduate Degrees of freedom in the curvature tensor
- Orbb
- · Replies 1 ·
Graduate Math of relativistic space travel
- Ike47
- · Replies 42 ·
Graduate What is the relationship between free falling bodies and spacetime geodesics?
- FaithSeeker
- · Replies 9 ·
Graduate Variation of Einstein-Hilbert action
- jdstokes
- · Replies 10 ·
Graduate Can physical 3D space exist at all?
- p764rds
- · Replies 4 ·
Graduate After finding the Einstein Tensor
- Reedeegi
- · Replies 3 ·
What would a time machine look like?
- Jaxodius
- · Replies 29 ·
Graduate Does matter warp space time in the form of minimal surfaces?
- squidsoft
- · Replies 4 ·
Graduate Speed of light as an impossibility
- Vals509
- · Replies 9 ·
Graduate Uncovering the Equivalence of Energy and Mass: Visualizing E=MC2
- Chaos' lil bro Order
- · Replies 27 ·
Graduate Is Gravity Truly a Force or Merely a Curvature of Space-Time?
- Brilliant!
- · Replies 3 ·
Graduate Relativistic motion of a magnetic sail
- qraal
- · Replies 2 ·
Graduate Synchronising Clocks: Will They Stay in Sync?
- Dreads
- · Replies 1 ·
Graduate Is there inertial mass-gravity equivalece principle with photons?
- ensabah6
- · Replies 1 ·
Graduate How Do Tidal Forces Affect Objects Near Black Holes?
- Dmitry67
- · Replies 3 ·
Graduate Could GR generalized to non-integer dimension?
- zetafunction
- · Replies 8 ·
Graduate A question on velocity addition
- charlespune
- · Replies 6 ·
Graduate Is a length-contracted object shorter or longer than proper length?
- benk99nenm312
- · Replies 4 ·
Graduate Why Does Light Appear to Fall in a Gravitational Field?
- oldman
- · Replies 25 ·
Graduate Parametric Equation of a Sphere in General relativity
- Reedeegi
- · Replies 1 ·
Graduate How Does Gravitational Time Dilation Affect Light Emitted from a Black Hole?
- Naty1
- · Replies 4 ·
High School Why Time Can Be Negative: Understanding the Past & Present
- monty37
- · Replies 9 ·
Graduate Foliating Spacetime: Understanding the Curves and Metrics
- naima
- · Replies 2 ·
Graduate Is Einstein's Train Thought Experiment an Example of Backward Causation?
- pLatOscLoSET
- · Replies 20 ·
Graduate Diffeomorphism Invariance in Einstein's Gravitation Theory Explained
- eVulcanon
- · Replies 4 ·
Graduate What are Null Coordinates and Their Role in Spacetime?
- stevebd1
- · Replies 1 ·
Graduate The Alcubierre Drive and Negative Energy
- spock0149
- · Replies 1 ·
Einsteins General Relativity Papers- Original
- T.O.E Dream
- · Replies 3 ·
Graduate Does the CMB allow special rest frames to be defined?
- Spinnor
- · Replies 7 ·
Undergrad Question on gravitational time dilation
- thr33
- · Replies 2 ·
Graduate Stress energy tensor interpretation
- Naty1
- · Replies 2 ·
Graduate Einstein's Theory of Gravity Waves: Speed of Light
- Zman
- · Replies 2 ·
Graduate How Do Photon Journeys Affect Light Clock Synchronization in Relativity?
- neopolitan
- · Replies 12 ·
Graduate Moving light bulb sphere of photons
- Dreads
- · Replies 33 ·
Graduate How Does the Relativistic Doppler Effect Alter Light Frequencies?
- loup
- · Replies 12 ·
Graduate Black Holes and Gravitational Waves
- Magister
- · Replies 2 ·
Graduate Quantum mechanics vs. postulates of special relativity
- Heirot
- · Replies 8 ·
Graduate D'Inverno page 226 (tidal force on freely falling particle )
- shahram.t
- · Replies 2 ·
Graduate GR - time dialation at center of a planet
- rcgldr
- · Replies 4 ·
Graduate General Relativity vs. gravitons/force
- crschoen
- · Replies 1 ·
Graduate The difference between a metric and the metric tensor
- PhysicsGuy123
- · Replies 24 ·
Undergrad Do atomic clocks prove time dilation and length contraction?
- phys-lexic
- · Replies 2 ·
Graduate What Keeps A Black Hole Going?
- 3CKPilot
- · Replies 2 ·
Graduate Can the gravitational field create its own gravity?
- friend
- · Replies 13 ·
Graduate Is Lorentz Ether Theory a Viable Alternative to General Relativity?
- Tam Hunt
- · Replies 152 ·
Graduate Is there the possibility of absolute time
- G Hathaway
- · Replies 87 ·
Undergrad My little theory: what would happen?
- phylicity
- · Replies 3 ·
Undergrad Pass light through helium-3 it slows it down?
- ScienceNerd36
- · Replies 2 ·
Time and Motion: An Unbreakable Connection?
- phylicity
- · Replies 5 ·
Graduate How Does Lightbeam Motion Influence Our Perception of Time Dilation?
- nathan heiney
- · Replies 15 ·
Graduate Does time exist apart from matter?
- cristoper
- · Replies 19 ·
Graduate Time difference in relation to elevation
- protonic_mass
- · Replies 4 ·
Graduate Composition of Lorentz pure rotations
- amyadad
- · Replies 3 ·
Undergrad Length Contraction: Light & Spaceships
- Forestman
- · Replies 3 ·
Graduate Finding Orthonormal Bases for Metrics with Non-Zero Off-Diagonal Components
- emma83
- · Replies 9 ·
Graduate What is the Relationship Between Energy and Time in Different Frames?
- chewwy
- · Replies 3 ·
Graduate Rethinking Time: Is Our Perception of Time Just an Illusion?
- ebon
- · Replies 3 ·
Graduate Rotating rigid sphere stress-energy tensor
- aatw
- · Replies 4 ·
Graduate What Are the Key Concepts Behind Light Clocks and Light Velocity?
- Canaan_C
- · Replies 31 ·
A good video to help one understand time dilation
- Forestman
- · Replies 1 ·
Graduate Help: Mode Decomposition and Retarded Feilds and Green's functions
- zamoura
- · Replies 1 ·
Graduate Curvature using exterior differential forms
- emma83
- · Replies 1 ·
Graduate Relativistic version of 2nd law of thermodynamics
- Dmitry67
- · Replies 2 ·
Graduate How do we know that the stress-energy is a tensor?
- jdstokes
- · Replies 20 ·
Graduate Can a civilization gather information from inside the event horizon?
- spikenigma
- · Replies 7 ·
Graduate Modificaition in pole and barn paradox
- the-genius
- · Replies 12 ·
Graduate Time dilation: most recent & precise experiments
- lalbatros
- · Replies 12 ·