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 Cosmological Constant and Planck Length in relativity
- Naty1
- · Replies 7 ·
Graduate Lengths perpendicular to relative motion are unchanged
- Mosis
- · Replies 1 ·
Graduate Relativistic Angular Momentum?
- LarryS
- · Replies 1 ·
Why hasn't the world's first time machine documentary led to anything?
- leroyjenkens
- · Replies 3 ·
Undergrad When does Newton's Gravitation fail us?
- physicsdude30
- · Replies 16 ·
Graduate Does the lead photon stay at distance c×t from a moving emitter?
- keepitmoving
- · Replies 14 ·
Graduate Question's About the Speed of Light
- Gecko
- · Replies 7 ·
Graduate How Does Traveling at .9999c Affect Human Time Perception?
- nuby
- · Replies 29 ·
Graduate What sort of vector is this?
- pellman
- · Replies 5 ·
Graduate Ampere's Law: Questions from E.M. Purcell's Textbook
- exmarine
- · Replies 5 ·
Graduate Superluminal transfer of information via gravity
- crapola77
- · Replies 6 ·
Graduate Electric is Magnetic - Relativistically speaking
- DavidFi
- · Replies 10 ·
Graduate Lorentz Generators, Srednicki eq. 2.13
- malawi_glenn
- · Replies 2 ·
Graduate Black Hole Horizon Information
- Naty1
- · Replies 6 ·
Graduate Crossing event horizon and Hawking radiation
- John.G.Cleary
- · Replies 2 ·
Graduate Where do extra vibrations come from in blueshift?
- keepitmoving
- · Replies 10 ·
Undergrad Does light become matter if you travel alongside it at c?
- crapola77
- · Replies 11 ·
Graduate Superluminal recession velocities and black hole event horizons
- nutgeb
- · Replies 15 ·
Graduate SR and classical Doppler shift
- nutgeb
- · Replies 35 ·
Undergrad Is spacetime like rubber, and does stretching explain time dilation and gravity?
- ledzeppie
- · Replies 9 ·
Graduate Time Dilation, who is aging slower?
- ajward
- · Replies 10 ·
Graduate Can a curvature meter show nonzero values in a local inertial frame?
- Neitrino
- · Replies 8 ·
Undergrad Understanding Gravitational Potential in Different Reference Frames
- itwillend
- · Replies 19 ·
Graduate The Truth About Time Travel: Separating Fact from Fiction
- ledzeppie
- · Replies 1 ·
Graduate Can gravity be unified with other forces if GR explains it as spacetime curvature?
- earamsey
- · Replies 24 ·
Graduate Relativistic Mass Increase and Its Dependence on Relative Speed
- keepitmoving
- · Replies 20 ·
Graduate Does time speed up as space expands
- T.O.E Dream
- · Replies 15 ·
Graduate Speed increases mass, which increases gravity?
- ledzeppie
- · Replies 3 ·
Graduate The visible universe and the speed of light
- silentpundit
- · Replies 1 ·
Undergrad Earths rotation and special relativity
- git67
- · Replies 7 ·
Graduate Problem with Rubber and Metal Ball Analogy
- jdeboi
- · Replies 3 ·
Graduate Relativity Theory and Quantum Theory
- Gear300
- · Replies 7 ·
Graduate What are the implication of Einstein's definition of space time?
- ArielGenesis
- · Replies 8 ·
Graduate Simultaneity, does it confuse causality?
- Brin
- · Replies 10 ·
Graduate Speed of light from two spaceships moving toward and away from Earth
- keepitmoving
- · Replies 1 ·
High School Does gravity pull towards a point behind an object or its center of gravity?
- Chatt
- · Replies 19 ·
Undergrad Is Time Influenced by Mass and Matter?
- Timmaay322
- · Replies 39 ·
Graduate What is Feynman's excess radius for a black hole?
- heinz
- · Replies 2 ·
Graduate How do gravitons relate to spacetime warping and extra dimensions?
- keepitmoving
- · Replies 5 ·
Why did Einstein win the Nobel Prize for the photoelectric effect instead of relativity?
- Stratosphere
- · Replies 4 ·
Graduate Is there an analytical explanation for Einstein's famous equation E=mc^2?
- Urmi Roy
- · Replies 7 ·
Graduate Can Gama Rays Escape a Black Hole?
- Tompuckett
- · Replies 4 ·
Graduate Do white holes violate the second law of thermodynamics?
- Petkovsky
- · Replies 1 ·
Graduate Lorentz transformations derived using dimensional analysis?
- jason12345
- · Replies 3 ·
Graduate Why use time dilation and length contraction together in relativity?
- neopolitan
- · Replies 444 ·
Graduate Time dilation effects on spinning object
- awcrowe
- · Replies 1 ·
Graduate Does mass cause gravity through time dilation?
- Boeley
- · Replies 1 ·
Graduate Horizon for Constant Acceleration - Special Relativity
- heinz
- · Replies 3 ·
Graduate Why does the equivalence principle allow different Riemann tensor measurements?
- skippy1729
- · Replies 17 ·
Graduate Are Time-Traveling Photons a Real Scientific Concept?
- gonegahgah
- · Replies 13 ·
Graduate Behavior of a tangent light beam to an event horizon?
- SW VandeCarr
- · Replies 5 ·
Graduate Electromagnetic version of the positive energy theorem?
- schieghoven
- · Replies 1 ·
Graduate Derivation of Wormhole Mouth Mass/Charge?
- Julian M
- · Replies 18 ·
Graduate Speedy ship flies through the sun
- Buckethead
- · Replies 13 ·
Graduate Conceptual GR question (regarding orbit paths)
- Matterwave
- · Replies 5 ·
Undergrad Special Relativity Time Travel to Future - Could You Watch the News on Earth?
- edgepflow
- · Replies 2 ·
High School Gravity reaches across space and apparently reaches across time.
- keepitmoving
- · Replies 9 ·
Graduate Mass warping time, question/ interpretation
- kmv
- · Replies 6 ·
Graduate Can Artificial Gravitational Fields Create Wormholes for Space Travel?
- The_Absolute
- · Replies 4 ·
Graduate The trivial constant force acceleration math
- valjok
- · Replies 3 ·
Undergrad How to explain E=mc² to 14-year-olds simply
- AlisonArulia
- · Replies 22 ·
Graduate What does the circular distortion in the center of a Penrose diagram represent?
- benk99nenm312
- · Replies 1 ·
Undergrad Why does light travel at the same speed in moving reference frames?
- Beetroot
- · Replies 12 ·
Graduate Deriving Einstein's field equations from the gravitational action
- zhushualbert
- · Replies 3 ·
Graduate Twin Paradox (I know not again)
- Libohove90
- · Replies 2 ·
Graduate What Happens to Light When a Flashlight Hits an Asteroid?
- keepitmoving
- · Replies 5 ·
Graduate The doppler radar trap paradox on the path to gravity.
- andrewr
- · Replies 108 ·
Graduate Does an observer on a carousel see a horizon?
- heinz
- · Replies 4 ·
Graduate Are Scientific Equations Only Valid for Certain Scales in Physics?
- putongren
- · Replies 1 ·
Undergrad A thing that confuses me (quasi-paradox)
- The_AC
- · Replies 8 ·
Graduate Significance of Special Relativity
- Oscar Wilde
- · Replies 6 ·
Graduate How Does Earth's Curvature Affect the Ratio of Gravity?
- Kingarthur
- · Replies 2 ·
Undergrad What causes the gravitational redshift phenomenon?
- eVulcanon
- · Replies 5 ·
Graduate Gravity: Time Dilation or Death
- Good4you
- · Replies 2 ·
Graduate Why do all observers measure the same speed of light?
- Saw
- · Replies 15 ·
Graduate Is General Relativity Based on General Relativity or Equivalence?
- eVulcanon
- · Replies 4 ·
Undergrad From Kepler's law to gravitation force
- Mesmerized
- · Replies 7 ·
Graduate Does a moving observer measure photon speed as c or c-v?
- EV33
- · Replies 2 ·
Undergrad When was time first considered a dimension?
- karkas
- · Replies 3 ·
Graduate Compact Sapcetime and Time Travel
- thehangedman
- · Replies 5 ·
Graduate Are Time and Space Independent of Objects?
- Gear300
- · Replies 13 ·
Graduate Is Gravity Truly a 3D Phenomenon?
- Tommahawk
- · Replies 1 ·
Graduate How Do FRW Coordinates Transform SR Effects in Cosmology?
- nutgeb
- · Replies 56 ·
Undergrad How does gravitational time dilation enable time travel?
- valdar
- · Replies 42 ·
Undergrad How do we know gravity bends light and not just refraction from the sun's atmosphere?
- michael879
- · Replies 53 ·
Graduate Verify special relativity by concept light clock
- Mark1991
- · Replies 18 ·
Graduate Is speed of time c, atleast for someone travelling at speed of light?
- aaryan0077
- · Replies 3 ·
Graduate Can We Really Travel Back to Our Own Past?
- aaryan0077
- · Replies 1 ·
Graduate Lorentz transformation in terms of hyperbolic angle for (2+1) dimensions
- touqra
- · Replies 7 ·
Graduate The Twin Paradox and Absolute Reference Frames in General Relativity
- CJames
- · Replies 5 ·
Graduate What Are the Paradoxes of Special Theory of Relativity?
- neurobio
- · Replies 7 ·
Graduate Kerr metric, singularities in Boyer-Lindquist and Cartesian coordinates
- redmosquito
- · Replies 1 ·
Undergrad Why Do We Use Arbitrary Units for the Speed of Light?
- stimulus101
- · Replies 10 ·
Graduate Principle of Relativity and Constancy of Light
- Gear300
- · Replies 24 ·
Graduate How does accelerating a wormhole mouth create a time shift?
- Jackson Tan
- · Replies 6 ·
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 ·