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
Undergrad Faster Than Light Travel: Wormhole Questions
- Bob Porter
- · Replies 3 ·
Undergrad Time travel thought experiment
- Shayne T
- · Replies 12 ·
High School Travel Faster than Light? Opposite Direction Objects
- mav_sd_
- · Replies 1 ·
High School Was H.G. Wells' Concept of Time as a Fourth Dimension Accurate?
- Shawn Robinson
- · Replies 7 ·
Graduate Analogy of counterterms of gauge in GR
- bluecap
- · Replies 17 ·
Undergrad Is Photon Mass Zero or Relativistic in Nature?
- Garlic
- · Replies 27 ·
Undergrad How would the sky look if ether drag hypothesis was true?
- weezy
- · Replies 5 ·
Undergrad Traveling at what fraction of light speed to cross the known universe in 80 years?
- Shayne T
- · Replies 12 ·
Graduate How Do Conservation Laws Apply to a 4 Current in General Relativity?
- fengqiu
- · Replies 2 ·
High School Does relativistic time dilation affect satellite signal frequency?
- InquiringMind
- · Replies 10 ·
Graduate Is There a Mathematical Definition of Time?
- Arjun Wasan
- · Replies 14 ·
Undergrad Why isn't spacetime considered as true 4D?
- Akriel
- · Replies 22 ·
Undergrad Are many exercises in Schutz just too hard?
- epovo
- · Replies 3 ·
Undergrad Why does Einstein say free fall and acceleration are different in non-inertial frames?
- TheWonderer1
- · Replies 3 ·
Undergrad If you traveled towards a planet at 0.9C
- victorhugo
- · Replies 18 ·
High School Why gravitational force is attractive? (and why dark matter is repulsive?)
- parshyaa
- · Replies 10 ·
High School Mutual time dilation seems to be self-contradictory?
- victorhugo
- · Replies 6 ·
High School Velocity dependent equations and frames of reference
- victorhugo
- · Replies 11 ·
Graduate Singularity After Black Hole Evaporates: What Happens?
- Rishi Tharun
- · Replies 2 ·
High School Can Spacetime Truly Have an Outside?
- fanieh
- · Replies 5 ·
Graduate Time Independent Form of Klein Gordon Eqn.: How to Reach (gδ3(x))
- Mohanraj S
- · Replies 3 ·
High School Need an explanation for the chances in this graph
- Meerio
- · Replies 1 ·
High School Manipulating Gravity: Is It Possible?
- wolram
- · Replies 5 ·
Graduate When a mass enters or leaves a wormhole mouth is momentum transferred
- harrylentil
- · Replies 18 ·
High School What Einstein said on faster than light travel
- EricjamesCADstudent
- · Replies 8 ·
Graduate Rest, Mass, and Kinetic Energy
- energeticringleader
- · Replies 3 ·
Undergrad Can Hyperbolic Space be affecting our view of the universe?
- particlezoo
- · Replies 18 ·
Undergrad Arrow of time and travel at the speed of light
- BernieM
- · Replies 36 ·
Undergrad Closing distances at rates greater than c
- clm222
- · Replies 1 ·
Undergrad Is time rate getting faster with cosmic expansion?
- Gerinski
- · Replies 14 ·
Undergrad Time dilation (something seemingly paradoxical)
- Joker93
- · Replies 13 ·
Graduate How Does Mach's Principle Connect Distant Stars to Local Motion?
- CyberShot
- · Replies 42 ·
Undergrad Force on a Spherically-Uniform Radiator Moving Through Space
- particlezoo
- · Replies 18 ·
Undergrad How Is Proper Acceleration Expressed in General Relativity?
- novice_hack
- · Replies 4 ·
Undergrad Gravity Waves: Measure Spacetime Stretch with a Ruler
- Albertgauss
- · Replies 3 ·
Undergrad Which Is More Fundamental: Time or Distance?
- Albertgauss
- · Replies 2 ·
Graduate Gravitational Redshift in Newtonian Equivalence Principle?
- FallenApple
- · Replies 3 ·
Graduate Gravitational Radiation Power of Object in Forced Circular Motion
- James Essig
- · Replies 2 ·
Graduate Why is the spacetime interval invariant under Lorentz transformations?
- laguna
- · Replies 7 ·
Undergrad Vacuum solutions in general relativity
- exponent137
- · Replies 8 ·
Undergrad Will the velocity of light be the same in all reference frames?
- Aswin Sasikumar 1729
- · Replies 34 ·
Undergrad Detecting Earth in an Elevator: Thought Experiment
- Pera Mitic
- · Replies 3 ·
High School Can you warp space faster than light speed?
- kolleamm
- · Replies 6 ·
High School Is the Higgs Field Manipulable?
- jonatron5
- · Replies 2 ·
High School Create Black Hole Through Heat or Fusion?
- General Scientist
- · Replies 7 ·
High School Do Maps of the Universe Change with Speed and Perspective?
- member 342489
- · Replies 7 ·
Undergrad Special Relativity Approximation of Gravitation
- tomdodd4598
- · Replies 27 ·
High School How can time dilation be the same for both observers?
- Prem1998
- · Replies 45 ·
Undergrad Relation between Poincare matrix and electromagnetic field t
- Muratani
- · Replies 5 ·
Graduate Geometry and integral laws of physics
- victorvmotti
- · Replies 10 ·
Undergrad Ricci Tensor in Vacuum Inside Earth - Ideas Appreciated
- AlanE
- · Replies 5 ·
Undergrad Can c be set equal to 1 in certain systems of units?
- pixel
- · Replies 106 ·
Undergrad Measuring Coordinates in Strong Gravity: Schwarzschild Metric
- victorvmotti
- · Replies 3 ·
High School Gravitational waves 50X total stars and not be felt?
- Albertgauss
- · Replies 8 ·
Graduate Length contraction and time dilation from Lorentz S
- Michael C Fowler
- · Replies 5 ·
Graduate Time dilation for the clock in the orbit
- victorvmotti
- · Replies 6 ·
Graduate Gravitational law of induction
- Domenico94
- · Replies 19 ·
High School Why the Earth moves around the Sun forever and ever and ever?
- parshyaa
- · Replies 16 ·
High School How Does Einstein's Theory Affect the Age of Light?
- Francis Ward
- · Replies 84 ·
Undergrad Time Dilation Between Astronaut A and Person B
- kevinki
- · Replies 5 ·
Graduate Geodesic defined for a non affine parameter
- victorvmotti
- · Replies 10 ·
Graduate How do we measure that two objects can have different time?
- Akriel
- · Replies 18 ·
High School General Relativity and Newtonian Mechanics
- alchemistf9
- · Replies 10 ·
High School Why are the gravitational waves we have detected so faint?
- chaszz
- · Replies 28 ·
Graduate Einstein and Lenard in Bad Nauheim
- Histspec
- · Replies 8 ·
High School Does time dilation affect spinning and vibrating objects?
- hsdrop
- · Replies 6 ·
Undergrad How Does the Twin Paradox Illustrate Time Dilation in Special Relativity?
- NoahsArk
- · Replies 71 ·
Undergrad LIGO BH Merger & Black Hole Information Paradox
- andrew s 1905
- · Replies 2 ·
Undergrad Light Acceleration: Does Light Really Accelerate?
- petrushkagoogol
- · Replies 5 ·
Undergrad Confusion about derivation for isotropic fluids
- Dazed&Confused
- · Replies 5 ·
Undergrad What Are the Modern Understandings of Time in Space-Time Theories?
- andrew s 1905
- · Replies 13 ·
High School Can Earth experience slower time than a planet with weaker gravity?
- Kai91
- · Replies 12 ·
Undergrad Why does light move with the train like a thrown ball?
- ewr
- · Replies 46 ·
High School Trying to find a book about two types of immortal people
- JamesonR
- · Replies 2 ·
Insights Orbital Precession in the Schwarzschild and Kerr Metrics - Comments
- Bill_K_Insights
- · Replies 6 ·
High School Visualizing Spacetime: 3 Dimensions Not Enough?
- Patrick Murphy
- · Replies 6 ·
Undergrad Why does Galilean transformation change sign for V between frames?
- kevinki
- · Replies 5 ·
Undergrad Do you age faster at Earth's center due to gravitational time dilation?
- diseasedrat
- · Replies 4 ·
Undergrad Is gravity really a force, or just curved spacetime?
- thetexan
- · Replies 3 ·
Undergrad Can an object accelerate at a constant pace forever?
- Zaephou
- · Replies 2 ·
Undergrad How Does Length Contraction Affect Train Wheel Rotation at Near Light Speeds?
- Sentosa
- · Replies 4 ·
High School Could time run faster in a stationary region of the universe?
- hsdrop
- · Replies 5 ·
High School Pronouncing Subscripts in General Relativity
- Zero-shift
- · Replies 2 ·
High School Black Hole At The Center Of The Earth
- RandyD123
- · Replies 12 ·
Undergrad Does Space-Time Exist Without Energy?
- Pjpic
- · Replies 2 ·
High School Deriving relativistic momentum from Lorentz transformations alone
- Battlemage!
- · Replies 9 ·
High School Why do clocks show simultaneous strikes if observers disagree on timing?
- sqljunkey
- · Replies 24 ·
Undergrad Time Dilation Observation: What Does Earth Observe?
- Punit D
- · Replies 5 ·
Undergrad Clarifying SR Notation for Advanced Mechanics Course
- JulienB
- · Replies 6 ·
High School When was wormhole throat collapse from infalling matter discovered?
- mollwollfumble
- · Replies 16 ·
Undergrad What is the hierarchy of time: Δt, Δs, and Δτ?
- Bristlethorn
- · Replies 5 ·
High School Can a moving observer see the end of a game before it happens?
- CactusLand
- · Replies 3 ·
High School Bomb on train with simultaneous light detectors in different frames
- entropy1
- · Replies 4 ·
High School Is the Speed of Light Governed by an Ether?
- JB321
- · Replies 10 ·
Graduate Noether's Theorem: Julien's Calculation Mistake?
- JulienB
- · Replies 6 ·
Graduate Why are Minkowski and Schwarzschild both vacuum solutions if uniqueness holds?
- ShayanJ
- · Replies 6 ·
Graduate Light rays on coordinate axes vs geodesics in curved spacetime
- Salah93
- · Replies 4 ·
High School How do special relativity equations apply to spacelike separated events?
- Point Conception
- · Replies 9 ·
Undergrad Solving the Gravitational Field Equations
- genefalk
- · Replies 3 ·
Undergrad Should Einstein's Field Equations be modified for cosmology?
- jcap
- · Replies 9 ·