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Special and General Relativity Forum

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.

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Graduate Cosmological Questions and Their Degenerate Answers

Apr 14, 2005 · Replies 32 · Apr 21, 2005

2

Replies: 32

Views: 5K

Undergrad How can I plot the altitude of a capsule during re-entry?

Apr 21, 2005 · Replies 2 · Apr 21, 2005

Replies: 2

Views: 2K

Undergrad How Long Does a Meter Stick Appear When Traveling at Light Speed?

Apr 20, 2005 · Replies 3 · Apr 20, 2005

Replies: 3

Views: 5K

High School Why the speed of light is so fast?

Apr 13, 2005 · Replies 12 · Apr 20, 2005

Replies: 12

Views: 3K

Graduate Solving Ball's Shadow: Theoretical Analysis

Apr 19, 2005 · Replies 2 · Apr 19, 2005

Replies: 2

Views: 3K

Graduate Geometry vs Particles: Einstein's Perspective on Gravity

Apr 19, 2005 · Replies 3 · Apr 19, 2005

Replies: 3

Views: 2K

Graduate How Are Wormholes Created and Can Water Hold Them Open?

Apr 18, 2005 · Replies 6 · Apr 19, 2005

Replies: 6

Views: 3K

Graduate Good online report about wormholes?

Mar 31, 2005 · Replies 7 · Apr 19, 2005

Replies: 7

Views: 3K

Graduate Inhomogeneous and anisotropic dust models

Apr 14, 2005 · Replies 6 · Apr 19, 2005

Replies: 6

Views: 2K

Graduate Electron in Earth Orbit: Does it Emit Radiation?

Apr 18, 2005 · Replies 4 · Apr 19, 2005

Replies: 4

Views: 3K

Graduate Viewing the Big Bang? Answers for AstroGeek Toby

Apr 19, 2005 · Replies 2 · Apr 19, 2005

Replies: 2

Views: 5K

Graduate What does imaginary time mean in spacetime separation?

Apr 18, 2005 · Replies 13 · Apr 19, 2005

Replies: 13

Views: 6K

Undergrad Why is the Twins Paradox Confusing in Relativity?

Apr 18, 2005 · Replies 6 · Apr 19, 2005

Replies: 6

Views: 4K

Graduate Relativistic Force and Acceleration: Understanding the Relationship

Apr 18, 2005 · Replies 3 · Apr 18, 2005

Replies: 3

Views: 2K

Graduate Why is the Principle of Equivalence considered a theorem?

Apr 14, 2005 · Replies 15 · Apr 18, 2005

Replies: 15

Views: 4K

Graduate How Time Passes Differently for Twins Traveling at Light Speed

Apr 3, 2005 · Replies 105 · Apr 17, 2005

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Replies: 105

Views: 11K

Graduate A wrong statement regarding SR.

Apr 16, 2005 · Replies 3 · Apr 16, 2005

Replies: 3

Views: 2K

Undergrad Short Title: Does Einstein's Special Relativity Disprove the Existence of Ether?

Apr 6, 2005 · Replies 3 · Apr 15, 2005

Replies: 3

Views: 3K

Graduate How does the weight of a rock change in relativistic speeds?

Mar 29, 2005 · Replies 6 · Apr 15, 2005

Replies: 6

Views: 2K

Graduate The Physics of Falling into a Black Hole: Time Dilation and the Event Horizon

Apr 11, 2005 · Replies 22 · Apr 15, 2005

Replies: 22

Views: 6K

Graduate Light Speed Not Constant: Impact on E=mc^2

Apr 15, 2005 · Replies 5 · Apr 15, 2005

Replies: 5

Views: 3K

Graduate A new epistemology of Relativity

Apr 5, 2005 · Replies 4 · Apr 15, 2005

Replies: 4

Views: 2K

Graduate Is Temperature Independent of Observer Velocity in Relativity?

Apr 9, 2005 · Replies 5 · Apr 15, 2005

Replies: 5

Views: 2K

Graduate Limit as the Speed of Light becomes Infinite

Apr 12, 2005 · Replies 11 · Apr 14, 2005

Replies: 11

Views: 4K

Graduate Do black holes affect the path of photons and neutrinos?

Apr 6, 2005 · Replies 15 · Apr 14, 2005

Replies: 15

Views: 4K

Undergrad Charged particle moving relativistically through E field

Apr 13, 2005 · Replies 3 · Apr 14, 2005

Replies: 3

Views: 5K

Graduate Is Time Dilation Affected by Varying Mass Density in Identical Universes?

Apr 6, 2005 · Replies 2 · Apr 13, 2005

Replies: 2

Views: 3K

Undergrad Differentiate between the two masses in equation for relativistic mass

Apr 11, 2005 · Replies 1 · Apr 11, 2005

Replies: 1

Views: 3K

Graduate Absolute motion, is it detectable?

Apr 7, 2005 · Replies 14 · Apr 11, 2005

Replies: 14

Views: 5K

Graduate Can an Event be in one frame and not be in another?

Apr 11, 2005 · Replies 4 · Apr 11, 2005

Replies: 4

Views: 2K

Undergrad Special relativity- time expansion

Apr 7, 2005 · Replies 4 · Apr 11, 2005

Replies: 4

Views: 7K

Graduate What I tell laymen who ask me about SR

Jan 15, 2005 · Replies 35 · Apr 10, 2005

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Replies: 35

Views: 10K

Graduate Energy conservation in General relativity

Apr 9, 2005 · Replies 6 · Apr 10, 2005

Replies: 6

Views: 6K

Undergrad Special relativity and substitution

Apr 7, 2005 · Replies 5 · Apr 10, 2005

Replies: 5

Views: 2K

Graduate Mach's Principle: Inertia, Newton, Einstein & Gedanken Experiments

Mar 27, 2005 · Replies 81 · Apr 9, 2005

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Replies: 81

Views: 13K

Graduate Understanding Time Dilation in Special Relativity

Apr 5, 2005 · Replies 10 · Apr 8, 2005

Replies: 10

Views: 5K

Graduate Speed of light measured the same by all inertial observers?

Apr 7, 2005 · Replies 6 · Apr 7, 2005

Replies: 6

Views: 2K

Graduate Calculating Arrival Time Difference for Particles Produced in a Distant Galaxy

Apr 6, 2005 · Replies 5 · Apr 7, 2005

Replies: 5

Views: 2K

Undergrad Questions About Speed of Light & Time

Apr 4, 2005 · Replies 35 · Apr 7, 2005

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Replies: 35

Views: 5K

Undergrad Why does refraction of light involve a difference in speed?

Apr 7, 2005 · Replies 3 · Apr 7, 2005

Replies: 3

Views: 2K

Undergrad Physics Crisis: Faith in Gravity Clarified

Apr 3, 2005 · Replies 14 · Apr 6, 2005

Replies: 14

Views: 3K

Graduate Who does time really slow down for?

Mar 29, 2005 · Replies 22 · Apr 5, 2005

Replies: 22

Views: 6K

Graduate What are the earliest online publications discussing the Twin Paradox?

Apr 4, 2005 · Replies 2 · Apr 5, 2005

Replies: 2

Views: 2K

High School E =mc{squared} How Did He Arrive At This ?

Apr 3, 2005 · Replies 30 · Apr 4, 2005

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Replies: 30

Views: 3K

Graduate Time travel and cosmic strings

Mar 20, 2005 · Replies 3 · Apr 4, 2005

Replies: 3

Views: 3K

How Can I Use My Spaceship to Reset My Clock?

Mar 31, 2005 · Replies 8 · Apr 3, 2005

Replies: 8

Views: 2K

Graduate Discover the AEther Bunny: Understanding Lorentz Relativity and Twin Aging

Mar 26, 2005 · Replies 2 · Apr 2, 2005

Replies: 2

Views: 3K

Graduate How Does Time Dilation Affect Colony Ships A and B in Relativity Theory?

Mar 24, 2005 · Replies 45 · Apr 2, 2005

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Replies: 45

Views: 6K

Graduate Does anybody have a better analogy of describing space-time curvature?

Mar 26, 2005 · Replies 9 · Apr 2, 2005

Replies: 9

Views: 7K

Graduate How Does Gravity Affect Time Near Earth's Core?

Mar 23, 2005 · Replies 2 · Mar 30, 2005

Replies: 2

Views: 3K

Graduate Time Dilation and Video Transmission in Relativistic Spaceships

Mar 30, 2005 · Replies 3 · Mar 30, 2005

Replies: 3

Views: 4K

Graduate Relativity situation. Questions.

Mar 29, 2005 · Replies 2 · Mar 30, 2005

Replies: 2

Views: 2K

Graduate Gravity & Photons: Dynamics of a Hypothetical Closed Universe

Mar 17, 2005 · Replies 13 · Mar 28, 2005

Replies: 13

Views: 4K

Undergrad I know how to travel faster than light :\

Mar 26, 2005 · Replies 6 · Mar 28, 2005

Replies: 6

Views: 4K

Undergrad Lorentz transformations explanation?

Mar 17, 2005 · Replies 11 · Mar 27, 2005

Replies: 11

Views: 3K

Graduate Could Time Dilation Explain the Huge Redshifts Observed in Distant Stars?

Mar 26, 2005 · Replies 7 · Mar 27, 2005

Replies: 7

Views: 3K

Undergrad Energy to Matter: Unlocking E=mc^2

Mar 17, 2005 · Replies 10 · Mar 27, 2005

Replies: 10

Views: 3K

Graduate Does light bending doubly violate the equivalence principle?

Mar 8, 2005 · Replies 5 · Mar 26, 2005

Replies: 5

Views: 5K

Undergrad An odd sort of symmetry about E=MC^2

Mar 26, 2005 · Replies 4 · Mar 26, 2005

Replies: 4

Views: 2K

Graduate Conservation Principle Related to Expanding Space?

Mar 17, 2005 · Replies 4 · Mar 26, 2005

Replies: 4

Views: 3K

Undergrad Why Can One Train Start Up Faster Than the Other After Braking Nose to Nose?

Mar 23, 2005 · Replies 26 · Mar 25, 2005

Replies: 26

Views: 9K

Graduate The Twin Paradox Revisited: A Local Case Study

Nov 3, 2004 · Replies 44 · Mar 25, 2005

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Replies: 44

Views: 15K

High School Magnetism & Gravity: Unravelling the Mysteries

Mar 23, 2005 · Replies 8 · Mar 24, 2005

Replies: 8

Views: 2K

Undergrad The Twins Paradox: A Controversial Truth or a Perplexing Paradox?

Jan 28, 2005 · Replies 129 · Mar 23, 2005

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Replies: 129

Views: 17K

Undergrad What do you see at light speed?

Feb 25, 2005 · Replies 7 · Mar 23, 2005

Replies: 7

Views: 17K

High School Understanding Speed and Time: The Impact of Reaching the Speed of Light

Mar 19, 2005 · Replies 18 · Mar 23, 2005

Replies: 18

Views: 3K

Graduate What Are the Degrees of Freedom for a Massive Spin 1 Particle?

Mar 21, 2005 · Replies 16 · Mar 22, 2005

Replies: 16

Views: 5K

Graduate Question about GR - movement in space-time

Mar 22, 2005 · Replies 6 · Mar 22, 2005

Replies: 6

Views: 4K

Graduate An exercise in eloquence: Basic GTR

Mar 21, 2005 · Replies 2 · Mar 22, 2005

Replies: 2

Views: 2K

Graduate Is Phase Velocity Greater than c in Spacetime?

Dec 15, 2004 · Replies 24 · Mar 20, 2005

Replies: 24

Views: 5K

Graduate What's the Flaw in the Relativity Paradox of Gravity and Speed?

Mar 18, 2005 · Replies 4 · Mar 19, 2005

Replies: 4

Views: 3K

Undergrad Ether Drag Hypothesis Explained - 65 Characters

Feb 12, 2005 · Replies 105 · Mar 19, 2005

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Replies: 105

Views: 25K

Undergrad Using four-vectors in derivations and proofs

Mar 17, 2005 · Replies 6 · Mar 18, 2005

Replies: 6

Views: 2K

Undergrad Fleeing earth at the speed of light

Mar 18, 2005 · Replies 5 · Mar 18, 2005

Replies: 5

Views: 2K

Undergrad Race Between Light and Runner: Who Wins?

Mar 9, 2005 · Replies 24 · Mar 18, 2005

Replies: 24

Views: 6K

Undergrad Twins paradox need clarification

Mar 10, 2005 · Replies 17 · Mar 18, 2005

Replies: 17

Views: 4K

Graduate Definition of 4-vector quantities

Mar 12, 2005 · Replies 3 · Mar 18, 2005

Replies: 3

Views: 3K

Graduate Reverse engineering relativity?

Mar 15, 2005 · Replies 6 · Mar 17, 2005

Replies: 6

Views: 2K

Graduate What Are the Effects of Mass and Energy on the Universe's Future?

Mar 14, 2005 · Replies 2 · Mar 14, 2005

Replies: 2

Views: 3K

Time machine possible or impossilble

Mar 10, 2005 · Replies 29 · Mar 13, 2005

Replies: 29

Views: 13K

Graduate Tensor gradient and maxwell's equation

Mar 12, 2005 · Replies 2 · Mar 12, 2005

Replies: 2

Views: 10K

Undergrad Understanding Matter, Energy & Relativity - How This Can Be?

Mar 9, 2005 · Replies 5 · Mar 11, 2005

Replies: 5

Views: 2K

Graduate Invariants in general relativity

Mar 11, 2005 · Replies 2 · Mar 11, 2005

Replies: 2

Views: 3K

Graduate Derivation of Lorentz Transformations

Mar 8, 2005 · Replies 12 · Mar 11, 2005

Replies: 12

Views: 4K

Graduate Did the Fitzgerald-Lorentz Contraction Explain the Michelson-Morley Experiment?

Feb 25, 2005 · Replies 7 · Mar 11, 2005

Replies: 7

Views: 3K

Graduate Second Postulate of Special Relativity

Mar 8, 2005 · Replies 7 · Mar 10, 2005

Replies: 7

Views: 4K

Graduate Are Both Twins Equivalent in a Torus Universe with the Twin Paradox?

Feb 27, 2005 · Replies 32 · Mar 9, 2005

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Replies: 32

Views: 7K

Graduate What Does 'Velocity' Mean for a Ray of Light?

Mar 7, 2005 · Replies 5 · Mar 8, 2005

Replies: 5

Views: 3K

Einstein Conference: US & Canada Events

Feb 28, 2005 · Replies 2 · Mar 7, 2005

Replies: 2

Views: 3K

Graduate Question from I. KINEMATICAL PART § 1. Definition of Simultaneity

Feb 9, 2005 · Replies 19 · Mar 6, 2005

Replies: 19

Views: 4K

Graduate Why is time dilation expressed as t' in special relativity?

Mar 4, 2005 · Replies 9 · Mar 5, 2005

Replies: 9

Views: 2K

High School E=MC^2 - Do I have this right?

Mar 3, 2005 · Replies 8 · Mar 5, 2005

Replies: 8

Views: 3K

Undergrad Is there a thread or website to learn the theory of relativity from A-Z?

Mar 3, 2005 · Replies 11 · Mar 3, 2005

Replies: 11

Views: 3K

Graduate Explaining a Paradox in Modern Physics

Feb 27, 2005 · Replies 22 · Mar 3, 2005

Replies: 22

Views: 7K

Graduate Black Holes in the Very Early Universe

Feb 22, 2005 · Replies 9 · Mar 1, 2005

Replies: 9

Views: 3K

Graduate A little problem in general relativity;momentum

Feb 26, 2005 · Replies 13 · Mar 1, 2005

Replies: 13

Views: 3K

Graduate What is the Limits of Lorentz Transformation when (v/c->1)?.

Feb 27, 2005 · Replies 8 · Feb 28, 2005

Replies: 8

Views: 4K

Graduate GR: Black Hole - Electrical Charge

Feb 27, 2005 · Replies 2 · Feb 28, 2005

Replies: 2

Views: 3K

Graduate What explains the increase in mass at high speeds?

Feb 25, 2005 · Replies 10 · Feb 27, 2005

Replies: 10

Views: 4K

Graduate Harmless Lorentz transformation question

Feb 6, 2005 · Replies 101 · Feb 27, 2005

4

Replies: 101

Views: 13K

Relativity

The theory of relativity, formulated by Albert Einstein, comprises two fundamental theories—special and general relativity. Special relativity, proposed in 1905, redefines our understanding of space and time by asserting the constancy of the speed of light for all observers and introducing concepts like time dilation and length contraction.

General relativity, presented in 1915, extends these principles to incorporate gravity. It describes gravity as the curvature of spacetime caused by massive objects, leading to phenomena like gravitational time dilation and the prediction of black holes. Einstein's equations have been consistently validated through experiments and observations, profoundly influencing our comprehension of the universe's fabric and dynamics.

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