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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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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

2

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

5

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

4

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

2

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: 3K

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

Graduate Is only GR enough for proved the event horizon

Feb 24, 2005 · Replies 4 · Feb 27, 2005

Replies: 4

Views: 3K

Graduate How Do Lorentz Transformations Work with Y and Z Components of Speed?

Feb 1, 2005 · Replies 29 · Feb 25, 2005

Replies: 29

Views: 6K

Graduate Relativistic Mass of an Orbiting Billiard Ball

Feb 19, 2005 · Replies 44 · Feb 25, 2005

2

Replies: 44

Views: 8K

Undergrad Relativistic Mass: Fact or Fiction?

Feb 24, 2005 · Replies 16 · Feb 24, 2005

Replies: 16

Views: 3K

Graduate Derivation of the momentum-energy relation

Feb 23, 2005 · Replies 10 · Feb 24, 2005

Replies: 10

Views: 20K

Graduate Is the General Theory of Relativity Worth Learning from a Troll?

Feb 23, 2005 · Replies 7 · Feb 23, 2005

Replies: 7

Views: 2K

Graduate New to Relativity:Need Answers

Feb 23, 2005 · Replies 4 · Feb 23, 2005

Replies: 4

Views: 2K

Graduate Relativity and temperature question

Feb 17, 2005 · Replies 52 · Feb 21, 2005

2

Replies: 52

Views: 7K

Einstein's Mass-Energy Equivalence

Feb 19, 2005 · Replies 7 · Feb 21, 2005

Replies: 7

Views: 4K

Graduate Unification of GR and classical E&M

Feb 7, 2005 · Replies 26 · Feb 21, 2005

Replies: 26

Views: 4K

Graduate Why Does Light Have No Rest Mass While Other Particles Do?

Feb 15, 2005 · Replies 10 · Feb 20, 2005

Replies: 10

Views: 3K

Graduate Weighing Mass of Photons in Different Directions

Feb 19, 2005 · Replies 16 · Feb 20, 2005

Replies: 16

Views: 6K

Graduate Is matter truly keeping pace with the expansion of space?

Feb 14, 2005 · Replies 26 · Feb 18, 2005

Replies: 26

Views: 6K

Graduate Help with a little Gedanken experiment please?

Feb 15, 2005 · Replies 5 · Feb 16, 2005

Replies: 5

Views: 3K

Undergrad Plank & Bullet Experiment: Questions Explained

Feb 15, 2005 · Replies 2 · Feb 15, 2005

Replies: 2

Views: 2K

Undergrad Galilean Transformation Question

Feb 13, 2005 · Replies 4 · Feb 13, 2005

Replies: 4

Views: 7K

Graduate Time Reversed: Can Humans Think?

Feb 8, 2005 · Replies 6 · Feb 11, 2005

Replies: 6

Views: 7K

Graduate RF SR: What If I'm Anchored to a Moving Train?

Feb 3, 2005 · Replies 2 · Feb 10, 2005

Replies: 2

Views: 2K

Undergrad Derivation of relativistic energy

Feb 10, 2005 · Replies 2 · Feb 10, 2005

Replies: 2

Views: 31K

Graduate Is time dialation really *time* dialation?

Feb 7, 2005 · Replies 5 · Feb 9, 2005

Replies: 5

Views: 3K

Graduate Hamilton-Jacobi equation for Gr

Feb 7, 2005 · Replies 2 · Feb 7, 2005

Replies: 2

Views: 4K

Graduate Relativistic effects in non-vacuous media

Feb 2, 2005 · Replies 3 · Feb 5, 2005

Replies: 3

Views: 3K

Graduate Possible solution for dark energy

Feb 2, 2005 · Replies 14 · Feb 4, 2005

Replies: 14

Views: 3K

Graduate Question About Relativistic Acceleration

Feb 2, 2005 · Replies 84 · Feb 3, 2005

3

Replies: 84

Views: 9K

Undergrad What Experiments Provide Evidence for General Relativity?

Jan 27, 2005 · Replies 8 · Feb 3, 2005

Replies: 8

Views: 4K

Undergrad Unraveling the Gamma Factor Equation

Feb 2, 2005 · Replies 4 · Feb 3, 2005

Replies: 4

Views: 30K

Undergrad Why does E=MC^2 require the speed of light and why is it squared?

Feb 2, 2005 · Replies 5 · Feb 3, 2005

Replies: 5

Views: 2K

Graduate How to retrieve the lenght-contraction from the LT?

Feb 2, 2005 · Replies 6 · Feb 3, 2005

Replies: 6

Views: 3K

Graduate What is the accuracy of world time and can it be improved?

Jan 31, 2005 · Replies 3 · Feb 2, 2005

Replies: 3

Views: 3K

Graduate Einstein's Quadrapole Model for Gravity Waves

Jan 23, 2005 · Replies 23 · Feb 1, 2005

Replies: 23

Views: 8K

Graduate Time Travel: Examining the Possibilities

Dec 22, 2004 · Replies 19 · Feb 1, 2005

Replies: 19

Views: 5K

Graduate Quick question for a confused English major

Jan 21, 2005 · Replies 4 · Jan 31, 2005

Replies: 4

Views: 3K

Graduate Is gravitation faster than light?

Jan 5, 2005 · Replies 90 · Jan 30, 2005

4

Replies: 90

Views: 17K

Graduate Stationary Einstein-Vlasov system

Jan 24, 2005 · Replies 3 · Jan 30, 2005

Replies: 3

Views: 2K

Has anyone heard any more about this guy

Jan 28, 2005 · Replies 5 · Jan 28, 2005

Replies: 5

Views: 3K

Graduate What is the Mass Density of a Magnetic Field in Relativity?

Jan 26, 2005 · Replies 2 · Jan 28, 2005

Replies: 2

Views: 3K

High School The Sun revolves around the Earth?

Jan 27, 2005 · Replies 12 · Jan 28, 2005

Replies: 12

Views: 7K

Graduate How Does Sectional Curvature Define Spacetimes in General Relativity?

Jan 26, 2005 · Replies 2 · Jan 27, 2005

Replies: 2

Views: 3K

Graduate Does Special Relativity Suggest a Predetermined Future?

Jan 17, 2005 · Replies 46 · Jan 27, 2005

2

Replies: 46

Views: 7K

Undergrad Start Learning Relativity: Books for Beginners

Jan 26, 2005 · Replies 2 · Jan 26, 2005

Replies: 2

Views: 3K

Graduate Twins/triplets again, but *truly* symmetric

Dec 28, 2004 · Replies 9 · Jan 26, 2005

Replies: 9

Views: 3K

Graduate Massive objects going 99.9% speed of light.

Jan 19, 2005 · Replies 12 · Jan 26, 2005

Replies: 12

Views: 7K

Graduate How Do Muons Travel from the Atmosphere to Earth Despite Their Short Lifespan?

Jan 17, 2005 · Replies 2 · Jan 24, 2005

Replies: 2

Views: 8K

Undergrad Can objects travel faster than light in relativity?

Jan 13, 2005 · Replies 8 · Jan 24, 2005

Replies: 8

Views: 6K

Graduate Understanding Relativity: The Reality of Time and Space

Jan 21, 2005 · Replies 15 · Jan 24, 2005

Replies: 15

Views: 5K

Graduate Hell all me life or death situation

Jan 23, 2005 · Replies 3 · Jan 24, 2005

Replies: 3

Views: 2K

Graduate What Number Boxcar Will Sam Stop At?

Jan 22, 2005 · Replies 11 · Jan 23, 2005

Replies: 11

Views: 3K

Graduate Particle Energy in Schutz's "A First Course in General Relativity

Jan 16, 2005 · Replies 34 · Jan 23, 2005

2

Replies: 34

Views: 5K

Undergrad What Makes Light Travel at Speed C?

Jan 15, 2005 · Replies 2 · Jan 22, 2005

Replies: 2

Views: 2K

Graduate The first failure of relativity?

Jan 21, 2005 · Replies 8 · Jan 22, 2005

Replies: 8

Views: 3K

Graduate Can Geometry Explain Electricity and Magnetism Like Gravity?

Jan 13, 2005 · Replies 4 · Jan 21, 2005

Replies: 4

Views: 2K

Undergrad Mass and Energy: Photons, Energy, and Light Speed

Jan 21, 2005 · Replies 6 · Jan 21, 2005

Replies: 6

Views: 2K

Graduate H Ziegler - Does any one have any info on him?

Jan 11, 2005 · Replies 2 · Jan 20, 2005

Replies: 2

Views: 3K

Graduate What is the true nature of Spacetime?

Jan 20, 2005 · Replies 4 · Jan 20, 2005

Replies: 4

Views: 2K

Graduate Generalized Lorentz Transformation for an Accelerated Frame of Reference

Jan 16, 2005 · Replies 10 · Jan 19, 2005

Replies: 10

Views: 8K

Graduate Mechanical Time Dilation: Explained

Jan 19, 2005 · Replies 2 · Jan 19, 2005

Replies: 2

Views: 2K

Graduate What is the true meaning of E=mc² in mass-energy conversion?

Jan 18, 2005 · Replies 6 · Jan 19, 2005

Replies: 6

Views: 3K

Graduate Is There a Discrepancy Between Inertial and Gravitational Mass in Relativity?

Jan 16, 2005 · Replies 9 · Jan 18, 2005

Replies: 9

Views: 4K

Undergrad What ever happened with NEC's experiment that exceeded the speed of light?

Jan 18, 2005 · Replies 2 · Jan 18, 2005

Replies: 2

Views: 2K

Undergrad Confused about black holes and acceleration

Jan 18, 2005 · Replies 2 · Jan 18, 2005

Replies: 2

Views: 2K

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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