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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 What is the Proper Length of a Ruler in Motion?

Sep 1, 2004 · Replies 13 · Dec 27, 2004

Replies: 13

Views: 7K

Graduate Riemann curvature tensor derivation

Dec 23, 2004 · Replies 4 · Dec 27, 2004

Replies: 4

Views: 12K

Graduate What is the problem with GR and quantum

Dec 22, 2004 · Replies 7 · Dec 26, 2004

Replies: 7

Views: 3K

Graduate If you travel faster than the speed of light, do you open up a black hole?

Dec 24, 2004 · Replies 9 · Dec 26, 2004

Replies: 9

Views: 4K

Graduate Why arent Plancks constant's relative?

Dec 14, 2004 · Replies 15 · Dec 26, 2004

Replies: 15

Views: 5K

Graduate Rotating Coordinate Systems: Are Geocentric and Heliocentric Views Equivalent?

Dec 25, 2004 · Replies 3 · Dec 25, 2004

Replies: 3

Views: 4K

Graduate Just how far away is that star?

Dec 21, 2004 · Replies 15 · Dec 25, 2004

Replies: 15

Views: 5K

Undergrad What is the Gravity Equation for Understanding Mass and Black Holes?

Dec 24, 2004 · Replies 3 · Dec 25, 2004

Replies: 3

Views: 3K

Graduate Where to Find Theodor Kaluza's Paper Sent to Albert Einstein?

Dec 17, 2004 · Replies 2 · Dec 24, 2004

Replies: 2

Views: 5K

Graduate Is it Possible to Resolve the SR Time Dilation Problem? Help Needed!

Dec 23, 2004 · Replies 4 · Dec 24, 2004

Replies: 4

Views: 3K

Graduate Does Mass Change with Energy Exchange in Orbiting Bodies?

Dec 21, 2004 · Replies 22 · Dec 23, 2004

Replies: 22

Views: 4K

Graduate Teaching vs Doing: The Role of Concepts in Research - Insights from Physics

Dec 17, 2004 · Replies 41 · Dec 23, 2004

2

Replies: 41

Views: 5K

Graduate Infinite Time and Hawking Radiation

Dec 17, 2004 · Replies 12 · Dec 22, 2004

Replies: 12

Views: 3K

Graduate Exploring Gravity's Peculiar Features: T Padmanabhan's Latest Paper

Dec 15, 2004 · Replies 2 · Dec 22, 2004

Replies: 2

Views: 4K

Graduate Mass Gain in Supernovae & Black Holes: Explaining Unaccounted Mass

Dec 11, 2004 · Replies 6 · Dec 20, 2004

Replies: 6

Views: 2K

Graduate Q theory, Relativistic Mass and Einstein

Dec 18, 2004 · Replies 15 · Dec 20, 2004

Replies: 15

Views: 4K

Gravitation from the Ground Up - B.F. Schutz

Dec 15, 2004 · Replies 6 · Dec 19, 2004

Replies: 6

Views: 3K

Graduate Is universal time the 4th or 5th Dimension?

Dec 17, 2004 · Replies 3 · Dec 18, 2004

Replies: 3

Views: 9K

Graduate Is Gravity an Attractive Force?

Dec 18, 2004 · Replies 10 · Dec 18, 2004

Replies: 10

Views: 5K

Graduate Seeking a Resolution to the Bug-Rivet Paradox

Dec 17, 2004 · Replies 4 · Dec 18, 2004

Replies: 4

Views: 15K

Graduate Scientific alternative to the anthropic principle

Dec 16, 2004 · Replies 7 · Dec 16, 2004

Replies: 7

Views: 3K

Graduate Beyond c if time goes positive does V decrease?

Dec 14, 2004 · Replies 8 · Dec 16, 2004

Replies: 8

Views: 3K

Graduate Why do photons naturally travel at c?

Nov 26, 2004 · Replies 36 · Dec 16, 2004

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Replies: 36

Views: 6K

Graduate Mass of Photon: Consequences & Experiments - L.C. Tu et al (2004)

Nov 23, 2004 · Replies 78 · Dec 16, 2004

3

Replies: 78

Views: 10K

Graduate Is the universe's potential energy related to the mass inside a shell of matter?

Dec 14, 2004 · Replies 6 · Dec 15, 2004

Replies: 6

Views: 2K

Graduate Laws of physics in four-vector form. A question.

Dec 14, 2004 · Replies 2 · Dec 14, 2004

Replies: 2

Views: 3K

Graduate How objects look at high speeds

Dec 13, 2004 · Replies 2 · Dec 13, 2004

Replies: 2

Views: 2K

Graduate Many Worlds Interpretation of SR

Dec 13, 2004 · Replies 4 · Dec 13, 2004

Replies: 4

Views: 4K

Graduate Einstein´s work ion Unified Field Theory

Dec 12, 2004 · Replies 4 · Dec 13, 2004

Replies: 4

Views: 3K

Graduate Paradoxes that have come up for special relativity

Nov 8, 2004 · Replies 39 · Dec 13, 2004

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Replies: 39

Views: 8K

Graduate Technical paper on Lense-Thirring Lageos measurement

Dec 12, 2004 · Replies 4 · Dec 13, 2004

Replies: 4

Views: 3K

Graduate GR Metric Meaning: Unpacking Confusion

Nov 29, 2004 · Replies 41 · Dec 11, 2004

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Replies: 41

Views: 9K

Graduate Does a single photon have 'color'

Dec 7, 2004 · Replies 13 · Dec 10, 2004

Replies: 13

Views: 17K

Graduate Deriving the Special Relativity Formula: A Scientific Approach

Dec 10, 2004 · Replies 6 · Dec 10, 2004

Replies: 6

Views: 2K

Graduate Shining a Torch at the Moon: Does Light Travel Faster than c?

Dec 10, 2004 · Replies 6 · Dec 10, 2004

Replies: 6

Views: 3K

Graduate Testing SR with a Rotating Mass: Experiments & Theory

Dec 9, 2004 · Replies 4 · Dec 10, 2004

Replies: 4

Views: 2K

Graduate Is Time Dilation Just a Virtual Effect in Relativity?

Dec 10, 2004 · Replies 2 · Dec 10, 2004

Replies: 2

Views: 2K

Undergrad What is the direction of space curvature around a mass in 3D space?

Dec 8, 2004 · Replies 9 · Dec 9, 2004

Replies: 9

Views: 4K

Undergrad 1st postulate of Special Relativity

Dec 8, 2004 · Replies 4 · Dec 9, 2004

Replies: 4

Views: 3K

Undergrad RTT’s mind boggling Time Dilation Paradox

Nov 28, 2004 · Replies 16 · Dec 9, 2004

Replies: 16

Views: 4K

High School Special Relativity for the School Going Child

Nov 30, 2004 · Replies 15 · Dec 9, 2004

Replies: 15

Views: 3K

Undergrad Can the equation e=mc2 be derived?

Dec 7, 2004 · Replies 3 · Dec 7, 2004

Replies: 3

Views: 2K

Graduate Learn Relativity: Exercises & Solutions

Dec 5, 2004 · Replies 5 · Dec 6, 2004

Replies: 5

Views: 3K

High School What Are Defined Quantities in Physics Like Momentum, Velocity, and Force?

Dec 6, 2004 · Replies 10 · Dec 6, 2004

Replies: 10

Views: 10K

Graduate Relativity Q: Light Beam Speed Relative to Object & Observer

Dec 5, 2004 · Replies 5 · Dec 6, 2004

Replies: 5

Views: 2K

Undergrad What Are Parallel Universes and Their Connection to Time Travel?

Nov 8, 2004 · Replies 24 · Dec 6, 2004

Replies: 24

Views: 6K

Graduate What are the implications of GR that are not captured by gravitomagnetism?

Dec 1, 2004 · Replies 10 · Dec 5, 2004

Replies: 10

Views: 4K

Graduate Space curvature allows time travel to the past

Nov 26, 2004 · Replies 4 · Dec 5, 2004

Replies: 4

Views: 4K

Graduate Centrifugal force from GR perspective

Nov 15, 2004 · Replies 32 · Dec 5, 2004

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Replies: 32

Views: 6K

Undergrad Why do we consider time as the 4th dimension?

Dec 3, 2004 · Replies 7 · Dec 4, 2004

Replies: 7

Views: 7K

Graduate Arrow of time and why it flows in only one direction

Nov 19, 2004 · Replies 2 · Dec 3, 2004

Replies: 2

Views: 3K

Graduate Why Can't Information Travel Faster Than Light Without Breaking Causality?

Dec 1, 2004 · Replies 3 · Dec 1, 2004

Replies: 3

Views: 2K

Graduate Understanding Potential and Potential Energy in Relativistic Electrodynamics

Nov 23, 2004 · Replies 5 · Dec 1, 2004

Replies: 5

Views: 2K

Graduate How Does Our Understanding of Black Holes Challenge the Age of the Universe?

Dec 1, 2004 · Replies 3 · Dec 1, 2004

Replies: 3

Views: 2K

High School Do Black Holes Have Dimension?

Nov 23, 2004 · Replies 2 · Nov 30, 2004

Replies: 2

Views: 2K

Graduate Special and General relativity

Nov 29, 2004 · Replies 5 · Nov 29, 2004

Replies: 5

Views: 4K

High School Is the Speed of Light Affected by Atmospheric Conditions?

Nov 27, 2004 · Replies 3 · Nov 28, 2004

Replies: 3

Views: 2K

What are your favorite web pages on SR?

Nov 27, 2004 · Replies 2 · Nov 27, 2004

Replies: 2

Views: 2K

Graduate Black holes and Hawking radiation

Nov 15, 2004 · Replies 14 · Nov 26, 2004

Replies: 14

Views: 4K

Graduate The whole racing with light thingy.

Nov 25, 2004 · Replies 2 · Nov 26, 2004

Replies: 2

Views: 2K

Graduate Can Exceeding the Speed of Light Reverse Time?

Nov 23, 2004 · Replies 2 · Nov 26, 2004

Replies: 2

Views: 3K

Graduate Where Can I Find the Ricci Tensor/Scalar for a Circularly Symmetric Spacetime?

Nov 24, 2004 · Replies 2 · Nov 24, 2004

Replies: 2

Views: 2K

Graduate Communication with a Million-Mile Pole: A Relativity Puzzle?

Nov 24, 2004 · Replies 2 · Nov 24, 2004

Replies: 2

Views: 2K

Undergrad Relativity Notes: Understanding Scalars & Vectors

Nov 17, 2004 · Replies 2 · Nov 24, 2004

Replies: 2

Views: 2K

Undergrad Special relativity and Universe expansion.

Nov 23, 2004 · Replies 3 · Nov 24, 2004

Replies: 3

Views: 5K

Graduate Clock Synchronization: How to Measure Photon Velocity

Nov 19, 2004 · Replies 7 · Nov 23, 2004

Replies: 7

Views: 4K

Graduate Terrestrial phenomena significantly influenced by GR?

Nov 19, 2004 · Replies 5 · Nov 22, 2004

Replies: 5

Views: 2K

Graduate Reconciling Assumptions: Understanding the Concept of the Age of the Universe

Nov 22, 2004 · Replies 2 · Nov 22, 2004

Replies: 2

Views: 3K

Graduate Names of 4-Vector Norms & Physical Quantities

Nov 22, 2004 · Replies 2 · Nov 22, 2004

Replies: 2

Views: 4K

Undergrad What's wrong with my calculation?

Nov 22, 2004 · Replies 3 · Nov 22, 2004

Replies: 3

Views: 3K

Graduate Far Gravitational field of a moving mass

Nov 9, 2004 · Replies 13 · Nov 22, 2004

Replies: 13

Views: 3K

Graduate Is the Speed of Light Really Constant?

Nov 21, 2004 · Replies 3 · Nov 21, 2004

Replies: 3

Views: 3K

Graduate Understanding Interferometers: Principle, Methodology, and Applications

Nov 18, 2004 · Replies 4 · Nov 19, 2004

Replies: 4

Views: 4K

Graduate Embarassingly simple question - Christoffel symbols

Nov 18, 2004 · Replies 6 · Nov 19, 2004

Replies: 6

Views: 3K

Graduate Relativity and Clocks on Airplanes Calibrated from the Ground

Nov 5, 2004 · Replies 8 · Nov 18, 2004

Replies: 8

Views: 3K

Graduate Einstein energy and thermodynamic energy

Oct 18, 2004 · Replies 16 · Nov 16, 2004

Replies: 16

Views: 4K

Graduate The Minkowski so-called 'metric'

Nov 12, 2004 · Replies 5 · Nov 16, 2004

Replies: 5

Views: 3K

Graduate Outer product of two one forms.

Nov 13, 2004 · Replies 3 · Nov 16, 2004

Replies: 3

Views: 5K

Graduate What causes a single photon to propagate in an infinite spacetime?

Nov 13, 2004 · Replies 2 · Nov 15, 2004

Replies: 2

Views: 2K

Graduate Mahematics for general relativiy?

Nov 8, 2004 · Replies 2 · Nov 15, 2004

Replies: 2

Views: 2K

Graduate Can Inertia and Acceleration in Space Be Explained by General Relativity?

Nov 13, 2004 · Replies 2 · Nov 15, 2004

Replies: 2

Views: 2K

Graduate Can Gravity Be Cancelled? Theories and Research on the Effects of Gravity

Jun 30, 2003 · Replies 11 · Nov 10, 2004

Replies: 11

Views: 8K

Graduate Proving the Existence of Event Horizon in Homogeneous Spacetimes

Nov 9, 2004 · Replies 2 · Nov 10, 2004

Replies: 2

Views: 3K

Graduate Yet another spaceship moving at .9c thread

Oct 24, 2004 · Replies 11 · Nov 10, 2004

Replies: 11

Views: 5K

Undergrad Design features in a spacecraft

Nov 8, 2004 · Replies 7 · Nov 10, 2004

Replies: 7

Views: 2K

Graduate .Solving the Time Travel Paradox: An Explanation

Nov 3, 2004 · Replies 9 · Nov 9, 2004

Replies: 9

Views: 2K

Graduate Static Spacetimes: Killing Vectors Explained

Nov 8, 2004 · Replies 12 · Nov 9, 2004

Replies: 12

Views: 4K

Graduate What Is an Electric Field 4-Vector?

Oct 28, 2004 · Replies 3 · Nov 8, 2004

Replies: 3

Views: 5K

Graduate Did Einstein Think Reality Requires an Observer?

Oct 27, 2004 · Replies 3 · Nov 8, 2004

Replies: 3

Views: 3K

Graduate Relativity Qs: Can Anyone Help?

Nov 5, 2004 · Replies 20 · Nov 8, 2004

Replies: 20

Views: 4K

Graduate Does length contraction apply to all objects, big and small?

Nov 5, 2004 · Replies 3 · Nov 6, 2004

Replies: 3

Views: 4K

Graduate 'Speed of Light' Thought Experiment

Oct 26, 2004 · Replies 32 · Nov 5, 2004

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Replies: 32

Views: 8K

Graduate Contraction effects at relativistic velocities

Sep 22, 2004 · Replies 63 · Nov 4, 2004

3

Replies: 63

Views: 10K

Graduate Spacetime Curvature: What Does it Mean?

Nov 3, 2004 · Replies 2 · Nov 4, 2004

Replies: 2

Views: 2K

Undergrad Quest for Gravity Theory: Earth's Rotation Impact?

Nov 2, 2004 · Replies 5 · Nov 3, 2004

Replies: 5

Views: 2K

Graduate The Mysterious 8.88 ft-lbs: A Man in Space Story

Oct 28, 2004 · Replies 36 · Nov 3, 2004

2

Replies: 36

Views: 8K

Graduate What is Einstein Temperature and how can i use it in this question?

Oct 26, 2004 · Replies 2 · Nov 2, 2004

Replies: 2

Views: 9K

Graduate Space-time and the speed of light

Oct 31, 2004 · Replies 11 · Nov 2, 2004

Replies: 11

Views: 5K

Undergrad Understanding Lorentz Transformations: A Derivation for A-Level Students

Oct 31, 2004 · Replies 3 · Nov 1, 2004

Replies: 3

Views: 3K

Undergrad Experiments performed that upholds the predictions of SR?

Oct 29, 2004 · Replies 2 · Oct 31, 2004

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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