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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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Question: Can Gravity Accelerate Beyond the Speed of Light?

Jun 7, 2004 · Replies 2 · Jun 7, 2004

Replies: 2

Views: 2K

Solve the Mystery: Where is My Error in E=mc^2 Calculation?

Jun 6, 2004 · Replies 4 · Jun 7, 2004

Replies: 4

Views: 4K

Relativity & Reality: Electric Charges as the Only Real Entities?

May 26, 2004 · Replies 2 · Jun 7, 2004

Replies: 2

Views: 2K

Acceleration by the Casimir effect: violation of relativity?

May 26, 2004 · Replies 27 · Jun 6, 2004

Replies: 27

Views: 4K

What Did Einstein Imagine When Riding on a Beam of Light?

May 17, 2004 · Replies 9 · Jun 5, 2004

Replies: 9

Views: 9K

Lorentz transform and muon half-life, Help, please

Jun 1, 2004 · Replies 5 · Jun 3, 2004

Replies: 5

Views: 5K

Lorentz Transform Troubles: Seeking Help with Equations and Substitutions

May 26, 2004 · Replies 22 · May 31, 2004

Replies: 22

Views: 4K

Mass and Curved Space Question

May 21, 2004 · Replies 2 · May 28, 2004

Replies: 2

Views: 3K

Can a Strong Cable Connect Planets Faster Than the Speed of Light?

May 27, 2004 · Replies 7 · May 28, 2004

Replies: 7

Views: 6K

A MACHO is passing the solar system at the velocity of .5c.

May 26, 2004 · Replies 8 · May 27, 2004

Replies: 8

Views: 2K

Positively and Negatively Curved Space-time

May 25, 2004 · Replies 8 · May 27, 2004

Replies: 8

Views: 6K

The concept of mass in relativity

May 26, 2004 · Replies 6 · May 26, 2004

Replies: 6

Views: 3K

Light Deflection: Newton vs Relativity

May 24, 2004 · Replies 5 · May 26, 2004

Replies: 5

Views: 5K

Q'izing GR retains local Lorentz invariance after all?

Oct 10, 2003 · Replies 4 · May 26, 2004

Replies: 4

Views: 3K

Time Dilation Paradox: Q&A Explained

May 21, 2004 · Replies 3 · May 25, 2004

Replies: 3

Views: 5K

Is the relativity postulate of simultaneity reasonable?

May 11, 2004 · Replies 9 · May 24, 2004

Replies: 9

Views: 3K

Dr. Aphos and the Theory of Relativity: A Parable of Perception and Physics

May 13, 2004 · Replies 23 · May 24, 2004

Replies: 23

Views: 4K

Is Time Relative or Absolute in Spacetime?

May 5, 2004 · Replies 4 · May 24, 2004

Replies: 4

Views: 3K

Deriving Energy in Special Relativity: The Principle of Extremal Aging

May 22, 2004 · Replies 3 · May 23, 2004

Replies: 3

Views: 3K

Geometrodynamics Theory: Understanding Time and Length Dilation

May 22, 2004 · Replies 2 · May 22, 2004

Replies: 2

Views: 3K

Is the Doppler effect responsible for redshifted photons and time dilation?

May 19, 2004 · Replies 2 · May 21, 2004

Replies: 2

Views: 3K

Time dilation and the big bang

Jan 12, 2004 · Replies 27 · May 20, 2004

Replies: 27

Views: 7K

What Is Background Independent Physics and How Does It Change Geometry?

May 19, 2004 · Replies 6 · May 20, 2004

Replies: 6

Views: 4K

Question about frames of reference and clocks

May 5, 2004 · Replies 11 · May 19, 2004

Replies: 11

Views: 3K

Astronomy says light slows down.

Feb 14, 2004 · Replies 4 · May 18, 2004

Replies: 4

Views: 3K

The velocity of light is constant?

May 13, 2004 · Replies 17 · May 17, 2004

Replies: 17

Views: 5K

Twinship, an attempt to understand SR

Apr 11, 2004 · Replies 16 · May 17, 2004

Replies: 16

Views: 4K

Is there only one possible future? Is free will an illusion?

May 17, 2004 · Replies 3 · May 17, 2004

Replies: 3

Views: 3K

Four vectors and Lorentz invariance

May 9, 2004 · Replies 2 · May 16, 2004

Replies: 2

Views: 3K

How Does Photon Doppler Shift Work in Radar Design?

Mar 31, 2004 · Replies 3 · May 15, 2004

Replies: 3

Views: 4K

Velocity Calculation with c^2 Substitution

May 5, 2004 · Replies 4 · May 11, 2004

Replies: 4

Views: 2K

The Path of Light from Distant Galaxies: With or Without Dark Matter and Energy?

May 10, 2004 · Replies 3 · May 10, 2004

Replies: 3

Views: 2K

What is Mach's Principle and its significance in modern physics?

May 5, 2004 · Replies 8 · May 10, 2004

Replies: 8

Views: 4K

Is the Transverse Doppler Effect Dependent on General Relativity?

May 8, 2004 · Replies 3 · May 9, 2004

Replies: 3

Views: 8K

Introduction to Black Holes: Newbie Questions Answered

Apr 3, 2004 · Replies 40 · May 8, 2004

2

Replies: 40

Views: 8K

GR and SR and the speed of change

Apr 29, 2004 · Replies 16 · May 8, 2004

Replies: 16

Views: 3K

Nature of the cosmological constant

May 7, 2004 · Replies 6 · May 8, 2004

Replies: 6

Views: 2K

Question on simultaneous events.

Feb 5, 2004 · Replies 64 · May 7, 2004

3

Replies: 64

Views: 9K

What is a hypersphere and how can we comprehend its time dimensions?

May 5, 2004 · Replies 3 · May 6, 2004

Replies: 3

Views: 3K

Quantum Mechanics: Unfamiliar Arena of Before & After

May 4, 2004 · Replies 3 · May 5, 2004

Replies: 3

Views: 2K

Relativity and the Puzzling Effects of Velocity on Mass: Encarta Insights

May 2, 2004 · Replies 8 · May 4, 2004

Replies: 8

Views: 2K

Pen State Lectures Feb 2004: Abhay Ashtekar

Apr 29, 2004 · Replies 29 · May 3, 2004

Replies: 29

Views: 4K

Alternative theories to General Relativity - great opportunity

Apr 14, 2004 · Replies 19 · May 2, 2004

Replies: 19

Views: 5K

Invariant under Lorentz transformation

Apr 28, 2004 · Replies 6 · Apr 30, 2004

Replies: 6

Views: 3K

Can You Explain the Basic Equations of General Relativity in 20 Minutes?

Apr 30, 2004 · Replies 2 · Apr 30, 2004

Replies: 2

Views: 2K

Light Static? 4D Space, Expanding Upwards at c

Apr 4, 2004 · Replies 10 · Apr 28, 2004

Replies: 10

Views: 4K

Consistence problems and Introduction to relativity

Apr 25, 2004 · Replies 3 · Apr 27, 2004

Replies: 3

Views: 3K

How Does Mass Distort Spacetime?

Apr 22, 2004 · Replies 4 · Apr 27, 2004

Replies: 4

Views: 3K

Is Mass Truly Just Energy in Different Forms?

Apr 17, 2004 · Replies 14 · Apr 27, 2004

Replies: 14

Views: 4K

SR Misunderstanding: Mass from E=mc^2?

Apr 26, 2004 · Replies 7 · Apr 27, 2004

Replies: 7

Views: 3K

Understanding Einstein's Relativity: From Energy Equations to Series Development

Apr 26, 2004 · Replies 2 · Apr 26, 2004

Replies: 2

Views: 2K

Is Metric Required for Expansion and Causality in Science?

Apr 24, 2004 · Replies 5 · Apr 26, 2004

Replies: 5

Views: 2K

The Pugilistic Albert - Round 2

Apr 13, 2004 · Replies 34 · Apr 26, 2004

2

Replies: 34

Views: 5K

String and Relativity questions

Apr 23, 2004 · Replies 18 · Apr 26, 2004

Replies: 18

Views: 3K

Michelson and Morley solved, relativity gone

Mar 18, 2004 · Replies 129 · Apr 25, 2004

5

Replies: 129

Views: 14K

Understanding Relativity: The Sophomore's Question and Einstein's Answer

Apr 19, 2004 · Replies 37 · Apr 23, 2004

2

Replies: 37

Views: 5K

Speed of light in a comoving frame

Apr 20, 2004 · Replies 16 · Apr 23, 2004

Replies: 16

Views: 5K

Relativity and accelerating observers?

Apr 20, 2004 · Replies 10 · Apr 23, 2004

Replies: 10

Views: 7K

Charges in gravitational fields

Apr 22, 2004 · Replies 6 · Apr 23, 2004

Replies: 6

Views: 3K

What is the medium that affects the speed of light in the Fizeau Experiment?

Apr 21, 2004 · Replies 2 · Apr 23, 2004

Replies: 2

Views: 2K

How can I relate four formulas from special relativity to find a solution?

Apr 22, 2004 · Replies 3 · Apr 22, 2004

Replies: 3

Views: 3K

A newbie question on time dilation formula

Apr 22, 2004 · Replies 6 · Apr 22, 2004

Replies: 6

Views: 3K

Gravity probe launching countdown

Apr 16, 2004 · Replies 2 · Apr 19, 2004

Replies: 2

Views: 2K

Doesn't light's constant speed dictate an 'ether'?

Mar 26, 2004 · Replies 105 · Apr 19, 2004

4

Replies: 105

Views: 14K

Doppler & Absorption: Effects on Light Wavelengths

Mar 31, 2004 · Replies 18 · Apr 19, 2004

Replies: 18

Views: 4K

Time Dilation different depending on cause?

Apr 11, 2004 · Replies 2 · Apr 18, 2004

Replies: 2

Views: 2K

Quantum gravity and planck scales.

Apr 10, 2004 · Replies 7 · Apr 18, 2004

Replies: 7

Views: 2K

The Expansion Tendency of the Universe According to GR

Mar 31, 2004 · Replies 29 · Apr 14, 2004

Replies: 29

Views: 4K

This relativistic kinetic energy equation makes no sense to me

Apr 14, 2004 · Replies 5 · Apr 14, 2004

Replies: 5

Views: 10K

What is the Double Special Relativity theory?

Apr 7, 2004 · Replies 2 · Apr 14, 2004

Replies: 2

Views: 2K

Why the symbol c was chosen to represent the speed of light

Apr 7, 2004 · Replies 2 · Apr 14, 2004

Replies: 2

Views: 2K

Testing General Relativity, and perhaps Quantum Gravity

Mar 28, 2004 · Replies 9 · Apr 14, 2004

Replies: 9

Views: 3K

Has light wavelength compression been proven?

Apr 11, 2004 · Replies 5 · Apr 13, 2004

Replies: 5

Views: 3K

The Pugilistic Albert - Round 1

Apr 12, 2004 · Replies 4 · Apr 13, 2004

Replies: 4

Views: 2K

What happens to mass at the speed of light

Apr 1, 2004 · Replies 16 · Apr 13, 2004

Replies: 16

Views: 21K

Applying the lorentz transformation

Apr 9, 2004 · Replies 7 · Apr 13, 2004

Replies: 7

Views: 4K

Does mass truly increase with energy according to special relativity?

Mar 31, 2004 · Replies 6 · Apr 13, 2004

Replies: 6

Views: 4K

Can Mach's Principle Be Tested with a Gyroscope in the Void of Space?

Apr 9, 2004 · Replies 8 · Apr 12, 2004

Replies: 8

Views: 3K

The Peripatetic Albert - Warmup Lap

Apr 11, 2004 · Replies 2 · Apr 12, 2004

Replies: 2

Views: 2K

What Are the Best Resources for Understanding Einstein's Relativity?

Apr 10, 2004 · Replies 2 · Apr 12, 2004

Replies: 2

Views: 2K

How can mass equation rely on 'rest mass'?

Apr 11, 2004 · Replies 6 · Apr 12, 2004

Replies: 6

Views: 3K

Can Twins Age Differently in Space Without Acceleration?

Apr 10, 2004 · Replies 10 · Apr 10, 2004

Replies: 10

Views: 3K

Is Space Truly Three Dimensional?

Apr 6, 2004 · Replies 9 · Apr 9, 2004

Replies: 9

Views: 7K

What is FOR ? doppler shift?

Apr 1, 2004 · Replies 2 · Apr 8, 2004

Replies: 2

Views: 2K

Traveling at Light Speed: Our Earth's Movement Through Time

Apr 5, 2004 · Replies 5 · Apr 7, 2004

Replies: 5

Views: 3K

How Does Gravity Affect Space and Time Near Black Holes?

Apr 1, 2004 · Replies 8 · Apr 7, 2004

Replies: 8

Views: 3K

The Fundamental Postulate Of Special Relativity Is Self-Contradictory

Mar 31, 2004 · Replies 156 · Apr 7, 2004

6

Replies: 156

Views: 19K

Satellite to test Einstein's predictions

Apr 3, 2004 · Replies 2 · Apr 5, 2004

Replies: 2

Views: 2K

Mass Change in Objects: Investigating the Effects

Mar 27, 2004 · Replies 10 · Apr 5, 2004

Replies: 10

Views: 4K

Quick question on where to apply time dilation.

Apr 3, 2004 · Replies 10 · Apr 4, 2004

Replies: 10

Views: 3K

General Relativity and relationism

Apr 2, 2004 · Replies 3 · Apr 2, 2004

Replies: 3

Views: 3K

Light in the wake of huge objects

Mar 24, 2004 · Replies 2 · Apr 2, 2004

Replies: 2

Views: 2K

Laymen’s view of what general relativity is?

Apr 1, 2004 · Replies 5 · Apr 2, 2004

Replies: 5

Views: 2K

What Unique Perspectives on Mathematics Does the UCR Math Website Offer?

Mar 26, 2004 · Replies 2 · Apr 2, 2004

Replies: 2

Views: 8K

Can Gravity Enable Instantaneous Communication Faster Than Light?

Mar 14, 2004 · Replies 9 · Apr 1, 2004

Replies: 9

Views: 3K

How does the uncertainty principle affect the behavior of photons?

Mar 29, 2004 · Replies 8 · Mar 31, 2004

Replies: 8

Views: 3K

Is The Theory Of Special Relativity Wrong?

Mar 30, 2004 · Replies 18 · Mar 31, 2004

Replies: 18

Views: 5K

Can we really travel back in time using a wormhole?

Mar 25, 2004 · Replies 4 · Mar 30, 2004

Replies: 4

Views: 4K

Stephen Hawking Grand Unified Theory

Mar 18, 2004 · Replies 2 · Mar 29, 2004

Replies: 2

Views: 4K

What is the significance of a 4-vector's magnitude being c?

Mar 27, 2004 · Replies 10 · Mar 29, 2004

Replies: 10

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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