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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 Where and when do length and time dilation occur in special relativity?

May 24, 2004 · Replies 3 · May 24, 2004

Replies: 3

Views: 2K

Graduate Is the relativity postulate of simultaneity reasonable?

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

Replies: 9

Views: 3K

Graduate 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

Undergrad Is it possible to time travel according to Einstein's theory?

May 24, 2004 · Replies 2 · May 24, 2004

Replies: 2

Views: 2K

Graduate Is Time Relative or Absolute in Spacetime?

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

Replies: 4

Views: 3K

Graduate Deriving Energy in Special Relativity: The Principle of Extremal Aging

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

Replies: 3

Views: 3K

Graduate Geometrodynamics Theory: Understanding Time and Length Dilation

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

Replies: 2

Views: 3K

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

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

Replies: 2

Views: 3K

Graduate Time dilation and the big bang

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

Replies: 27

Views: 8K

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

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

Replies: 6

Views: 4K

Graduate Is Time Travel Possible Through Mental Projection?

Apr 29, 2004 · Replies 44 · May 20, 2004

2

Replies: 44

Views: 7K

Graduate Question about frames of reference and clocks

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

Replies: 11

Views: 3K

Graduate Astronomy says light slows down.

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

Replies: 4

Views: 3K

Graduate The velocity of light is constant?

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

Replies: 17

Views: 5K

Graduate Twinship, an attempt to understand SR

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

Replies: 16

Views: 4K

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

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

Replies: 3

Views: 3K

Graduate Four vectors and Lorentz invariance

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

Replies: 2

Views: 3K

Graduate How Does Photon Doppler Shift Work in Radar Design?

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

Replies: 3

Views: 4K

Graduate Time and Indeterminacy vs. Continuity

Oct 14, 2003 · Replies 14 · May 13, 2004

Replies: 14

Views: 6K

Undergrad Real Time Travel: Dr. Mallet & His Time Machine

Apr 29, 2004 · Replies 30 · May 12, 2004

2

Replies: 30

Views: 5K

Graduate Gravitational & Inertial Mass: Why the Difference?

May 9, 2004 · Replies 6 · May 11, 2004

Replies: 6

Views: 3K

Graduate Velocity Calculation with c^2 Substitution

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

Replies: 4

Views: 2K

Graduate 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

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

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

Replies: 8

Views: 4K

Graduate Is the Transverse Doppler Effect Dependent on General Relativity?

May 8, 2004 · Replies 3 · May 9, 2004

Replies: 3

Views: 8K

High School Introduction to Black Holes: Newbie Questions Answered

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

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Replies: 40

Views: 8K

Graduate How Could Naked Singularities Exist Beyond the Event Horizon?

May 7, 2004 · Replies 4 · May 8, 2004

Replies: 4

Views: 3K

Graduate Perception of Time: How Energy & Gravity Affect Our View of Time

Apr 30, 2004 · Replies 15 · May 8, 2004

Replies: 15

Views: 3K

Graduate GR and SR and the speed of change

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

Replies: 16

Views: 4K

Graduate Nature of the cosmological constant

May 7, 2004 · Replies 6 · May 8, 2004

Replies: 6

Views: 2K

Graduate Question on simultaneous events.

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

3

Replies: 64

Views: 9K

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

May 5, 2004 · Replies 3 · May 6, 2004

Replies: 3

Views: 3K

Graduate Quantum Mechanics: Unfamiliar Arena of Before & After

May 4, 2004 · Replies 3 · May 5, 2004

Replies: 3

Views: 2K

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

May 2, 2004 · Replies 8 · May 4, 2004

Replies: 8

Views: 2K

Graduate Pen State Lectures Feb 2004: Abhay Ashtekar

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

Replies: 29

Views: 4K

Graduate Alternative theories to General Relativity - great opportunity

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

Replies: 19

Views: 6K

Undergrad Questioning Time Travel: Can We? Should We?

Apr 30, 2004 · Replies 10 · May 1, 2004

Replies: 10

Views: 3K

Undergrad A computer teacher on a physics roll here?

May 1, 2004 · Replies 1 · May 1, 2004

Replies: 1

Views: 2K

Graduate Is the Kerr-Newman Solution the Only Model for Charged Rotating Black Holes?

Apr 30, 2004 · Replies 1 · Apr 30, 2004

Replies: 1

Views: 4K

Graduate Invariant under Lorentz transformation

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

Replies: 6

Views: 3K

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

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

Replies: 2

Views: 2K

Graduate Light Static? 4D Space, Expanding Upwards at c

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

Replies: 10

Views: 4K

Graduate GPB hopefully to end DM nonsense

Apr 20, 2004 · Replies 13 · Apr 27, 2004

Replies: 13

Views: 3K

Graduate Consistence problems and Introduction to relativity

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

Replies: 3

Views: 3K

Undergrad How Does Mass Distort Spacetime?

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

Replies: 4

Views: 3K

Undergrad Is Mass Truly Just Energy in Different Forms?

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

Replies: 14

Views: 4K

Undergrad SR Misunderstanding: Mass from E=mc^2?

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

Replies: 7

Views: 3K

Graduate Understanding Causality & Tacheyon Time Travel

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

Replies: 5

Views: 3K

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

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

Replies: 2

Views: 2K

Graduate Is Metric Required for Expansion and Causality in Science?

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

Replies: 5

Views: 3K

Graduate The Pugilistic Albert - Round 2

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

2

Replies: 34

Views: 5K

Graduate String and Relativity questions

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

Replies: 18

Views: 3K

Graduate Can Reverse Gravitational Force be Used for Interstellar Travel?

Apr 21, 2004 · Replies 9 · Apr 25, 2004

Replies: 9

Views: 6K

Undergrad Relative Direction: Proving Einstein's Theory with Clocks

Apr 24, 2004 · Replies 6 · Apr 25, 2004

Replies: 6

Views: 3K

Undergrad Why Do People Believe in Einstein Theory Over Push/Radiation Theory?”

Apr 24, 2004 · Replies 12 · Apr 25, 2004

Replies: 12

Views: 3K

Graduate Michelson and Morley solved, relativity gone

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

5

Replies: 129

Views: 15K

Graduate Gravity Probe B: A foregone conclusion?

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

Replies: 2

Views: 2K

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

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

2

Replies: 37

Views: 5K

Graduate Speed of light in a comoving frame

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

Replies: 16

Views: 5K

Graduate The Science of Time Travel: Uncovering Ancient Knowledge and Modern Discoveries

Feb 9, 2004 · Replies 32 · Apr 23, 2004

2

Replies: 32

Views: 12K

Graduate Relativity and accelerating observers?

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

Replies: 10

Views: 7K

Graduate Charges in gravitational fields

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

Replies: 6

Views: 3K

Graduate 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

Graduate 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

Graduate 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: 3K

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

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

4

Replies: 105

Views: 14K

Graduate Doppler & Absorption: Effects on Light Wavelengths

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

Replies: 18

Views: 4K

Graduate Time Dilation different depending on cause?

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

Replies: 2

Views: 2K

Graduate Quantum gravity and planck scales.

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

Replies: 7

Views: 2K

Graduate Relativistic equations, how does one isolate variables?

Apr 17, 2004 · Replies 2 · Apr 17, 2004

Replies: 2

Views: 4K

Graduate The Expansion Tendency of the Universe According to GR

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

Replies: 29

Views: 4K

Graduate This relativistic kinetic energy equation makes no sense to me

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

Replies: 5

Views: 11K

Graduate Traveling Back in Time: Breaking Einstein's 4 Dimensions

Mar 28, 2004 · Replies 21 · Apr 14, 2004

Replies: 21

Views: 5K

Graduate What is the Double Special Relativity theory?

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

Replies: 2

Views: 2K

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

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

Replies: 2

Views: 2K

Graduate Testing General Relativity, and perhaps Quantum Gravity

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

Replies: 9

Views: 3K

Graduate Has light wavelength compression been proven?

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

Replies: 5

Views: 3K

Graduate Graviton Questions: How Do Gravitons Pass Through Objects?

Apr 10, 2004 · Replies 3 · Apr 13, 2004

Replies: 3

Views: 2K

Undergrad The Pugilistic Albert - Round 1

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

Replies: 4

Views: 2K

Graduate What happens to mass at the speed of light

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

Replies: 16

Views: 21K

Graduate Applying the lorentz transformation

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

Replies: 7

Views: 4K

Graduate Does mass truly increase with energy according to special relativity?

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

Replies: 6

Views: 4K

Graduate 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

Graduate The Peripatetic Albert - Warmup Lap

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

Replies: 2

Views: 2K

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

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

Replies: 2

Views: 2K

Undergrad How can mass equation rely on 'rest mass'?

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

Replies: 6

Views: 3K

Undergrad Relativistic Mass Propulsion or the RMP

Mar 26, 2004 · Replies 8 · Apr 11, 2004

Replies: 8

Views: 3K

Graduate Can Twins Age Differently in Space Without Acceleration?

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

Replies: 10

Views: 3K

Graduate Is Space Truly Three Dimensional?

Apr 6, 2004 · Replies 9 · Apr 9, 2004

Replies: 9

Views: 7K

High School Why does the Earth move around the sun?

Apr 8, 2004 · Replies 8 · Apr 9, 2004

Replies: 8

Views: 3K

High School What is FOR ? doppler shift?

Apr 1, 2004 · Replies 2 · Apr 8, 2004

Replies: 2

Views: 2K

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

Apr 5, 2004 · Replies 5 · Apr 7, 2004

Replies: 5

Views: 3K

Graduate How Does Gravity Affect Space and Time Near Black Holes?

Apr 1, 2004 · Replies 8 · Apr 7, 2004

Replies: 8

Views: 3K

Graduate The Fundamental Postulate Of Special Relativity Is Self-Contradictory

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

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Replies: 156

Views: 19K

Undergrad Satellite to test Einstein's predictions

Apr 3, 2004 · Replies 2 · Apr 5, 2004

Replies: 2

Views: 2K

Graduate Mass Change in Objects: Investigating the Effects

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

Replies: 10

Views: 4K

Graduate Quick question on where to apply time dilation.

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

Replies: 10

Views: 3K

Satellite to test Einstein predictions

Apr 3, 2004 · Replies 4 · Apr 4, 2004

Replies: 4

Views: 2K

Graduate General Relativity and relationism

Apr 2, 2004 · Replies 3 · Apr 2, 2004

Replies: 3

Views: 3K

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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