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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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What Are the Implications of Time Dilation on a Photon’s Speed and Perception?

Apr 15, 2007 · Replies 4 · Apr 15, 2007

Replies: 4

Views: 3K

What is the first result on Gravity Probe B?

Apr 14, 2007 · Replies 2 · Apr 14, 2007

Replies: 2

Views: 2K

Explain Independent Continuum: Einstein's Theory

Apr 14, 2007 · Replies 8 · Apr 14, 2007

Replies: 8

Views: 3K

What is the mass of a photon and why does it have a mass?

Apr 11, 2007 · Replies 17 · Apr 14, 2007

Replies: 17

Views: 5K

Question on Relativistic Doppler Shift

Apr 9, 2007 · Replies 6 · Apr 14, 2007

Replies: 6

Views: 4K

Why is Planck time measured differently from other dimensions?

Apr 11, 2007 · Replies 19 · Apr 13, 2007

Replies: 19

Views: 6K

Velocity Addition in MG and Light Scenarios

Mar 2, 2007 · Replies 22 · Apr 12, 2007

Replies: 22

Views: 5K

The Nature of Time: Should It Be Considered a 4th Dimension?

Apr 2, 2007 · Replies 95 · Apr 11, 2007

4

Replies: 95

Views: 14K

Is There an Absolute Rest Frame in a 2D Universe?

Nov 22, 2004 · Replies 58 · Apr 10, 2007

2

Replies: 58

Views: 7K

Looking for a relativity movie

Apr 6, 2007 · Replies 8 · Apr 10, 2007

Replies: 8

Views: 3K

Metric of supermassive black holes

Apr 9, 2007 · Replies 2 · Apr 9, 2007

Replies: 2

Views: 2K

How Do CMB and Redshift Support Universe Expansion?

Apr 7, 2007 · Replies 1 · Apr 8, 2007

Replies: 1

Views: 5K

A scientist’s transmitter emits a wavelength

Mar 19, 2007 · Replies 34 · Apr 7, 2007

2

Replies: 34

Views: 6K

A question about a thought experiment in space

Mar 12, 2007 · Replies 55 · Apr 7, 2007

2

Replies: 55

Views: 9K

Understanding the Impact of Mood on Perception

Apr 6, 2007 · Replies 2 · Apr 7, 2007

Replies: 2

Views: 3K

What is Einstein's thought experiment about special relativity?

Apr 6, 2007 · Replies 12 · Apr 6, 2007

Replies: 12

Views: 5K

Abraham Zelmanov's Chronometric Invariants

Apr 6, 2007 · Replies 1 · Apr 6, 2007

Replies: 1

Views: 3K

Could Time Dilation Make Us Age Differently on Other Planets?

Apr 5, 2007 · Replies 28 · Apr 6, 2007

Replies: 28

Views: 6K

Are There PDEs in Special Relativity?

Apr 5, 2007 · Replies 1 · Apr 5, 2007

Replies: 1

Views: 3K

Some Inertial Frames may br more Equivalnet than Others

Apr 4, 2007 · Replies 6 · Apr 5, 2007

Replies: 6

Views: 2K

Understanding Relativity: Increasing Speed

Apr 3, 2007 · Replies 9 · Apr 5, 2007

Replies: 9

Views: 4K

Two Body Problem: Exact Solutions?

Apr 3, 2007 · Replies 3 · Apr 4, 2007

Replies: 3

Views: 3K

I Need the explaination of The image of formation of black hole

Apr 1, 2007 · Replies 7 · Apr 3, 2007

Replies: 7

Views: 4K

If I swing my arm, it can emit gravitational waves?

Apr 3, 2007 · Replies 1 · Apr 3, 2007

Replies: 1

Views: 2K

Transforming Kinetic Energy: A Geometric Approach

Mar 31, 2007 · Replies 6 · Apr 2, 2007

Replies: 6

Views: 6K

Twin Paradox Theory: Explained for 9th Graders

Apr 1, 2007 · Replies 3 · Apr 2, 2007

Replies: 3

Views: 4K

Black hole entropy as a Noether Charge

Mar 28, 2007 · Replies 1 · Apr 2, 2007

Replies: 1

Views: 3K

Proving invariance of scalar product

Mar 31, 2007 · Replies 4 · Apr 1, 2007

Replies: 4

Views: 8K

Implications of geodesiacs(philosophical)

Mar 29, 2007 · Replies 25 · Mar 31, 2007

Replies: 25

Views: 5K

D'Alembertian question again (sorry)

Mar 30, 2007 · Replies 4 · Mar 31, 2007

Replies: 4

Views: 4K

Questions about the speed of light.

Mar 30, 2007 · Replies 7 · Mar 30, 2007

Replies: 7

Views: 3K

Question about Mass(special relativity)

Mar 29, 2007 · Replies 28 · Mar 30, 2007

Replies: 28

Views: 5K

Understanding the Detonator Paradox: A Relativity-Based Explanation

Mar 30, 2007 · Replies 2 · Mar 30, 2007

Replies: 2

Views: 3K

Confused by D'alembertian operator in EM

Mar 30, 2007 · Replies 2 · Mar 30, 2007

Replies: 2

Views: 3K

What is the material that allows transverse but not longitudinal waves?

Mar 28, 2007 · Replies 8 · Mar 30, 2007

Replies: 8

Views: 3K

Twin #1 is calling twin #2 in mid flight on instant-stellar phone

Mar 29, 2007 · Replies 10 · Mar 29, 2007

Replies: 10

Views: 4K

Metric versus Tetrad formulation of relativity

Mar 28, 2007 · Replies 3 · Mar 29, 2007

Replies: 3

Views: 4K

What is the Twin Paradox in General Relativity?

Mar 14, 2007 · Replies 12 · Mar 29, 2007

Replies: 12

Views: 4K

Grasping Special Relativity: Concept Understanding for 17yo

Mar 17, 2007 · Replies 17 · Mar 29, 2007

Replies: 17

Views: 4K

Starting to learn about General and special relativity

Mar 28, 2007 · Replies 2 · Mar 28, 2007

Replies: 2

Views: 2K

Double Special Relativity (DSR) fake or real?

Mar 27, 2007 · Replies 5 · Mar 28, 2007

Replies: 5

Views: 6K

Probably dumb question. problem understanding formula

Mar 13, 2007 · Replies 11 · Mar 27, 2007

Replies: 11

Views: 3K

Is there a way to intuitively understand proper time in special relativity?

Mar 25, 2007 · Replies 8 · Mar 27, 2007

Replies: 8

Views: 3K

The physical nature of spacetime

Mar 20, 2007 · Replies 36 · Mar 27, 2007

2

Replies: 36

Views: 7K

Doppler shift formula and the assumptions behind it

Mar 23, 2007 · Replies 8 · Mar 27, 2007

Replies: 8

Views: 6K

Is the first postulate necessary?

Mar 24, 2007 · Replies 10 · Mar 26, 2007

Replies: 10

Views: 3K

The Relativistic Mass-Energy Relationship

Mar 25, 2007 · Replies 24 · Mar 26, 2007

Replies: 24

Views: 18K

E=mc2 Energy converts to matter

Mar 25, 2007 · Replies 4 · Mar 26, 2007

Replies: 4

Views: 3K

Time dilation- V relative to what?

Mar 20, 2007 · Replies 12 · Mar 24, 2007

Replies: 12

Views: 4K

A question about constant acceleration close to the speed of light

Mar 22, 2007 · Replies 12 · Mar 24, 2007

Replies: 12

Views: 6K

Einstein's Field Equation Stress-Energy

Mar 21, 2007 · Replies 16 · Mar 23, 2007

Replies: 16

Views: 3K

Geodesic Deviation: Deriving Formula with Schtuz's Book

Mar 21, 2007 · Replies 2 · Mar 22, 2007

Replies: 2

Views: 3K

Is Simultaneity Absolute in Einstein's Theory of Relativity?

Mar 12, 2007 · Replies 56 · Mar 22, 2007

2

Replies: 56

Views: 9K

Inertial Frame R: Persisting Relationships of Particles' Positions & Velocities

Mar 21, 2007 · Replies 1 · Mar 21, 2007

Replies: 1

Views: 2K

Is this the fabric of the universe?

Mar 20, 2007 · Replies 1 · Mar 21, 2007

Replies: 1

Views: 3K

If a charged particle is free falling in the gravitational field-

Mar 13, 2007 · Replies 51 · Mar 21, 2007

2

Replies: 51

Views: 20K

What is the perception of mass compression during relative time in acceleration?

Mar 19, 2007 · Replies 12 · Mar 20, 2007

Replies: 12

Views: 3K

Invariance of uxw (velocityxphase velocity)

Mar 19, 2007 · Replies 9 · Mar 20, 2007

Replies: 9

Views: 3K

Linear algebra and tensors in GR

Mar 19, 2007 · Replies 1 · Mar 20, 2007

Replies: 1

Views: 2K

Visser: Lorentzian wormholes. From Einstein to Hawking 1996

Mar 18, 2007 · Replies 2 · Mar 19, 2007

Replies: 2

Views: 4K

A complete course in relativity.

Jan 30, 2007 · Replies 30 · Mar 19, 2007

2

Replies: 30

Views: 6K

Gravitational radiation reaction

Mar 19, 2007 · Replies 1 · Mar 19, 2007

Replies: 1

Views: 2K

Simultaneity, contraction and interval.

Mar 14, 2007 · Replies 11 · Mar 19, 2007

Replies: 11

Views: 3K

Earth-Based Gravity Wave Detectors: Exist, Effectiveness, Detection & Setup

Mar 17, 2007 · Replies 12 · Mar 18, 2007

Replies: 12

Views: 4K

Relative No-emission Propulsion

Mar 14, 2007 · Replies 5 · Mar 17, 2007

Replies: 5

Views: 2K

Principle of Relativity violation

Mar 16, 2007 · Replies 9 · Mar 16, 2007

Replies: 9

Views: 4K

How Can We Determine If Two Light Beams Are Emitted Simultaneously?

Mar 14, 2007 · Replies 5 · Mar 15, 2007

Replies: 5

Views: 3K

Location of new mass when added to grav system

Mar 13, 2007 · Replies 6 · Mar 14, 2007

Replies: 6

Views: 3K

Calculating Light Bending by Gravity: Can You Teach Me?

Mar 3, 2007 · Replies 23 · Mar 14, 2007

Replies: 23

Views: 7K

Whether a person will die or not is relative

Mar 13, 2007 · Replies 16 · Mar 14, 2007

Replies: 16

Views: 4K

Uncovering the Mystery of Photons, Mass, and Gravity for Beginners

Mar 13, 2007 · Replies 11 · Mar 14, 2007

Replies: 11

Views: 3K

Relativity Question: Length Contraction of Moving Boxes

Mar 13, 2007 · Replies 1 · Mar 13, 2007

Replies: 1

Views: 2K

Does Gravity Instantaneously Disappear When a Massive Object Vanishes?

Mar 5, 2007 · Replies 20 · Mar 13, 2007

Replies: 20

Views: 4K

Does Weight Change with Reference Frame? A Question Explored

Mar 11, 2007 · Replies 4 · Mar 13, 2007

Replies: 4

Views: 3K

Does the Gravitational Field Have Mass?

Mar 11, 2007 · Replies 5 · Mar 12, 2007

Replies: 5

Views: 3K

Lorentz-Transformation and time

Mar 9, 2007 · Replies 12 · Mar 12, 2007

Replies: 12

Views: 4K

Is a Photon a Point or an Energy?

Mar 12, 2007 · Replies 5 · Mar 12, 2007

Replies: 5

Views: 2K

Why C in Vacuum? Time Dilation Formula Explained

Feb 15, 2007 · Replies 43 · Mar 12, 2007

2

Replies: 43

Views: 6K

Link btw manifolds and space-time

Jan 30, 2007 · Replies 99 · Mar 11, 2007

4

Replies: 99

Views: 17K

How Would Headlights Behave If Your Car Traveled Faster Than Light?

Feb 19, 2007 · Replies 23 · Mar 11, 2007

Replies: 23

Views: 5K

Twin Paradox in 3-sphere (S^3)

Mar 5, 2007 · Replies 117 · Mar 11, 2007

4

Replies: 117

Views: 17K

What Does It Mean When We Say Spacetime Is Curved?

Mar 10, 2007 · Replies 11 · Mar 11, 2007

Replies: 11

Views: 3K

What Does \nabla_{[a}F_{bc]} Mean? Notation Question Answered!

Mar 10, 2007 · Replies 4 · Mar 10, 2007

Replies: 4

Views: 3K

Questions about kinetic energy and gravitation

Mar 10, 2007 · Replies 3 · Mar 10, 2007

Replies: 3

Views: 4K

Time elapsed for watch with crystal normal or parallel to g

Mar 10, 2007 · Replies 3 · Mar 10, 2007

Replies: 3

Views: 3K

Concept of the constant speed of light

Mar 8, 2007 · Replies 9 · Mar 10, 2007

Replies: 9

Views: 2K

The Speed of Light: If My Arms Were 10 Light Years Long

Mar 9, 2007 · Replies 10 · Mar 10, 2007

Replies: 10

Views: 3K

Poll

A simple observation regarding the equivalence of acceleration and gravity

Feb 15, 2007 · Replies 54 · Mar 10, 2007

2

Replies: 54

Views: 8K

Photons in the stationary wave?

Mar 6, 2007 · Replies 5 · Mar 10, 2007

Replies: 5

Views: 5K

Speed of Light Sucked into Black Hole

Mar 8, 2007 · Replies 14 · Mar 9, 2007

Replies: 14

Views: 3K

Experiencing time faster rathe than slower

Mar 9, 2007 · Replies 3 · Mar 9, 2007

Replies: 3

Views: 2K

Curvature and Geodesics in Space-Time: A Question on Photon Paths

Mar 8, 2007 · Replies 16 · Mar 8, 2007

Replies: 16

Views: 4K

Does every piece of information in the universe have mass?

Mar 7, 2007 · Replies 8 · Mar 8, 2007

Replies: 8

Views: 3K

Stupid question about page 70 in a first course in GR

Mar 4, 2007 · Replies 26 · Mar 8, 2007

Replies: 26

Views: 5K

How can we accurately measure the relative velocity between two moving bodies?

Feb 25, 2007 · Replies 39 · Mar 8, 2007

2

Replies: 39

Views: 6K

Near Light Velocity: Can Distances Shorten & Universe Appear Flattened?

Mar 6, 2007 · Replies 6 · Mar 7, 2007

Replies: 6

Views: 3K

Global Positioning System and Relativity

Dec 3, 2004 · Replies 17 · Mar 6, 2007

Replies: 17

Views: 4K

Question on Penrose diagram for Schwazschild metric

Mar 4, 2007 · Replies 9 · Mar 5, 2007

Replies: 9

Views: 3K

A possible question concerning the photon

Feb 25, 2007 · Replies 30 · Mar 4, 2007

2

Replies: 30

Views: 5K

The curvature cause by gravity implies absolute space?

Mar 18, 2006 · Replies 19 · Mar 4, 2007

Replies: 19

Views: 5K

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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