Menu

Navigation

More options

Style variation

Contact us

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.

Filters

Why is Relativity still a theory?

Nov 22, 2005 · Replies 20 · Nov 22, 2005

Replies: 20

Views: 16K

How do we know Gravity Moves the Speed of Light?

Nov 18, 2005 · Replies 11 · Nov 22, 2005

Replies: 11

Views: 4K

Could Faster-Than-Light Travel Create Time Dilation Effects?

Nov 17, 2005 · Replies 14 · Nov 21, 2005

Replies: 14

Views: 8K

Can a black hole form using only photons - in theory?

Nov 21, 2005 · Replies 9 · Nov 21, 2005

Replies: 9

Views: 4K

Relativistic physics of space?

Nov 20, 2005 · Replies 5 · Nov 21, 2005

Replies: 5

Views: 2K

Energy Acceleration: Electron Mass at C?

Nov 20, 2005 · Replies 2 · Nov 21, 2005

Replies: 2

Views: 2K

Why do we judge time by light?

Nov 3, 2005 · Replies 35 · Nov 20, 2005

2

Replies: 35

Views: 5K

How far back in time can we see?

Nov 15, 2005 · Replies 5 · Nov 19, 2005

Replies: 5

Views: 8K

How Does the Speed of Light Affect Observed Particle Trajectories?

Nov 16, 2005 · Replies 16 · Nov 19, 2005

Replies: 16

Views: 3K

What Are the Best Textbooks for Understanding Special Relativity?

Nov 17, 2005 · Replies 3 · Nov 18, 2005

Replies: 3

Views: 9K

Stability of 4D Gravity Model: Examining Possibilities

Nov 17, 2005 · Replies 2 · Nov 18, 2005

Replies: 2

Views: 5K

Speed of Light Exceeded: Debunking the Controversial Claim

Nov 18, 2005 · Replies 1 · Nov 18, 2005

Replies: 1

Views: 2K

Does Length Contraction Affect the Wavelength of Light from a Moving Source?

Nov 17, 2005 · Replies 1 · Nov 17, 2005

Replies: 1

Views: 3K

What happens when two photons travel at the speed of light?

Oct 26, 2005 · Replies 40 · Nov 17, 2005

2

Replies: 40

Views: 14K

Light Relativity Questions - Explained

Nov 17, 2005 · Replies 10 · Nov 17, 2005

Replies: 10

Views: 2K

Relativity Paradox: Resolving Hand-Waving Questions

Nov 11, 2005 · Replies 3 · Nov 17, 2005

Replies: 3

Views: 3K

The Potential Problems with Tachyons in Our Universe

Nov 16, 2005 · Replies 11 · Nov 17, 2005

Replies: 11

Views: 3K

Can a Car Travel Faster Than Light?

Sep 17, 2005 · Replies 13 · Nov 17, 2005

Replies: 13

Views: 3K

Lorentz Transformation: What Is It and How To Use It?

Nov 14, 2005 · Replies 12 · Nov 17, 2005

Replies: 12

Views: 4K

Falling Feet First into a Black Hole

Nov 16, 2005 · Replies 4 · Nov 16, 2005

Replies: 4

Views: 2K

What Unique Insights Does Wald Offer on Teaching General Relativity?

Nov 15, 2005 · Replies 2 · Nov 16, 2005

Replies: 2

Views: 3K

Picture a small mass orbiting around a large mass

Nov 5, 2005 · Replies 22 · Nov 16, 2005

Replies: 22

Views: 5K

High speeds - becoming a black hole

Nov 14, 2005 · Replies 34 · Nov 15, 2005

2

Replies: 34

Views: 7K

Could Light Speed Fluctuate Due to Transfer of Inertial Reference Frames?

Nov 14, 2005 · Replies 6 · Nov 15, 2005

Replies: 6

Views: 3K

Relative Nature of Time: Is it True?

Nov 14, 2005 · Replies 4 · Nov 15, 2005

Replies: 4

Views: 4K

When the station comes to the train?

Nov 13, 2005 · Replies 9 · Nov 15, 2005

Replies: 9

Views: 3K

Speed of Light: Path in Gravity Well & Denser Medium

Nov 14, 2005 · Replies 3 · Nov 14, 2005

Replies: 3

Views: 2K

Advanced books/papers on derivation of Newtonian mechanics from GR

Sep 15, 2005 · Replies 92 · Nov 14, 2005

4

Replies: 92

Views: 12K

Is c the fastest known velocity?

Nov 8, 2005 · Replies 22 · Nov 13, 2005

Replies: 22

Views: 4K

Where Can I Find Resources on Einstein's Field Equations and Their Context?

Oct 26, 2005 · Replies 23 · Nov 13, 2005

Replies: 23

Views: 4K

How Does Mass Increase When Accelerating to the Speed of Light?

Nov 11, 2005 · Replies 21 · Nov 12, 2005

Replies: 21

Views: 5K

Does the Mass Density of an Object Change When Approaching the Speed of Light?

Nov 10, 2005 · Replies 6 · Nov 12, 2005

Replies: 6

Views: 5K

Is time in the universe constant?

Nov 10, 2005 · Replies 3 · Nov 12, 2005

Replies: 3

Views: 4K

Wormholes and energy conservation

Nov 9, 2005 · Replies 11 · Nov 11, 2005

Replies: 11

Views: 8K

Is mass dependent on the observer?

Nov 11, 2005 · Replies 3 · Nov 11, 2005

Replies: 3

Views: 3K

Does a Muon Centrifuge Experiment Show Gravitational Time Effects?

Oct 25, 2005 · Replies 19 · Nov 10, 2005

Replies: 19

Views: 4K

Why Is Newton's Constant Used in Planck Units?

Nov 5, 2005 · Replies 9 · Nov 10, 2005

Replies: 9

Views: 3K

Time dilation and infinite speed

Nov 2, 2005 · Replies 25 · Nov 9, 2005

Replies: 25

Views: 7K

Globally Hyperbolic Spacetime: What Is It?

Nov 2, 2005 · Replies 6 · Nov 9, 2005

Replies: 6

Views: 7K

Does Photon Age Change in Different Mediums?

Nov 6, 2005 · Replies 16 · Nov 9, 2005

Replies: 16

Views: 4K

How Does Light Speed Change in Relativity?

Nov 1, 2005 · Replies 7 · Nov 8, 2005

Replies: 7

Views: 2K

Is Gravitational Potential Energy Not Really Energy for Photons?

Nov 1, 2005 · Replies 17 · Nov 8, 2005

Replies: 17

Views: 3K

New Bee question on Gauss Coordinates systems

Nov 6, 2005 · Replies 5 · Nov 8, 2005

Replies: 5

Views: 4K

Unraveling the Mysterious Energy Gained from a Black Hole

Nov 2, 2005 · Replies 10 · Nov 6, 2005

Replies: 10

Views: 6K

Object Shortening: Causes & Similarities to Time Dilation

Nov 4, 2005 · Replies 8 · Nov 6, 2005

Replies: 8

Views: 3K

Relativity and the Dark Energy question

Nov 22, 2004 · Replies 5 · Nov 5, 2005

Replies: 5

Views: 4K

Why Does the Standard Kinetic Energy Formula Fail at High Velocities?

Nov 5, 2005 · Replies 1 · Nov 5, 2005

Replies: 1

Views: 2K

Relativity: Understanding Potential | Explainer

Nov 1, 2005 · Replies 10 · Nov 5, 2005

Replies: 10

Views: 3K

Is momentum conserved in all inertial frames?

Nov 4, 2005 · Replies 6 · Nov 4, 2005

Replies: 6

Views: 4K

Could any curved space be a cut in a higher-dimensional flat space ?

Nov 4, 2005 · Replies 11 · Nov 4, 2005

Replies: 11

Views: 6K

How do GR effects influence escape velocity in stars and black holes?

Oct 26, 2005 · Replies 19 · Nov 4, 2005

Replies: 19

Views: 4K

Gaining Kinetic Energy Through Time: Explained

Oct 26, 2005 · Replies 86 · Nov 3, 2005

3

Replies: 86

Views: 11K

Understanding Metric Tensors in Riemannian Spaces

Nov 3, 2005 · Replies 6 · Nov 3, 2005

Replies: 6

Views: 3K

Pushing Pole: When Will Opposite End Move?

Oct 30, 2005 · Replies 9 · Nov 2, 2005

Replies: 9

Views: 2K

Idea of increased mass at relativistic speeds

Aug 13, 2005 · Replies 103 · Nov 2, 2005

4

Replies: 103

Views: 15K

Simultaneity in Special relativity

Oct 31, 2005 · Replies 4 · Nov 1, 2005

Replies: 4

Views: 3K

What Happens When a Light-Year-Long Wall Travels at Near Light Speed?

Oct 30, 2005 · Replies 8 · Nov 1, 2005

Replies: 8

Views: 3K

Proof of Gravity Waves Energy: Richard Feymann's Beads on a Rod

Oct 28, 2005 · Replies 4 · Nov 1, 2005

Replies: 4

Views: 6K

Length Contraction & Molecular Structure Effects

Oct 31, 2005 · Replies 5 · Oct 31, 2005

Replies: 5

Views: 3K

Paralel universe and Warping of Space Questions

Oct 30, 2005 · Replies 1 · Oct 30, 2005

Replies: 1

Views: 6K

Garth & Einstein: Examining Rotational Mass & Spacetime Distortion

Oct 30, 2005 · Replies 2 · Oct 30, 2005

Replies: 2

Views: 3K

Supplies Paradox Help: Solving Lorentz Contraction

Oct 5, 2005 · Replies 8 · Oct 30, 2005

Replies: 8

Views: 2K

Is Light's Speed Truly Constant in All Frames of Reference?

Oct 30, 2005 · Replies 1 · Oct 30, 2005

Replies: 1

Views: 6K

Understanding the Paradox of Mass in Relativity | Physics World

Oct 29, 2005 · Replies 3 · Oct 30, 2005

Replies: 3

Views: 2K

Physics Theories: Do Photons Have Mass in Motion?

Oct 26, 2005 · Replies 9 · Oct 29, 2005

Replies: 9

Views: 3K

Breaking the Sound Barrier: Ze Optical Boom by Albert Einstein ze Sird

Oct 22, 2005 · Replies 19 · Oct 29, 2005

Replies: 19

Views: 5K

The Secrets of Antimatter and Fast Propelling Technology

Oct 23, 2005 · Replies 6 · Oct 28, 2005

Replies: 6

Views: 2K

GR & Coriolis Forces: Inertial Trajectories & Resources

Oct 21, 2005 · Replies 4 · Oct 28, 2005

Replies: 4

Views: 2K

Simplest question to articulate concepts in General Relativity

Oct 27, 2005 · Replies 2 · Oct 27, 2005

Replies: 2

Views: 2K

Question about rotating frames

Oct 27, 2005 · Replies 7 · Oct 27, 2005

Replies: 7

Views: 2K

STR, one-way speed of light and conventionality

Oct 24, 2005 · Replies 16 · Oct 27, 2005

Replies: 16

Views: 4K

4D spacetime Light cone Twins paradox

Oct 26, 2005 · Replies 30 · Oct 27, 2005

2

Replies: 30

Views: 6K

Solve Eq. (9.58) on Schutz Page 246 - A First Course in GR

Oct 25, 2005 · Replies 2 · Oct 27, 2005

Replies: 2

Views: 2K

How Can Light Have Speed Yet Be Timeless?

Oct 26, 2005 · Replies 8 · Oct 27, 2005

Replies: 8

Views: 2K

Old Book Review - Classical Charged Particles

Oct 22, 2005 · Replies 1 · Oct 26, 2005

Replies: 1

Views: 3K

What causes the apparent falling of objects in general relativity?

Oct 24, 2005 · Replies 13 · Oct 26, 2005

Replies: 13

Views: 4K

Can Chromatic Aberration Create Gravitational Fields?

Oct 10, 2005 · Replies 20 · Oct 25, 2005

Replies: 20

Views: 5K

Exploring the Mass and Temperature of a Slower Photon: Half the Speed of Light

Oct 4, 2005 · Replies 3 · Oct 24, 2005

Replies: 3

Views: 4K

Acceleration Due to Gravity: Facts & Qs

Oct 23, 2005 · Replies 12 · Oct 24, 2005

Replies: 12

Views: 3K

How to Calculate the Length of Energy-Momentum Four-Vectors?

Oct 22, 2005 · Replies 5 · Oct 24, 2005

Replies: 5

Views: 3K

Is light necessary for the existence of spacetime?

Oct 22, 2005 · Replies 5 · Oct 23, 2005

Replies: 5

Views: 3K

Is the Maximum Magnetic Field in Neutron Stars Related to Spacetime Curvature?

Oct 23, 2005 · Replies 1 · Oct 23, 2005

Replies: 1

Views: 4K

Origin of 4-momentum - Hisorical Ref.

Oct 23, 2005 · Replies 4 · Oct 23, 2005

Replies: 4

Views: 2K

Solving Schutz Problem 23 (a & b): T^{\mu ν} Identity

Oct 22, 2005 · Replies 6 · Oct 22, 2005

Replies: 6

Views: 5K

What happens to time near a black hole's event horizon?

Oct 22, 2005 · Replies 2 · Oct 22, 2005

Replies: 2

Views: 18K

How Does Relativity Affect Perception of Time and Space?

Oct 22, 2005 · Replies 3 · Oct 22, 2005

Replies: 3

Views: 3K

Relativity and the Laser Beam: Is Faster-Than-Light Travel Possible?

Oct 20, 2005 · Replies 4 · Oct 22, 2005

Replies: 4

Views: 2K

The Limitless Fascination of Black Hole Mass: How Big Can It Get?

Oct 21, 2005 · Replies 11 · Oct 22, 2005

Replies: 11

Views: 3K

Acceleration in Special Relativity

Oct 21, 2005 · Replies 4 · Oct 22, 2005

Replies: 4

Views: 4K

Geometry and the Universe - A symposium on GR

Oct 19, 2005 · Replies 2 · Oct 21, 2005

Replies: 2

Views: 4K

Gravity Probe-B Completes Mission

Oct 11, 2005 · Replies 7 · Oct 21, 2005

Replies: 7

Views: 2K

Question posed in a science magazine

Oct 17, 2005 · Replies 6 · Oct 20, 2005

Replies: 6

Views: 12K

GR: A First Course Q: What is "That Region" on Page 226?

Oct 18, 2005 · Replies 4 · Oct 19, 2005

Replies: 4

Views: 3K

Does the Force Propelling a Spaceship Affect the Speed of Light Emitted from It?

Oct 18, 2005 · Replies 1 · Oct 18, 2005

Replies: 1

Views: 2K

Another Speed Of Light Travel Scenario

Oct 18, 2005 · Replies 5 · Oct 18, 2005

Replies: 5

Views: 3K

Schutz, page 226 - Black hole formation

Oct 13, 2005 · Replies 8 · Oct 17, 2005

Replies: 8

Views: 3K

Unification of space and matter

Oct 16, 2005 · Replies 5 · Oct 17, 2005

Replies: 5

Views: 3K

Why is the speed of light what it is?

Oct 17, 2005 · Replies 3 · Oct 17, 2005

Replies: 3

Views: 2K

GR Contest: Uncovering the First Evidence of Revision

Oct 12, 2005 · Replies 8 · Oct 16, 2005

Replies: 8

Views: 2K

Verifying Equations 9.45 & 9.46 in Schutz, pg. 224

Oct 13, 2005 · Replies 2 · Oct 16, 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.

Top