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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 Happens When You Fall Into a Black Hole?

Sep 5, 2004 · Replies 1 · Sep 12, 2004

Replies: 1

Views: 3K

The Speed of Light: Comparing to What?

Sep 11, 2004 · Replies 5 · Sep 11, 2004

Replies: 5

Views: 2K

String-mass near the speed of light

Aug 24, 2004 · Replies 8 · Sep 11, 2004

Replies: 8

Views: 3K

Hovering in gravity makes curved space flat?

Sep 10, 2004 · Replies 2 · Sep 11, 2004

Replies: 2

Views: 3K

Why are the fundamental postulates of special relativity controversial?

Sep 5, 2004 · Replies 7 · Sep 10, 2004

Replies: 7

Views: 3K

Quantum blended with a little SR

Aug 30, 2004 · Replies 5 · Sep 10, 2004

Replies: 5

Views: 2K

Christoffel symbols in the Schwarzschild metric

Sep 3, 2004 · Replies 1 · Sep 10, 2004

Replies: 1

Views: 10K

How Small Could the Universe Get in a Big Crunch?

Sep 1, 2004 · Replies 2 · Sep 9, 2004

Replies: 2

Views: 3K

What are some suggestions for books on general relativity at the graduate level?

Sep 7, 2004 · Replies 12 · Sep 9, 2004

Replies: 12

Views: 6K

Settle a Dispute: Falling Objects & Relativity

Aug 27, 2004 · Replies 28 · Sep 9, 2004

Replies: 28

Views: 7K

What causes the bending of space and time by concentrations of mass and energy?

Aug 28, 2004 · Replies 22 · Sep 8, 2004

Replies: 22

Views: 9K

Is length contraction relative or absolute?

Aug 29, 2004 · Replies 10 · Sep 6, 2004

Replies: 10

Views: 4K

A New Test of the Equivalence Principle?

Sep 1, 2004 · Replies 22 · Sep 5, 2004

Replies: 22

Views: 5K

Maxwell equations and special relativety

Sep 3, 2004 · Replies 3 · Sep 5, 2004

Replies: 3

Views: 3K

Answering Questions on Speeds & Waves in Relativistic Space

Sep 4, 2004 · Replies 2 · Sep 4, 2004

Replies: 2

Views: 3K

Can an astronaut actually reach the singularity of a finite lifetime black hole?

Sep 2, 2004 · Replies 7 · Sep 4, 2004

Replies: 7

Views: 2K

Does Traveling at Light Speed Reveal More of the Universe?

Aug 27, 2004 · Replies 2 · Sep 4, 2004

Replies: 2

Views: 3K

Solving Problem 2-8: Relative Velocity and Time Elapses

Sep 2, 2004 · Replies 2 · Sep 3, 2004

Replies: 2

Views: 2K

Interpretation of GR: Change in Einstein's Understanding

Aug 31, 2004 · Replies 11 · Sep 2, 2004

Replies: 11

Views: 4K

Relativity and fuel consumption

Aug 31, 2004 · Replies 6 · Sep 1, 2004

Replies: 6

Views: 3K

Answering Relativity Questions: Earth, Spacecraft, Lorentz Transforms

Aug 31, 2004 · Replies 2 · Aug 31, 2004

Replies: 2

Views: 6K

The Sled and the Hole Paradox in Special and General Relativity Explained

Aug 29, 2004 · Replies 12 · Aug 31, 2004

Replies: 12

Views: 3K

If Time and Space Are Relative Concepts, Then

Aug 24, 2004 · Replies 17 · Aug 31, 2004

Replies: 17

Views: 4K

Schwarzschild metric and BH mass

Aug 17, 2004 · Replies 78 · Aug 30, 2004

3

Replies: 78

Views: 11K

Is Block Time in General Relativity Proof of a Fixed Future or Many-Worlds?

Aug 20, 2004 · Replies 23 · Aug 30, 2004

Replies: 23

Views: 5K

The End of the Universe from the Outside In - as free-faller nears singularity

Aug 22, 2004 · Replies 2 · Aug 30, 2004

Replies: 2

Views: 3K

Time & Acceleration: A Relativity Puzzle

Aug 23, 2004 · Replies 25 · Aug 29, 2004

Replies: 25

Views: 4K

The Speed of Light: Relative to Us?

Aug 24, 2004 · Replies 44 · Aug 29, 2004

2

Replies: 44

Views: 6K

How Does Earth's Rotation Speed Influence Frame Dragging Effects?

Aug 22, 2004 · Replies 2 · Aug 29, 2004

Replies: 2

Views: 3K

How Do Time Cones Illustrate the Concept of Space-Time?

Aug 28, 2004 · Replies 2 · Aug 29, 2004

Replies: 2

Views: 2K

Evidence of length contraction

Aug 22, 2004 · Replies 7 · Aug 28, 2004

Replies: 7

Views: 5K

Bee Swarm Relativity: Calculating Time with a Messenger Bee

Aug 26, 2004 · Replies 2 · Aug 26, 2004

Replies: 2

Views: 2K

Spaceship accelerating inside a Black Hole

Aug 26, 2004 · Replies 7 · Aug 26, 2004

Replies: 7

Views: 4K

Time Before Time: Physics Paper Clarifications

Aug 25, 2004 · Replies 2 · Aug 26, 2004

Replies: 2

Views: 2K

Older faster if the universe wouldn't be expanding?

Aug 14, 2004 · Replies 4 · Aug 25, 2004

Replies: 4

Views: 3K

There is only one True Singularity and It is at the Center

Aug 22, 2004 · Replies 43 · Aug 25, 2004

2

Replies: 43

Views: 7K

What is a time-like killing vector?

Aug 25, 2004 · Replies 4 · Aug 25, 2004

Replies: 4

Views: 16K

What is the Unverifiable Nature of Black Hole Internal States?

Aug 23, 2004 · Replies 6 · Aug 25, 2004

Replies: 6

Views: 3K

Why does gravity rotate with the Earth?

Aug 23, 2004 · Replies 8 · Aug 24, 2004

Replies: 8

Views: 3K

Change in relativistic momentum

Aug 21, 2004 · Replies 5 · Aug 24, 2004

Replies: 5

Views: 3K

Question about how we look at space

Aug 23, 2004 · Replies 33 · Aug 24, 2004

2

Replies: 33

Views: 4K

Gravitation Speed/Acceleration/Velocity

Aug 13, 2004 · Replies 7 · Aug 24, 2004

Replies: 7

Views: 7K

Is Action at a Distance Compatible with Quantum Mechanics and Relativity?

Aug 23, 2004 · Replies 4 · Aug 23, 2004

Replies: 4

Views: 5K

What software do people use for tensor manipulation in general relativity?

Aug 22, 2004 · Replies 2 · Aug 23, 2004

Replies: 2

Views: 3K

E = mc^2: Identity or equality

Aug 23, 2004 · Replies 2 · Aug 23, 2004

Replies: 2

Views: 2K

Is gravity really just acceleration? And what about gravitons?

Aug 23, 2004 · Replies 2 · Aug 23, 2004

Replies: 2

Views: 3K

Calculating mass and speed from kinetic energy and linear momentum

Aug 21, 2004 · Replies 12 · Aug 23, 2004

Replies: 12

Views: 16K

Special Relativity. timespace correlation.

Aug 21, 2004 · Replies 10 · Aug 21, 2004

Replies: 10

Views: 3K

Can particles traveling near the speed of light create a time reversal effect?

Aug 19, 2004 · Replies 28 · Aug 21, 2004

Replies: 28

Views: 6K

How Does Dark Energy Exert Pressure in the Universe?

Aug 21, 2004 · Replies 5 · Aug 21, 2004

Replies: 5

Views: 3K

Event Horizon vs Singularity: Are They the Same Thing in Black Hole Physics?

Aug 14, 2004 · Replies 2 · Aug 21, 2004

Replies: 2

Views: 4K

What Determines the Direction of Space Curvature by Mass in General Relativity?

Aug 19, 2004 · Replies 6 · Aug 21, 2004

Replies: 6

Views: 3K

Time flow & Cosmic Background Radiation

Aug 12, 2004 · Replies 12 · Aug 20, 2004

Replies: 12

Views: 4K

Question about expanding black holes

Aug 18, 2004 · Replies 7 · Aug 20, 2004

Replies: 7

Views: 3K

Can two events be perceived in reverse order due to relativistic effects?

Aug 20, 2004 · Replies 7 · Aug 20, 2004

Replies: 7

Views: 4K

Escape velocity outside event horizon

Aug 19, 2004 · Replies 6 · Aug 20, 2004

Replies: 6

Views: 3K

Can a falling feather inside a rocket ship create a black hole?

Aug 18, 2004 · Replies 6 · Aug 20, 2004

Replies: 6

Views: 3K

Why Doesn't a Photon's Energy Knock Us Out?

Aug 17, 2004 · Replies 35 · Aug 20, 2004

2

Replies: 35

Views: 6K

Conservation of energy in GR and symmetry

Aug 19, 2004 · Replies 12 · Aug 20, 2004

Replies: 12

Views: 3K

Can an Accelerating Universe Rotate According to GR Principles?

Aug 15, 2004 · Replies 14 · Aug 19, 2004

Replies: 14

Views: 3K

Into the past ?: Tricky SpaceTime Diagrams?

Aug 16, 2004 · Replies 7 · Aug 19, 2004

Replies: 7

Views: 4K

Is This Explanation of Black Holes Accurate According to Mainstream Theory?

Aug 18, 2004 · Replies 9 · Aug 19, 2004

Replies: 9

Views: 3K

Those who use relativistic mass and why

Jul 25, 2004 · Replies 89 · Aug 19, 2004

3

Replies: 89

Views: 13K

Are There Any Alternative Models to Explain Gravity?

Aug 18, 2004 · Replies 2 · Aug 19, 2004

Replies: 2

Views: 2K

Stresses in a rotating object?

Aug 18, 2004 · Replies 2 · Aug 18, 2004

Replies: 2

Views: 3K

Measuring the Speed of Light from Distant Sources: How Do We Know It's Constant?

Aug 17, 2004 · Replies 4 · Aug 18, 2004

Replies: 4

Views: 3K

Matter Forms Space & Time is Relative Motion

Aug 11, 2004 · Replies 2 · Aug 18, 2004

Replies: 2

Views: 4K

How can we explain special relativity to skeptics?

Aug 16, 2004 · Replies 13 · Aug 17, 2004

Replies: 13

Views: 4K

Solving the Twins Paradox: Could Einstein be Wrong?

Aug 17, 2004 · Replies 8 · Aug 17, 2004

Replies: 8

Views: 3K

Can an Arbitrary Co-ordinate System Be Used for Observers in GR?

Aug 15, 2004 · Replies 12 · Aug 17, 2004

Replies: 12

Views: 3K

The fundenental law of relativity

Aug 13, 2004 · Replies 21 · Aug 17, 2004

Replies: 21

Views: 5K

Oh My God Particle - Fourmilab

Aug 5, 2004 · Replies 2 · Aug 16, 2004

Replies: 2

Views: 2K

Is Time Travel Backwards Theoretically Possible?

Aug 15, 2004 · Replies 7 · Aug 16, 2004

Replies: 7

Views: 3K

Infinitie tidal forces at event horizon?

Aug 14, 2004 · Replies 3 · Aug 14, 2004

Replies: 3

Views: 4K

What Are the Key Properties of Tensor Equations in General Relativity?

Aug 12, 2004 · Replies 12 · Aug 14, 2004

Replies: 12

Views: 16K

Can Special Relativity's Equations Be Modified to Avoid Infinities and Zeroes?

Jul 26, 2004 · Replies 25 · Aug 13, 2004

Replies: 25

Views: 4K

Calculating Relative Speed in 2D: Solving for Gamma with Two Spaceships

Aug 12, 2004 · Replies 11 · Aug 13, 2004

Replies: 11

Views: 4K

Relativity Question: Two spaceships following each other near C

Aug 13, 2004 · Replies 5 · Aug 13, 2004

Replies: 5

Views: 4K

What Would Sound Like at the Speed of Light?

Aug 9, 2004 · Replies 5 · Aug 13, 2004

Replies: 5

Views: 3K

Spacetime and Euclidean Geometry-Jacobson

Aug 10, 2004 · Replies 2 · Aug 12, 2004

Replies: 2

Views: 3K

Speed light travels on earth and in our solar system

Aug 11, 2004 · Replies 2 · Aug 12, 2004

Replies: 2

Views: 3K

Question about the metric tensor in Einstein's field equations.

Aug 11, 2004 · Replies 3 · Aug 12, 2004

Replies: 3

Views: 3K

Practical Use For Length Contraction?

Aug 11, 2004 · Replies 13 · Aug 12, 2004

Replies: 13

Views: 6K

Can Humans See Bodies Traveling at the Speed of Light?

Jul 29, 2004 · Replies 26 · Aug 12, 2004

Replies: 26

Views: 9K

Latest Developments on Black and White Hole-Theory and Anti-Gravity

Aug 10, 2004 · Replies 10 · Aug 12, 2004

Replies: 10

Views: 3K

Matter <--> Energy Conversions: A Phase Transition?

Aug 9, 2004 · Replies 4 · Aug 12, 2004

Replies: 4

Views: 2K

Can Matter and Energy Truly Be Annihilated According to Relativity?

Aug 8, 2004 · Replies 7 · Aug 11, 2004

Replies: 7

Views: 3K

Do Gravitons Play a Role in Simulated Gravity on a Rotating Spacestation?

Aug 9, 2004 · Replies 3 · Aug 11, 2004

Replies: 3

Views: 3K

Do Einstein's Theories of Relativity Contradict Each Other?

Jul 25, 2004 · Replies 70 · Aug 11, 2004

3

Replies: 70

Views: 9K

Does relativistic mass have a gravitational component?

Jul 20, 2004 · Replies 60 · Aug 10, 2004

3

Replies: 60

Views: 10K

Is Time a Mobius Dimension in Relativity Theory?

Aug 8, 2004 · Replies 8 · Aug 9, 2004

Replies: 8

Views: 4K

The Pinwheel Paradox: What's the Solution?

Jul 29, 2004 · Replies 19 · Aug 9, 2004

Replies: 19

Views: 5K

Shape of the Universe: Conditions for Viable Theory

Jul 15, 2004 · Replies 17 · Aug 9, 2004

Replies: 17

Views: 5K

Theories of Relativity: Analogon

Aug 8, 2004 · Replies 5 · Aug 9, 2004

Replies: 5

Views: 3K

How Does Water Slow Down Light Without Violating Special Relativity?

Aug 2, 2004 · Replies 2 · Aug 9, 2004

Replies: 2

Views: 2K

GR: A First Course in General Relativity

Jul 14, 2004 · Replies 22 · Aug 9, 2004

Replies: 22

Views: 7K

Does G.Relativity Violate Energy Basics?

Aug 1, 2004 · Replies 27 · Aug 9, 2004

Replies: 27

Views: 4K

Explaining C: How Space Changes with Speed

Jul 17, 2004 · Replies 105 · Aug 8, 2004

4

Replies: 105

Views: 13K

Train Experiment: Does Simultaneity Depend on Frame of Reference?

Aug 4, 2004 · Replies 11 · Aug 7, 2004

Replies: 11

Views: 3K

How Does Einstein's Theory Explain the Nature of Space?

Jul 31, 2004 · Replies 22 · Aug 7, 2004

Replies: 22

Views: 4K

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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