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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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Undergrad Invariant Quantities in SR: Explained

Mar 24, 2011 · Replies 7 · Mar 26, 2011

Replies: 7

Views: 11K

Graduate How does the length contraction work for proper length?

Mar 25, 2011 · Replies 8 · Mar 26, 2011

Replies: 8

Views: 4K

Graduate What happens to density as speed increases?

Mar 24, 2011 · Replies 5 · Mar 26, 2011

Replies: 5

Views: 13K

Undergrad If Earth's orbital speed doubled, would its mass and gravity double?

Mar 24, 2011 · Replies 13 · Mar 25, 2011

Replies: 13

Views: 6K

Graduate 'Mass' of an object at different positions in a weak gravitational field

Mar 14, 2011 · Replies 40 · Mar 25, 2011

2

Replies: 40

Views: 7K

Graduate Spacetime curvature: Real or Not?

Mar 25, 2011 · Replies 23 · Mar 25, 2011

Replies: 23

Views: 4K

Graduate Kinetic energy and curved space-time

Mar 24, 2011 · Replies 4 · Mar 25, 2011

Replies: 4

Views: 3K

Undergrad Why Do People Age Slower When Traveling Near the Speed of Light?

Feb 6, 2008 · Replies 28 · Mar 25, 2011

Replies: 28

Views: 46K

Graduate Understanding Special Relativity: Train Example and Time Dilation Explained

Mar 25, 2011 · Replies 5 · Mar 25, 2011

Replies: 5

Views: 3K

Graduate Dynamics of self-gravitating dust

Mar 24, 2011 · Replies 3 · Mar 25, 2011

Replies: 3

Views: 2K

Graduate Why does a key drop to the floor when released from my hand?

Dec 21, 2003 · Replies 9 · Mar 25, 2011

Replies: 9

Views: 3K

Graduate Does Heat Energy Increase the Rest Mass of a Substance?

Mar 24, 2011 · Replies 4 · Mar 24, 2011

Replies: 4

Views: 2K

Graduate Angular velocity and c: Is this a paradox? Can you explain it?

Mar 24, 2011 · Replies 8 · Mar 24, 2011

Replies: 8

Views: 2K

Undergrad Is Mass Really Condensed Energy

Jun 17, 2006 · Replies 23 · Mar 24, 2011

Replies: 23

Views: 12K

Graduate Fizeau. What is connection between fringe shifts and velocity?

Mar 23, 2011 · Replies 16 · Mar 23, 2011

Replies: 16

Views: 4K

Graduate Question about event horizon and Rindler space

Mar 21, 2011 · Replies 5 · Mar 23, 2011

Replies: 5

Views: 5K

Graduate Time dilation yes, why no contraction?

Mar 23, 2011 · Replies 4 · Mar 23, 2011

Replies: 4

Views: 2K

Graduate Is the Reissner-Nordström repulsion real?

Mar 21, 2011 · Replies 5 · Mar 23, 2011

Replies: 5

Views: 4K

Graduate The origin of the inverse square law

Mar 21, 2011 · Replies 24 · Mar 22, 2011

Replies: 24

Views: 8K

Graduate Communicating Through Time: MacBeath & Nahin's Ideas

Feb 24, 2011 · Replies 24 · Mar 22, 2011

Replies: 24

Views: 5K

Graduate Gravitation of moving objects

Mar 22, 2011 · Replies 1 · Mar 22, 2011

Replies: 1

Views: 2K

Graduate The question is: Can GR be derived from the Einstein-Hilbert action?

Mar 15, 2011 · Replies 16 · Mar 22, 2011

Replies: 16

Views: 3K

Graduate Faster than light travel: it either constantly happens or never

Mar 20, 2011 · Replies 9 · Mar 22, 2011

Replies: 9

Views: 3K

Undergrad Cause of Gravitation: What Is It?

Mar 19, 2011 · Replies 3 · Mar 22, 2011

Replies: 3

Views: 1K

Graduate Antigravity in General Relativity

Mar 20, 2011 · Replies 8 · Mar 22, 2011

Replies: 8

Views: 4K

Graduate Clock Acceleration in a Spacecraft: Calculating Variation Post-Acceleration

Mar 21, 2011 · Replies 1 · Mar 21, 2011

Replies: 1

Views: 2K

Graduate Diffeomorphism and constant curvature

Mar 14, 2011 · Replies 22 · Mar 21, 2011

Replies: 22

Views: 5K

Graduate How to obtain Kerr Metric via Spinors (N-P Formalism)

Mar 20, 2011 · Replies 5 · Mar 21, 2011

Replies: 5

Views: 3K

Graduate Galilei, Poincare and conformal symmetry

Mar 20, 2011 · Replies 3 · Mar 20, 2011

Replies: 3

Views: 2K

Graduate Why do we perceive time to pass at the rate that we do?

Mar 11, 2011 · Replies 23 · Mar 20, 2011

Replies: 23

Views: 7K

Graduate On the Physical Separation of Time

Dec 22, 2010 · Replies 70 · Mar 20, 2011

3

Replies: 70

Views: 8K

Graduate How can I Bel-decompose the Riemann tensor over SO(3,3)?

Mar 18, 2011 · Replies 4 · Mar 20, 2011

Replies: 4

Views: 3K

Graduate The Lorentz Transformations and the Uncertainty Principle

Mar 13, 2011 · Replies 3 · Mar 20, 2011

Replies: 3

Views: 2K

Graduate Having trouble writing down a metric in terms of metric tensor in matrix form?

Mar 19, 2011 · Replies 4 · Mar 19, 2011

Replies: 4

Views: 5K

Graduate Is Gravity Really a Force or Something Else?

Mar 15, 2011 · Replies 9 · Mar 19, 2011

Replies: 9

Views: 3K

High School The Constant Speed of Free Falling Objects

Mar 19, 2011 · Replies 3 · Mar 19, 2011

Replies: 3

Views: 3K

Graduate E & M Magnetism Relativity Paradox

Feb 21, 2011 · Replies 19 · Mar 19, 2011

Replies: 19

Views: 6K

Undergrad Could Zero Distance Create Infinite Gravitational Force?

Mar 18, 2011 · Replies 6 · Mar 19, 2011

Replies: 6

Views: 3K

Undergrad E=mc^2 Explained: Momentum and c

Mar 17, 2011 · Replies 21 · Mar 19, 2011

Replies: 21

Views: 10K

Graduate Is atom created if time is taken away from space and acceleration?

Mar 6, 2011 · Replies 17 · Mar 19, 2011

Replies: 17

Views: 4K

Graduate Surviving the event horizon: some thoughts

Mar 15, 2011 · Replies 15 · Mar 18, 2011

Replies: 15

Views: 3K

Graduate Rest Mass and Preferred Frame of Reference

Mar 13, 2011 · Replies 5 · Mar 18, 2011

Replies: 5

Views: 3K

Graduate Mass of electromagnetic waves

Mar 17, 2011 · Replies 10 · Mar 18, 2011

Replies: 10

Views: 4K

Graduate How to be an Inertial Observer?

Mar 13, 2011 · Replies 23 · Mar 17, 2011

Replies: 23

Views: 4K

Graduate Advanced/Retarded Eddington-Finkelstein Coordinates and Incident/Outgoing Wave

Mar 17, 2011 · Replies 2 · Mar 17, 2011

Replies: 2

Views: 6K

Graduate Constancy of speed of light and galiliean transformation

Mar 14, 2011 · Replies 7 · Mar 17, 2011

Replies: 7

Views: 2K

Graduate Can someone please explain to me why massless particles follow null geodesics?

Mar 15, 2011 · Replies 5 · Mar 17, 2011

Replies: 5

Views: 7K

Graduate What Determines the Speed of Gravitational Waves?

Mar 11, 2011 · Replies 31 · Mar 17, 2011

2

Replies: 31

Views: 7K

Graduate Is Absolute Rest Possible in a Universe Governed by Relativity?

Jun 13, 2010 · Replies 13 · Mar 17, 2011

Replies: 13

Views: 10K

Graduate Mermin's (Special) Relativity without Light

Mar 15, 2011 · Replies 4 · Mar 17, 2011

Replies: 4

Views: 5K

Graduate What is the Partial Derivative of Metric in Gravitational Action?

Mar 16, 2011 · Replies 2 · Mar 16, 2011

Replies: 2

Views: 2K

Graduate Physical implications of not-smooth metric derivative matching

Mar 15, 2011 · Replies 5 · Mar 16, 2011

Replies: 5

Views: 2K

Graduate Linear FE for static, spherical body

Mar 16, 2011 · Replies 5 · Mar 16, 2011

Replies: 5

Views: 2K

Graduate Which Equation for the Space-Time Interval Should You Use?

Mar 14, 2011 · Replies 8 · Mar 16, 2011

Replies: 8

Views: 3K

Graduate Mass, Rest Frames & Neutrinos: Explained

Mar 14, 2011 · Replies 5 · Mar 16, 2011

Replies: 5

Views: 3K

Graduate What is a Hamiltonian vector field in General Relativity?

Mar 12, 2011 · Replies 4 · Mar 16, 2011

Replies: 4

Views: 3K

Graduate Could Gravity's Force Fluctuate?

Mar 10, 2011 · Replies 7 · Mar 15, 2011

Replies: 7

Views: 3K

High School Gravitational pull (revolutions)

Mar 14, 2011 · Replies 4 · Mar 15, 2011

Replies: 4

Views: 3K

Undergrad Mass Dilation: Does 0.9c Travel Increase Mass?

Mar 14, 2011 · Replies 6 · Mar 15, 2011

Replies: 6

Views: 3K

Undergrad Gravity is Time? | General Relativity Explained

Mar 14, 2011 · Replies 3 · Mar 15, 2011

Replies: 3

Views: 3K

Graduate Schwartzschild exterior and interior solutions

Feb 21, 2011 · Replies 130 · Mar 14, 2011

5

Replies: 130

Views: 18K

Graduate Albert Einstein's theory of special relativity.

Jan 20, 2006 · Replies 10 · Mar 14, 2011

Replies: 10

Views: 5K

Graduate Time dilation and length contraction

Mar 14, 2011 · Replies 1 · Mar 14, 2011

Replies: 1

Views: 3K

Graduate Why is the gravitational field considered a tensor field in GR?

Mar 13, 2011 · Replies 9 · Mar 13, 2011

Replies: 9

Views: 2K

Undergrad Why do clocks appear to run at different speeds when traveling at high speeds?

Mar 13, 2011 · Replies 4 · Mar 13, 2011

Replies: 4

Views: 3K

Graduate B-E,F-D Statistics and the Lorentz Transformations

Mar 13, 2011 · Replies 7 · Mar 13, 2011

Replies: 7

Views: 2K

Graduate Is time dilation relative, or absolute?

Mar 13, 2011 · Replies 11 · Mar 13, 2011

Replies: 11

Views: 5K

Graduate LIGO and speed of gravitational waves

Jun 29, 2004 · Replies 8 · Mar 13, 2011

Replies: 8

Views: 3K

Graduate What is Newman Penrose Formalism?

Mar 11, 2011 · Replies 5 · Mar 13, 2011

Replies: 5

Views: 3K

Graduate Time Measurement in Moving Frames: Synchronization and Experimental Techniques

Mar 12, 2011 · Replies 8 · Mar 12, 2011

Replies: 8

Views: 3K

Graduate Does general relativity give curvature a magnitude?

Dec 20, 2010 · Replies 13 · Mar 12, 2011

Replies: 13

Views: 5K

Undergrad Difference between acceleration and gravitational field?

Mar 11, 2011 · Replies 6 · Mar 12, 2011

Replies: 6

Views: 3K

Graduate C represents the speed limit of the universe rather than the speed of light

Mar 6, 2011 · Replies 36 · Mar 12, 2011

2

Replies: 36

Views: 11K

Graduate Proving that the sphere cannot be expressed in flat coordinates

Mar 9, 2011 · Replies 11 · Mar 12, 2011

Replies: 11

Views: 3K

Graduate Is it really possible to solve for how fast an apple will fall on earth with GR

Mar 9, 2011 · Replies 13 · Mar 12, 2011

Replies: 13

Views: 3K

Graduate More detailed discussion on star collapse

Mar 10, 2011 · Replies 1 · Mar 11, 2011

Replies: 1

Views: 2K

Graduate Big trouble with Kerr solution

Mar 9, 2011 · Replies 7 · Mar 11, 2011

Replies: 7

Views: 3K

Graduate Gravitation and Information, BH paradox

Mar 8, 2011 · Replies 17 · Mar 11, 2011

Replies: 17

Views: 3K

Graduate Light Curve Space: Maintaining Speed Constant

Mar 10, 2011 · Replies 3 · Mar 11, 2011

Replies: 3

Views: 2K

Graduate Derivative of metric tesor and its trace

Mar 8, 2011 · Replies 2 · Mar 11, 2011

Replies: 2

Views: 4K

Graduate Does Energy in Curved Spacetime Depend on the Choice of Hypersurface?

Mar 7, 2011 · Replies 11 · Mar 11, 2011

Replies: 11

Views: 3K

Graduate Plotting Planets Orbits around Sun using Schwarzchild Metric

Mar 10, 2011 · Replies 3 · Mar 10, 2011

Replies: 3

Views: 2K

Undergrad Why is max speed, speed of light?

Mar 9, 2011 · Replies 3 · Mar 10, 2011

Replies: 3

Views: 4K

Graduate Mechanism of gravitational acceleration in GR

Mar 9, 2011 · Replies 10 · Mar 10, 2011

Replies: 10

Views: 3K

Graduate What is the physical meaning of metric compatibility and why is it important?

Mar 9, 2011 · Replies 10 · Mar 10, 2011

Replies: 10

Views: 5K

Graduate Coordinate transformations in gr

Mar 8, 2011 · Replies 7 · Mar 10, 2011

Replies: 7

Views: 3K

Graduate General covariance and tensors

Mar 2, 2011 · Replies 10 · Mar 10, 2011

Replies: 10

Views: 3K

Graduate Speed of light /time / and material

Mar 1, 2011 · Replies 4 · Mar 10, 2011

Replies: 4

Views: 3K

Graduate How much is space bended at the surface of the sun

Mar 9, 2011 · Replies 1 · Mar 9, 2011

Replies: 1

Views: 2K

Graduate General Relativity is pure Mathematics

Mar 7, 2011 · Replies 32 · Mar 9, 2011

2

Replies: 32

Views: 6K

Graduate Calculating Time Deviation Inside the Sun

Feb 13, 2011 · Replies 4 · Mar 9, 2011

Replies: 4

Views: 2K

Poll

Graduate Ultimate size of the Universe (finite)

Mar 5, 2011 · Replies 15 · Mar 9, 2011

Replies: 15

Views: 3K

A good video explaining time dilation

Mar 8, 2011 · Replies 3 · Mar 9, 2011

Replies: 3

Views: 2K

Graduate I think my Prof did this wrong, Need

Mar 8, 2011 · Replies 5 · Mar 8, 2011

Replies: 5

Views: 2K

Graduate Can a Naked Singularity Become a Black Hole?

Mar 4, 2011 · Replies 14 · Mar 8, 2011

Replies: 14

Views: 4K

Graduate Proving Surface Gravity with Killing's, Hypersurface, Geodesic Equation

Mar 4, 2011 · Replies 10 · Mar 8, 2011

Replies: 10

Views: 2K

Graduate Discrepancy regarding time measurement

Mar 8, 2011 · Replies 4 · Mar 8, 2011

Replies: 4

Views: 2K

Graduate Can Faster-Than-Light Communication Be Achieved with a Long Pole?

Mar 7, 2011 · Replies 4 · Mar 8, 2011

Replies: 4

Views: 4K

Graduate Easy Lorentz Transform Problem

Mar 4, 2011 · Replies 26 · Mar 7, 2011

Replies: 26

Views: 5K

Graduate Frame velocity v. object velocity in derivation of 4-velocity

Mar 5, 2011 · Replies 2 · Mar 6, 2011

Replies: 2

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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