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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 Tensors versus differential forms

May 1, 2009 · Replies 23 · May 6, 2009

Replies: 23

Views: 14K

Graduate Potential Energy and energy conservation in General Relativity

May 4, 2009 · Replies 15 · May 6, 2009

Replies: 15

Views: 9K

Undergrad Gravity at a spot between the Earth and the Sun Summing to 0.

May 5, 2009 · Replies 8 · May 6, 2009

Replies: 8

Views: 10K

Graduate Question Regarding Electromagnetic Fields in Special Relativity

May 5, 2009 · Replies 2 · May 5, 2009

Replies: 2

Views: 2K

Graduate Is Time Truly a Uni-Dimensional Force?

Apr 28, 2009 · Replies 13 · May 5, 2009

Replies: 13

Views: 3K

Graduate Gravitational blueshift and a Moving Mass

May 3, 2009 · Replies 3 · May 5, 2009

Replies: 3

Views: 3K

Graduate Can general relativity derive from superstring theory?

May 4, 2009 · Replies 1 · May 5, 2009

Replies: 1

Views: 2K

Graduate Can Massless Objects Really Travel Faster Than Light?

Apr 29, 2009 · Replies 12 · May 5, 2009

Replies: 12

Views: 4K

Graduate Mass (both relativistic and rest) of a photon

May 4, 2009 · Replies 16 · May 4, 2009

Replies: 16

Views: 5K

Graduate Energy & momentum in non-Minkowski coordinates

May 4, 2009 · Replies 3 · May 4, 2009

Replies: 3

Views: 2K

Graduate Escape a Black Hole: Can It Be Done?

May 3, 2009 · Replies 5 · May 4, 2009

Replies: 5

Views: 4K

Undergrad GRB 13.1 Billion Light Years From Earth: Explained

May 1, 2009 · Replies 3 · May 4, 2009

Replies: 3

Views: 3K

Undergrad Two Black Holes Collide: The Result

Sep 23, 2005 · Replies 5 · May 4, 2009

Replies: 5

Views: 3K

Graduate Why Does the Epsilon Delta Rule Simplify Expressions in Vector Calculus?

May 4, 2009 · Replies 1 · May 4, 2009

Replies: 1

Views: 2K

Undergrad A copernicus/relativity question

May 1, 2009 · Replies 19 · May 3, 2009

Replies: 19

Views: 4K

Graduate What is the significance of covariance in general relativity?

May 1, 2009 · Replies 2 · May 2, 2009

Replies: 2

Views: 2K

Graduate Can gravitational time dilation be measured at different levels of the universe?

Apr 30, 2009 · Replies 3 · May 2, 2009

Replies: 3

Views: 2K

Graduate Understanding 3D Space Bending in General Relativity

Apr 30, 2009 · Replies 11 · May 2, 2009

Replies: 11

Views: 4K

Graduate Event Horizons / Time Dilation

Apr 30, 2009 · Replies 8 · May 2, 2009

Replies: 8

Views: 4K

Graduate Raising indices in curved space

May 1, 2009 · Replies 5 · May 1, 2009

Replies: 5

Views: 2K

Graduate Vanishing Ricci scalar always implies vacuum?

Feb 28, 2009 · Replies 8 · May 1, 2009

Replies: 8

Views: 11K

Graduate Simultaneity - Albert Einstein and the Theory of Relativity

Apr 2, 2009 · Replies 14 · May 1, 2009

Replies: 14

Views: 4K

Graduate Is the Speed of Light Truly Constant in General Relativity?

Apr 28, 2009 · Replies 30 · May 1, 2009

2

Replies: 30

Views: 5K

Graduate How does gravity tend to propagate?

Apr 30, 2009 · Replies 6 · May 1, 2009

Replies: 6

Views: 3K

Graduate Equivalence Principle & Gravitational Time Dilation

Apr 26, 2009 · Replies 20 · Apr 30, 2009

Replies: 20

Views: 6K

Graduate Deriving Multiplication Factor for Geometrized Units: Help Needed!

Apr 28, 2009 · Replies 4 · Apr 30, 2009

Replies: 4

Views: 7K

Graduate Christoffel symbols etc. via Lagrangian

Apr 30, 2009 · Replies 2 · Apr 30, 2009

Replies: 2

Views: 3K

Graduate Why is the speed of light restricted?

Apr 30, 2009 · Replies 1 · Apr 30, 2009

Replies: 1

Views: 2K

High School Is this an example of Relativity?

Apr 29, 2009 · Replies 3 · Apr 30, 2009

Replies: 3

Views: 2K

Graduate Relative motion of C on C formula

Apr 27, 2009 · Replies 7 · Apr 29, 2009

Replies: 7

Views: 2K

Graduate Physics Emergency: Two Trains Moving Away at 51% Light Speed

Apr 28, 2009 · Replies 3 · Apr 29, 2009

Replies: 3

Views: 2K

Graduate Photon energies relative to movement, and relativistic mass Q's.

Apr 27, 2009 · Replies 3 · Apr 29, 2009

Replies: 3

Views: 3K

High School Can't Believe It! Microsoft Word Refuses to Copy & Paste

Apr 25, 2009 · Replies 8 · Apr 28, 2009

Replies: 8

Views: 3K

Graduate Understanding Frames of Reference in Relativity

Apr 28, 2009 · Replies 10 · Apr 28, 2009

Replies: 10

Views: 4K

Graduate Does time dilation explain the constant measured speed of light?

Apr 21, 2009 · Replies 28 · Apr 28, 2009

Replies: 28

Views: 4K

Graduate Centrifugal force around planets

Apr 28, 2009 · Replies 1 · Apr 28, 2009

Replies: 1

Views: 2K

Graduate Earth's Velocity: Lorentz Factor & Reference Frame

Apr 26, 2009 · Replies 8 · Apr 27, 2009

Replies: 8

Views: 2K

Graduate Why would an infinite universe tend to contract?

Apr 24, 2009 · Replies 10 · Apr 27, 2009

Replies: 10

Views: 4K

Graduate Hypothetical spacecrafts traveling at light speed.

Apr 17, 2008 · Replies 8 · Apr 27, 2009

Replies: 8

Views: 4K

Graduate Is the Speed of Light Truly Constant for All Observers?

Apr 26, 2009 · Replies 7 · Apr 27, 2009

Replies: 7

Views: 2K

Graduate The interior space-time metric for a rotating spherical star

Feb 8, 2009 · Replies 4 · Apr 27, 2009

Replies: 4

Views: 4K

Undergrad Twin Paradox: Explaining the Relativity of Aging

Mar 24, 2009 · Replies 114 · Apr 26, 2009

4

Replies: 114

Views: 18K

Graduate Higgs Boson & Relativity: A Layman's Explanation

Apr 17, 2009 · Replies 5 · Apr 26, 2009

Replies: 5

Views: 4K

Undergrad How Does Speed Affect Aging and Time Perception?

Apr 26, 2009 · Replies 1 · Apr 26, 2009

Replies: 1

Views: 2K

Undergrad Speed of light and mass increase

Apr 26, 2009 · Replies 1 · Apr 26, 2009

Replies: 1

Views: 3K

Graduate So what if I was in motion and tried to measure my own mass?

Apr 25, 2009 · Replies 9 · Apr 25, 2009

Replies: 9

Views: 3K

Graduate Gravitational Time Dilation & Blueshift

Apr 21, 2009 · Replies 7 · Apr 25, 2009

Replies: 7

Views: 4K

Graduate Finding High Curvature Solution in GR to Einstein's Field Equations

Apr 23, 2009 · Replies 7 · Apr 25, 2009

Replies: 7

Views: 4K

Graduate Some questions,espacielly about time

Apr 23, 2009 · Replies 16 · Apr 25, 2009

Replies: 16

Views: 3K

Graduate Flat vs Curved Spacetime: Are They Truly Equivalent?

Apr 19, 2009 · Replies 10 · Apr 24, 2009

Replies: 10

Views: 5K

Undergrad Black Hole Thermodynamics Resources?

Apr 24, 2009 · Replies 2 · Apr 24, 2009

Replies: 2

Views: 2K

Undergrad Where does the energy come from in different frames of reference?

Apr 24, 2009 · Replies 8 · Apr 24, 2009

Replies: 8

Views: 2K

Graduate Large bodies of mass and their effects on apparent time

Apr 24, 2009 · Replies 2 · Apr 24, 2009

Replies: 2

Views: 2K

Graduate Difference between Invariance and Covariance

Apr 23, 2009 · Replies 5 · Apr 24, 2009

Replies: 5

Views: 33K

Graduate How is it that black holes are black?

Apr 24, 2009 · Replies 2 · Apr 24, 2009

Replies: 2

Views: 2K

Graduate Questioning dark matter and Reinventing Gravity

Jan 1, 2009 · Replies 15 · Apr 24, 2009

Replies: 15

Views: 4K

Graduate Why is the concept of proper acceleration important in General Relativity?

Mar 26, 2009 · Replies 25 · Apr 23, 2009

Replies: 25

Views: 5K

Undergrad Why Does Density Increase When an Object Moves By?

Apr 22, 2009 · Replies 5 · Apr 23, 2009

Replies: 5

Views: 2K

Graduate Evaporating BH and infalling observers - I am puzzed

Apr 15, 2009 · Replies 19 · Apr 23, 2009

Replies: 19

Views: 4K

Clocks & Boxcars: Get Solution to Problem

Apr 22, 2009 · Replies 12 · Apr 22, 2009

Replies: 12

Views: 2K

Graduate Refraction & Special Relativity: Can Photons Convert to Mass?

Apr 21, 2009 · Replies 1 · Apr 21, 2009

Replies: 1

Views: 2K

Graduate Understanding the Limitations of Faster-than-Light Travel in Physics

Apr 17, 2009 · Replies 7 · Apr 21, 2009

Replies: 7

Views: 4K

Graduate What Does the Gravitomagnetic B-Field Describe and What Are Its Units?

Apr 20, 2009 · Replies 2 · Apr 21, 2009

Replies: 2

Views: 2K

Graduate Can Objects Travel Faster Than the Speed of Light?

Apr 21, 2009 · Replies 2 · Apr 21, 2009

Replies: 2

Views: 2K

Graduate Gravitational lensing - 2 questions

Apr 19, 2009 · Replies 1 · Apr 21, 2009

Replies: 1

Views: 2K

Graduate Understanding Time Dilation in Einstein's Special Theory of Relativity

Mar 25, 2009 · Replies 297 · Apr 21, 2009

10

Replies: 297

Views: 33K

Graduate Simultaneous Paradox Explained - 65 Characters

Apr 20, 2009 · Replies 26 · Apr 20, 2009

Replies: 26

Views: 3K

Graduate Schwarzschild's radius inquiry

Apr 13, 2009 · Replies 5 · Apr 20, 2009

Replies: 5

Views: 3K

Graduate Speed of light, propellent incease in mass?

Apr 17, 2009 · Replies 16 · Apr 20, 2009

Replies: 16

Views: 3K

Graduate What is the Fabric of Spacetime Made Of?

Dec 4, 2008 · Replies 110 · Apr 19, 2009

4

Replies: 110

Views: 18K

Graduate Degrees of freedom in the curvature tensor

Apr 18, 2009 · Replies 1 · Apr 18, 2009

Replies: 1

Views: 4K

Graduate Math of relativistic space travel

Mar 26, 2009 · Replies 42 · Apr 18, 2009

2

Replies: 42

Views: 9K

Graduate What is the relationship between free falling bodies and spacetime geodesics?

Apr 13, 2009 · Replies 9 · Apr 17, 2009

Replies: 9

Views: 6K

Graduate Variation of Einstein-Hilbert action

Dec 10, 2008 · Replies 10 · Apr 17, 2009

Replies: 10

Views: 8K

Graduate Can physical 3D space exist at all?

Apr 15, 2009 · Replies 4 · Apr 17, 2009

Replies: 4

Views: 3K

Graduate After finding the Einstein Tensor

Apr 12, 2009 · Replies 3 · Apr 17, 2009

Replies: 3

Views: 2K

What would a time machine look like?

Apr 15, 2009 · Replies 29 · Apr 17, 2009

Replies: 29

Views: 18K

Graduate Does matter warp space time in the form of minimal surfaces?

Apr 15, 2009 · Replies 4 · Apr 17, 2009

Replies: 4

Views: 2K

Graduate Speed of light as an impossibility

Mar 5, 2009 · Replies 9 · Apr 16, 2009

Replies: 9

Views: 7K

Graduate Uncovering the Equivalence of Energy and Mass: Visualizing E=MC2

Mar 2, 2006 · Replies 27 · Apr 15, 2009

Replies: 27

Views: 11K

Graduate Is Gravity Truly a Force or Merely a Curvature of Space-Time?

Apr 13, 2009 · Replies 3 · Apr 14, 2009

Replies: 3

Views: 3K

Graduate Relativistic motion of a magnetic sail

Apr 13, 2009 · Replies 2 · Apr 14, 2009

Replies: 2

Views: 2K

Graduate Synchronising Clocks: Will They Stay in Sync?

Apr 14, 2009 · Replies 1 · Apr 14, 2009

Replies: 1

Views: 2K

Graduate Is there inertial mass-gravity equivalece principle with photons?

Apr 13, 2009 · Replies 1 · Apr 13, 2009

Replies: 1

Views: 2K

Graduate How Do Tidal Forces Affect Objects Near Black Holes?

Apr 12, 2009 · Replies 3 · Apr 13, 2009

Replies: 3

Views: 3K

Graduate Could GR generalized to non-integer dimension?

Apr 10, 2009 · Replies 8 · Apr 12, 2009

Replies: 8

Views: 3K

Graduate A question on velocity addition

Apr 10, 2009 · Replies 6 · Apr 12, 2009

Replies: 6

Views: 2K

Graduate Clarification on length contraction

Apr 12, 2009 · Replies 4 · Apr 12, 2009

Replies: 4

Views: 2K

Graduate Why Does Light Appear to Fall in a Gravitational Field?

Apr 3, 2009 · Replies 25 · Apr 12, 2009

Replies: 25

Views: 7K

Graduate Parametric Equation of a Sphere in General relativity

Apr 11, 2009 · Replies 1 · Apr 11, 2009

Replies: 1

Views: 4K

Graduate How Does Gravitational Time Dilation Affect Light Emitted from a Black Hole?

Apr 11, 2009 · Replies 4 · Apr 11, 2009

Replies: 4

Views: 3K

High School Why Time Can Be Negative: Understanding the Past & Present

Apr 7, 2009 · Replies 9 · Apr 10, 2009

Replies: 9

Views: 6K

Graduate Foliating Spacetime: Understanding the Curves and Metrics

Apr 10, 2009 · Replies 2 · Apr 10, 2009

Replies: 2

Views: 2K

Graduate Is Einstein's Train Thought Experiment an Example of Backward Causation?

Apr 9, 2009 · Replies 20 · Apr 10, 2009

Replies: 20

Views: 8K

Graduate Diffeomorphism Invariance in Einstein's Gravitation Theory Explained

Apr 7, 2009 · Replies 4 · Apr 10, 2009

Replies: 4

Views: 2K

Graduate What are Null Coordinates and Their Role in Spacetime?

Mar 27, 2009 · Replies 1 · Apr 10, 2009

Replies: 1

Views: 4K

Graduate The Alcubierre Drive and Negative Energy

Apr 9, 2009 · Replies 1 · Apr 10, 2009

Replies: 1

Views: 3K

Einsteins General Relativity Papers- Original

Mar 20, 2009 · Replies 3 · Apr 9, 2009

Replies: 3

Views: 16K

Graduate Does the CMB allow special rest frames to be defined?

Mar 30, 2009 · Replies 7 · Apr 9, 2009

Replies: 7

Views: 6K

Undergrad Question on gravitational time dilation

Apr 8, 2009 · Replies 2 · Apr 8, 2009

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.

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