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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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I What happens to the inertia of a mass falling into a black hole?

Apr 21, 2019 · Replies 40 · Apr 25, 2019

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Replies: 40

Views: 4K

Lie derivative and Riemann tensor

Apr 12, 2008 · Replies 1 · Apr 25, 2019

Replies: 1

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Killing vectors in space with torsion?

Jan 15, 2010 · Replies 1 · Apr 25, 2019

Replies: 1

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I Gravity and balls on rubber sheets

Apr 17, 2019 · Replies 10 · Apr 25, 2019

Replies: 10

Views: 3K

A How Does the 3D Metric Relate to Volume in a Closed Universe?

Apr 4, 2019 · Replies 3 · Apr 24, 2019

Replies: 3

Views: 3K

Kepler & Einstein: Agree or Disagree?

Aug 11, 2008 · Replies 1 · Apr 24, 2019

Replies: 1

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Redshift and blueshift in expanding universe

Mar 5, 2012 · Replies 2 · Apr 23, 2019

Replies: 2

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Why there can be only one invariant speed

Jul 4, 2009 · Replies 5 · Apr 23, 2019

Replies: 5

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Asymmetry in black hole formation, and a possible hand-wavy no-hair theorem

Oct 18, 2010 · Replies 1 · Apr 23, 2019

Replies: 1

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Video camera links in Special Relativity

Nov 21, 2009 · Replies 1 · Apr 23, 2019

Replies: 1

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B Einstein's Train Thought Experiment

Apr 22, 2019 · Replies 16 · Apr 22, 2019

Replies: 16

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Can red shift compare which clock go faster?

Dec 27, 2005 · Replies 2 · Apr 22, 2019

Replies: 2

Views: 2K

Flat time slices in Gullstrand–Painlevé coordinates?

Aug 12, 2010 · Replies 1 · Apr 22, 2019

Replies: 1

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Energy-Momentum Tensor for a particle

Sep 26, 2012 · Replies 1 · Apr 22, 2019

Replies: 1

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Falling into a charged black hole

Nov 24, 2009 · Replies 1 · Apr 22, 2019

Replies: 1

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Does expanding space affect time dilation etc?

Sep 10, 2011 · Replies 2 · Apr 22, 2019

Replies: 2

Views: 2K

How do the energy conditions in GR relate to timelike and null vectors?

Jan 11, 2011 · Replies 1 · Apr 22, 2019

Replies: 1

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I Centre of Mass-Energy: Griffiths Electrodynamics 4th Ed.

Apr 20, 2019 · Replies 5 · Apr 22, 2019

Replies: 5

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B Time Dilation Dialogue: Understanding the Concept

Apr 22, 2019 · Replies 17 · Apr 22, 2019

Replies: 17

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Where does a radially falling test particle cross the inner horizon of RN BH?

Mar 10, 2011 · Replies 1 · Apr 22, 2019

Replies: 1

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Clocks Falling into Gravity Wells: Variation Observed?

Sep 13, 2010 · Replies 1 · Apr 22, 2019

Replies: 1

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Understand Logic of Wald & Zoupas' Expression on Conserved Quantities

Jan 17, 2019 · Replies 1 · Apr 22, 2019

Replies: 1

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The Physics of De Sitter Black Hole Heat Capacity

Mar 27, 2019 · Replies 2 · Apr 22, 2019

Replies: 2

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I Help Understanding Metric Tensor

Apr 20, 2019 · Replies 12 · Apr 21, 2019

Replies: 12

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I Schwarzschild Geodesics: An Overview

Apr 20, 2019 · Replies 7 · Apr 20, 2019

Replies: 7

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A Orbit velocity in Schwarzschild metric?

Jan 9, 2019 · Replies 13 · Apr 20, 2019

Replies: 13

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B Special Relativity Calc: Half Speed of Light - Jose

Apr 20, 2019 · Replies 1 · Apr 20, 2019

Replies: 1

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I Inside the Schwarzschild horizon

Apr 19, 2019 · Replies 5 · Apr 20, 2019

Replies: 5

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I Gravitational Waves: Prerequisites for Study

Apr 19, 2019 · Replies 1 · Apr 19, 2019

Replies: 1

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I Accelerating into a black hole?

Apr 18, 2019 · Replies 7 · Apr 19, 2019

Replies: 7

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Venus during the day, a test of relativity?

Dec 21, 2005 · Replies 8 · Apr 18, 2019

Replies: 8

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A Does Komar Mass Include the Energy of Gravitational Field?

Apr 12, 2019 · Replies 38 · Apr 18, 2019

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Replies: 38

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B Black Hole Evaporation: What's Left?

Apr 17, 2019 · Replies 1 · Apr 17, 2019

Replies: 1

Views: 998

I Deriving E&B Fields from Plane Wave 4-Potential

Apr 16, 2019 · Replies 5 · Apr 17, 2019

Replies: 5

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Uniformity of universe expansion

Oct 2, 2009 · Replies 3 · Apr 17, 2019

Replies: 3

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I Compute Physical Coordinates of an Event in a Curved Spacetime

Apr 16, 2019 · Replies 1 · Apr 16, 2019

Replies: 1

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Could a Fixed Point on a Strong Fishing Line Influence Space-Time?

Feb 12, 2007 · Replies 1 · Apr 16, 2019

Replies: 1

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Can Wormholes Accurately Determine Points in Space and Time?

Dec 24, 2007 · Replies 1 · Apr 16, 2019

Replies: 1

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I Vaidya Metrics: Outgoing M(u) Conditions & Phys. Situations

Apr 15, 2019 · Replies 3 · Apr 16, 2019

Replies: 3

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Einstein-Strauss solution with one or two bubbles

Jun 5, 2007 · Replies 1 · Apr 15, 2019

Replies: 1

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Effect of gravitational potential on energy

Mar 22, 2008 · Replies 1 · Apr 15, 2019

Replies: 1

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Frequency shift and relative velocity

Oct 28, 2008 · Replies 2 · Apr 15, 2019

Replies: 2

Views: 4K

A What does the image of the black hole say about general relativity?

Apr 15, 2019 · Replies 1 · Apr 15, 2019

Replies: 1

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Causality & Hyperspace: FTL Communication Paradoxes

Dec 10, 2004 · Replies 1 · Apr 14, 2019

Replies: 1

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B What does the constancy of speed of light mean?

Apr 12, 2019 · Replies 32 · Apr 14, 2019

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Replies: 32

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Is Empty Spacetime Observable or Merely Theoretical?

Jun 14, 2005 · Replies 1 · Apr 14, 2019

Replies: 1

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Bigbang Bigcrunch Singular event?

Dec 28, 2009 · Replies 1 · Apr 14, 2019

Replies: 1

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Local coordinates, physical coordinates

Sep 5, 2007 · Replies 1 · Apr 14, 2019

Replies: 1

Views: 4K

Mach's principle and variable speed of light.

Nov 14, 2005 · Replies 1 · Apr 14, 2019

Replies: 1

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Length contraction and wave length transformation

Nov 30, 2006 · Replies 1 · Apr 14, 2019

Replies: 1

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I Does this contradict or require GR?

Apr 12, 2019 · Replies 15 · Apr 13, 2019

Replies: 15

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About the validity of Einstein’s 1905 Principle of Relativity

Nov 8, 2007 · Replies 1 · Apr 13, 2019

Replies: 1

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Help with Relativistic Collision

Aug 17, 2011 · Replies 1 · Apr 13, 2019

Replies: 1

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E on q independent of v - confusing?

Nov 23, 2010 · Replies 1 · Apr 13, 2019

Replies: 1

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Quantum gravitational uncertainty

Jul 13, 2006 · Replies 1 · Apr 13, 2019

Replies: 1

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Gamma Ray Bursts and Gravitational Radiation

Oct 28, 2008 · Replies 1 · Apr 13, 2019

Replies: 1

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Redshift/Blueshift of Gravity Waves Around a Black Hole

Jan 21, 2010 · Replies 1 · Apr 13, 2019

Replies: 1

Views: 3K

Wormhole Travel: 10 LY Away in an Instant?

May 21, 2010 · Replies 1 · Apr 13, 2019

Replies: 1

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Investigating Belinfante Tensor: Relation to Conserved Current

Apr 7, 2019 · Replies 1 · Apr 13, 2019

Replies: 1

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Is Spacetime the Cause of Inertia?

Nov 9, 2009 · Replies 1 · Apr 13, 2019

Replies: 1

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On when does Hawking radiation begin?

Nov 19, 2010 · Replies 1 · Apr 13, 2019

Replies: 1

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Is the perception of backwards time possible in relativity during deceleration?

May 14, 2007 · Replies 1 · Apr 13, 2019

Replies: 1

Views: 2K

Easy ways to explain special & general relativity

May 6, 2010 · Replies 1 · Apr 13, 2019

Replies: 1

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Discrete Relativity: Measuring Planck Units

Nov 8, 2004 · Replies 1 · Apr 13, 2019

Replies: 1

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What Does Distinguished Really Mean in Technical and Legal Contexts?

Jan 10, 2010 · Replies 1 · Apr 13, 2019

Replies: 1

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How does a large mass warp space?

Nov 30, 2008 · Replies 1 · Apr 13, 2019

Replies: 1

Views: 3K

Time Travel Question (from A Briefer History of Time )

Feb 26, 2010 · Replies 1 · Apr 13, 2019

Replies: 1

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Relativistic mass affect weight of an object?

Sep 16, 2010 · Replies 1 · Apr 13, 2019

Replies: 1

Views: 3K

Sticky for beginners to draw a spacetime diagram

Oct 9, 2008 · Replies 1 · Apr 13, 2019

Replies: 1

Views: 5K

Can Unknown Physics Explain the Singularity of a Black Hole?

Aug 18, 2004 · Replies 1 · Apr 13, 2019

Replies: 1

Views: 4K

Rest Frame of a Photon - FAQ by Forum Members

Jan 26, 2011 · Replies 1 · Apr 13, 2019

Replies: 1

Views: 19K

B Did Einstein Disagree With Black Holes?

Apr 10, 2019 · Replies 6 · Apr 13, 2019

Replies: 6

Views: 2K

What Is the Best Way to Teach Special Relativity?

Jan 9, 2008 · Replies 1 · Apr 13, 2019

Replies: 1

Views: 2K

I Falling Into a Black Hole: Time Dilation & Hawking Radiation

Apr 11, 2019 · Replies 9 · Apr 13, 2019

Replies: 9

Views: 3K

Resolving the Black Hole Paradox: A Perspective from Different Reference Frames

Aug 15, 2004 · Replies 1 · Apr 13, 2019

Replies: 1

Views: 3K

Debunking "c-decay": History & Facts

Oct 18, 2003 · Replies 1 · Apr 12, 2019

Replies: 1

Views: 4K

Gravitational waves, electromagntic waves and charged particles

Apr 16, 2012 · Replies 1 · Apr 12, 2019

Replies: 1

Views: 2K

A Throwing Balls on a Large Planet: GR Approximation Problem

Apr 8, 2019 · Replies 8 · Apr 12, 2019

Replies: 8

Views: 2K

I Photon Patterns in Space: Could They Exist?

Apr 10, 2019 · Replies 11 · Apr 11, 2019

Replies: 11

Views: 2K

I Particles w/ 0 Inertial Mass Traveling Faster than Light?

Apr 10, 2019 · Replies 9 · Apr 10, 2019

Replies: 9

Views: 1K

I Looking for more accurate energy-momentum transformations for photons

Mar 31, 2019 · Replies 35 · Apr 10, 2019

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Replies: 35

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B Do we understand what the Universe looks like for a photon?

Apr 7, 2019 · Replies 20 · Apr 9, 2019

Replies: 20

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I Reading suggestions about the "nature of time"

Apr 6, 2019 · Replies 27 · Apr 8, 2019

Replies: 27

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I Transverse inertial motion of rockets in acceleration

Apr 6, 2019 · Replies 18 · Apr 8, 2019

Replies: 18

Views: 2K

A Describing a Rotating Vector with Changing Angular-Velocity

Apr 7, 2019 · Replies 4 · Apr 7, 2019

Replies: 4

Views: 2K

B Is the Twin Paradox Really a Paradox?

Mar 9, 2019 · Replies 61 · Apr 7, 2019

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Replies: 61

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I Gravitational Waves: Questions on Mass & Escape Velocity

Apr 6, 2019 · Replies 5 · Apr 6, 2019

Replies: 5

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I Time Dilation Effects - Understand without Clocks

Apr 5, 2019 · Replies 6 · Apr 6, 2019

Replies: 6

Views: 1K

I Uniqueness Theorems in Non-Flat Spacetime

Apr 4, 2019 · Replies 3 · Apr 5, 2019

Replies: 3

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NASA Mission to Alpha Centauri: SR & Relativistic Effects

Apr 5, 2019 · Replies 3 · Apr 5, 2019

Replies: 3

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A Deriving Relativistic Boltzmann Equation | Theory Physics MSc Thesis

Apr 1, 2019 · Replies 3 · Apr 5, 2019

Replies: 3

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Mass of Hadrons: Verifying Special Relativity

Apr 3, 2019 · Replies 8 · Apr 4, 2019

Replies: 8

Views: 1K

I Is the Delta Function a Scalar?

Apr 3, 2019 · Replies 1 · Apr 3, 2019

Replies: 1

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I Fastest Cause & Effect: Electric Field & Magnetic Field

Mar 27, 2019 · Replies 7 · Apr 3, 2019

Replies: 7

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I Conserved Stress-Energy in Gravitational Theories

Apr 1, 2019 · Replies 6 · Apr 2, 2019

Replies: 6

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I Determining c from Maxwell's Equations

Nov 22, 2016 · Replies 31 · Apr 1, 2019

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Replies: 31

Views: 9K

B Magnetic field and moving charge special relativity

Mar 29, 2019 · Replies 7 · Mar 31, 2019

Replies: 7

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I Invariance of Action: Lagrangian Transformation

Mar 28, 2019 · Replies 3 · Mar 30, 2019

Replies: 3

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A Equations for computing null geodesics in Schwarzschild spacetime

Mar 30, 2019 · Replies 8 · Mar 30, 2019

Replies: 8

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B Coulomb force over Rindler horizon

Mar 13, 2019 · Replies 31 · Mar 29, 2019

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Replies: 31

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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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