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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 Why do photons naturally travel at c?

Gamish
Nov 26, 2004 · Replies 36 · Dec 16, 2004

2

Replies: 36

Graduate Mass of Photon: Consequences & Experiments - L.C. Tu et al (2004)

ZapperZ
Nov 23, 2004 · Replies 78 · Dec 16, 2004

3

Replies: 78

Graduate Is the universe's potential energy related to the mass inside a shell of matter?

Brane Dead
Dec 14, 2004 · Replies 6 · Dec 15, 2004

Replies: 6

Graduate Laws of physics in four-vector form. A question.

lslusa
Dec 14, 2004 · Replies 2 · Dec 14, 2004

Replies: 2

Graduate How objects look at high speeds

gaavslev
Dec 13, 2004 · Replies 2 · Dec 13, 2004

Replies: 2

Graduate Many Worlds Interpretation of SR

Bruninho
Dec 13, 2004 · Replies 4 · Dec 13, 2004

Replies: 4

Graduate Einstein´s work ion Unified Field Theory

mprm86
Dec 12, 2004 · Replies 4 · Dec 13, 2004

Replies: 4

Graduate Paradoxes that have come up for special relativity

Alkatran
Nov 8, 2004 · Replies 39 · Dec 13, 2004

2

Replies: 39

Graduate Technical paper on Lense-Thirring Lageos measurement

marcus
Dec 12, 2004 · Replies 4 · Dec 13, 2004

Replies: 4

Graduate What do the coordinates in the Schwarzschild metric actually mean?

speeding electron
Nov 29, 2004 · Replies 41 · Dec 11, 2004

2

Replies: 41

Graduate Does a single photon have 'color'

arrell
Dec 7, 2004 · Replies 13 · Dec 10, 2004

Replies: 13

Graduate Deriving the relativistic mass formula

dekoi
Dec 10, 2004 · Replies 6 · Dec 10, 2004

Replies: 6

Graduate Shining a Torch at the Moon: Does Light Travel Faster than c?

Bruninho
Dec 10, 2004 · Replies 6 · Dec 10, 2004

Replies: 6

Graduate Does a relativistic rotating mass bend light through its gravitational field?

Phymath
Dec 9, 2004 · Replies 4 · Dec 10, 2004

Replies: 4

Graduate Is Time Dilation Just a Virtual Effect in Relativity?

Bruninho
Dec 10, 2004 · Replies 2 · Dec 10, 2004

Replies: 2

Undergrad What is the direction of space curvature around a mass in 3D space?

Majid
Dec 8, 2004 · Replies 9 · Dec 9, 2004

Replies: 9

Undergrad 1st postulate of Special Relativity

Gamish
Dec 8, 2004 · Replies 4 · Dec 9, 2004

Replies: 4

Undergrad RTT’s mind boggling Time Dilation Paradox

RawThinkTank
Nov 28, 2004 · Replies 16 · Dec 9, 2004

Replies: 16

High School Special Relativity for the School Going Child

ZapperZ
Nov 30, 2004 · Replies 15 · Dec 9, 2004

Replies: 15

Undergrad Can the equation e=mc2 be derived?

chound
Dec 7, 2004 · Replies 3 · Dec 7, 2004

Replies: 3

Graduate Where to find solutions for relativity exercises

jvangael
Dec 5, 2004 · Replies 5 · Dec 6, 2004

Replies: 5

High School What Are Defined Quantities in Physics Like Momentum, Velocity, and Force?

pmb_phy
Dec 6, 2004 · Replies 10 · Dec 6, 2004

Replies: 10

Graduate Does light always travel at c relative to any observer or object?

devious_
Dec 5, 2004 · Replies 5 · Dec 6, 2004

Replies: 5

Undergrad What Are Parallel Universes and Their Connection to Time Travel?

hadeka
Nov 8, 2004 · Replies 24 · Dec 6, 2004

Replies: 24

Graduate What are the implications of GR that are not captured by gravitomagnetism?

ohwilleke
Dec 1, 2004 · Replies 10 · Dec 5, 2004

Replies: 10

Graduate Space curvature allows time travel to the past

Gamish
Nov 26, 2004 · Replies 4 · Dec 5, 2004

Replies: 4

Graduate Centrifugal force from GR perspective

Chi Meson
Nov 15, 2004 · Replies 32 · Dec 5, 2004

2

Replies: 32

Undergrad Why do we consider time as the 4th dimension?

TheDonk
Dec 3, 2004 · Replies 7 · Dec 4, 2004

Replies: 7

Graduate Arrow of time and why it flows in only one direction

wolram
Nov 19, 2004 · Replies 2 · Dec 3, 2004

Replies: 2

Graduate Why Can't Information Travel Faster Than Light Without Breaking Causality?

alpha_wolf
Dec 1, 2004 · Replies 3 · Dec 1, 2004

Replies: 3

Graduate Understanding Potential and Potential Energy in Relativistic Electrodynamics

pmb_phy
Nov 23, 2004 · Replies 5 · Dec 1, 2004

Replies: 5

Graduate Does black hole time dilation affect the age of the universe calculation?

DiracFeynman
Dec 1, 2004 · Replies 3 · Dec 1, 2004

Replies: 3

High School Do Black Holes Have Dimension?

mprm86
Nov 23, 2004 · Replies 2 · Nov 30, 2004

Replies: 2

Graduate Difference between special and general relativity

Demiwing
Nov 29, 2004 · Replies 5 · Nov 29, 2004

Replies: 5

High School Is the Speed of Light Affected by Atmospheric Conditions?

DB
Nov 27, 2004 · Replies 3 · Nov 28, 2004

Replies: 3

What are your favorite web pages on SR?

Photon A
Nov 27, 2004 · Replies 2 · Nov 27, 2004

Replies: 2

Graduate Black holes and Hawking radiation

JosephRombousky
Nov 15, 2004 · Replies 14 · Nov 26, 2004

Replies: 14

Graduate The whole racing with light thingy.

misogynisticfeminist
Nov 25, 2004 · Replies 2 · Nov 26, 2004

Replies: 2

Graduate Can Exceeding the Speed of Light Reverse Time?

Gamish
Nov 23, 2004 · Replies 2 · Nov 26, 2004

Replies: 2

Graduate Where Can I Find the Ricci Tensor/Scalar for a Circularly Symmetric Spacetime?

big bob
Nov 24, 2004 · Replies 2 · Nov 24, 2004

Replies: 2

Graduate Communication with a Million-Mile Pole: A Relativity Puzzle?

PBRMEASAP
Nov 24, 2004 · Replies 2 · Nov 24, 2004

Replies: 2

Undergrad Scalars and vectors in relativity: what does transform as coordinates mean?

heman
Nov 17, 2004 · Replies 2 · Nov 24, 2004

Replies: 2

Undergrad Special relativity and Universe expansion.

mprm86
Nov 23, 2004 · Replies 3 · Nov 24, 2004

Replies: 3

Graduate Clock Synchronization: How to Measure Photon Velocity

juju
Nov 19, 2004 · Replies 7 · Nov 23, 2004

Replies: 7

Graduate Terrestrial phenomena significantly influenced by GR?

Loren Booda
Nov 19, 2004 · Replies 5 · Nov 22, 2004

Replies: 5

Graduate What reference frame defines the age of the universe?

jzmckay
Nov 22, 2004 · Replies 2 · Nov 22, 2004

Replies: 2

Graduate Lorentz invariant norms of four-potential and four-current

speeding electron
Nov 22, 2004 · Replies 2 · Nov 22, 2004

Replies: 2

Undergrad What's wrong with my calculation?

scilover89
Nov 22, 2004 · Replies 3 · Nov 22, 2004

Replies: 3

Graduate Far Gravitational field of a moving mass

pervect
Nov 9, 2004 · Replies 13 · Nov 22, 2004

Replies: 13

Graduate Can photons accelerate along curved spacetime paths?

Loren Booda
Nov 21, 2004 · Replies 3 · Nov 21, 2004

Replies: 3

Graduate Understanding Interferometers: Principle, Methodology, and Applications

TheAntiRelative
Nov 18, 2004 · Replies 4 · Nov 19, 2004

Replies: 4

Graduate Minus sign placement in Christoffel symbol formula

pervect
Nov 18, 2004 · Replies 6 · Nov 19, 2004

Replies: 6

Graduate Relativity and Clocks on Airplanes Calibrated from the Ground

Les Sleeth
Nov 5, 2004 · Replies 8 · Nov 18, 2004

Replies: 8

Graduate Einstein energy and thermodynamic energy

Iraides Belandria
Oct 18, 2004 · Replies 16 · Nov 16, 2004

Replies: 16

Graduate The Minkowski so-called 'metric'

jcsd
Nov 12, 2004 · Replies 5 · Nov 16, 2004

Replies: 5

Graduate Outer product of two one forms.

ronblack2003
Nov 13, 2004 · Replies 3 · Nov 16, 2004

Replies: 3

Graduate What causes a single photon to propagate in an infinite spacetime?

Loren Booda
Nov 13, 2004 · Replies 2 · Nov 15, 2004

Replies: 2

Graduate Mahematics for general relativiy?

bhanukiran
Nov 8, 2004 · Replies 2 · Nov 15, 2004

Replies: 2

Graduate Can inertial forces result from the acceleration of space itself?

Shaw
Nov 13, 2004 · Replies 2 · Nov 15, 2004

Replies: 2

Graduate Can Gravity Be Cancelled? Theories and Research on the Effects of Gravity

oozie1
Jun 30, 2003 · Replies 11 · Nov 10, 2004

Replies: 11

Graduate Event horizon without singularity in homogeneous matter

hellfire
Nov 9, 2004 · Replies 2 · Nov 10, 2004

Replies: 2

Graduate Energy and physical effects of a 100,000-ton spaceship impacting a planet at 0.9c

pervect
Oct 24, 2004 · Replies 11 · Nov 10, 2004

Replies: 11

Undergrad Design features in a spacecraft

oheaveno
Nov 8, 2004 · Replies 7 · Nov 10, 2004

Replies: 7

Graduate .Solving the Time Travel Paradox: An Explanation

AVNguyen
Nov 3, 2004 · Replies 9 · Nov 9, 2004

Replies: 9

Graduate Why do static spacetimes admit timelike Killing vectors?

big bob
Nov 8, 2004 · Replies 12 · Nov 9, 2004

Replies: 12

Graduate What Is an Electric Field 4-Vector?

pmb_phy
Oct 28, 2004 · Replies 3 · Nov 8, 2004

Replies: 3

Graduate Did Einstein Think Reality Requires an Observer?

magus niche
Oct 27, 2004 · Replies 3 · Nov 8, 2004

Replies: 3

Graduate Does the Poincaré group preserve Minkowski scalar product?

kakarukeys
Nov 5, 2004 · Replies 20 · Nov 8, 2004

Replies: 20

Graduate Does length contraction apply to all objects, big and small?

kernelpenguin
Nov 5, 2004 · Replies 3 · Nov 6, 2004

Replies: 3

Graduate 'Speed of Light' Thought Experiment

Thomas2
Oct 26, 2004 · Replies 32 · Nov 5, 2004

2

Replies: 32

Graduate Contraction effects at relativistic velocities

asprin
Sep 22, 2004 · Replies 63 · Nov 4, 2004

3

Replies: 63

Graduate Spacetime Curvature: What Does it Mean?

Demiwing
Nov 3, 2004 · Replies 2 · Nov 4, 2004

Replies: 2

Undergrad Quest for Gravity Theory: Earth's Rotation Impact?

pitchharmonics
Nov 2, 2004 · Replies 5 · Nov 3, 2004

Replies: 5

Graduate Where does the 8.88 ft-lbs of extra energy come from in the space pellet scenario?

Slinkie
Oct 28, 2004 · Replies 36 · Nov 3, 2004

2

Replies: 36

Graduate Finding temperature when heat capacity reaches one third of classical value

stunner5000pt
Oct 26, 2004 · Replies 2 · Nov 2, 2004

Replies: 2

Graduate Space-time and the speed of light

Jayantiprasad
Oct 31, 2004 · Replies 11 · Nov 2, 2004

Replies: 11

Undergrad Understanding Lorentz Transformations: A Derivation for A-Level Students

Alan Tua
Oct 31, 2004 · Replies 3 · Nov 1, 2004

Replies: 3

Undergrad Experiments performed that upholds the predictions of SR?

bino
Oct 29, 2004 · Replies 2 · Oct 31, 2004

Replies: 2

Graduate Calculate Relative Speeds of Moving Objects for Twin Paradox

Alkatran
Oct 31, 2004 · Replies 3 · Oct 31, 2004

Replies: 3

Graduate Can u change time on a watch by

Slickchange1313
Oct 28, 2004 · Replies 8 · Oct 30, 2004

Replies: 8

Graduate Important find:when is the light wave-motion ?and when is particle-motion?

xszxsz
Oct 30, 2004 · Replies 5 · Oct 30, 2004

Replies: 5

Graduate Why Is the Fourth Component Necessary in Relativistic Momentum?

learningphysics
Oct 21, 2004 · Replies 25 · Oct 30, 2004

Replies: 25

Graduate Can you travel backward in time without paradoxes?

Slickchange1313
Oct 27, 2004 · Replies 12 · Oct 30, 2004

Replies: 12

Graduate Frame Dragging Detected per GR

DrChinese
Oct 20, 2004 · Replies 2 · Oct 29, 2004

Replies: 2

Undergrad What velocity is considered relativistic?

nelufar
Oct 26, 2004 · Replies 5 · Oct 28, 2004

Replies: 5

Undergrad Why is there 0 gravity in space

misogynisticfeminist
Sep 21, 2004 · Replies 24 · Oct 28, 2004

Replies: 24

Graduate Did Einstein call general relativity an aether theory?

jnorman
Sep 14, 2004 · Replies 16 · Oct 28, 2004

Replies: 16

Graduate Is the Speed of Light the Ultimate Conversion Point for Energy?

Einstiensqd
Apr 2, 2003 · Replies 4 · Oct 27, 2004

Replies: 4

Graduate Do two clocks stopped simultaneously in different frames show the same elapsed time?

Thomas2
Aug 2, 2004 · Replies 51 · Oct 27, 2004

2

Replies: 51

Graduate How Is Total Mass Calculated in General Relativity for a Finite Body?

blue_sky
Oct 7, 2004 · Replies 41 · Oct 26, 2004

2

Replies: 41

High School Gravitational control- where it doesnt exist

Slickchange1313
Oct 24, 2004 · Replies 4 · Oct 25, 2004

Replies: 4

Graduate Does an electric charge curve spacetime ?

Gonzolo
Sep 21, 2004 · Replies 119 · Oct 25, 2004

4

Replies: 119

Graduate Light, Mass, and Black hole question

Demiwing
Oct 16, 2004 · Replies 11 · Oct 25, 2004

Replies: 11

Graduate Information Twin , loss Paradox?

Wave's_Hand_Particle
Oct 24, 2004 · Replies 2 · Oct 25, 2004

Replies: 2

Graduate What are the implications of time being a fourth dimension?

ramcg1
Oct 17, 2004 · Replies 19 · Oct 24, 2004

Replies: 19

Graduate What is the Origin of Frame Dragging and Gravity Waves in GR?

Phymath
Oct 22, 2004 · Replies 4 · Oct 24, 2004

Replies: 4

Undergrad E=MC2 energy must contribute to the force of gravity

wolram
Oct 22, 2004 · Replies 1 · Oct 22, 2004

Replies: 1

Graduate Why does light pass a rocket at c despite relativistic time dilation?

Gecko
Oct 21, 2004 · Replies 8 · Oct 22, 2004

Replies: 8

Graduate Could someone me get my mind around this paradox

aceofspades
Oct 19, 2004 · Replies 3 · Oct 21, 2004

Replies: 3

Graduate Gravity and massless particles?

kennethrapp
Oct 16, 2004 · Replies 5 · Oct 21, 2004

Replies: 5

sidebar

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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