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- Light_cone abstract "A light cone is the path that a flash of light, emanating from a single event (localized to a single point in space and a single moment in time) and traveling in all directions, would take through spacetime. If we imagine the light confined to a two-dimensional plane, the light from the flash spreads out in a circle after the event E occurs, and if we graph the growing circle with the vertical axis of the graph representing time, the result is a cone, known as the future light cone. The past light cone behaves like the future light cone in reverse, a circle which contracts in radius at the speed of light until it converges to a point at the exact position and time of the event E. In reality, there are three space dimensions, so the light would actually form an expanding or contracting sphere in 3D space rather than a circle in 2D, and the light cone would actually be a four-dimensional version of a cone whose cross-sections form 3D spheres (analogous to a normal three-dimensional cone whose cross-sections form 2D circles), but the concept is easier to visualize with the number of spatial dimensions reduced from three to two.Because signals and other causal influences cannot travel faster than light (see special relativity and quantum entanglement), the light cone plays an essential role in defining the concept of causality: for a given event E, the set of events that lie on or inside the past light cone of E would also be the set of all events that could send a signal that would have time to reach E and influence it in some way. For example, at a time ten years before E, if we consider the set of all events in the past light cone of E which occur at that time, the result would be a sphere (2D: disk) with a radius of ten light-years centered on the future position E will occur. So, any point on or inside the sphere could send a signal moving at the speed of light or slower that would have time to influence the event E, while points outside the sphere at that moment would not be able to have any causal influence on E. Likewise, the set of events that lie on or inside the future light cone of E would also be the set of events that could receive a signal sent out from the position and time of E, so the future light cone contains all the events that could potentially be causally influenced by E. Events which lie neither in the past or future light cone of E cannot influence or be influenced by E in relativity.".
- Light_cone thumbnail World_line.svg?width=300.
- Light_cone wikiPageExternalLink paradox.html.
- Light_cone wikiPageExternalLink lightcone.
- Light_cone wikiPageExternalLink minkowski.html.
- Light_cone wikiPageID "310474".
- Light_cone wikiPageRevisionID "606415666".
- Light_cone hasPhotoCollection Light_cone.
- Light_cone subject Category:Astrophysics.
- Light_cone subject Category:Light.
- Light_cone subject Category:Lorentzian_manifolds.
- Light_cone subject Category:Theory_of_relativity.
- Light_cone type Artifact100021939.
- Light_cone type Conduit103089014.
- Light_cone type LorentzianManifolds.
- Light_cone type Manifold103717750.
- Light_cone type Object100002684.
- Light_cone type Passage103895293.
- Light_cone type PhysicalEntity100001930.
- Light_cone type Pipe103944672.
- Light_cone type Tube104493505.
- Light_cone type Way104564698.
- Light_cone type Whole100003553.
- Light_cone type YagoGeoEntity.
- Light_cone type YagoPermanentlyLocatedEntity.
- Light_cone comment "A light cone is the path that a flash of light, emanating from a single event (localized to a single point in space and a single moment in time) and traveling in all directions, would take through spacetime. If we imagine the light confined to a two-dimensional plane, the light from the flash spreads out in a circle after the event E occurs, and if we graph the growing circle with the vertical axis of the graph representing time, the result is a cone, known as the future light cone.".
- Light_cone label "Cone de luz".
- Light_cone label "Cono de luz".
- Light_cone label "Cône de lumière".
- Light_cone label "Lichtkegel".
- Light_cone label "Lichtkegel".
- Light_cone label "Light cone".
- Light_cone label "Stożek czasoprzestrzenny".
- Light_cone label "Световой конус".
- Light_cone label "مخروط ضوئي".
- Light_cone label "光円錐".
- Light_cone label "光锥".
- Light_cone sameAs Lichtkegel.
- Light_cone sameAs Cono_de_luz.
- Light_cone sameAs Cône_de_lumière.
- Light_cone sameAs 光円錐.
- Light_cone sameAs Lichtkegel.
- Light_cone sameAs Stożek_czasoprzestrzenny.
- Light_cone sameAs Cone_de_luz.
- Light_cone sameAs m.01t3gg.
- Light_cone sameAs Q1137903.
- Light_cone sameAs Q1137903.
- Light_cone sameAs Light_cone.
- Light_cone wasDerivedFrom Light_cone?oldid=606415666.
- Light_cone depiction World_line.svg.
- Light_cone isPrimaryTopicOf Light_cone.
