The concept of location usually used with reference to a village or one city . A locality, in this framework, is a administrative division of a territory .
For example: "The national government announced the construction of a hospital in the town of San Marcos", “I grew up in a small town in the north of country , but in my adolescence I settled with my parents in the capital ”, “The Mexican artist will give a show in a Patagonian town before returning to his country”.
Localities may have a reduced amount of population or be very populated urban centers. There are even towns that, for various reasons, ended up losing their inhabitants and were left uninhabited.
A locality, in short, consists of land , buildings and various infrastructures (roads, sewage services, electricity network, etc.). Each has its own physiognomy and identity, beyond the geographical, cultural and social similarities that it shares with the others.
It is called locality, on the other hand, seat or square of an enclosure where public events take place . By extension, it is known as locality at ticket that provides the right to occupy one of these seats: “The locations for the concert sold out in a few hours”, “The stadium where the final of the tournament will be played has 55,000 seats”, "I think such an important rock band should perform in a theater with more locations, otherwise many people will be left out due to lack of space".
In the field of physical finally the principle of locality points out that two elements that are far enough apart from each other cannot exert a mutual influence instantaneously; therefore, in a short time period, each element can only be influenced by its immediate surroundings.
In other words, to satisfy the principle of locality, a physical interaction can only link two events in space-time so that each one of them is inside the double cone of light of the other. This means that this principle causes the cause or influence to spread to a speed that does not exceed that of light, although it can reach it.
In the previous paragraph certain concepts are mentioned that we must define briefly. It is understood by space-weather the mathematical model that fuses space and time into a single magnitude, so that they become inseparable. On the other hand we talk about light cone , a model that serves to describe the evolution of a beam of light over time.
Below we review some of the ideas that the acclaimed physicist Albert Einstein used to describe the principle of locality. In the first place he spoke of the relative independence of two objects that are at a great distance, since an external influence that affects one of them cannot do so directly on the other, which is known as the beginning of action local.
He also said that we should not limit the understanding of this principle to action to distance as for the electromagnetic force or gravity, but also that no external influence could affect the object that is remote.
In the field of classic mechanics , it is said that the stars are affected by the position of their planets, regardless of whether they are at abysmal distances. In other words, this law proposed by Isaac Newton (the "law of gravitation universal ") spoke of a remote action that, according to Einstein, would be impossible.
Precisely for the relativistic mechanics , some scientists among whom was Einstein intended to exclude the possibility of any kind of remote action.