The holographic principle is a property of quantum gravity and string theories which states that the description of a volume of space can be thought of as encoded on a boundary to the region—preferably a light-like boundary like a gravitational horizon . First proposed by Gerard 't Hooft , it was given a precise string-theory interpretation by Leonard Susskind [ 1 ] who combined his ideas with previous ones of 't Hooft and Charles Thorn . [ 1 ] [ 2 ] As pointed out by Raphael Bousso , [ 3 ] Thorn observed in 1978 that string theory admits a lower dimensional description in which gravity emerges from it in what would now be called a holographic way. In a larger and more speculative sense, the theory suggests that the entire universe can be seen as a two-dimensional information structure "painted" on the cosmological horizon , such that the three dimensions we observe are only an effective description at macroscopic scales and at low energies .
FOREWORD This open document is a proposal to begin serious international consultation on the question of future attempts deliberately to transmit electromagnetic signals from Earth to extraterrestrial civilizations.
A black hole is a region of spacetime from which gravity prevents anything, including light , from escaping. [ 1 ] The theory of general relativity predicts that a sufficiently compact mass will deform spacetime to form a black hole. Around a black hole there is a mathematically defined surface called an event horizon that marks the point of no return. It is called "black" because it absorbs all the light that hits the horizon, reflecting nothing, just like a perfect black body in thermodynamics . [ 2 ] [ 3 ] Quantum field theory in curved spacetime predicts that event horizons emit radiation like a black body with a finite temperature .
One of the most well-known examples of an event horizon derives from general relativity's description of a black hole , a celestial object so massive that no nearby matter or radiation can escape its gravitational field .
HUMAN EARTH DESTRUCTS