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THE BOUNDARY AT INFINITY. “Thus, the full majesty of superstring theory in an antide Sitter universe is painted on the boundary of the universe.” https://lnkd.in/draqjTW View in LinkedIn

REVISED VIEW OF SPACETIME. “Using antide Sitter spacetime, theorists have devised a concrete example of the holographic principle at work: a universe described by superstring theory functioning in an antide Sitter spacetime is completely equivalent to a quantum field theory operating on the boundary of that spacetime.” https://lnkd.in/draqjTW View in LinkedIn

SWITCHEROO. “Now, if the repulsive cosmological constant is replaced by an attractive one, de Sitter's solution turns into antide Sitter spacetime, which has equally as much symmetry. More important for the holographic concept, it possesses a boundary, which is located at infinity and is a lot like our everyday spacetime.” https://lnkd.in/draqjTW View in LinkedIn

A CHANGING UNIVERSE. “De Sitter spacetime is empty, expands at an accelerating rate and is very highly symmetrical. In 1997 astronomers studying distant supernova explosions concluded that our universe now expands in an accelerated fashion and will probably become increasingly like a de Sitter spacetime in the future.” https://lnkd.in/draqjTW View in LinkedIn

DE SITTER SPACETIME. “A class of concrete examples of the holographic principle at work involves so-called antide Sitter spacetimes. The original de Sitter spacetime is a model universe first obtained by Dutch astronomer Willem de Sitter in 1917 as a solution of Einstein's equations, including the repulsive force known as the cosmological constant.” https://lnkd.in/draqjTW View in LinkedIn

Fern frond undersides with early summer spore pods already ripe. View in LinkedIn

DEATH IS PRUNING. “Taking the characteristic lifetime of a bacterium as 10(3) seconds, in a million years (3 × 10(13) seconds), the total number of living organisms would be approximately 10(42) -10(43), and for a billion years, this number would be 10(45) - 10(46).” https://lnkd.in/da7dRTF View in LinkedIn

CONSENSUS DOUBTS. “Does such a universe conform to the holographic principle or the holographic bound? Susskind's argument based on collapse to a black hole is of no help here. Indeed, the holographic bound deduced from black holes must break down in a uniform expanding universe.” https://lnkd.in/draqjTW View in LinkedIn

MODERN CONSENSUS. “Most cosmologists today concur that our universe resembles an FRW universe, one that is infinite, has no boundary and will go on expanding ad infinitum.” (FRW = Friedmann-Robertson-Walker universe). https://lnkd.in/draqjTW View in LinkedIn

“HIGHLY SYMMETRIC and empty, the 5-D antide Sitter universe is hardly like our universe existing in 4-D, filled with matter and radiation and riddled with violent events. Even if we approximate our real universe with one that has matter and radiation spread uniformly throughout, we get not an antide Sitter universe but rather a Friedmann-Robertson-Walker universe.” https://lnkd.in/draqjTW View in LinkedIn