Brian Greene: Is our universe the only universe?

Multiverse ?!

Brian Greene: 

Is our universe the only universe?

Multiverse bubbles

String theory visualisation

Vocabulary:

Spectrum - a range of values of a quantity or set of related quantities.

“Green backs up the claim with descriptions of a wide spectrum of astrophysical phenomena”

“The visible spectrum is the spectrum of light that we can perceive with our eyes”

Astrophysical - concerned with astrophysics / "astrophysical sciences" and astrophysics is the branch of astronomy that deals with the physics of stellar phenomena.

„Astrophysical sciences deal with physical and chemical processes that occur in stars and galaxies”

           

To postulate – to assume or to claim that something is true

“Scientists have to postulate many things to prove the existence of so called dark matter and dark energy”

Dimension – a measurement of the size of something in a particular direction, such as the length, width, height, or diameter

„We live in a worlds which is made out of 4 dimensions, namely lenght, width, height, and time”

To refute – to deny or to prove something to be wrong (by giving an argument)

Scientists usually refute theories which were postulated before the evidence”

Spontaneous - self-generated, involuntary, automatic / produced naturally without external influence

„The inflationary cosmology postulates that the amount of energy needed to create a universe equals exactly zero – this in turn means that universes pop up into existence spontaneously, and there is no need for any external agents.”

String – a cord usually made of fibre, - in context of my speech it appears in a term “String theory” which is:

 A mathematical theory for describing the properties of fundamental particles, which represents the particles as one-dimensional string-like objects, which exist in the normal four dimensions of space-time plus additional dimensions, the total dimensions being ten, eleven, or twenty-six depending on the version of the theory. The properties of fundamental particles in string theory and their manner of interaction with each other depend upon the modes of vibration of the strings. The attractiveness of this theory rests in part on its ability to provide a unified treatment of gravity as well as the three other basic forces of nature, in a manner consistent with quantum mechanics. The great difficulty of doing the calculations required by the theory, however, has thus far (1999) made it impossible to calculate the observable properties, such as the mass, of known particles, such as the electron, proton, mesons, quarks, and neutron; thus there is as yet no experimental verification for the theory. The most popular version of the theory depends on a mathematical property called supersymmetry, and the theory derived form this principle is properly called superstring theory, a term which is often used interchangeably with string theory