"Big Bang or the Big Bounce?" --New Science Points to a Continuum
- URL to an interesting post in The daily Galaxy
Actually, I always thought of as the Big Burp after eating too much cold
pizza and kimchi.
First few paragraphs
"The big bang may not have been the beginning of the universe, but merely
the beginning of one of an infinite series of universes. Two fundamental
concepts in physics, both of which explain the nature of the Universe in many
ways, have been difficult to reconcile with each other. European
researchers have developed a mathematical approach to do so that has the potential to
explain what came before the Big Bang.
The big bang singularity --the single point from which the entire universe
is supposed to have sprung-- is the major sticking point in the big bang
theory; the calculations just can't account for such a singularity. Without
evidence associated with the earliest instant of the expansion, the _Big
Bang theory_ (http://en.wikipedia.org/wiki/Big_Bang) does not provide any
explanation for such an initial condition.
According to Einstein’s (classical) _theory of general relativity_
ity-at-cosmos-scales-.html) , space is a continuum. Regions of space can
be subdivided into smaller and smaller volumes without end.
The fundamental idea of quantum mechanics is that physical quantities exist
in discrete packets (quanta) rather than in a continuum. Further, these
quanta and the physical phenomena related to them exist on an extremely small
scale (_Planck scale_ (http://en.wikipedia.org/wiki/Planck_scale) ).
So far, the theories of quantum mechanics have failed to ‘quantise’
gravity. Loop quantum gravity (_LQG_
(http://en.wikipedia.org/wiki/Loop_quantum_gravity) ) is an attempt to do so. It represents space as a net of quantised
intersecting loops of excited gravitational fields called spin networks.
This network viewed over time is called spin foam.
Not only does LQG provide a precise mathematical picture of space and time,
it enables mathematical solutions to long-standing problems related to
black holes and the Big Bang. Amazingly, LQG predicts that the Big Bang was
actually a ‘_Big Bounce_ (http://en.wikipedia.org/wiki/Big_Bounce) ’, not a
singularity but a continuum, where the collapse of a previous universe
spawned the creation of ours.
European researchers initiated the ‘_Effective field theory_
(http://en.wikipedia.org/wiki/Effective_field_theory) for loop quantum gravity’
(EFTFORLQG) project to further develop this exciting candidate theory reconciling
classical and quantum descriptions of the Universe.
Scientists focused on the _background-independent_
(http://en.wikipedia.org/wiki/Background_independence) structure of LQG which requires that the
mathematics defining the system of spacetime be independent of any coordinate
system or reference frame (background)."
(I reject your reality and substitute my own)
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