Tuesday, June 27, 2006

Hidden Dimensions

Extra dimensions of space may be present in our universe. Their discovery would dramatically change our view of the cosmos and would prompt many questions.
How do they hide? What is their shape? How many are there? How big are they? Do particles and forces feel their presence?

Joanne Hewett
2006 slac lectures stanford.edu

In this Universe, we are still confronted with sometimes conflicting theories pulling in opposing directions, presenting different cosmoligical views or perceptions of the formation and origins or age of the Universe which surrounds us.

The Universe we live in
A constant and constantly evolving Universe.
We have some earth-shaking moments and events coming up at colliders or accelerators, which hope to demonstrate or reveal further evidence of the cosmological past of our universe, prove or disprove a big bang, and reveal the exciting possibility of extra dimensions in the space/time continuum.

An expanding universe, well hmmm... maybe we should use the term continuously evolving otherwise known in the trade as expanding Universe.

Supernova Acceleration Probes video animation SNAP
Supernova Acceleration Probes are to be sent to supernovae searching for evidence of an expanding universe which is flat and accelerating, ...
The discovery by the Supernova Cosmology Project (SCP) and the High-Z Supernova team that the expansion of the universe is accelerating poses an exciting mystery — for if the universe were governed by gravitational attraction, its rate of expansion would be slowing.
Acceleration requires a strange dark energy opposing this gravity. Is this Einstein’s cosmological constant, or more exotic new physics? Whatever the explanation, it will lead to new discoveries in astrophysics, particle physics, and gravitation.

Observations of exploding stars called Type Ia supernovae use them as markers of the expansion, of the growth of the universe as a function of time. Variations in the growth of distances reveal a picture of the cosmic environment, and so the pull of dark energy, in the way that the width of tree ring growth indicates the Earth's climatic environment over time. Combined with other astrophysical measurements, supernovae imply that more than two-thirds of our universe must be this dark energy.

well hmmm... perhaps the word constant for neither expanding or contracting, and not deccelerating would better describe what is meant by accelerating.

Blackholes and 'holes' in the spacetime fabric, are words which have already been used by others, words often with a different meaning. Can be so confusing or misleading.

Blackholes or Stars gone Supernova, where there is no longer a sizeable Sun and orbiting planets, possibly have a 'singularity' with the same gravitational pull as a Sun or Star, which one must skirt around so as not to be sucked into. This is what a blackhole could turn out to be, and which therefore is not a 'hole' but more likely an empty space in Space with a 'centre' which has the same gravitational pull as if a visible Sun or Star were still there.

Except it no longer is a Star or Sun, all that remains in that section/sector of space is possibly a 'singularity' with the mass and compressed density of the previous Sun or Star.
For intergalactic video animation visit: hubblesite blackholes

For update on the Shaw Prize for the accelerating universe
please visit: Saul Perlmutter, Adam Riess, Brian Schmidt ,
and Sean Carroll @ cosmicvariance
For more on extra dimensions and strings
please read
Warped Passages by Lisa Randall

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