Monday, July 25, 2011
" ...THERE is always a BUT...! "
MONDAY'ITIS [ MONDAY i TEASE !]
t = Time needed for the expansion to the size of 45Billion Light Years from size "cero" of
what is observable, and of what is further away than our life time and this light does not reach us
to be able to see it ...! ACTUALLY A ASTRONOMY PROBLEM IS HOW LIGHT FROM SO FAR IS VISIBLE TODAY !
HOW CAN THE "OBSERVABLE UNIVERSE" BE 45MILLION light years big, and only be 14 Billion Years OLD ?
IT WOULD HAVE TO BE 45 Billion years old ! [As light Travels in one year 300000Km/s, and rounding off a little !]
AND ALL OF THE UNIVERSE 100 BILLION OR MORE YEARS OLD !
But always the but...! According to Astronomy matter can travel in space faster than light !
"While special relativity constrains objects in the universe from moving faster than the speed of light with respect to each other, there is no such theoretical constraint when space itself is expanding. It is thus possible for two very distant objects to be moving away from each other at a speed greater than the speed of light (meaning that one cannot be observed from the other). The size of the observable universe could thus be smaller than the entire universe.
It is also possible for a distance to exceed the speed of light times the age of the universe, which means that light from one part of space generated near the beginning of the Universe might still be arriving at distant locations (hence the cosmic microwave background radiation). These details are a frequent source of confusion among amateurs and even professional physicists.
Interpretations of the metric expansion of space are an ongoing subject of debate.
The Root of Conceptual Problems of the Cosmological Physics
© Yu. Baryshev1,2
1 Astronomical Institute of the St.-Petersburg State University, St.-Petersburg, Russia
2 Email: firstname.lastname@example.org
Abstract: The space expansion physics contains several paradoxes which were clearly demonstrated by Edward Harrison (1981, 1995, 2000), who emphasized that the cooling of homogeneous hot gas (including photon gas of CBR) in the standard cosmological model based on the violation of energy conservation by the expanding space. In modern version of SCM the term ``space expansion'' actually means continuous creation of vacuum, something that leads to conceptual problems. Recent discussion by Francis, Barnes, James, and Lewis (2007) on the physical sense of the increasing distance to a receding galaxy without motion of the galaxy is just a particular consequence of the arising paradoxes. Here we present an analysis of the following conceptual problems of the SCM: the violation of energy conservation for local comoving volumes, the exact Newtonian form of the Friedmann equation, the absence of an upper limit on the receding velocity of galaxies which can be greater than the speed of light, and the presence of the linear Hubble law deeply inside inhomogeneous galaxy distribution. The common cause of these paradoxes is the geometrical description of grav-ity, where there is no a well defined concept of the energy-momentum tensor for the gravitational field, no energy quanta – gravitons, and no energy-momentum conservation for matter plus gravity because gravity is not a material field.
What does space expansion mean physically?
Each comoving finite box in expanding universe continuously increases its volume, so gets more and more cubic centimeters. Physically expansion of the universe means the creation of space together with physical vacuum. Creation of space may be visualized by 2-d analogy with expanding sphere in 3-d space, where the surface of the sphere increases with time and for 2-d beings their universe grows with time (gets more square centimeters) .
Real Universe is not homogeneous, it contains atoms, planets, stars, galaxies. Bondi (1947) considered spherical inhomogeneities in the framework of GR and showed that inside them the space expands slowly. In fact bounded physical objects like particles, atoms, stars and galaxies do not expands.
So inside these objects there is no space creation. This is why the creation of space is a new cosmological phenome-non, which cannot be tested in laboratory because the Earth, the Solar System and the Galaxy do not expand.
Below we consider several puzzling properties of the expanding space, which are a direct consequence of the above derived exact equations.
...THERE IS ALWAYS A BUT !
...We live in the Solar System where Newton and Einstein Relativity reigns and no expansion defined as such occurs !
...No doubt Science attempts to study the Universe and Physics of what goes on beyond !
...In BOOK 2 we can use some special pure logic to make some theorizations, that could be quite close to "reality", "time", "space", "energy", and "matter" !
...BUT MEANWHILE THERE ARE A FEW PARADOX'S and UNKNOWN things, still unanswered by Astronomy and Science, that could be beyond our capability of determining the truths !
...AND THE BEST BUT, BUT, BUT...!:
THERE IS ALWAYS THE DEFINITION OF THE "unknowable", and not that it does not have a logic explanation, but that we could be limited in knowing !