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A Closed, Expanding Universe In String Theory - ScienceDirect
We present a conformal field theory - obtained from a gauged WZW model - that describes a closed, inhomogeneous expanding and recollapsing universe in… Oct 29, 1992 ... We present a conformal field theory - obtained from a gauged WZW model - that describes a closed, inhomogeneous expanding and recollapsing ... [ReadMore..]
Astronomy Professor Discusses Mystery Of Increasingly Expanding ...
Paul Martini, an astronomy professor at Ohio State University, discussed the mystery of cosmic acceleration at a Radcliffe Fellows event Wednesday. Nov 5, 2020 ... With the constant presence of dark energy, the more the universe expands ... Martini called this theory the “most prevalent explanation” and ... [ReadMore..]
Where Is The Centre Of The Universe?
According to the standard theories of cosmology, the universe started with a "Big Bang" about 14 thousand million years ago and has been expanding ever ... [ReadMore..]
Evidence-for-the-Big-Bang.pdf
What is the Big Bang theory? When scientists talk about the expanding Universe, they mean that it has been increasing in size ever since the Big Bang. [ReadMore..]
Is There A Reasonable Alternative To The Theory Of The Expanding ...
Read 4881 answers by scientists to the question asked by Oscar Chavoya-Aceves on Sep 13, 2013 The other type of redshift is the cosmological redshift, which you observe as a result of the expansion of the universe. This type of redshift can be observed ... [ReadMore..]
Astronomy - Galaxies And The Expanding Universe | Britannica
Einstein almost immediately applied his gravity theory to the universe as a whole, publishing his first cosmological paper in 1917. Because he was not well acquainted with recent work in astronomy, he assumed that the universe was static and unchanging. Einstein assumed that matter was distributed uniformly throughout the universe, but he could not find a static solution to his field equations. The problem was that the mutual gravitation of all the matter in the universe would tend to make the universe contract. Therefore, Einstein introduced an additional term containing a factor Λ, the “cosmological constant.” The new term provided Einstein almost immediately applied his gravity theory to the universe as a whole, publishing his first cosmological paper in 1917. [ReadMore..]
The Expanding Universe
In 1929, Edwin Hubble, an astronomer at Caltech, made a critical discovery that soon led to scientific answers for these questions: he discovered that the ... [ReadMore..]
A Closed, Expanding Universe In String Theory
We present a conformal field theory -- obtained from a gauged WZW model -- that describes a closed, inhomogeneous expanding and recollapsing universe in $3+1$ dimensions. A possible violation of cosmic censorship is avoided because the universe recollapses just when a naked singularity was about to form. The model has been chosen to have $c=4$ (or $\widehat c=4$ in the supersymmetric case), just like four dimensional Minkowski space. Jun 19, 1992 ... ... inhomogeneous expanding and recollapsing universe in 3+1 dimensions. ... Subjects: High Energy Physics - Theory (hep-th). [ReadMore..]
Neutron-Capture Theory Of Element Formation In An Expanding ...
The neutron-capture theory of element formation by non-equilibrium processes has been extended to include explicitly the effect of the expansion of the universe, and the resulting equations have been solved on an electronic digital computing machine. Inclusion of the universal expansion is found to require an increase by a factor of five of the density of matter chosen for the start of the element-forming process over that previously found necessary to represent the observed relative abundance distribution of elements in a static universe. The following physical conditions lead to agreement in the over-all trend of theoretical with observed abundances: the element-forming process is taken to start at \ensuremath{\sim}140 sec after the "beginning" of the universal expansion; at this time the temperature is \ensuremath{\sim}1.3\ifmmode\times\else\texttimes\fi{}${10}^{9}$\ifmmode^\circ\else\textdegree\fi{}K\ensuremath{\simeq}0.11 Mev, the neutron-proton ratio is 7.33:1, and the density of matter is \ensuremath{\ Neutron-Capture Theory of Element Formation in an Expanding Universe. Ralph A. Alpher and Robert C. Herman. Phys. Rev. 84, 60 – Published 1 October 1951. [ReadMore..]
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Validity Of Expanding Universe Theory—Static Universe Still ...
This note questions the validity of the Expanding Universe Theory with simple mathematics and shows Static Universe is still consistent with Hubble's Law ... [ReadMore..]
Mystery Of Universe's Expansion Rate Widens With New Hubble ...
The universe is getting bigger every second — but how fast? Astronomers using NASA's Hubble Space Telescope say they have crossed an important threshold in revealing a discrepancy between the two key techniques for measuring the universe's expansion rate. Apr 25, 2019 ... Dark energy may also be the reason for the universe's accelerated expansion today. The new theory suggests that there was a third dark-energy ... [ReadMore..]
