Dark Energy Causing Accelerated Expansion Of The Universe
A group of cosmologists and scientists joined together in propagating a theory that dark energy causes expansion of the universe to accelerate
. According to them, it is the affect of this dark energy that works under the cosmic self attraction in matters. Result is the expansion of the universe instead of its contraction.
Scientists from Princeton University as well as the Lawrence Berkeley National Laboratory conducted wide range studies and research on the subject in 1999. At the end of it they arrived at such conclusion.
While dark energy is not fiction, it is also difficult visualizing it as physical science due to its mysterious character. According to eminent cosmologist Saul Perlmutter, the universe itself is made of dark matters. He is seconded by Michael Turner, the cosmologist from Chicago.
Pertinent question is how much matter there is in the universe? And what is the extent of dark matters and dark energy in it? Other related questions are whether the expansion rate is fast or is slowing down and whether the universe is flat. Knowledge about energy in the universe can help solve these questions.
Theories relating the dark energy are also based on the equation describing the evolution of the universe. Such evolutions are also closely related to the theory of relativity advanced by Albert Einstein. It becomes easier for the scientists to make their primary choice from among various competing models by recording and documenting the best observations.
Mass density of the entire universe is estimated by the scientists on the basis of the ratio of visible light mass in large systems such as the galaxies. While multiple other ways are deployed, this is the most widely used method. With such experimentations and researches scientists have been gathering evidence to establish that mass density is low. In the process they have also come to conclude that most of the matters in the universe are dark.
Existence of evidences indicating abundance of dark energy in the universe also leads to other consequential conclusions. Changes in the expansion rates are estimated by comparing the red shifts of various galaxies with the brightness found in them. All these measurements indicate that the universe is expanding.
And evidences also indicate that the universe is flat.