Gravitation and dark energy

Francisco J vergara 

If we look back at our principles of gravity it will be clear that objects tend to attract each other’s. If we apply that to the universe, knowing that the universe is full of matter the attractive force between matters will pull all matter together. If we know this we could say that in theory the expansion of the universe had to slow, to a point that it would stop and recollapse.  But certainly that’s not happening. In fact recent studies prove that the universe has been accelerating. But what is causing the universe to accelerate it expansion? Maybe there is something wrong with the Einstein theory of gravity? We really don’t know but Theorists gives the solution a name ‘Dark energy’

But what is Dark energy after I make my research in this topic I realize that there is more unknown than know, the only know is that it’s affecting the universe expansion. In fact we could say that practically nothing is known and that’s what makes this topic so interesting. There are some theories about dark energy first we have Einstein theory that says that empty space can possess its own energy and  as more universe come into existence there would be more energy and so on this continuous expansion and acquirement of energy will cause the universe to accelerate faster and faster but this is only a theory.

Another theory that I found pretty interesting is that dark energy could be a new form of energy fluid or field. But this is no normal energy at least not as we know it, this kind of new energy will have an effect on the universe expansion that is totally the opposite of that of normal matter and energy. If it it’s totally opposite that could perfectly explains why universe is accelerating. Matter and normal energy will cause the universe expansion to slow down but this kind of unknown energy will cause it to accelerate. If we take a look at the numbers we could see that there’s only 5% of normal matter in the universe 75% of dark energy and 25% of dark matter. Then it is obvious that there is more energy making the universe to expand that the energy that is making it to slow down. Theorist call this energy "quintessence," , but all this is a theory we don’t know if it really exist and if that was the case we don’t know why it’s there and so the mystery continues. 

Maybe the only theory is that Einstein was wrong but this would affect the expansion of the universe as we know it. In fact this would lead to decide a solution to this dark energy problem. But what it would be? Another gravity theory? If another gravity theory would be the solution. What it would be? There are lot of theories but we can’t prove them at least not we the knowledge we have in our days. I am anxious that someday preferably not too far scientist could be able to solve this whole mystery once and for all, and came with a new theory of gravity if that is the case.

Here is a link to an article that I found interesting about a new method to see gravitation and dark energy: http://hubblesite.org/newscenter/archive/releases/2010/26/full/