Dark energy is a false problem?
Dark energy is the deepest mystery of modern cosmology. Astronomers believe that this is an unknown form of energy that seems responsible for the accelerated expansion of the Universe. Today, in a new study led by Professor Edward Kipreos from the University of Georgia, suggests a new approach that if you change the way you think about time expansion, an expected consequence of the theory of relativity, you can get a different explanation of the concept of dark energy.
Modified Newtonian Dynamics (MOND) fits much better:
Source: Begeman, Broeils, &Sanders 1991; Sellwood&McGaugh 2005
We all know that scientists are very curious and, often, they want to get to the finish line first in order to reveal “themselves” the riddles of nature. In this sense, we want to remember the work done in secret by Israeli scientist Mordehai Milgrom that in the 1990’s formulated a modified theory of gravity called MOND, groped to explain the rotation curves of spiral galaxies without dark matter, idea that was not completely accepted. Not only that, but more recently, another scientist of South African origin, George Ellis, introduced a hypothesis more ‘light’ to explain the accelerated cosmic expansion. The idea behind this proposal is the assumption that our position in the Milky Way is in a sort of giant cosmic void or bubble cosmic that is a region of space where the average density of matter would be much lower than the total thus causing a local rate of expansion greater than elsewhere. Again, the existence of gigantic cosmic voids seems unlikely since it would not explain the uniformity of the cosmic microwave background not to mention the apparently uniform distribution of galaxies.
Today, it was the turn of Edward Kipreos, a molecular geneticist who for some years has started to become interested in cosmology and relativity theory. In his article, published in the journal PLOS ONE, Kipreos takes part of the concept of time dilation, physical phenomenon that manifests itself in the duration of an event, recognized by an observer traveling with constant speed and with rectilinear and uniform, an effect that becomes relevant and significant only at speeds approaching that of light. The scientist introduces a hypothesis according to which the time dilation is directional, rather than reciprocal, with respect to the motorcycle for which it is only the object that moves to face the expected effect from special relativity.
According Kipreos, this phenomenon can be easily understood in the context of the operation of the GPS satellites. “The satellites move fast enough in relation to the Earth so it is necessary to correct the clocks since they are slowed down because of their orbital velocity,” says Kipreos. “If we had not corrected this relativistic effect, the measurement provided by GPS satellites would be wrong about two miles a day.”
This very simple example is based on Einstein’s theory and the so-called Lorentz transformations i.e. coordinate transformations between two inertial reference systems that describe the variation of the measurement of time and space when the object of the measure is in uniform motion with respect to observer. “It is supposed that the relativistic effect of time dilation is mutual,” says Kipreos. “If you look at the GPS satellites, the clock is slowing down, but according to the GPS satellites our clock is not slowing down, which it would do in the case of reciprocity. Our clock goes faster than the satellites and we know it for the fact that we are in constant communication.”
We will continue the article with more details about the dark energy in the next post.