A Polytechnic University of Valencia, Spain in collaboration with the Department of Physics PhD Physics 2011 Nobel Prize winner Adam Riess, trying to establish a unified model of the universe of dark matter and dark energy.
In the classic “Λ-CDM” cosmological model, the cosmological constant is the constant -1. But astronomical observations indicate that the cosmological constant or changes over time.
A Polytechnic University of Valencia, Spain in collaboration with the Department of Physics PhD Physics 2011 Nobel Prize winner Adam Riess, trying to establish a unified model of the universe of dark matter and dark energy. They explained: “In our new model, the dark matter and dark energy are different manifestations of the same thing in different situations, the latest astronomical observations seem to support the creation of our model.”
In recent years, astronomical observations show that the universe contains about 5% of ordinary matter (stars, nebulae and planets, etc.), 22 percent dark matter and 73% dark energy. Where the dark matter and dark energy, respectively, and show that they do exist through gravitational effects on ordinary matter they produce and promote the accelerated expansion of the universe to do. If dark energy does not exist, the gravitational effects between substances will gradually slow down the expansion of the universe, but astronomical observations show that the universe is accelerating expansion.
To explain dark energy, the scientists constructed a variety of physical models, the most widely accepted is the “Λ-CDM” model, which use the cosmological constant (cosmological constant) to explain the accelerating expansion of the universe. The model considers the evolution of the universe entire process, the cosmological constant change has not occurred, the value of the constant is -1. However, this model does not perfectly explain all of the observed phenomena.
Scientists have discovered that dark energy is actually dynamic and change over time. They constantly revised by observing existing models, hoping to find a better description of dark energy cosmological models. Based on current observations, dark energy equation of state parameter is actually relatively close to the constant -1, but there are indications that the argument in the past had different values, but exactly how to determine this value still need more observations.