For this energy density to be comparable to other forms of matter in the universe, it would require new physics: the addition of a cosmological constant term has profound implications for particle physics and our understanding of the fundamental forces of nature. However, this process is difficult to accomplish.

Astronomy Stack Exchange is a question and answer site for astronomers and astrophysicists. As the Universe is homogeneous, it doesn’t matter where the region is located. The universe (Latin: universus) is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy.While the spatial size of the entire universe is unknown, it is possible to measure the size of the observable universe, which is currently estimated to be 93 billion light-years in diameter. Mass, Size, and Density of the Universe The mass, size, and density of the universe involve very big and very small numbers with large numbers of zeros in front of or behind the decimal point. Sign up to join this community. By energy density, I mean the energy per unit volume. [citation needed] Flat universe.

One of the most fundamental ideas in theoretical cosmology is describing the matter or energy density of baryons, dark matter, dark energy, and radiation at different times during the history of the Universe. And yet, because of the negative energy built into the gravity field created by these particles, the total energy of the universe remains zero. In other words, the energy within a region, divided by the volume of that region. And yet, because of the negative energy built into the gravity field created by these particles, the total energy of the universe remains zero. This option has been ruled out by observations. In other words, the energy within a region, divided by the volume of that region. New high-energy-density physics research provides insights about the universe by University of Rochester Credit: CC0 Public Domain The strength of the pull in question depends in part on the density of the matter in the universe. and the Hubble parameter can be related to a model of expansion with the use of the Friedmann equation.. For early stages of the expansion of the universe, it's energy density was dominated by radiation, … WMAP determined that the universe is flat, from which it follows that the mean energy density in the universe is equal to the critical density (within a 0.5% margin of error). As the Universe is homogeneous, it doesn’t matter where the region is located. The current scientific consensus is that the Universe expanded from a point of super high matter and energy density roughly 13.8 billion years ago.

A Universe with the critical density is said to be flat.

In this view the vacuum energy density currently exceeds the observable energy density in fermions and bosons by a factor of about 10 122 if we average over the observable universe.
It must not be too big or too small though. I'm trying to get an equation for the energy density of matter of the universe $\rho(t)$, assuming the number of particles is conserved and rest mass energy is much greater than kinetic energy. It only takes a minute to sign up. It is the ratio of the mass density of the universe to the "critical density" and is approximately 1. Scientists write such numbers using a special code that keeps them short.
The current scientific consensus of most cosmologists is that the ultimate fate of the universe depends on its overall shape, how much dark energy it contains and on the equation of state which determines how the dark energy density responds to the expansion of the universe. Temperature and Expansion Time in the Standard Big Bang Model In the big bang model of the expansion of the universe, the expansion time can be expressed in terms of the Hubble parameter. The ultimate fate of the universe is a topic in physical cosmology, ... Conversely, a negative cosmological constant, which would correspond to a negative energy density and positive pressure, would cause even an open universe to re-collapse to a big crunch.


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