What is the density of dark matter?

What is the density of dark matter?

The average density of dark matter over the entire universe is estimated to be 2.2×10−27 kg/m3 (sometimes quoted in the odd units of 1.2×10−6 GeV/cm3 or the more astrophysical 3.2×10−8 M⊙/pc3).

What is the density of dark energy?

Dark energy is thought to be very homogeneous and not very dense, and is not known to interact through any of the fundamental forces other than gravity. Since it is quite rarefied and un-massive—roughly 10−27 kg/m3—it is unlikely to be detectable in laboratory experiments.

How is dark matter calculated?

Calculation of dark matter 2 / 2 = (tu/tp)2 /2 = 0.32×10122 [1, pg. 30]. This value corresponds to the value of dark matter in Table 1, where HDM = 0.33×10122 is given.

How is dark matter distribution in galaxies?

It is distributed evenly throughout the universe, not only in space but also in time – in other words, its effect is not diluted as the universe expands. The even distribution means that dark energy does not have any local gravitational effects, but rather a global effect on the universe as a whole.

Is dark matter denser?

Most galaxies contain significantly more mass in dark matter than in luminous matter, but this isn’t because it’s more dense — the dark matter halo is simply much larger. In the case of the dark matter surrounding our Milky Way, it’s also spherical and not effectively flat, like the bright part of the galaxy is.

What is the size of dark matter?

The team used the assumption that the only force acting on Dark Matter is gravity, and calculated that Dark Matter particles must have a mass between 10-3 eV and 107 eV. That’s a much tighter range than the 10-24 eV — 1019 GeV spectrum which is generally theorised.

Does dark matter have a high density?

The dark matter density near the solar system, from what I could find, sits at around 0.006 solar masses per cubic parsec, which is a set of units that’s not going to make much sense unless you’re a professional astrophysicist. This is extremely low density.

What is dark matter relic density?

The density of a specific particle at the time of freeze-out is known as the relic density for this particle since its abundance remains constant (see Fig. 5). We know that a supersymmetric particle like the neutralino is a good dark matter candidate: it is electrically neutral, weakly interacting, and massive.

Where is dark matter most concentrated?

In the present-day galaxy, dark matter – shown in red – is more concentrated near the center and it rotates more rapidly (effect exaggerated). Dark matter map for a patch of sky based on gravitational lensing analysis of a Kilo-Degree survey.

Is dark matter heavier than light?

Physicists previously estimated that dark matter particles had to be lighter than the “Planck mass” – about 1.2 x 10^19 GeV, at least a 1,000 times heavier than the largest-known particles — yet heavier than 10^minus 24 eV to fit with observations of the smallest galaxies known to contain dark matter, he said.

What matter is densest?

A superhot substance recently made in the Large Hadron Collider (pictures) is the densest form of matter ever observed, scientists announced this week. Known as a quark-gluon plasma, the primordial state of matter may be what the entire universe was like in the immediate aftermath of the big bang.

Where is dark matter most dense?

Within any of these collections of dark matter (technically called halos) surrounding a galaxy or a collection of galaxies, the dark matter is densest at the center, and becomes gradually more diffuse the further out you go.

What is thermal dark matter?

particles can be defined as those particles which are created. thermally, while dark matter axions come mostly from. non-thermal processes. In thermal creation one imagines that early on, when the Universe.

What is a relic particle?

In cosmology, the relic abundance of a given elementary particle is a measure of the present quantity of that particle remaining from the Big Bang.

Does dark matter have weight?

Is dark matter negative mass?

In the first simulation, all particles have positive mass. In the second one, 84% of particles (the observed fraction of dark matter) have a negative mass.