Can sterile neutrinos be dark matter?

Sterile neutrinos are introduced to explain the observed neutrino masses. These particles can be of great cosmological and astrophysical significance. ~ keV, it can be the dark matter. Different production mechanisms result in “colder” or “warmer” DM.

Why do we think dark matter is not in the form of neutrinos?

The reason they can only be hot dark matter is because it is assumed that in the early hot, dense universe, the neutrinos would have been in thermal equilibrium with the hot ordinary matter at that time.

How much of the dark matter could neutrinos be?

Given the constraints we have today, we can conclude that approximately 0.5% to 1.5% of the dark matter is made up of neutrinos. This isn’t insignificant; the light neutrinos in the Universe have about the same mass as all the stars in the Universe.

What is neutralino dark matter?

Neutralinos as dark matter candidates With current measurements of h tending to lie in the range 0.6-0.7, this indicates that much of the dark matter required on the galactic scale and beyond must be non-baryonic. A prime candidate for non-baryonic dark matter is the Lightest Supersymmetric Particle (LSP).

What particles make up dark matter?

Most dark matter is thought to be non-baryonic in nature; it may be composed of some as-yet undiscovered subatomic particles. The primary candidate for dark matter is some new kind of elementary particle that has not yet been discovered, in particular, weakly interacting massive particles (WIMPs).

Is Higgs boson a neutrino?

We present a realization of the idea that the Higgs boson is mainly a bound state of neutrinos induced by strong four-fermion interactions.

Is dark matter and antimatter the same?

Dark matter is considered not to be “regular” matter, of the kind that makes up cats, smartphones, and stars. On the other hand, antimatter, a staple of science fiction, conjures exotic images but is actually regular matter.

Why is dark matter important?

Understanding dark matter is important to understanding the size, shape and future of the universe. Understanding dark matter will also aid in definitively explaining the formation and evolution of galaxies and clusters. As a galaxy spins it should be torn apart.

Are neutrinos exotic matter?

In this sense, theorists use the term “exotic” as a catchall: it might mean something strange and new, but it doesn’t have to. Some non-baryonic dark matter might consist of a particle that’s been known about for many years: the neutrino.

Is dark matter related to dark energy?

And what’s the difference between dark energy and dark matter? In short, dark matter slows down the expansion of the universe, while dark energy speeds it up. Dark energy is the far more dominant force of the two, accounting for roughly 68 percent of the universe’s total mass and energy.

Do right handed neutrinos exist?

Such is the case for charged leptons, like the electron, but within the standard model the right-handed neutrino does not exist. So absent the sterile right chiral neutrinos to pair up with the left chiral neutrinos, even with Yukawa coupling the active neutrinos remain massless.

Are Neutralinos WIMPs?

Neutralinos are the SUSY candidate for WIMPs, the best motivated from particle physics.

Given the constraints we have today, we can conclude that approximately 0.5% to 1.5% of the dark matter is made up of neutrinos. This isn’t insignificant; the light neutrinos in the Universe have about the same mass as all the stars in the Universe.

Is dark matter being created among the universe?

Anyway, our universe is cyclic, yes. Dark matter isn’t created in our universe because our universe isn’t a creation from nothing. The main practice of our universe shows to be “a continuous…

Does dark matter have structure?

According to modern models of physical cosmology, a dark matter halo is a basic unit of cosmological structure. It is a hypothetical region that has decoupled from cosmic expansion and contains gravitationally bound matter. A single dark matter halo may contain multiple virialized clumps of dark matter bound together by gravity, known as subhalos.

What is black matter in space?

Dark Matter is the theoretical material that exists in space that does not emit or reflect light.