Mell Does dark energy decay?
Dark energy could slowly decay away. Rather than an all-at-once change, dark energy could undergo a slow conversion into particle/antiparticle pairs or radiation, similar to how black holes will eventually decay.
What does dark matter decay into?
A lifetime of a few hundred billion years or longer is still on the table, meaning that it’s possible that in the very far future, maybe even while the stars are still burning, dark matter will decay away into normal matter, antimatter, and/or radiation, after all.
Does dark matter last forever?
Number one: There’s a lot of it, about five times more than “ordinary” matter. In fact, the thinking goes, dark matter will still be around even when the universe is quintillions (that’s billions of billions) years old—maybe even forever. Though invisible, dark matter exerts gravity just like other matter.
Is dark matter constant?
Specifically, when the volume of the universe doubles, the density of dark matter is halved, but the density of dark energy is nearly unchanged (it is exactly constant in the case of a cosmological constant).
Is dark energy repulsive gravity?
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. This leads to a repulsive force, which tends to accelerate the expansion of the universe.
Why does dark energy exist?
One explanation for dark energy is that it is a property of space. As more space comes into existence, more of this energy-of-space would appear. As a result, this form of energy would cause the universe to expand faster and faster.
What could we do with dark matter?
If we can understand and measure the particle properties of dark matter, we may be able to create conditions that coax it into annihilating with itself, leading to the release of energy via Einstein’s E=mc^2, and the discovery of a perfect spacecraft fuel.
Can gravity be attractive?
Gravitational force -an attractive force that exists between all objects with mass; an object with mass attracts another object with mass; the magnitude of the force is directly proportional to the masses of the two objects and inversely proportional to the square of the distance between the two objects.
Does the dark exist?
Darkness does not exist, there is only an absence of Light. Though these two facts may be true, our perception of the cold and darkness can be debilitating. But, we humans can withstand extreme cold with proper clothing and the belief of never ending darkness if we have hope that the sun will rise.
How does dark matter decay to ordinary matter?
The dark matter decays to ordinary matter particles which in turn decay to electrons and positrons. This second stage of decays calls for some rather unappetizing mathematics, so we use a computer program called PYTHIA. There are two versions: one was written in Fortran, and the other in C++. I opted for the C++ version.
Is there such thing as cold dark matter?
In other words, dark matter must have been “cold” even in the very early stages of the Universe, as opposed to hot or warm. for a new particle of any mass, including the light dark matter scenario that would fit with the Atomki anomaly or modestly heavier dark matter that would align with DAMA/LIBRA.
How can scientists see the effect of dark matter?
To even have a chance at seeing the effect of a dark matter particle, scientists have had to come up with a bunch of outlandish experiments. One of those is the XENON observatory, which is essentially a giant tank containing 3.5 tons of liquid xenon sitting in a laboratory nearly a mile underground.
How is the Higgs boson decaying to dark matter?
The ATLAS Collaboration searched the full LHC Run 2 dataset to set the strongest limits on the Higgs boson decaying to invisible dark-matter particles to date. At the LHC, the most sensitive channel to search for direct decays of the Higgs boson to invisible particles is via the so-called vector boson fusion (VBF) production of the Higgs boson.