Researchers try to find the first light of the universe.

"Researchers are using simulations and data from the South Pole Telescope to detect the faint Sunyaev-Zel’dovichn, kSZ effect, a key to understanding the Epoch of Reionization, when the first stars ionized the universe." (ScitechDaily, Cosmic Archaeology: Unraveling the Mystery of the Universe’s First Light)

"Imagine taking a journey back to the very early days of the universe, specifically, the start of the Epoch of Reionization (EoR). That’s when the first stars and galaxies formed, and their energy separated the protons and electrons of the dense, dark primordial hydrogen gas that comprised the universe, producing bubbles of ionized gas." (ScitechDaily, Cosmic Archaeology: Unraveling the Mystery of the Universe’s First Light)

South Pole Observatory has a big mission. That is to find the first light. That term means photons, which came from the Big Bang or the first stars. The first light makes it possible to think about the location where the Big Bang happened. In modern models, black holes formed before the material. 

The gravity effect formed those black holes straight from wave movement. That causes the theorem that some of those primordial black holes are trapped photons from the Big Bang to their orbiter. 

"Scientists are studying the Epoch of Reionization (EoR), a period when the first stars and galaxies ionized hydrogen, illuminating the early universe. Using data from the South Pole Telescope and simulations, researchers aim to detect the faint kSZ effect, which helps understand the timing and process of reionization, even though they haven’t found the signal yet." (ScitechDaily, Cosmic Archaeology: Unraveling the Mystery of the Universe’s First Light)

It tells things like what stars looked like before planets especially rocky planets born. The photon's ability to make internal superposition makes it possible. That photon can close information into its internal state. The photon can carry exact information from the point. And conditions where it is born. 

Modern quantum systems can trap photons. And drive information out from them using superposition and entanglement. The system reads that information like a quantum computer. But the problem is: how to find a photon that comes straight from the first stars? 

Theoretically is possible to find those photons from the early, or young universe because it's possible. They scatter in some molecular clouds. And if those particles reflect enough effectively, that reflection can trap those photons from the early universe into that cloud for a very long time. 

Or maybe, some theoretical primordial black hole pulled those photons to orbit it.  Sometimes, a black hole releases photons. But the fact is that. It's hard to separate the first light from the light, that was born long after the Big Bang. 

The thing that makes the first light research interesting is that there is no time on photons. Photons carry information the same way as the heavier particle, neutrino. The photon should exist forever if it once released. Information touches the photon like a plaque. And it's possible. That some first light photon carries information straight from the Big Bang. 

https://en.wikipedia.org/wiki/Sunyaev–Zeldovich_effect 

Dark matter and gravitons are the biggest mysteries in the universe.

 Dark matter and gravitons are the biggest mysteries in the universe. 

Could an extremely small primordial black hole that is smaller than gluon be the source of gravitational radiation and gravitational waves? 

If a graviton is an extremely small primordial black hole. That explains dark energy. The atom-size or smaller black holes can be stable. If they get enough energy. Those small black holes interact similar way as the larger black holes. And there are energy beams also in those small black hole's poles. The energy that leaves those poles could be the thing called dark energy. 

If those small black holes are between quarks and gluons they could send radiation into both particles. The pushing radiation that comes out from primordial black holes would impact into quark and gluon. There those particles will take that energy into their quantum field. 

When those quarks and gluons send radiation that they get from that primordial black hole back there is forming a channel where a larger energy beam covers smaller but higher energy beam. So that primordial back hole would be in the tunnel. Where it sends radiation into that quark and gluon. Because gluon is smaller than quark lots of radiation that comes from quarks travels through the gluon. 

Can dark matter made of gravitons? The answer is that nobody knows. The graviton is a hypothetical particle. That could be the link between the fourth- and the third dimension. 

The fourth dimension is the energy level where 3D material cannot interact with 4D material. So graviton could be the hole between energy levels or spaces. In some theories hypothetical graviton is an extremely small black hole, that brings energy from a higher dimension. 

A black hole is an object between 4D and 3D worlds. And graviton would be the extremely small black hole. But in some other models, the graviton could be a whirl- or spiral-looking gravitational field. So the graviton would be a virtual particle. 

The idea is this: a black hole pulls material and radiation in it. During that process, the black hole loads that material with a very high energy level. Then there is material that falls from the fourth dimension. And when those two materials are impacting the energy travels from higher energy material into lower energy particles. And that energy flow causes gravitational radiation. 

The thing is that dark matter will not probably form purely gravitons. But dark matter involves an element that makes gravitation interact also between visible and dark matter. So there could be gravitons also in dark matter. That gravitational interaction tells that there is something that causes the gravitational effect, but that thing doesn't interact in any other way. 

https://bigthink.com/starts-with-a-bang/dark-matter-gravitons/

https://scitechdaily.com/understanding-the-mysteries-of-the-cosmos-new-clues-to-dark-matter-from-primordial-black-holes/

https://scitechdaily.com/primordial-black-holes-the-size-of-an-atom-what-new-experimental-evidence-suggests/