Microscopic Black Holes?

They could be the "dark matter". Microscopic black holes should have evaporated by now according to Hawking, but possibly there's a hitch.

"Small, primordial black holes had previously been ruled out as dark matter candidates because all black holes are thought to "leak" a type of thermal radiation first theorized by Stephen Hawking in 1974 and later named "Hawking radiation."

The smaller a black hole, the more rapidly it should leak Hawking radiation and, thus, the faster it should evaporate. That means if primordial black holes ever existed, the smallest examples shouldn't be around today — yet, dark matter clearly is.

"Primordial black holes with the masses Ana and I are now considering had been essentially previously considered ruled out because they were assumed to have evaporated fully by this time in the universe," Thoss said.

Recent work by Giorgi Dvali, a theoretical physicist at the University of Munich who has collaborated with Thoss and Alexandre, has suggested that the evaporation process breaks down at a certain point, however. This means primordial black holes of the masses the scientists considered could achieve a semi-stable state.

"In order to decrease its mass through the emission of Hawking radiation, the black hole has to 'rewrite' its information, or something else. This rewriting process takes time," Alexandre explained. "It is called 'memory burden' because of this memory that now has to be passed along to something else, and that just kind of slows down the evaporation process overall. So it's a kind of stabilization."

And that "rescue mechanism" means primordial black holes are back as potentially dark matter candidates!"

Source: https://www.space.com/tiny-black-holes-big-bang-prime-dark-matter-suspects

Maybe they devolve into Higgs Bosons...

Could they also be the source of unexplained microwaves from space? If so, could they be harnessed as a future energy source?

If black holes have a certain half life,they will never totally disappear.They could decrease into a microscopic black hole.We do not really know how old the universe is,and the JWT has turned previous ideas on their heads.

We do not know the half life of black holes,we have not been sentient long enough.

Given enough time,what we now see as ultra-massive black holes may decay into nano sized black holes that emit "small"( a relative term) amounts of energy in the form of cosmic rays or microwaves.

A few wild duck thoughts here: I think spacetime is warped because it has to pass through everything. It is deflected by the density, like light going through water because it has a longer path to follow through the smaller gaps in matter than in free space. And a photon always follows the curvature of space time, a self reinforcing effect. A photon leaving the core of the sun takes millions of years to reach the surface, because of the torturous path it must follow through every nook and cranny of the dense matter surrounding it. Less dense matter has a shorter path. A black hole has such high density that the photons may take billions of years to exit. The energy in other forms may be leaked out, but their origins are billions of years old.. The photons may decay into other forms, such as microwaves; The Hawking Radiation.

(THANKS and a hats off to my Druid Priest (via McCallan) muse in the bottle.)

I really do not have anything to add to the conversation, but wanted to thank you, HTRN. I've been lurking here a long time now, and your posts never fail to engage and entertain me. Heck, I've even learned a thing or two along the way. Keep it up!