'dark-zilla (s)' ?? Noooo! Yeees?

A Second Big Bang to start the Cosmos

'dark-zilla'(s) yet could be part and parcel of the second big bang. That is right, a second big bang.

A) It is reasoned that looking in detail at the first big bang, which was a lot of visible fire and radiation it might not have all the ingredients that we see today in our cosmos even after cooling and did not include dark matter. The second big bang a dark big bang actually released the elements we know today and it was  a dark big bang since the elements were released through dark matter, which is matter. Dark Matter is said to constitute 80 % or more matter in the cosmos.

B) This is the paper released by a team, Katherine Freese and Martin Wolfgang Winkler, respectively in Austin, Texas and Sweden. The current paper, of many, is at arXiv.org; 2302.11579, Feb. 22, 2023.

In the present day, there are a lot of postulations that say the matter in our universe often is from dark matter and the idea of cooling the universe from a hot big bang would not have left enough material according to what is noted in today's cosmos.

The authors spend considerable examination toward putting forth the mechanisms that would  bring this Dark Big Bang about. There is no redshift of vacuum energy, so that will evolve later.

When  the dark vacuum decays in a dark phase transition, it can induce significant amounts of  dark matter and dark radiation, e.g. dark sector.

The cosmos is not vacuum dominated at the transition. Densities become the  sources of energy.

'If such non-gravitational interactions existed one would expect the Hot Big Bang to produce not only the visible matter and radiation, but also dark matter', said Martin Winkler. 

There has been years of experimental efforts but no non-gravitational interactions of dark matter have been detected. If gravity is the only force between visible and dark matter, there is no reason for the Hot Big Bang to produce dark matter.

The Dark Big Bang would have created a burst of hot, dark plasma that eventually bubbled out into dark particles. "Similar as the Hot Big Bang creates a hot plasma of the visible sector particles, the Dark Big Bang heats up the dark sector. During the phase transition, the expanding bubble walls carry the energy previously contained in the false vacuum...Here we assumed that the entire false vacuum energy is released"

There is a higher metastable minimum at the false vacuum nucleation with the observable cosmos. The tunneling  of that to the true vacuum will indicate the Dark Big Bang. Bubbles from the true vacuum intrude and will transfer energy. This is time independent.

"Successful dark matter production could then be realized from the annihilation of  domain wall which would play a role of the Dark Big Bang."

Adiabatic perturbations imply some parts of the cosmos could develop at different times. Hence, different regions will undergo Dark Big Bang phase transition at slightly different times.

C) "we will mostly focus on ultra-heavy dark matter particles with masses >> 10 to 10 power GeV which we dub 'dark-zillas' (since they represent a dark sector of version of WIMPzillas)

"Due to the large Lorentz boost of the colliding bubble walls, the produced dark-zillas can be very energtic."

"After the Dark Big Bang, the total number of dark-zillas in the Universe is (typically) conserved"

The authors add in the relics dark-zilla in brief as the result of bubble collision. "If we identify the dark-zillas with Majorana fermions from elastic collisions, the high=energy Fourier modes of colliding bubbles contribute substantially to particle formation...As we already noted, the dark-zillas  may carry substantial amounts of kinetic energy immediately after the Dark Big Bang."

Another paper is similar in a long line of matter contentions: "The Universe is too smooth by half" released in early Feb.'23.