I'm not sure what you mean by that, but the Heat Death will be a low temperature event.
Perhaps a Universe consisting of photons at a 'temperature' of 2.78 K.
Remember though that low temperature does not necessarily mean low energy.
In our earthly domain, the bitterly cold North Sea contains loads more energy than a boiling kettle.
According to Ethan Siegel, the Universe will never reach absolute zero: https://www.forbes.com/sites/starts...-the-universe-will-never-reach-absolute-zero/
It's a long read, but he concludes, "Based on the value of the cosmological constant we infer today, that means a black-body spectrum of radiation with a temperature of ~10^-30 K will always permeate all of space, no matter how far into the future we go".
It's a long read, but he concludes, "Based on the value of the cosmological constant we infer today, that means a black-body spectrum of radiation with a temperature of ~10^-30 K will always permeate all of space, no matter how far into the future we go".
Roger Penrose's model for a cyclical universe is perhaps as good a guess as you'll get as to how the Universe has emerged from (almost) nothing:
https://www.nobelprize.org/prizes/physics/2020/penrose/facts/
Penrose describes the entire picture of the Universe that we see today as one 'aeon' in a succession of aeons.
His model predicts that much of the matter in the Universe will eventually be dragged into ultra-massive black holes. As the Universe expands and cools to near absolute zero, those black holes will “boil away” through a phenomenon called Hawking Radiation, resulting in a Universe dominated by photons.
Penrose says at this point, the Universe begins to look much as it did at its start, setting the stage for the start of another aeon.
https://www.nobelprize.org/prizes/physics/2020/penrose/facts/
Penrose describes the entire picture of the Universe that we see today as one 'aeon' in a succession of aeons.
His model predicts that much of the matter in the Universe will eventually be dragged into ultra-massive black holes. As the Universe expands and cools to near absolute zero, those black holes will “boil away” through a phenomenon called Hawking Radiation, resulting in a Universe dominated by photons.
Penrose says at this point, the Universe begins to look much as it did at its start, setting the stage for the start of another aeon.
Does he say that the boiled away energy is what is "reused" in the next iteration? How is that explained?
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Penrose's explanation of why the Universe goes from a cold empty state to a hot dense state relies on something called "conformal rescaling".
This complex piece of mathematics says that both the size of the Universe and time itself cease to be relevant in these extreme states.
The cold empty state and the hot dense state are in effect located on different timelines. The cold empty state would continue on forever in its timeline, but the hot dense state it gives rise to effectively inhabits a new timeline all its own.
Does all this sound improbable to you? Don't worry as it all sounds improbable to Penrose's peers as well!
This complex piece of mathematics says that both the size of the Universe and time itself cease to be relevant in these extreme states.
The cold empty state and the hot dense state are in effect located on different timelines. The cold empty state would continue on forever in its timeline, but the hot dense state it gives rise to effectively inhabits a new timeline all its own.
Does all this sound improbable to you? Don't worry as it all sounds improbable to Penrose's peers as well!
Interesting idea, by coincidence Penroses's book The Emperors New Mind is next on my reading list. If I can make any sense of it, I'll let you know!