宇宙不是為人類準備的。這是物理學近百年探索后越來越清晰的結論。

Anthropocentrism is still growing tenaciously. Even in science, it is embodied in the Anthropic Principle: the universe is the way it is today because if it weren't for it, we wouldn't be able to exist to observe it.

It sounds reasonable, but it's actually a circular argument. Logically untenable, physically lacking explanatory power.

The vast majority of the universe is a dead zone: vacuum, dark matter, dark energy, and invisible, cold-dead structures. There is very little place where life can exist. A universe that is "optimized" for life will not look like this.

The more damaging critique came from Boltzmann. At the end of the 19th century, he came up with a counter-intuitive hypothesis: on a sufficiently large time scale, any structure in the universe could randomly "heat fluctuate". The most likely observer, then, is not a human being, but a transient "brain" – with false memories, consciousness, and perception – that then quickly dissipates.

This is the concept of the "Boltzmann brain".

A complete universe with stars, galaxies, gravitational constants, finely tuned...... All require extremely high thermodynamic costs. And an isolated brain, which can be achieved with only a small piece of energy fluctuation, is much more likely than the "whole universe".

If we were Boltzmann's brain, the whole of human knowledge, science, history, would be false.

Carroll directly dismissed this possibility. His reasoning is very physical: if we are a consciousness that fluctuates randomly, then the content of our brain is also random; We can't trust knowledge; And if knowledge cannot be trusted, science denies itself.

Therefore, any model of the universe that allows Boltzmann's brain to become the mainstream observer must be wrong.

The question then arises: how to construct a model of the universe that avoids both the pitfalls of the anthropic principle and the paradox of Boltzmann's brain?

Lee Smalling proposed a radical new framework in the 1990s: Cosmological Natural Selection (CNS), the theory of natural selection in the universe.

This theory treats the universe as a system of reproduction. The way to reproduce is to create black holes, and each black hole may give birth to a "sub-universe". A black hole is not a grave, but a womb. Under this framework, the "success criterion" of the universe is not to produce life, but to produce the most black holes. The "genes" of the fertile universe are replicated and passed on in black holes.

This sounds like an extension of Darwinism on a celestial scale. But it does explain many of the problems that plague cosmology.

For example: Why is our universe so big? Why is gravity attractant? Why are stars mostly spherical? Why Is The Dark Energy Constant That Small? Why did the universe evolve at just the right rate, neither collapsing so rapidly that it was expanding to the point where particles could not combine?

The answer is: these structures favor the formation and distribution of black holes.

The incubation of black holes takes time, gas density, and structural complexity. The universe must expand to a certain scale, galaxies form, and stars collapse to create "high-quality black holes".

Our universe did it.

Some universes with extremely high dark energy can theoretically create a large number of "random black holes" in a vacuum, but these black holes do not contain the information of "replicating the parent structure". They are unstable, uncontrollable, and not fecund. Just like an organism randomly generates DNA, it is either stillborn or malformed.

The black hole in the CNS has a "gene".

Black holes appear to be identical to each other – mass, charge, spin – but if the mechanism of quantum gravity is taken into account, the formation process may determine the physical constants and structure of the "inner universe". This means that only black holes formed under a specific path will give birth to "reproducible subuniverses".

This was a fatal blow to Boltzmann's brain. Because the Boltzmann brain comes from random fluctuations and does not carry "valid information" – it cannot produce the next brain. They have no pedigree and cannot construct evolutionary chains.

The universe in the CNS model has genealogy, genetics, and adaptability. It's not accidental, it's evolutionary. This also explains in the opposite direction why the universe did not create black holes in a simpler way – such as setting extremely high densities in the first place, and dark energy so strong that it directly collapsed in a vacuum. Such a black hole does not have a stable origin structure and cannot reproduce stably.

In the CNS framework, stability and information copying mechanisms are more critical than quantity. The universe we live in is not the simplest, nor the shortest-lived, but it is probably the most "efficient reproduction".

It's not for humans. Not debugged for life. It's just that life happens to find a place when this efficient mechanism is running.

There is no need to overestimate yourself and you do not have to fantasize about the purpose.

The universe is using black holes as nodes to complete self-replication. We, however, are just halfway through.