On the commonness of Earth like life in the multiverse
Warning! you are moving into more speculative areas.
Contents
Deriving a framework from sensible seeming claims
Arrow of time as an absolute minimum basis for life
Sensible seeming claims:
- All life bearing universes need an arrow of time. Otherwise perception and information processing would not be possible. So we have time.
- Most universes that contain life will have a long time stable construction kit capable of forming structures akin to our periodic table of elements. Particles that can form and retain complex geometric patterns.
3D space and periodic table construction kit
Assuming the big bang as spontaneous demixing event that minimizes complexity for life bearing universes (to get that arrow of time):
- Universes that contain life may (big may) come by far most common with a flat 3D space
- 3D Universes that contain life will be most common with a periodic table of elements of minimal but sufficient complexity. As few as possible but just as much as necessary chemical elements. Ours is about 100 elements long. Maybe it's an exceptionally tight squeeze and almost all live bearing universes have a periodic table that looks almost exactly like ours.
Gravity
A force (at least phenomenological) (akin to our gravity) at a vastly larger scale than the scale of the construction kits forces seems to be necessary for local spacial aggregation of the construction kit.
Extreme sparseness seems to be a recurring theme in this world.
- Concrete implementations of a possibility for a big number of construction kit particles space are always unfathomably sparse
- Math is unfathomably sparse and very deceptively so (We know the least numbers of the numbers that are the most common. The uncountable reals numbers minus the countable rationals (if you accept the real numbers as "real" that is – some mathematicians question this), and math has is full of holes
- In 3D graphic computer game simulation there always this island of geometry floating around very close to the origin surrounded by a humongous void of virtual black. Yes this is not really physical space like a vacuum (that is never really truly empty) but just floating point numbers in the computer that happen to not exploit their representative capabilities near their borders of their representative capabilities because of several reasons that might lead off-topic ...
The sparseness that gravity locally counteracts is in physical space rather than combinatorial space.
A pint to ponder about maybe.
Features of Earh like life that may be common in the multiverse
Two eyedness
Assuming the above motivated commonness of live bearing universes comong with a 3D space Two eyedness for stereoscopic vision seems also common. Especially for larger multiverse-animals
Quadrupedalism, Bipedalism
A small scale construction kit in 3D space plus gravity gives planets. So for larger multiverse-animals quadrupedal seems sensible. A similar evolution to the human one to bipedalism for hands as tools use seems thinkable.
Skin
Skin is a natural solution to optimization problems when one makes ore complex structures with various delicacies and performanced.
See: Passivation (disambiguation).
What kinds of skins seems rather unclear. We have lots of examples on Earth there very likely are much more options.
Limits of predictability and unknowable surprises
Of course we fundamentally can't exclude completely different solutions for conscious life bearing universes that we can't even begin to imagine ... These need to be similar in likelihood (big bang demixing entropy) to our example though.
- If too unlikely then they can't contribute to both the commonness of earthy like and anything very different in the multiverse.
- If too likely then we would most likely be there instead of here.
So if very different life bearing universes with a similar commonness/likelyhood do "multiverse-pseudoexist" then it seems necessayry that there mist be a lot of them
To phrase it maybe more comprehensibly: If there would only be a few vastly different alternatives to conscious life bearing universes, then it would be very unlikely that their commonness/likelyhood very closely matches the commonness/likelyhood of our example. And note that it must lie very very close. Since every single added bit in demixing information halves the likelihood of the generated universe (simulation hypothesis perspective).
