abstracts on TOEs, ERHs, MUHs and SUSs

[Guest guest]

and so..from Max Tegmark:

 

 

 

....some physical consequences of what might be called ``the ultimate

ensemble theory'', where not only worlds corresponding to say

different sets of initial data or different physical constants are

considered equally real, but also worlds ruled by altogether different

equations. The only postulate in this theory is that all structures

that exist mathematically exist also physically, by which we mean that

in those complex enough to contain self-aware substructures (SASs),

these SASs will subjectively perceive themselves as existing in a

physically ``real'' world. We find that it is far from clear that this

simple theory, which has no free parameters whatsoever, is

observationally ruled out. The predictions of the theory take the form

of probability distributions for the outcome of experiments, which

makes it testable. In addition, it may be possible to rule it out by

comparing its a priori predictions for the observable attributes of

nature (the particle masses, the dimensionality of spacetime, etc)

with what is observed.

 

 

.....explore physics implications of the External Reality Hypothesis

(ERH) that there exists an external physical reality completely

independent of us humans. I argue that with a sufficiently broad

definition of mathematics, it implies the Mathematical Universe

Hypothesis (MUH) that our physical world is an abstract mathematical

structure. I discuss various implications of the ERH and MUH, ranging

from standard physics topics like symmetries, irreducible

representations, units, free parameters and initial conditions to

broader issues like consciousness, parallel universes and Godel

incompleteness. I hypothesize that only computable and decidable (in

Godel's sense) structures exist, which alleviates the cosmological

measure problem and help explain why our physical laws appear so

simple. I also comment on the intimate relation between mathematical

structures, computations, simulations and physical systems.

 

********************* ******************* ***************** *********

 

 

 

and it's all nothing at all.

 

..b b.b.