What is Lee Cronin’s Assembly Theory?

Lee Cronin, a distinguished chemist from the University of Glasgow, delves into his provocative theory on the evolution of life and the universe.

The conversation pivots around Cronin’s assembly theory, which posits that all objects in the universe can be measured by their complexity, calculated by the number of steps required to create them.

The assembly index refers to the minimum number of steps needed to recreate an object from its components or subunits.

This concept applies not only to physical objects but also abstract concepts like language and mathematical theories.

Identifying the shortest path or minimum number of steps needed to assemble an object from basic building blocks becomes increasingly difficult as size or complexity increases.

However, shortcuts for this process may exist – for instance, with molecules, one could physically measure their complexity without computationally calculating it.

Applying assembly theory beyond chemistry presents challenges, especially when defining what constitutes an ‘object’.

When dealing with emoticons or images made up of pixels on a 2D plane, determining resolution and surface area become crucial factors in computing their assembly index.

Assembly theory says that if we look at any object in the universe, any object, that we can quantify how complex it is by trying to find the number of steps it took to create it. And also, we can determine if it was built by a process akin to evolution by looking at how many copies of the object there are. – Lee Cronin

Assembly theory is still in its early stages, with many aspects that need further exploration and understanding.

Despite this, the theory offers a fascinating new perspective on how we understand and quantify complexity in both physical objects and abstract concepts.

The four universes according to assembly theory: Assembly Universe, Assembly Possible, Assembly Contingent, and Assembly Observed represent different levels of constraints applied to the creation process.

The shift from Assembly Possible to Assembly Contingent indicates that objects can’t have instantaneous access to all memories without having done the work somehow first.

Objects are built efficiently through propagation over time by taking the shortest path possible due to conservation laws.

However, situations where objects might not take the shortest path due to other driving forces or compromises between multiple objects are acknowledged.

Parallel processing is another element involved in building complex objects where tasks can be completed simultaneously instead of sequentially – something Cronin’s team is currently investigating further through their concept of ‘assembly depth.’

Cronin speculates on potential applications of assembly theory outside of molecules such as economics.

He suggests that capitalism may be effective at finding the shortest path and that systems with complex nested structures can readjust over time to find new shortest paths.

While his theory may not be entirely correct, it provides a framework for identifying processes producing high copy number objects that are also highly complex, which could potentially signal life as we know it.