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Exoplanet Biosignatures: A Review of Remotely Detectable Signs of Life
A comprehensive overview of the current understanding of potential exoplanet biosignatures, including gaseous, surface, and temporal biosignature features, focuses particularly on advances made since the seminal review by Des Marais et al.
The algorithmic origins of life
It is proposed that the emergence of life may correspond to a physical transition associated with a shift in the causal structure, where information gains direct and context-dependent causal efficacy over the matter in which it is instantiated.
Exoplanet Biosignatures: Future Directions
A Bayesian method for guiding future directions for detection of life on exoplanets is introduced and examples for how the Bayesian formalism could guide future search strategies are provided.
Origins of life: a problem for physics, a key issues review
- S. Walker
- PhysicsReports on progress in physics. Physical Society
- 14 August 2017
A forward look towards considering what it might take for a physical theory that universally explains the phenomenon of life to arise from the seemingly disconnected array of ideas proposed thus far is considered.
How causal analysis can reveal autonomy in models of biological systems
- William Marshall, Hyunju Kim, S. Walker, G. Tononi, Larissa Albantakis
- BiologyPhilosophical Transactions of the Royal Society A…
- 25 August 2017
It is suggested that analysing the causal organization of a system, including key features like intrinsic control and stable causal borders, should prove relevant for distinguishing life from non-life, and thus could also illuminate the origin of life problem.
Prebiotic network evolution: six key parameters.
The origins of life likely required the cooperation among a set of molecular species interacting in a network, and six parameters emerge as the most influential when one considers the molecular characteristics of the best candidates for the emergence of biological information: polypeptides, RNA-like polymers, and lipids.
Top-Down Causation and the Rise of Information in the Emergence of Life
- S. Walker
- 21 July 2014
An emerging conceptual framework suggesting that the origin of life may be identified as a transition in causal structure and information flow is reviewed and some of the implications for understanding the early stages chemical evolution are detailed.
Formal Definitions of Unbounded Evolution and Innovation Reveal Universal Mechanisms for Open-Ended Evolution in Dynamical Systems
It is found that state-dependent dynamics, regarded as a hallmark of life, statistically out-performs other candidate mechanisms, and is the only mechanism to produce open-ended evolution in a scalable manner, essential to the notion of ongoing evolution.
Autocatalytic replication and homochirality in biopolymers: is homochirality a requirement of life or a result of it?
The model extends previous theories by treating the origin of life and theorigin of chirality as aspects of the same model by considering simultaneous synthesis and polymerization of left- and right-handed monomers.
Inform: A toolkit for information-theoretic analysis of complex systems
- Douglas G. Moore, Gabriele Valentini, S. Walker, M. Levin
- Computer ScienceIEEE Symposium Series on Computational…
- 1 November 2017
Evidence is presented that suggests that Inform's computational performance is at least comparable to the Java Information Dynamics Toolkit (JIDT), which is taken to be the gold-standard for the field.