* Student Author, ** Postdoctoral Fellow Author (Emergence@ASU members underlined)
A.J. Surman, M. Rodriguez-Garcia, Y.M. Abul-Haija, G.J.T. Cooper, P.S. Gromski, R. Turk-MacLeod, M. Mullin, C. Mathis*,S.I Walker and L. Cronin (2019) Environmental control programs the emergence of distinct functional ensembles from unconstrained chemical reactions. Proceedings of the National Academy of Sciences 116, no. 12 (2019): 5387-5392.
H. Kim**, H.B. Smith*, C. Mathis*, J. Raymond and S.I. Walker(2019)Universal scaling across biochemical networks on Earth. Science Advances 5: eaau0149. [online]
B. Daniels, H. Kim**, D. Moore**, S. Zhou*, H.B. Smith*, B. Karas*, S.A. Kauffman, and S.I. Walker (2018) Criticality Distinguishes the Ensemble of Biological Regulatory Networks Phys. Rev. Lett. 121, 138102. [online]
D. Moore**, G. Valentini**, S.I. Walker and M. Levin (2018) Inform: Efficient Information-theoretic Analysis of Collective Behaviors. Frontiers in Robotics and AI. doi: 10.3389/frobt.2018.00060
S.I. Walker, W. Bains, L. Cronin, S. DasSarma, S. Danielache, S. Domagal-Goldman, B. Kacar, N.Y. Kiang, A. Lenardic, C.T. Reinhard, W. Moore, E. Schwieterman, E. Shkolnik and H.B. Smith*(2018) Exoplanet biosignatures: future directions. Astrobiology, 18(6), pp.779-824. https://doi.org/10.1089/ast.2017.1738
N.Y. Kiang, S. Domagal-Goldman, D.C. Catling, Y. Fuji, V.S. Meadows, E. Schwieterman and S.I. Walker (2018) Exoplanet Biosignatures: At the Dawn of a New Era of Planetary Observations. Astrobiology18(6) 619-629 http://doi.org/10.1089/ast.2018.1862
E.W. Schwieterman, N.Y. Kiang, M.N. Parenteau, C.E. Harman, S. DasSarma , T.M. Fisher*, G.N. Arney, H.E. Hartnett, C.T. Reinhard, S.L. Olson, V.S. Meadows, C.S. Cockell, S.I. Walker, J.L. Grenfell, S. Hegde, S. Rugheimer, R. Hu, and T. W. Lyons (2018) Exoplanet Biosignatures: A Review of Remotely Detectable Signs of Life. Astrobiology 18(6): 663 - 708 http://doi.org/10.1089/ast.2017.1729
S.I. Walker, N. Packard and G. Cody (2017) Re-Conceptualizing the Origin of Life. Phil. Trans. Roy. Soc. A. 375:20160337 [online]
W. Marshall, H. Kim**, S.I. Walker,G. Tononi, and L. Albantakis (2017) How Causal Analysis Can Reveal Autonomy in Models of Biological Systems. Phil. Trans. Roy. Soc. A. 375:20160358 [online]
C. Mathis*, S. Ramprasad, S.I. Walker, and N. Lehman (2017) Prebiotic RNA Network Formation: A Taxonomy of Molecular Cooperation. Life 7(4):38. [online]
E. Borriello** and S.I. Walker (2017) An Information Theoretic Classification of Elementary Cellular Automata. Complexity. Article ID 1280351. [online][preprint]
D. Moore**, S.I. Walker, and M. Levin (2017) Cancer as a Disorder of Patterning Information: computational and biophysical perspectives on the cancer problem. Convergent Science Physical Oncology. 3(4): 043001. [online]
A. Adams*, A. Berner*, P.C.W. Davies and S.I. Walker (2017) Physical Universality, State-Dependent Dynamics and Open-Ended Evolution. Entropy. 19(9): 461. [online] (cover article)
S.I. Walker (2017) Origins of Life: A Problem for Physics, A Key Issues Review. Reports on Progress in Physics. 80(9): 092601[online]arxiv:1705.08073
A. Adams* and S.I.Walker (2017) Real-world Open-ended Evolution: A League Of Legends Adventure. International Journal of Design & Nature and Ecodynamics 12: 458-469.
A. Adams*, H. Zenil, P.C.W. Davies and S.I.Walker (2017) Formal Definitions of Unbounded Evolution and Innovation Reveal Universal Mechanisms for Open-Ended Evolution in Dynamical Systems.Scientific Reports. 7: 997. [preprint]arxiv:1607.01750[online]
C. Mathis*, T. Bhattacharya and S.I. Walker (2017) The Emergence of Life as a First Order Phase Transition. Astrobiology 17(3): 266-276. [online][preprint]
P.C.W. Davies and S.I. Walker (2016) The Hidden Simplicity of Biology: A Key Issues Review. Rep. Prog. Phys. 79(10) 102601.
Domagal-Goldman and Wright et al. (includes S.I. Walkerand 45 others) (2016) Astrobiology Primer 2.0. Astrobiology 16(8):561-653. [online]
L. Cronin and S.I. Walker(2016) Beyond Prebiotic Chemistry. Science 352: 1174-1175. DOI:10.1126/science.aaf6310 [online]
S.I. Walker, H. Kim** and P.C.W. Davies (2016) The Informational Architecture of the Cell. Phil Trans A. 2016 374 20150057; DOI: 10.1098/rsta.2015.0057[online]
H. Kim**, P.C.W. Davies and S.I. Walker (2015) New Scaling Relation for Information Transfer in Biological Networks. J. Roy. Soc. Interface12 20150944; DOI: 10.1098/rsif.2015.0944[online]
P. Nghe, W. Hordijk, S. Kauffman, S.I. Walker, F. Schmidt, H. Kemble, J.A.M. Yeates and N. Lehman (2015) Prebiotic Network Evolution: Six Key Parameters. Roy. Soc. Chem. Mol. Biosyst. 11, 3206-3217[online]
S.I. Walker (2014) Top-down causation and the rise of information in the Emergence of Life. Information5, 424-439. [online]
T.Pavlic, A.M. Adams*, P.C.W. Davies and S.I. Walker (2014) Self-referencing cellular automata: A model of the evolution of information control in biological systems. In Proc. Artificial Life XIVarXiv:1405.4070[online]
S.I. Walker, P.C.W. Davies, P. Samantray* and Y. Aharanov (2014) Quantum Non-Barking Dogs. New J. Phys 16: 063026. [online]
S.I. Walker and P.C.W. Davies (2013) The Algorithmic Origins of Life. J. Roy. Soc. Interface 6:20120869 [online] preprint: arXiv:1207.4803
S.I. Walker, B. Callahan, G. Arya, J.D. Barry, T. Bhattacharya, S. Grigoryev, M. Pellegrini, K. Rippe, S.M. Rosenberg (2013) Evolutionary Dynamics and Information Hierarchies in Biological Systems. Annals. N.Y. Acad. Sci. USA. [online]
N. Vaiyda, S.I. Walker and N. Lehman (2013) Recycling of Informational Units Leads to Selection of Replicators in a Prebiotic Soup. Chemistry & Biology 20: 241 – 252. [online]
M. Gleiser and S.I. Walker (2012) Life’s Chirality from Prebiotic Environments. Int. J. Astrobio. 11: 287- 296. [online] preprint: arXiv:1202.5048
M. Wu, S.I. Walker and P.G. Higgs (2012) Autocatalytic Replication and Homochirality in Biopolymers: Is Homochirality a Requirement of Life or a Result of It? Astrobiology 12: 809 – 817. [online]
S.I. Walker, L. Cisneros and P.C.W. Davies (2012) Evolutionary Transitions and Top-Down Causation. Proceedings of Artificial Life XIII. 283-290 [online] preprint: arXiv:1207.4808
S.I. Walker, M.A. Grover and N. V. Hud (2012) Universal Sequence Replication, Reversible Polymerization and Early Functional Biopolymers: A Model for the Initiation of Prebiotic Sequence Evolution. PLoS ONE 7 (4): e34166. [online]
D. Schulze-Makuch, P.C.W. Davies and S.I. Walker (2012) A Series of One-Way Missions to Explore and Colonize Mars.Proceedings of the 2012 Global Space Exploration Conference.
M. Gleiser, B. Nelson and S.I. Walker (2012) Chiral Polymerization in Open Systems From Chiral-Selective Reaction Rates. Orig. Life Evol. Biosph. 42: 333-346. [online]
S.I. Walker (2011) Homochirality, In Encyclopedia of Astrobiology. M. Gargaud (ed.)
M. Gleiser and S.I. Walker (2010) The Chirality of Life: From Phase Transitions to Astrobiology. Astronomy and Relativistic Astrophysics: New Phenomena and New States of Matter in the Universe Proceedings of the Third Workshop (IWARA07). 17 – 30. preprint: arXiv:0811.1291[online]
M. Gleiser and S.I. Walker (2009) Toward Homochiral Protocells in Noncatalytic Peptide Systems. Orig. Life Evol Biosph.39: 479-493. [online]
M. Gleiser, J. Thorarinson and S.I. Walker (2008) Punctuated Chirality. Orig. Life Evol Biosph. 38: 499-508. [online]
M. Gleiser and S.I. Walker (2008) An extended model for the evolution of prebiotic homochirality: A bottom-up approach to the origins of life. Orig. Life Evol. Biosph. 38: 293 – 315. [online]
Book Chapters, Reports
S.I.Walker, P.C.W. Davies, and G.F.R. Ellis (eds.) From Matter to Life: Information and Causality. Cambridge University Press 2017.
S.I.Walker andP.C.W. Davies. The "Hard Problem" of Life. InFrom Matter to Life: Information and Causality. S.I. Walker, P.C.W. Davies and G.F.R. Ellis (eds). Cambridge University Press 2017. [preprint]
S.I.Walker andP.C.W. Davies. From the Origins of Life to the Nature of Intelligence. To appear inComplexity and Society. Princeton University Press.
S.I. Walker. The Descent of Math. In Trick of Truth: The Mysterious Connection Between Physics and Mathematics? A. Aguirre, B. Foster and Z. Merali (ed.) Springer, 2016. [Essay awarded "Out-of the-box-thinking" Prize in 2015 Foundational Questions in Science Institute Essay Contest] [online]
S.I. Walker. Is Life Fundamental? In Questioning the Foundations of Physics: Which of our Fundamental Assumptions are Wrong? Anthony Aguirre, Brendan Foster, Zeeya Merali (Eds.) 2015 Springer [online] [Essay awarded 4th prize in 2013 Foundational Questions in Science Institute Essay Contest]
C. Burrows, S.I. Walker, S. Amin and E.V. Armburst. Alternative Chemistries for Life: Empirical Approaches. A NSF/NASA Report, J.T. Goodwin and D.G. Lynn (eds). 2014 [online]
S.I. Walker. Transition from Abiotic to Biotic: Is There an Algorithm for It? In Astrobiology: An Evolutionary Approach. Vera Kolb ed. 2014 CRC Press. [online]