III. Ecosmos: A Revolutionary Fertile, Habitable, Solar-Bioplanet, Incubator Lifescape

2. Computational Systems Physics: Self-Organization, Active Matter

Many scientific fields are in the process of a major shift from reduction to emergence such as Systems Biology, Genetics, Neuroscience, and Chemistry, as this site reports. By finding and cataloging the particles and linear laws of cosmic and material realms, this phase has well plumbed materiality and spacetime. But a Google search for “Systems Physics” does not get any results. A curious inversion seems to occur whence this fundament atomic pursuit since Greece and Rome to Newton’s day may be the last to reconceive itself. A developmental self-organization from galaxies to genomes to Gaia does not appear in large colliders. Physicist advocates such as Philip Anderson, Brian Josephson, Robert Laughlin, Lee Smolin, Nigel Goldenfeld, William Bialek and many others are now trying to move beyond a benthic theory of everything to a recurrent vitality everywhere. A Systems Physics to reunite and reinvent quantum and cosmos from which life, intelligence and personhood in community are meant to emerge is an overdue imperative.

A companion aspect of an innate vital spontaneity has become known by an Active Matter phrase. It was first used by the Indian physicist Sriram Ramaswamy in 2010 to designate a novel form of self-propelled material motion. As the quote notes, the endeavor has since engaged many self-assembled and mobile phases. A “Soft Matter” version studies all manner structural properties of pliable biomolecular and cellular forms. A common implication seems to be an innate mathematical source that serves to structure and guide the gravid spontaneity of a procreative evolution and history.

Active matter is composed of large numbers of active "agents", each of which consumes energy in order to move or to exert forces. Such systems are intrinsically out of thermal equilibrium. Active matter systems break time reversal symmetry because energy is being continually dissipated by the individual constituents. Most examples of active matter are biological in origin and span the scales from bacteria and self-organising bio-polymers to schools of fish and flocks of birds. (Wikipedia)

2020: While systems biology and systems chemistry have become distinct research endeavors (see sections herein), this title phrase, which should be equally obvious, has not come into wider use (no hits on Google). The olden divide between life sciences and a mechanical physics is deeply rooted. This section went online in the mid 2000s for contributions that began to scope out the endemic presence of dynamically interconnected environs from universe to human. The current scientific revolution has now well advanced toward a natural unified, animate ecosmos, as Active Matter attests. Other sections such as A Survey of Common Principles contain more entries about complex network self-organizations everywhere.

Corbetta, Alessandro and Federico Toschi. Physics of Human Crowds. Annual Review of Condensed Physics. 14/311, 2023.
Drossel, Barbara. Strong Emergence in Condensed Matter Physics. arXiv:1909.01134.
Green, Sara and Robert Batterman. Making Sense of Top-Down Causation: Universality and Functional Equivalence in Physics and Biology. Voosholz, J and M. Gabriel, eds.. Top_Down Causation and Emergence. Cambridge: MIT Press, 2021.
Hidalgo, Jorge, et al. Cooperation, Competition and the Emergence of Criticality in Communities of Adaptive Systems. Journal of Statistical Mechanics. March, 2016.
Koorehdavoudi, Hana and Paul Bogdan. A Statistical Physics Characterization of the Complex Systems Dynamics. Nature Scientific Reports. 6/27602, 2016.

Kresic, Ivor, et al. Generating Multiparticle Entangled States by Self-Organization of Driven Ultracold Atoms. arXiv:2208.10111.
Nakamura, Eita and Kunihiko Kaneko. Statistical Evolutionary Laws in Music Styles. Nature Scientific Reports. 9/15993, 2019.
Perc, Matjaz. Beauty in Artistic Expressions through the Eyes of Networks and Physics. Journal of the Royal Society Interface. March 11, 2020.
Rodriguez, Quentin. Idealizations and Analogies. arXiv:2110.12712.
Rovelli, Carlo. The Relational Interpretation of Quantum Physics. arXiv:2109.09170.

2023:

Emergent Universe Project. www.emergentuniverse.org/emp. A new site by a diverse consortium of the Institute for Complex Adaptive Matter, a multi-campus research program of the University of California, the San Francisco Exploratorium, and the science museums of Chicago and Minnesota. Members include David Pines, veteran complexity theorist and founding co-director of ICAM (earlier of the Santa Fe institute), Piers Coleman, professor of physics at Rutgers, and Linda Feferman, a producer of educational films to convey emergent principles. Search the site for goodies, watch for coming attractions. A significant sign in the air of a revolution to a genesis cosmos which innately gives rise to personal life and mind.

The breathtaking quality of emergence lies in its broad applicability, from ants to people, and from electrons to galaxies. We assume that we can sing and dance together because we are intelligent and coordinate our behavior, and so it is surprising to see the coordinated chirping of crickets, and shocking to discover that the same principles apply to mindless things such as water molecules arranging themselves in a crystalline structure to form ice. When you get enough things together, and they interact in just the right way, they suddenly shift to coherent behavior. Emergent principles may govern the smallest units of matter, as in electrons humming together within a superconductor, to the largest, as when entire galaxies clump into regular patterns. Scientists across multiple fields have found that such systems don't require a central ringleader directing the way – their self-organization is inevitable, due to the local interactions of nearest neighbors.

Heinz von Foerster 100 Self-Organization and Emergence Congress. www.univie.ac.at/hvf11/congress/EmerQuM.html. Heinz von Foerster (1911-2002) was an Austrian American physicist, philosopher and a pioneer of cybernetics and systems theory. This centenary conference was held in November 2011 in Vienna with a dual focus on Self-Organization and Emergence in Nature and Society, and Emergent Quantum Mechanics. Keynoters for the first topic are Albert-Laszlo Barabasi, John Holland and Didier Sornette, and for the other Stephen Adler, Gerard ‘t Hooft, and Lee Smolin. Abstract are available for these talks, and some fifty others such as Emergence, Gravity, and Thermodynamics by Bei-Lok Hu, reviewed in A Thermodynamics of Life.

I review the proposal made in my 2004 book, that quantum theory is an emergent theory arising from a deeper level of dynamics. The dynamics at this deeper level is taken to be an extension of classical dynamics to non-commuting matrix variables, with cyclic permutation inside a trace used as the basic calculational tool. With plausible assumptions, quantum theory is shown to emerge as the statistical thermodynamics of this underlying theory, with the canonical commutation-anticommutation relations derived from a generalized equipartition theorem. Brownian motion corrections to this thermodynamics are argued to lead to state vector reduction and to the probabilistic interpretation of quantum theory, making contact with phenomenological proposals for stochastic modifications to Schroedinger dynamics. (Adler)

Highly interconnected networks with amazingly complex structure de-scribe systems as diverse as the World Wide Web, our cells, social systems or the economy. In the past decade we learned that most of these networks are the result of self-organizing processes governed by simple but generic laws, resulting in architectural features that makes them much more similar to each other than one would have expected by chance. I will discuss the recurring patterns of our interconnected world and its implications to network robustness and spreading processes. (Barabasi)

Various classical systems are discussed that can be approached with standard statistical methods. It is shown how quantum mechanical procedures can be applied to such systems to study features such as large-distance behavior. As a result, one finds that the time evolution of its large distance correlations can be written in terms of rigorously quantum mechanical Schroedinger equations. One concludes that even though the dynamical laws are classical, the probability distributions are described by quantum states, showing quantum entanglement. These quantum states violate Bell's inequalities. The suspicion that our universe is also described by such a classical, deterministic underlying theory leads to a natural interpretation of quantum mechanics. (Gerard ‘t Hooft)

Quantum Systems In and Out of Equilibrium. ergodic.ugr.es/cp. A site for a June 2017 seminar at the University of Granada, Spain, which we note as an example of current frontiers in this fundamental realm in the later 2010s. Some 20 theorists spoke such as Sandu Popescu, Beatriz Olmos, and Hans Briegel, with available Abstracts. It is sponsored by the UG Statistical Physics Group, linked to this site.

The aim of this meeting is to bring together scientists interested in Quantum aspects of Thermalization, Quantum Transport, Quantum Effects in Macroscopic Systems (condensed matter, biology, etc.), Quantum Computation, Open Quantum Systems, Quantum Fluctuations and Large Deviations, and Quantum Thermodynamics.

STATPHYS25. http://www.statphys25.org/index.htm. A site for this 25th International Conference on Statistical Physics of the International Union of Pure and Applied Physics, held July 2013 in Seoul, Korea. We cite two presentations as examples of the field’s turn to and melding with nonlinear complexity and its application to living systems. The first Abstract is for “The Complexity, Modularity and Evolution of Self-Assembling Structures in Biology” by Sebastian Ahnert, a University of Cambridge biophysicist, and the second for “Statistical Physics of Driven DNA” by Sanjay Kumar, a Banaras Hindu University physicist. Click on Abstract Book Download on this page for the full 700 page volume. See also Advani, Madhu, et al. “Statistical Mechanics of Complex Neural Systems and High Dimensional Data” by Madhu Advant, et al in Journal of Statistical Mechanics (P03015, 2013) for a similar convergence of many agent physics and many body biology.

One of the most rigorous quantitative definitions of complexity is the notion of algorithmic complexity, discovered independently by Kolmogorov and Chaitin. It is based on the idea that the length of the shortest algorithmic description of a set of data can tell us about the complexity of the data. Here we will employ this principle to measure the physical complexity of a structure, with a particular focus on self-assembling biological structures. Self-assembly is a widespread process in biology, and is essential in the formation of structures such as DNA, protein complexes, and viruses. By minimising the information required to specify the building blocks and interactions that give rise to a structure, we obtain a quantitative measure of the structure’s complexity. Using a genetic algorithm with the building blocks as a genotype and the assembled structure as a phenotype we can investigate a number of questions, including how modularity and symmetry arise in biological evolution. We then apply this approach to study the evolution, assembly and classification of protein complexes and discover new fundamental organising principles, which result in a periodic table of protein quaternary structures. (Anhert Abstract)

The separation of a double stranded DNA to two single stranded DNA below its melting point is a prerequisite for processes like transcription and replication. To execute such processes, various proteins work far away from equilibrium in a staggered way. In this talk, we shall discuss some aspects of unzipping of DNA under a drive in non-equilibrium conditions. We propose the dynamic transition, where without changing the physiological condition, it is possible to bring DNA from the zipped/unzipped state to a new dynamic (hysteretic) state by varying the frequency of the applied force. Our studies revealed that the area of the hysteresis loop grows with the same exponents as of the spin systems. We shall propose a steady state phase diagram of driven DNA, which along with scaling exponents are amenable to verification in force spectroscopic experiments. (Kumar Abstract)

Ambjorn, Jan, et al. The Self-Organizing Quantum Universe. Scientific American. July, 2008. Noted more in the above section, an exemplary case of an integrative cosmology.

Agrawal, Adyant and Sujin Babu. Self-organization in a Bimotility Mixture of Model Microswimmers. Physical Review E. 97/020401, 2018. Within the new APS Physics Subject Headings directory (Google), the Research Areas are collective behavior and self-organized systems, Physical Systems are Active Matter and Multi-Organism Systems, and Techniques is Theories of collective dynamics & active matter, an example of how physical science has lately come to life. Specifically Indian Institute of Technology, New Delhi physicists find such nonlinear, cooperative phenomena to innately manifest itself within mobile microbial populations.

Agrawal, Ankit, et al. Chromatin as Active Matter. Journal of Statistical Mechanics. 014001, 2017. Indian biophysicists pursue a better understanding of genetic phenomena by way of perceiving it as a phase of natural self-activity.

Alexandrov, Dmitri and Andrey Zubarev. Patterns in Soft and Biological Matters. Philosophical Transactions of the Royal Society A. April, 2020. Ural Federal University, Russia bioresearchers introduce a special edition with this title. Papers such as Stochastic Phenomena in Pattern Formation for Distributed Nonlinear Systems, On the Theory of Magnetic Hyperthermia, and Constructive Role of Noise and Diffusion in an Excitable Slow-Fast Population System describe many ways that material substance can come alive, and while showing how living systems arise from physical principles. In each case the manifest presence of an immaterial mathematical realm is evident.

This issue is devoted to theoretical, computer and experimental studies of internal heterogeneous patterns, their morphology and evolution in various soft physical, organic and inorganic materials. Their importance is due to the significant role of internal structures on the macroscopic properties and behaviour of natural and manufactured tissues and materials. Modern methods of computer modelling, statistical physics, heat and mass transfer, statistical hydrodynamics, nonlinear dynamics and experimental methods are presented. Special attention is paid to biological systems such as drug transport, hydrodynamic patterns in blood, protein, insulin crystals and more. (Abstract excerpt)

Allard, Antoine, et al. The Geometric Nature of Weights in Real Complex Networks. Nature Communications. 8/14103, 2017. We note this entry by University of Barcelona, Institute of Complex Systems, theorists including Marian Boguna as a 2017 fulfillment of a constant invariance from cosmos to civilization. As many such papers do, generic network topologies and dynamics are first described, which are then be seen to be instantiated everywhere. This particular works notes their presence from cellular functions to global commerce.

The topology of many real complex networks has been conjectured to be embedded in hidden metric spaces, where distances between nodes encode their likelihood of being connected. Besides of providing a natural geometrical interpretation of their complex topologies, this hypothesis yields the recipe for sustainable Internet’s routing protocols, sheds light on the hierarchical organization of biochemical pathways in cells, and allows for a rich characterization of the evolution of international trade. Here we present empirical evidence that this geometric interpretation also applies to the weighted organization of real complex networks. (Abstract)

Anderson, Philip. More Is Different - One More Time. N. Phuan Ong and Ravin Bhatt, eds. More Is Different. Princeton: Princeton University Press, 2001. The Nobel laureate physicist revisits his landmark 1967 paper which helped turn science from a fixation on subatomic domains to the complexity revolution.

The actual universe is the consequence of layer upon layer of emergence, and the concepts and laws necessary to understand it are as complicated, subtle and, in some cases, as universal as anything the particle folks are likely to come up with. (7)

Ansari, Mohammad and Lee Smolin. Self-Organized Criticality in Quantum Gravity. Classical and Quantum Gravity. 25/095016, 2008. Perimeter Institute theorists advance an early glimpse of nature’s actual innate tendency to seek and maintain itself in an active balance between two coincidental, often complementary opposite states.

We study a simple model of spin network evolution motivated by the hypothesis that the emergence of classical spacetime from a discrete microscopic dynamics may be a self-organized critical process. Self-organized critical systems are statistical systems that naturally evolve without fine tuning to critical states in which correlation functions are scale invariant. We study several rules for evolution of frozen spin networks in which the spins labeling the edges evolve on a fixed graph. We find evidence for a set of rules which behaves analogously to sand pile models in which a critical state emerges without fine tuning, in which some correlation functions become scale invariant. (Abstract)

Armengol-Collado, Joseh-Maria, et al. Epithelia are multiscale active liquid crystals. Nature Physics. September, 2023. University of Leiden biophysicists including Luca Giomi post another current contribution that combines new understandings of complex living systems while proceeding on to ground their features in a conducive physical ground. See also Hexanematic crossover in epithelial monolayers depends on cell adhesion and cell density by Julia Eckert, et al in Nature Communications. (14/5762, 2023) and Biophysicists Uncover Powerful Symmetries in Living Tissue by Elise Cutts in Quanta (October 26, 2023) for an extensive news review.

Biological processes such as embryogenesis, wound healing and cancer rely on the ability of epithelial cells to coordinate their mechanical activity over length scales that are orders of magnitude larger than the cellular size. Although this process is regulated by signalling pathways, it has recently become evident that this coordination can be understood using physics tools, of which liquid crystal order is a prominent example. In this Letter, we combine in vitro experiments, numerical simulations and analysis to show that both nematic and hexatic order are present in epithelial layers. Our work provides a method to decipher epithelial structure and lead to a predictive mesoscopic theory of tissues. (Abstract)

If there’s one central idea in tissue biophysics, coauthor (Luca) Giomi said, it’s that structure gives rise to forces, and forces give rise to functions. In other words, controlling multiscale symmetry could be part of how tissues add up to more than the sum of their cells. There’s “a triangle of form, force and function.”. Cells use their shape to regulate forces, and these in turn serve mechanical functionality.” (Quanta)

Nematic: relating to or denoting a state of a liquid crystal in which the molecules are oriented in parallel but not arranged in well-defined planes. The hexatic phase is a state of matter that is between the solid and the isotropic liquid phases in two dimensional systems of particles.

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