Time And Science Volume 3 Physical Sciences And Cosmology

Prominent scientists and philosophers of science address contemporary debates on the nature of Time. Their contributions freely discuss its unity and reality, its compatibility with the orders of classical philosophy (present, past and future) and with the disputed idea of free will (Volume 1). They also present a detailed and updated state of the role of Time in the so-called exact sciences: biology - or more precisely genetics, evolution, neurosciences, natural and artificial intelligence (Volume 2), and physics - relativity, quantum mechanics and quantum gravity, and cosmology (Volume 3).

The present volume of Time and Science series is devoted to Physical Sciences and Cosmology. Today more than ever, the question 'is Time an ontological property, a necessary ingredient for the physical description of the world, or a purely epistemological element, relative to our situation in the world?' worry physicists and cosmologists alike. For many of them, Relativity (and particularly General Relativity), as well as its reconciliation with quantum mechanics in the elaboration of a quantum theory of gravitation, points to a negative answer to the first alternative, and leads them to deny the objective reality of time. For others, the answer is nuanced by the evidence of an emerging temporal property when one climbs the scales of the complexity of systems and/or the applicability of the statistical laws of thermodynamics. But for some, the illusion of the unreality of time comes from certain confusions that they denounce, and plead for the re-establishment of time at the heart of physical theories.

Prominent scientists and philosophers of science address contemporary debates on the nature of Time. Their contributions freely discuss its unity and reality, its compatibility with the orders of classical philosophy (present, past and future) and with the disputed idea of free will (Volume 1). They also present a detailed and updated state of the role of Time in the so-called exact sciences: biology - or more precisely genetics, evolution, neurosciences, natural and artificial intelligence (Volume 2), and physics - relativity, quantum mechanics and quantum gravity, and cosmology (Volume 3).

Prominent scientists and philosophers of science address contemporary debates on the nature of Time. Their contributions freely discuss its unity and reality, its compatibility with the orders of classical philosophy (present, past and future) and with the disputed idea of free will (Volume 1). They also present a detailed and updated state of the role of Time in the so-called exact sciences: biology — or more precisely genetics, evolution, neurosciences, natural and artificial intelligence (Volume 2) , and physics — relativity, quantum mechanics and quantum gravity, and cosmology (Volume 3).

Prominent scientists and philosophers of science address contemporary debates on the nature of Time. Their contributions freely discuss its unity and reality, its compatibility with the orders of classical philosophy (present, past and future) and with the disputed idea of free will (Volume 1). They also present a detailed and updated state of the role of Time in the so-called exact sciences: biology -- or more precisely genetics, evolution, neurosciences, natural and artificial intelligence (Volume 2), and physics -- relativity, quantum mechanics and quantum gravity, and cosmology (Volume 3).

Life and Time are very closely linked, because life needs the patience of eons to emerge and evolve, and also due to the precision timing of neural networks in the perception of the world, encoding information, and performing actions. A dozen renowned biologists and neuroscientists collaborate in this volume to explore the various facets of timing in the living world. The temporal programming of the activity of the genetic code controls the essential mechanisms of individual development from zygote to adult, while evolution uses the succession of generations to accomplish its work. For its part, the brain accomplishes the miracle of justifying presentism and reconstructing the continuity of present time from the fragmented data accessible to the senses, as well as measuring durations and dating events. To this end, the brain uses a multilevel temporal coding to transport and decode sensory information and prepare motor responses. It is only gradually that we have discovered the temporal precision of the mechanisms involved, of the order of a few milliseconds or less, for the adjustment of neural networks, or the synaptic plasticity used for memory formation. Today, the perfection of natural neural networks, the energy saving use of spikes of electrical impulses to categorize the sensory environment and to guess its probable future is an example to the modelers and engineers of artificial intelligence.

In this volume, 12 eminent scientists and philosophers engage in fundamental, perennial questions about time: Does time exist? Is 'time' a single or multiple entity? Is it possible to reconcile contradictory notions of time, such as subjective and objective, metaphysics and physics, McTaggart's A series and B series, or presentism and eternalism? Does the Special Theory of Relativity dictate a static, deterministic account of reality ('block universe') or does it allow for 'free will'? How did the concept of geologic time originate and what are the limits of its knowledge? How is the Anthropocene defined? Each author examines these questions from the point of view of their own specialties, but without ignoring the metaphysical importance of the issue, nor the possibility that scientific advances might enforce revisions of our brain intuitive judgments.

Space-Time, Relativity, and Cosmology provides a historical introduction to modern relativistic cosmology and traces its historical roots and evolution from antiquity to Einstein. The topics are presented in a non-mathematical manner, with the emphasis on the ideas that underlie each theory rather than their detailed quantitative consequences. A significant part of the book focuses on the Special and General theories of relativity. The tests and experimental evidence supporting the theories are explained together with their predictions and their confirmation. Other topics include a discussion of modern relativistic cosmology, the consequences of Hubble's observations leading to the Big Bang hypothesis, and an overview of the most exciting research topics in relativistic cosmology. This textbook is intended for introductory undergraduate courses on the foundations of modern physics. It is also accessible to advanced high school students, as well as non-science majors who are concerned with science issues.