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George Jaroszkiewicz

Print publication date: 2016

Print ISBN-13: 9780198718062

Published to Oxford Scholarship Online: January 2016

DOI: 10.1093/acprof:oso/9780198718062.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 21 April 2021

Absolute time

Absolute time

(p.133) 14 Absolute time
Images of Time

George Jaroszkiewicz

Oxford University Press

This chapter discusses Newton’s concept of absolute time and its use in classical mechanics. It defines clocks and our freedom to change them, that is, reparametrization of time. The chapter goes on to discuss Aristotelian and Galilean–Newtonian space-times. It explains how Newton’s first law of motion is required to correlate successive copies of space. It discusses the differences between the Newtonian paradigm of motion and the use of Lagrangians in the Calculus of Variations that gives the Euler–Lagrange equations of motion in advanced mechanics. The chapter concludes with a discussion of phase space, Hamiltonians, Poisson brackets, and the role of the Hamiltonian as a generator of translation in time.

Keywords:   absolute time, Aristotelian space-time, Galilean–Newtonian space-time, Lagrangians, Calculus of Variations, Euler-Lagrange equations, phase space, Hamiltonians, Poisson brackets, generators, time translation

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