Time and Life in the Relational Universe: Prolegomena to an Integral Paradigm of Natural Philosophy
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An Interpretation of Milne Cosmology
An Interpretation of Milne Cosmology Alasdair Macleod University of the Highlands and Islands Lews Castle College Stornoway Isle of Lewis HS2 0XR UK [email protected] Abstract The cosmological concordance model is consistent with all available observational data, including the apparent distance and redshift relationship for distant supernovae, but it is curious how the Milne cosmological model is able to make predictions that are similar to this preferred General Relativistic model. Milne’s cosmological model is based solely on Special Relativity and presumes a completely incompatible redshift mechanism; how then can the predictions be even remotely close to observational data? The puzzle is usually resolved by subsuming the Milne Cosmological model into General Relativistic cosmology as the special case of an empty Universe. This explanation may have to be reassessed with the finding that spacetime is approximately flat because of inflation, whereupon the projection of cosmological events onto the observer’s Minkowski spacetime must always be kinematically consistent with Special Relativity, although the specific dynamics of the underlying General Relativistic model can give rise to virtual forces in order to maintain consistency between the observation and model frames. I. INTRODUCTION argument is that a clear distinction must be made between models, which purport to explain structure and causes (the Edwin Hubble’s discovery in the 1920’s that light from extra- ‘Why?’), and observational frames which simply impart galactic nebulae is redshifted in linear proportion to apparent consistency and causality on observation (the ‘How?’). distance was quickly associated with General Relativity (GR), and explained by the model of a closed finite Universe curved However, it can also be argued this approach does not actually under its own gravity and expanding at a rate constrained by the explain the similarity in the predictive power of Milne enclosed mass. -
Resolving Hubble Tension with the Milne Model 3
Resolving Hubble tension with the Milne model* Ram Gopal Vishwakarma Unidad Acade´mica de Matema´ticas Universidad Auto´noma de Zacatecas, Zacatecas C. P. 98068, ZAC, Mexico [email protected] Abstract The recent measurements of the Hubble constant based on the standard ΛCDM cos- mology reveal an underlying disagreement between the early-Universe estimates and the late-time measurements. Moreover, as these measurements improve, the discrepancy not only persists but becomes even more significant and harder to ignore. The present situ- ation places the standard cosmology in jeopardy and provides a tantalizing hint that the problem results from some new physics beyond the ΛCDM model. It is shown that a non-conventional theory - the Milne model - which introduces a different evolution dynamics for the Universe, alleviates the Hubble tension significantly. Moreover, the model also averts some long-standing problems of the standard cosmology, for instance, the problems related with the cosmological constant, the horizon, the flat- ness, the Big Bang singularity, the age of the Universe and the non-conservation of energy. Keywords: Milne model; ΛCDM model; Hubble tension; SNe Ia observations; CMB observations. arXiv:2011.12146v1 [physics.gen-ph] 20 Nov 2020 1 Introduction The Hubble constant H0 is one of the most important parameters in cosmology which mea- sures the present rate of expansion of the Universe, and thereby estimates its size and age. This is done by assuming a cosmological model. However, the two values of H0 predicted by the standard ΛCDM model, one inferred from the measurements of the early Universe and the other from the late-time local measurements, seem to be in sever tension. -
Structure Formation in a Dirac-Milne Universe: Comparison with the Standard Cosmological Model Giovanni Manfredi, Jean-Louis Rouet, Bruce N
Structure formation in a Dirac-Milne universe: comparison with the standard cosmological model Giovanni Manfredi, Jean-Louis Rouet, Bruce N. Miller, Gabriel Chardin To cite this version: Giovanni Manfredi, Jean-Louis Rouet, Bruce N. Miller, Gabriel Chardin. Structure formation in a Dirac-Milne universe: comparison with the standard cosmological model. Physical Review D, Ameri- can Physical Society, 2020, 102 (10), pp.103518. 10.1103/PhysRevD.102.103518. hal-02999626 HAL Id: hal-02999626 https://hal.archives-ouvertes.fr/hal-02999626 Submitted on 28 Jun 2021 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Copyright PHYSICAL REVIEW D 102, 103518 (2020) Structure formation in a Dirac-Milne universe: Comparison with the standard cosmological model Giovanni Manfredi * Universit´e de Strasbourg, CNRS, Institut de Physique et Chimie des Mat´eriaux de Strasbourg, UMR 7504, F-67000 Strasbourg, France Jean-Louis Rouet Universit´ed’Orl´eans, CNRS/INSU, BRGM, ISTO, UMR7327, F-45071 Orl´eans, France Bruce N. Miller Department of Physics and Astronomy, Texas Christian University, Fort Worth, Texas 76129, USA † Gabriel Chardin Universit´e de Paris, CNRS, Astroparticule et Cosmologie, F-75006 Paris, France (Received 15 July 2020; accepted 12 October 2020; published 13 November 2020) The presence of complex hierarchical gravitational structures is one of the main features of the observed universe. -
Putting Space in Place: Philosophical Topography and Relational
Putting Space in Place: Philosophical Topography and Relational Geography 1. Introduction: Space and Geography Although a discipline often characterized as essentially spatial in its orientation, geography seems only very seldom to have devoted significant attention to exploring the concept of space itself. Indeed, the shift in geographical thinking over the last fifty years or so towards a mode of thinking that takes space as bound up with social and political process actually serves to reinforce, rather than rectify, the neglect of space itself within geographical theorizing. A similar point could also be made with respect to many of the theorists on whom geography draws. Both Foucault and Lefebvre, for instance, while they emphasize the inextricability of the spatial and the socio-political, nevertheless rely upon a notion of space that remains essentially unarticulated and largely unexplored. Just what the phenomenon of space might be that is at issue in the various spatialities and spatializations that appear in their work thus remains obscure (in spite of Lefebvre’s own claims) – and it is no less so in most of the other thinkers who have been taken up within recent geographic discourse or in the geographical appropriations of their thought. Thus from Deleuze through to Sloterdijk spatial ideas and images are constantly in play, and yet what is at issue in the very idea of space and the spatial is almost never directly addressed. In this latter respect, any criticism of geographical theory for its relative neglect of space cannot be restricted to geography alone – with some notable exceptions, very few thinkers, no matter what the discipline, have given serious attention to the phenomenon of space, any more than to the phenomena of time and of place, but have tended instead to deal with various forms or modes of space – to spatialities rather than to space as such. -
The Legacy of S Chandrasekhar (1910–1995)
PRAMANA c Indian Academy of Sciences Vol. 77, No. 1 — journal of July 2011 physics pp. 213–226 The legacy of S Chandrasekhar (1910–1995) KAMESHWAR C WALI Physics Department, Syracuse University, Syracuse, NY 13244-1130, USA E-mail: [email protected] Abstract. Subrahmanyan Chandrasekhar, known simply as Chandra in the scientific world, is one of the foremost scientists of the 20th century. In celebrating his birth centenary, I present a bio- graphical portrait of an extraordinary, but a highly private individual unknown to the world at large. Drawing upon his own “A Scientific Autobiography,” I reflect upon his legacy as a scientist and a great human being. Keywords. White dwarfs; Chandrasekhar limit; relativistic degeneracy. PACS Nos 01.65.+g; 01.60.+q; 97; 97.10.Cv 1. Introductory remarks: Man on the ladder When I stepped into Chandra’s office for the first time in 1979, I was immediately intrigued by a photograph that faced him from the wall opposite his desk. As I stood looking at it, Chandra told me the following story. He had first seen the photograph on the cover of a New York Times Magazine and had written to the magazine for a copy (figure 1). He was referred to the artist, Piero Borello. Borello replied that Chandra could have a copy, even the original, but only if he cared to explain why he wanted it. Chandra responded: “What impressed me about your picture was the extremely striking manner in which you visually portray one’s inner feelings towards one’s accomplishments: one is half-way up the ladder, but the few glimmerings of structure which one sees and to which one aspires are totally inaccessible, even if one were to climb to the top of the ladder. -
2013 Volume 2
2013 Volume 2 The Journal on Advanced Studies in Theoretical and Experimental Physics, including Related Themes from Mathematics PROGRESS IN PHYSICS “All scientists shall have the right to present their scientific research results, in whole or in part, at relevant scientific conferences, and to publish the same in printed scientific journals, electronic archives, and any other media.” — Declaration of Academic Freedom, Article 8 ISSN 1555-5534 The Journal on Advanced Studies in Theoretical and Experimental Physics, including Related Themes from Mathematics PROGRESS IN PHYSICS A quarterly issue scientific journal, registered with the Library of Congress (DC, USA). This journal is peer reviewed and included in the ab- stracting and indexing coverage of: Mathematical Reviews and MathSciNet (AMS, USA), DOAJ of Lund University (Sweden), Zentralblatt MATH (Germany), Scientific Commons of the University of St. Gallen (Switzerland), Open-J-Gate (India), Referativnyi Zhurnal VINITI (Russia), etc. Electronic version of this journal: APRIL 2013 VOLUME 2 http://www.ptep-online.com Editorial Board CONTENTS Dmitri Rabounski, Editor-in-Chief [email protected] Hafele J. C. Causal Version of Newtonian Theory by Time–Retardation of the Gravita- Florentin Smarandache, Assoc. Editor tional Field Explains the Flyby Anomalies............... ........................3 [email protected] Cahill R.T. and Deane S.T. Dynamical 3-Space Gravitational Waves: Reverberation Larissa Borissova, Assoc. Editor Effects............................................... ........................9 [email protected] Millette P.A. Derivation of Electromagnetism from the Elastodynamics of the Space- Editorial Team timeContinuum...................................... .......................12 Gunn Quznetsov [email protected] Seshavatharam U. V.S. and Lakshminarayana S. Peculiar Relations in Cosmology . 16 Andreas Ries Heymann Y. Change of Measure between Light Travel Time and Euclidean Distances . -
Edward Milne's Influence on Modern Cosmology
ANNALS OF SCIENCE, Vol. 63, No. 4, October 2006, 471Á481 Edward Milne’s Influence on Modern Cosmology THOMAS LEPELTIER Christ Church, University of Oxford, Oxford OX1 1DP, UK Received 25 October 2005. Revised paper accepted 23 March 2006 Summary During the 1930 and 1940s, the small world of cosmologists was buzzing with philosophical and methodological questions. The debate was stirred by Edward Milne’s cosmological model, which was deduced from general principles that had no link with observation. Milne’s approach was to have an important impact on the development of modern cosmology. But this article shows that it is an exaggeration to intimate, as some authors have done recently, that Milne’s rationalism went on to infiltrate the discipline. Contents 1. Introduction. .........................................471 2. Methodological and philosophical questions . ..................473 3. The outcome of the debate .................................476 1. Introduction In a series of articles, Niall Shanks, John Urani, and above all George Gale1 have analysed the debate stirred by Edward Milne’s cosmological model.2 Milne was a physicist we can define, at a philosophical level, as an ‘operationalist’, a ‘rationalist’ and a ‘hypothetico-deductivist’.3 The first term means that Milne considered only the observable entities of a theory to be real; this led him to reject the notions of curved space or space in expansion. The second term means that Milne tried to construct a 1 When we mention these authors without speaking of one in particular, we will use the expression ‘Gale and co.’ 2 George Gale, ‘Rationalist Programmes in Early Modern Cosmology’, The Astronomy Quarterly,8 (1991), 193Á218. -
Philosophy of Spa E and Time
Topicsin Philosophy of Physics: Philosophy of Space and Time Philosophy 426 T 1:10-4:10pm, 210 Miller Hall J. North ([email protected]) We will focus on the following question. Do space and time exist in addition to material objects? In modern terms: does spacetime exist? We will look at his- torical and contemporary arguments from physics and philosophy. One theme will be that it is not clear what the traditional debate amounts to, nor whether it is a substantive dispute. Our aim is to better understand this dispute and how it could be decided in favor of one side or the other. Time and student interest permitting, we may discuss related issues in the philosophy of space and time. Readings Required books, available at the bookstore (https://tinyurl.com/F18-Course-Material-730426) and on reserve at the Alexander Library undergraduate circulation desk: John Earman, World Enough and Space-Time Robert Geroch, General Relativity from A to B Nick Huggett, Space from Zeno to Einstein Tim Maudlin, Philosophy of Physics: Space and Time Hans Reichenbach, The Philosophy of Space and Time Optional books (at the bookstore and on reserve at Alexander): Michael Friedman, Foundations of Space-Time Theories Lawrence Sklar, Space, Time, and Spacetime All other readings are available at the course website (address given out in class) Prerequisites I will assume that you have had some high school physics (for instance, F = ma should be familiar to you), but this needn’t be at your ngertips. I assume no background in philosophy, although one previous course is recommended. -
The Early Universe, Review Problems 1
MASSACHUSETTS INSTITUTE OF TECHNOLOGY Physics Department Physics 8.286: The Early Universe September 27, 2013 Prof. Alan Guth REVIEW PROBLEMS FOR QUIZ 1 QUIZ DATE: Thursday, October 3, 2013, during the normal class time. QUIZ COVERAGE: Lecture Notes 1, 2 and 3; Problem Sets 1, 2, and 3; Wein- berg, Chapters 1-3, Ryden, Chapters 1, 2, and 3. (While all of Ryden’s Chapter 3 has been assigned, questions on the quiz will be limited to Section 3.1. The material in Sections 3.2 and 3.3 will be discussed in lecture later in the course, and you will not be responsible for it until then. Section 3.4 (for the κ = 0 case) may help you understand the cosmological Doppler shift, also discussed in Lecture Notes 2, but there will be no questions specifically focussed on Ryden’s discussion.) One of the problems on the quiz will be taken verbatim (or at least almost verbatim) from either the homework assignments, or from the starred problems from this set of Review Problems. The starred problems are the ones that I recommend that you review most care- fully: Problems 2, 4, 7, 12, 15, 17, 19, and 22. The starred problems do not include any reading questions, but parts of the reading questions in these Review Problems may also recur on the upcoming quiz. PURPOSE: These review problems are not to be handed in, but are being made available to help you study. They come mainly from quizzes in previous years. Except for a few parts which are clearly marked, they are all problems that I would consider fair for the coming quiz. -
Sir Arthur Eddington and the Foundations of Modern Physics
Sir Arthur Eddington and the Foundations of Modern Physics Ian T. Durham Submitted for the degree of PhD 1 December 2004 University of St. Andrews School of Mathematics & Statistics St. Andrews, Fife, Scotland 1 Dedicated to Alyson Nate & Sadie for living through it all and loving me for being you Mom & Dad my heroes Larry & Alice Sharon for constant love and support for everything said and unsaid Maggie for making 13 a lucky number Gram D. Gram S. for always being interested for strength and good food Steve & Alice for making Texas worth visiting 2 Contents Preface … 4 Eddington’s Life and Worldview … 10 A Philosophical Analysis of Eddington’s Work … 23 The Roaring Twenties: Dawn of the New Quantum Theory … 52 Probability Leads to Uncertainty … 85 Filling in the Gaps … 116 Uniqueness … 151 Exclusion … 185 Numerical Considerations and Applications … 211 Clarity of Perception … 232 Appendix A: The Zoo Puzzle … 268 Appendix B: The Burying Ground at St. Giles … 274 Appendix C: A Dialogue Concerning the Nature of Exclusion and its Relation to Force … 278 References … 283 3 I Preface Albert Einstein’s theory of general relativity is perhaps the most significant development in the history of modern cosmology. It turned the entire field of cosmology into a quantitative science. In it, Einstein described gravity as being a consequence of the geometry of the universe. Though this precise point is still unsettled, it is undeniable that dimensionality plays a role in modern physics and in gravity itself. Following quickly on the heels of Einstein’s discovery, physicists attempted to link gravity to the only other fundamental force of nature known at that time: electromagnetism. -
Space, Time, and Ontology in Classical and Quantum Gravity
WHATEVER IS NEVER AND NOWHERE IS NOT: SPACE, TIME, AND ONTOLOGY IN CLASSICAL AND QUANTUM GRAVITY by Gordon Belot B.Sc., University of Toronto, 1991 M.Sc., University of Toronto, 1993 Submitted to the Graduate Faculty of University of Pittsburgh in partial fulfillment of the requirements for the degree of Doctor of Philosophy University of Pittsburgh 1996 John Earman Joseph Camp Adolf Grünbaum John Norton Carlo Rovelli ii WHATEVER IS NEVER AND NOWHERE IS NOT: SPACE, TIME, AND ONTOLOGY IN CLASSICAL AND QUANTUM GRAVITY Gordon Belot, Ph.D. University of Pittsburgh, 1996 Substantivalists claim that spacetime enjoys an existence analogous to that of material bodies, while relationalists seek to reduce spacetime to sets of possible spatiotemporal relations. The resulting debate has been central to the philosophy of space and time since the Scientific Revolution. Recently, many philosophers of physics have turned away from the debate, claiming that it is no longer of any relevance to physics. At the same time, there has been renewed interest in the debate among physicists working on quantum gravity, who claim that the conceptual problems which they face are intimately related to interpretative questions concerning general relativity (GR). My goal is to show that the physicists are correct—there is a close relationship between the interpretative issues of classical and quantum gravity. In the first part of the dissertation I challenge the received view that substantivalism has a commanding advantage over relationalism on grounds internal to GR. I argue that this view is based on a misconception of the relationships between realism and substantivalism, and between empiricism and relationalism. -
Reading List in Philosophy of Spacetime and Symmetry David Wallace, June 2018
Reading list in Philosophy of Spacetime and Symmetry David Wallace, June 2018 1. Introduction .............................................................................................................................................. 2 2. Math and Physics resources ...................................................................................................................... 4 3. The substantivalist/relationist debate ...................................................................................................... 6 4. The Hole Argument ................................................................................................................................. 10 5. General Covariance, Background Independence, and the Meaning of Coordinates.............................. 13 6. Dynamical vs geometrical approaches to spacetime theories ............................................................... 15 7. Spacetime structure in pre-relativistic physics ....................................................................................... 17 8. Spacetime topics in quantum gravity ..................................................................................................... 18 9. Philosophy of Symmetry ......................................................................................................................... 19 10. Other topics in special and general relativity ....................................................................................... 22 A note on electronic resources When I include a book