The General Relevance of the Modified Cosmological Model

Total Page:16

File Type:pdf, Size:1020Kb

The General Relevance of the Modified Cosmological Model The General Relevance of the Modified Cosmological Model Jonathan W. Tooker December 25, 2017 Contents I Introduction ......................................... 1 I.1 An Abstract Psychological Dimension . 1 I.2 The Dual Tangent Space . 6 I.3 Feynman, Functions, and Functionals . 14 II General Relevance with Emphasis on Gravitation . 24 II.1 Relevant Aspects of Classical Physics . 25 II.2 General Relativity . 40 II.3 An Entropic Application . 52 II.4 Complex Coordinates . 53 II.5 What is' ^? .......................................... 57 II.6 Twistors and Spinors . 61 II.7 Dyads and Quaternions . 73 II.8 Unification . 80 III Maximal Symmetry .................................... 89 III.1 The MCM Hypothesis . 89 III.2 Historical Context . 93 III.3 A Few Miscellanea . 98 III.4 Problems One and Two . 102 III.5 What is a Multiplex? . 105 III.6 Problems Three and Four . 106 III.7 Maximally Symmetric Spacetime . 110 III.8 Toward Geodesics . 118 III.9 Dark Energy and Expanding Space . 125 III.10 Advanced and Retarded Potentials . 126 IV Computation and Analysis in Quantum Cosmology . 130 IV.1 The Modified Cosmological Model . 131 IV.2 Tipler Sinusoids . 167 IV.3 MCM Quantum Mechanics . 173 IV.4 Conformalism and Infinity . 198 IV.5 Covering Spaces . 218 IV.6 The Double Slit Experiment . 228 IV.7 Fundamentals of Hypercomplex Analysis . 238 IV.8 Two Stringy Universes in the Information Current . 262 V Death to Detractors ...................................268 Appendices 269 A Synopsis of Historical Development 270 Bibliography 277 1 The stone the builders rejected has become the cornerstone. { Psalm 118:22 I Introduction In lieu of an abstract each chapter in this book will have a description of its contents. This book is focused on recapping, consolidating, streamlining, and annotating previous work related to gravitation and non-relativistic quantum theory while adding a few new insights when they are modest. Throughout this book the reader's familiarity with the modified cosmological model is assumed but not strictly required. The focus of the first section in this chapter is a review of geometry. Section two gives a preliminary overview of an algorithm that will violate conservation of information. In section three we propose to modify Feynman's application of the action principle by replacing the least action complex field trajectories with maximum action hypercomplex field trajectories that still satisfy the action principle. I.1 An Abstract Psychological Dimension It is shocking that after this many years of work on the theory of infinite complexity that the associated material calculated and referred to here is not already well known with the entire field of all possible linear nuance being mapped out to the nth degree. It is surprising that there is no Wikipedia article regarding the modified cosmological model (MCM) or the theory of infinite complexity (TOIC) that spells out all of the trivially derived properties. To that end, consider a cube spanned byx ^,y ^, andz ^. The slices of constant z are the subspaces spanned byx ^ andy ^ at each value of z. Every curve that can be constructed usingx ^ and y^ will be confined to some slice of z. Any curve leaving the slice would have a component in thez ^ direction. Likewise any curve constructed from justx ^ andy ^ will have its tangent vectors confined to that single slice of constant z. The curve's cotangent space is the first place we could possibly come across vectors with a non-vanishingz ^ component. We state these obvious truths because the MCM describes de Sitter (dS) and Anti-de Sitter (AdS) spacetimes as slices of a 5D cube and we want to show the exceptional behavior of our flat universe when it sews together two 5D spaces but is not itself a slice of any 5D space. Now consider flat empty 5-spaces Σ± where general relativity in the absence of 5D matter- energy leads to the desired dynamics in the 4D slices through the Kaluza-Klein metric 2 Figure 1: The region between two adjacent moments of psychological time: H1 and H2. The arrangement immediately suggests a gravitational pilot wave formulation as the path to evolve through the discontinuity of the as-yet-undescribed region inside the null interval between Ω1 and @2 but we will introduce another simpler formulation in this book. We will introduce new χA coordinates ? to accommodate this representation wherein xµ 2H are moved away from the center of the MCM unit cell where we have depicted them in previous work. χ5 is the horizontal direction across this figure. This figure uses the values Φ2, Φ, and 1 to demonstrate Σ? but there are many such arrangements. 2 2 ! gαβ + φ AαAβ φ Aα ΣAB = : (1.1) 2 2 φβ φ In this book we will use the Greek letter χ for the 5D coordinates where we have used ξ previously. Where Latin indices A have previously run from 0 to 4, here they will run from 1 to 5 so ξ4 !χ5. We will add a layer of complexity when we take µ, ν 2f0; 1; 2; 3g in the usual way but then add a subtle convention for α; β 2f1; 2; 3; 4g. In 5D we have A; B 2f1; 2; 3; 4; 5g _ ± A and α; β 2f1; 2; 3; 4g orα; _ β 2f2; 3; 4; 5g. Taking the coordinates of Σ as χ± we will call the ± bulk metrics ΣAB and they will have the form of equation (1.1). Curves in the flat slices of 5 constant χ± can never have tangent vectors that point to the left or right in the cosmological unit cell. Figure 1 shows that cell. The slices @ and Ω are flat slices of χ5 but they appear curved in this figure to demonstrate the curvature associated with the embedded metric of 3 µ α the de Sitter coordinates x± 6=χ±. The oft-lamented \cylinder condition" that the MCM both embodies and motivates from µ first principles [1, 2, 3] says that physics in the 4D worldsheets spanned by χ± can never depend on the fifth coordinate. This can be accomplished via a generalized disallowance 5 of the appearance of χ± in any equations of motion but we can accomplish the same thing 5 by taking our 4D spacetimes as surfaces of constant χ± in the 5D bulk [3]. The ordinary limitation of the cylinder condition on physics is that position and momentum measured in xµ can never depend on x4. However, that doesn't say anything about the abstract coordinates A A A fχ+; χ?; χ−g or vice versa. Here we begin to develop the complex behavior that can be derived by modeling our universe of xµ at the intersection of two 5D spaces Σ±. This is a key point to notice: observables will always be defined on xµ which can, in principle depend on all of the χA coordinates. This contrasts the normal application of Kaluza{Klein theory which says xµ cannot depend on x4. Therefore, even at this early stage, it is apparent that the MCM is very different from the standard cosmological model and other Kaluza{Klein models. One well known issue with standard Kaluza{Klein theory is that the field equations indicate that the electromagnetic field strength tensor must always vanish with respect to 4D general A A A relativity. By adding the 15 chirological coordinates fχ+; χ?; χ−g we have a lot of room to develop novel workarounds. For instance, if the Kaluza{Klein requirement for vanishing electromagnetic strength tensors applies to the chirological coordinates then that puts only µ µ µ a loose constraint on what we do with the x , x?, and x± coordinates. Let χ5 be a non-relativistic psychological dimension with identical topological flatness. 5 5 The identical topological flatness of χ± does not hold for χ? which can have an arbitrary non-linear curvature with tangent vectors pointing anywhere because it has no width in the ? ± path from H1 to H2, as in figure 1. Σ exists only to sew Σ together with a single point so we are not concerned with the overall curvature there. There is no constrained object anywhere in the vector bundle of Σ? so everything about that bundle is introduced as a new MCM degree of freedom. The only constraint on Σ? is that it has at least one point where we can construct a Lorentz frame and then use that point to ensure smooth transport of a Lorentz frame from H1 to H2. The 4D slices of flat 5-space are flat but @ and Ω, themselves slices, are curved and what's more: the only flat space we do have, H, isn't even a slice of a 5-space because Σ± do not contain their boundary at χ5 = 0 which specifies the location of H [3]. H is the unincluded boundary of two 5D half spaces. How can we get a curved slice out of a flat space? These new degrees of freedom beyond H will be helpful. The addition of only one new degree of MCM freedom to go through larger infinity in the hyperreal number system ∗R (via Φ^ n !Φ^ n+1) leads to two new degrees of freedom: the two dimensions of C become hyperreal and hyperimaginary. We will name the system that contains hyperreal and hyperimaginary numbers the hypercomplex number system1 ?C. We point to hyperimaginarity as the reason for the fourth ontological vector 2^ which allows us to use f^i; Φ^; 2^; π^g as a basis for general relativity (or rather we might choose to call the fourth one ^i because it more precisely corresponds to hyperimaginarity.) Our initial desire to add a single degree of freedom in a longitudinal mode along Φ^ showed that fπ;^ Φ^;^ig was incomplete [4, 5].
Recommended publications
  • The Wormhole Hazard
    The wormhole hazard S. Krasnikov∗ October 24, 2018 Abstract To predict the outcome of (almost) any experiment we have to assume that our spacetime is globally hyperbolic. The wormholes, if they exist, cast doubt on the validity of this assumption. At the same time, no evidence has been found so far (either observational, or theoretical) that the possibility of their existence can be safely neglected. 1 Introduction According to a widespread belief general relativity is the science of gravita- tional force. Which means, in fact, that it is important only in cosmology, or in extremely subtle effects involving tiny post-Newtonian corrections. However, this point of view is, perhaps, somewhat simplistic. Being con- arXiv:gr-qc/0302107v1 26 Feb 2003 cerned with the structure of spacetime itself, relativity sometimes poses prob- lems vital to whole physics. Two best known examples are singularities and time machines. In this talk I discuss another, a little less known, but, in my belief, equally important problem (closely related to the preceding two). In a nutshell it can be formulated in the form of two question: What princi- ple must be added to general relativity to provide it (and all other physics along with it) by predictive power? Does not the (hypothetical) existence of wormholes endanger that (hypothetical) principle? ∗Email: [email protected] 1 2 Global hyperbolicity and predictive power 2.1 Globally hyperbolic spacetimes The globally hyperbolic spacetimes are the spacetimes with especially sim- ple and benign causal structure, the spacetimes where we can use physical theories in the same manner as is customary in the Minkowski space.
    [Show full text]
  • The Causal Hierarchy of Spacetimes 3
    The causal hierarchy of spacetimes∗ E. Minguzzi and M. S´anchez Abstract. The full causal ladder of spacetimes is constructed, and their updated main properties are developed. Old concepts and alternative definitions of each level of the ladder are revisited, with emphasis in minimum hypotheses. The implications of the recently solved “folk questions on smoothability”, and alternative proposals (as recent isocausality), are also summarized. Contents 1 Introduction 2 2 Elements of causality theory 3 2.1 First definitions and conventions . ......... 3 2.2 Conformal/classical causal structure . ............ 6 2.3 Causal relations. Local properties . ........... 7 2.4 Further properties of causal relations . ............ 10 2.5 Time-separation and maximizing geodesics . ............ 12 2.6 Lightlike geodesics and conjugate events . ............ 14 3 The causal hierarchy 18 3.1 Non-totally vicious spacetimes . ......... 18 3.2 Chronologicalspacetimes . ....... 21 3.3 Causalspacetimes ................................ 21 3.4 Distinguishingspacetimes . ........ 22 3.5 Continuouscausalcurves . ...... 24 3.6 Stronglycausalspacetimes. ........ 26 ± arXiv:gr-qc/0609119v3 24 Apr 2008 3.7 A break: volume functions, continuous I ,reflectivity . 30 3.8 Stablycausalspacetimes. ....... 35 3.9 Causally continuous spacetimes . ......... 39 3.10 Causallysimplespacetimes . ........ 40 3.11 Globallyhyperbolicspacetimes . .......... 42 4 The “isocausal” ladder 53 4.1 Overview ........................................ 53 4.2 Theladderofisocausality . ....... 53 4.3 Someexamples.................................... 55 References 57 ∗Contribution to the Proceedings of the ESI semester “Geometry of Pseudo-Riemannian Man- ifolds with Applications in Physics” (Vienna, 2006) organized by D. Alekseevsky, H. Baum and J. Konderak. To appear in the volume ‘Recent developments in pseudo-Riemannian geometry’ to be published as ESI Lect. Math. Phys., Eur. Math. Soc. Publ. House, Z¨urich, 2008.
    [Show full text]
  • Chap 7 Berkovitz October 8 2016
    Chapter 7 On time, causation and explanation in the causally symmetric Bohmian model of quantum mechanics* Joseph Berkovitz University of Toronto 0 Introduction/abstract Quantum mechanics portrays the universe as involving non-local influences that are difficult to reconcile with relativity theory. By postulating backward causation, retro-causal interpretations of quantum mechanics could circumvent these influences and accordingly increase the prospects of reconciling quantum mechanics with relativity. The postulation of backward causation poses various challenges for the retro-causal interpretations of quantum mechanics and for the existing conceptual frameworks for analyzing counterfactual dependence, causation and causal explanation, which are important for studying these interpretations. In this chapter, we consider the nature of time, causation and explanation in a local, deterministic retro-causal interpretation of quantum mechanics that is inspired by Bohmian mechanics. This interpretation, the so-called ‘causally symmetric Bohmian model’, offers a deterministic, local ‘hidden-variables’ model of the Einstein- Podolsky-Rosen experiment that poses a new challenge for Reichenbach’s principle of the common cause. In this model, the common cause – the ‘complete’ state of particles at the emission from the source – screens off the correlation between its effects – the distant measurement outcomes – but nevertheless fails to explain it. Plan of the chapter: 0 Introduction/abstract 1 The background 2 The main idea of retro-causal interpretations of quantum mechanics 3 Backward causation and causal loops: the complications 4 Arguments for the impossibility of backward causation and causal loops 5 The block universe, time, backward causation and causal loops 6 On prediction and explanation in indeterministic retro-causal interpretations of quantum mechanics 7 Bohmian Mechanics ________________________ * Forthcoming ”, in C.
    [Show full text]
  • Time Travel.Pptx
    IS TIME TRAVEL POSSIBLE? ALISON FERNANDES TRINITY COLLEGE DUBLIN 2019 IS TIME TRAVEL POSSIBLE? 1. What is time travel? IS TIME TRAVEL POSSIBLE? 1. What is time travel? 2. Is time travel conceptually possible? IS TIME TRAVEL POSSIBLE? 1. What is time travel? 2. Is time travel conceptually possible? • Is time travel compatible with the nature of time? IS TIME TRAVEL POSSIBLE? 1. What is time travel? 2. Is time travel conceptually possible? • Is time travel compatible with the nature of time? • Does time travel lead to paradoxes? IS TIME TRAVEL POSSIBLE? 1. What is time travel? 2. Is time travel conceptually possible? • Is time travel compatible with the nature of time? • Does time travel lead to paradoxes? 3. Is time travel physically possible? IS TIME TRAVEL POSSIBLE? 1. What is time travel? 2. Is time travel conceptually possible? • Is time travel compatible with the nature of time? • Does time travel lead to paradoxes? 3. Is time travel physically possible? WHAT IS TIME TRAVEL? • Is it changing your temporal location as time goes on? WHAT IS TIME TRAVEL? • Is it changing your temporal location as time goes on? • Then time travel is prevalent and unavoidable. WHAT IS TIME TRAVEL? • A ‘discrepancy between time and time’ (Lewis) • A journey where are a different amount of time passes for the traveller (their ‘personal time’), and for those in the surrounds (‘external time’). • Not just that one’s experience of time changes, but all the processes we take to measure time. • https://www.youtube.com/watch?v=M0qR7BiIWJE WHAT IS TIME TRAVEL? • The ‘distance’ between two points can be different, depending on the path you take.
    [Show full text]
  • Emergence of Causality from the Geometry of Spacetimes
    GRAU DE MATEMATIQUES` Treball final de grau Emergence of Causality from the Geometry of Spacetimes Autor: Roberto Forbicia Le´on Directora: Dra. Joana Cirici Realitzat a: Departament de Matem`atiques i Inform`atica Barcelona, 21 de Juny de 2020 Abstract In this work, we study how the notion of causality emerges as a natural feature of the geometry of spacetimes. We present a description of the causal structure by means of the causality relations and we investigate on some of the different causal properties that spacetimes can have, thereby introducing the so-called causal ladder. We pay special attention to the link between causality and topology, and further develop this idea by offering an overview of some spacetime topologies in which the natural connection between the two structures is enhanced. Resum En aquest treball s'estudia com la noci´ode causalitat sorgeix com a caracter´ıstica natural de la geometria dels espaitemps. S'hi presenta una descripci´ode l'estructura causal a trav´es de les relacions de causalitat i s'investiguen les diferents propietats causals que poden tenir els espaitemps, tot introduint l'anomenada escala causal. Es posa especial atenci´oa la con- nexi´oentre causalitat i topologia, i en particular s'ofereix un resum d'algunes topologies de l'espaitemps en qu`eaquesta connexi´o´esencara m´es evident. 2020 Mathematics Subject Classification. 83C05,58A05,53C50 Acknowledgements First and foremost, I would like to thank Dr. Joana Cirici for her guidance, advice and valuable suggestions. I would also like to thank my friends for having been willing to listen to me talk about spacetime geometry.
    [Show full text]
  • A New Time-Machine Model with Compact Vacuum Core
    A new time-machine model with compact vacuum core Amos Ori Department of Physics, Technion—Israel Institute of Technology, Haifa, 32000, Israel (September 20, 2018) Abstract We present a class of curved-spacetime vacuum solutions which develope closed timelike curves at some particular moment. We then use these vacuum solutions to construct a time-machine model. The causality violation occurs inside an empty torus, which constitutes the time-machine core. The matter field surrounding this empty torus satisfies the weak, dominant, and strong en- ergy conditions. The model is regular, asymptotically-flat, and topologically- trivial. Stability remains the main open question. The problem of time-machine formation is one of the outstanding open questions in spacetime physics. Time machines are spacetime configurations including closed timelike curves (CTCs), allowing physical observes to return to their own past. In the presence of a time machine, our usual notion of causality does not hold. The main question is: Do the laws of nature allow, in principle, the creation of a time machine from ”normal” initial conditions? (By ”normal” I mean, in particular, initial state with no CTCs.) Several types of time-machine models were explored so far. The early proposals include Godel’s rotating-dust cosmological model [1] and Tipler’s rotating-string solution [2]. More modern proposals include the wormhole model by Moris, Thorne and Yurtsever [3], and Gott’s solution [4] of two infinitely-long cosmic strings. Ori [5] later presented a time-machine arXiv:gr-qc/0503077v1 17 Mar 2005 model which is asymptotically-flat and topologically-trivial. Later Alcubierre introduced the warp-drive concept [6], which may also lead to CTCs.
    [Show full text]
  • On the Dynamics of Cosmological Singularity Theo- Rems by Vaibhav Kalvakota August 25, 2020
    On the dynamics of Cosmological Singularity Theo- rems By Vaibhav Kalvakota August 25, 2020 ABSTRACT Since 1955, a lot of progress has been made in the field of Cosmology. More specifi- cally, the idea of Singularities rose into Cosmology deeply with the introduction of the Raychaudari-Komar Singularity theorem. This was a great discovery, because although it only considered fluid-matter flow, it eventually led into the discovery of the importance of the Energy-Momentum density tensor in modelling the behaviour of geodesic incom- pleteness. The next immediate achievement was the 1965 Penrose theorem. Taking con- sideration of the modelling of the theta expansion already provided by the Raychaudari theorem and the importance of Cauchy Hypersurface relations to Space-time, Sir Penrose elegantly showed how you could understand the structure of Singularities by considering null geodesics all satisfying the expansion. Sir Stephen Hawking further improvised the theorem, by considering the importance of closed trapped surfaces. He eventually showed how geodesic incompleteness arises merely by satisfying three conditions: one, there being a closed chronal hypersurface, a set of light rays re-converging or there existing a closed trapped surface. In this document, we will consider an analytical overview of the Hawking-Penrose theorem and its implications in Cosmology and the modelling of a \realistic" Cosmology model. Further, we will also side by side see how these theorems have very huge implications in Cosmology. We will also consider the Causal structures of these models. We will consider also how the Hawking-Penrose theorem extends the original Penrose theorem and models the Time Reversal Singularity of a non-static accelerating Universe.
    [Show full text]
  • Time Traveling Paradoxes Zan Bhullar Florida International University
    Acta Cogitata: An Undergraduate Journal in Philosophy Volume 5 Article 5 2018 A Practical Understanding: Time Traveling Paradoxes Zan Bhullar Florida International University Follow this and additional works at: http://commons.emich.edu/ac Part of the Philosophy Commons Recommended Citation Bhullar, Zan (2018) "A Practical Understanding: Time Traveling Paradoxes," Acta Cogitata: An Undergraduate Journal in Philosophy: Vol. 5 , Article 5. Available at: http://commons.emich.edu/ac/vol5/iss1/5 This Article is brought to you for free and open access by the Department of History and Philosophy at DigitalCommons@EMU. It has been accepted for inclusion in Acta Cogitata: An Undergraduate Journal in Philosophy by an authorized editor of DigitalCommons@EMU. For more information, please contact [email protected]. A Practical Understanding: Time Traveling Paradoxes Zan Bhullar, Florida International University Abstract The possibility for time travel inadvertently brings forth several paradoxes. Yet, despite this fact there are still those who defend its plausibility and claim that time travel remains possible. I, however, stand firm that time travel could not be possible due to the absurdities it would allow. Of the many paradoxes time travel permits, the ones I shall be demonstrating, are the causal-loop paradox, auto-infanticide or grandfather paradox, and the multiverse theory. I will begin with the causal-loop paradox, which insists that my older-self could time travel to my present and teach me how to build a time machine, dismissing the need for me to learn how to build it. Following this, I address the grandfather paradox. This argues that I could go back in time and kill my grandfather, which would entail that I never existed, yet I was still able to kill him.
    [Show full text]
  • Causal and Relativistic Loopholes in a Delayed-Choice Quantum Eraser
    Causal and relativistic loopholes in a Delayed-Choice Quantum Eraser experiment Remote sensing & mapping quantum property fluctuations of past, present & future hypersurfaces of spacetime may be possible without violation of causality by a modified DCQE device experiment By Gergely A.Nagy, Rev. 1.3, 2011 Submitted 04.01.2011 App. ‘A’ w/MDHW Theory pre-published by Idokep.hu Ltd., R&D, Science columns, article no. 984. Article Status – Manuscript. Awaiting approval/review for itl. publication (as of 04.01., 2011) Experimental status – Quantum-optics lab w/observatory needed for experimental testing Hungary Sc.Field Quantum Optics Topic Space-time quantum-interaction 1 Causal and relativistic loopholes in a Delayed-Choice Quantum Eraser experiment Remote sensing & mapping quantum property fluctuations of past, present & future hypersurfaces of spacetime may be possible without violation of causality by a modified DCQE device experiment By Gergely A. Nagy, Rev 1.3, 2011 Abstract In this paper we show that the ‘Delayed Choice Quantum Eraser Experiment’, 1st performed by Yoon-Ho Kim, R. Yu, S.P. Kulik, Y.H. Shih, designed by Marlan O. Scully & Drühl in 1982-1999, features topological property that may prohibit, by principle, the extraction of future-related or real-time information from the detection of the signal particle on the delayed choice of its entangled idler twin(s). We show that such property can be removed, and quantum-level information from certain hypersurfaces of spacetime may be collected in the present, without resulting in any paradox or violation of causality. We point out, that such phenomenon could also be used to realize non-retrocausal, superluminar (FTL) communication as well.
    [Show full text]
  • Causal Loops
    Causal Loops Logically Consistent Correlations, Time Travel, and Computation Doctoral Dissertation submitted to the Faculty of Informatics of the Università della Svizzera italiana in partial fulfillment of the requirements for the degree of Doctor of Philosophy presented by Ämin Baumeler under the supervision of Prof. Stefan Wolf March 2017 Dissertation Committee Prof. Antonio Carzaniga Università della Svizzera italiana, Switzerland Prof. Robert Soulé Università della Svizzera italiana, Switzerland Prof. Caslavˇ Brukner Universität Wien, Austria Prof. William K. Wootters Williams College, USA Dissertation accepted on 30 March 2017 Prof. Stefan Wolf Research Advisor Università della Svizzera italiana, Switzerland Prof. Walter Binder and Prof. Michael Bronstein PhD Program Director i I certify that except where due acknowledgement has been given, the work pre- sented in this thesis is that of the author alone; the work has not been submitted previ- ously, in whole or in part, to qualify for any other academic award; and the content of the thesis is the result of work which has been carried out since the official commence- ment date of the approved research program. Ämin Baumeler Lugano, 30 March 2017 ii To this dedication iii iv To my parents, Hanspeter and Zohra v In some remote corner of the sprawling universe, twinkling among the countless solar systems, there was once a star on which some clever animals invented knowledge. It was the most arrogant, most mendacious minute in world history, but it was only a minute. After nature caught its breath a little, the star froze, and the clever animals had to die. And it was time, too: for although they boasted of how much they had come to know, in the end they realized they had gotten it all wrong.
    [Show full text]
  • Causal Loops in Time Travel
    Causal Loops in Time Travel Nicolae Sfetcu February 9, 2019 Sfetcu, Nicolae, " Causal loops in time travels", SetThings (February 9, 2019), MultiMedia Publishing (ed.), DOI: 10.13140/RG.2.2.17802.31680, ISBN: 978-606-033-195-7, URL = https://www.telework.ro/en/e-books/causal-loops-in-time-travel/ Email: [email protected] This article is licensed under a Creative Commons Attribution-NoDerivatives 4.0 International. To view a copy of this license, visit http://creativecommons.org/licenses/by-nd/4.0/. A translation of: Sfetcu, Nicolae, " Buclele cauzale în călătoria în timp", SetThings (2 februarie 2018), MultiMedia Publishing (ed.), DOI: 10.13140/RG.2.2.21222.52802, ISBN 978-606-033-148-3, URL = https://www.telework.ro/ro/e-books/buclele-cauzale-calatoria-timp/ Nicolae Sfetcu: Causal Loops in Time Travel Abstract In this paper I analyze the possibility of time traveling based on several specialized works, including those of Nicholas J.J. Smith ("Time Travel", The Stanford Encyclopedia of Philosophy”), (Smith 2016) William Grey (”Troubles with Time Travel”), (Grey 1999) Ulrich Meyer (”Explaining causal loops”), (Meyer 2012) Simon Keller and Michael Nelson (”Presentists should believe in time-travel”), (Keller and Nelson 2010) Frank Arntzenius and Tim Maudlin ("Time Travel and Modern Physics"), (Arntzenius and Maudlin 2013) and David Lewis (“The Paradoxes of Time Travel”). (Lewis 1976) The paper begins with an introduction in which I make a short presentation of the time travel, and continues with a history of the concept of time travel, main physical aspects of time travel, including backward time travel in general relativity and quantum physics, and time travel in the future, then a presentation of the grandfather paradox that is approached in almost all specialized works, followed by a section dedicated to the philosophy of time travel, and a section in which I analyze causal loops for time travel.
    [Show full text]
  • Paradoxes of Time Travel
    Paradoxes of Time Travel Paradoxes of Time Travel Ryan Wasserman 1 3 Great Clarendon Street, Oxford, OX2 6DP, United Kingdom Oxford University Press is a department of the University of Oxford. It furthers the University’s objective of excellence in research, scholarship, and education by publishing worldwide. Oxford is a registered trade mark of Oxford University Press in the UK and in certain other countries © Ryan Wasserman 2018 The moral rights of the author have been asserted First Edition published in 2018 Impression: 1 All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, without the prior permission in writing of Oxford University Press, or as expressly permitted by law, by licence or under terms agreed with the appropriate reprographics rights organization. Enquiries concerning reproduction outside the scope of the above should be sent to the Rights Department, Oxford University Press, at the address above You must not circulate this work in any other form and you must impose this same condition on any acquirer Published in the United States of America by Oxford University Press 198 Madison Avenue, New York, NY 10016, United States of America British Library Cataloguing in Publication Data Data available Library of Congress Control Number: 2017943946 ISBN 978–0–19–879333–5 Printed and bound by CPI Group (UK) Ltd, Croydon, CR0 4YY Links to third party websites are provided by Oxford in good faith and for information only. Oxford disclaims any responsibility for the materials contained in any third party website referenced in this work.
    [Show full text]