On Spacetime Quantum Duality and Bounce Cosmology of a Dual Universe

Total Page:16

File Type:pdf, Size:1020Kb

On Spacetime Quantum Duality and Bounce Cosmology of a Dual Universe Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: 29 April 2021 doi:10.20944/preprints202005.0250.v9 On Spacetime Quantum Duality and Bounce Cosmology of a Dual Universe Mohammed. B. Al-Fadhli1* 1College of Science, University of Lincoln, Lincoln, LN6 7TS, UK. *Correspondence: [email protected]; [email protected] Abstract: The recent Planck Legacy release confirmed the existence of an enhanced lensing amplitude in the cosmic microwave background (CMB) power spectra, which endorses the positive curvature of the early Universe with a confidence level exceeding 99%. In this study, the pre-existing curvature is incorporated to extend the field equations where the derived wave function of the Universe is utilized to model Universe evolution with reference to the scale factor of the early Universe and its radius of curvature upon the emission of the CMB. The wave function reveals both positive and negative solutions, implying that matter and antimatter of early Universe plasma evolve in opposite directions as distinct Universe sides. The wave function indicates that a nascent hyperbolic expansion is followed by a first phase of decelerating expansion away from early plasma during the first ~10 Gyr, and then, a second phase of accelerating expansion in reverse directions, whereby both Universe sides free-fall towards each other under gravitational acceleration. Simulations of the predicted conformal curvature evolution demonstrate the fast orbital speed of outer stars owing to the external fields exerted on galaxies as they travel through conformally curved space-time. Finally, the wave function predicts an eventual time-reversal phase comprising rapid spatial contraction that culminates in a Big Crunch, signalling a cyclic Universe. These findings reveal that early plasma could have separated and evolved into distinct sides that collectively and geometrically influencing the Universe evolution, physically explanting the effects attributed to dark matter and energy. Keywords: Accelerated Expansion; Fast orbital speed of outer stars; Duality; Antimatter. 1. INTRODUCTION Bounce cosmology provides an alternative view The Planck Legacy PL18 release confirmed the of the Universe, in which our Universe expanded existence of an enhanced lensing amplitude in the from a hot and very dense state of a previous collap- power spectra of the CMB [5]. Notably, it is more than sed Universe [1]. This cosmology is free from the that estimated by the lambda cold dark matter model singularity problem and offers a clearer view of the (ΛCDM), which endorses the positive curvature of early Universe. However, the null-energy condition the early Universe with a confidence level more than is generally violated by the conjectured bounce of re- 99% [5,6]. Besides, the observed gravitational lensing expansion in several modified gravity theories [2]. by substructures of several galaxy clusters is an order Alternatively, this bounce could be realized through other scenarios, such as the phenomenon of plasma of magnitude higher than that estimated by the drift in the presence of electromagnetic fields. In this ΛCDM [7,8]. This endorses a curved Universe despite sense, matter and antimatter in early Universe of the present/local space-time flatness. plasma could be separated by primordial electro- The presumed concepts of dark energy, dark magnetic fields upon the emission of the cosmic matter, and antimatter early elimination are being microwave background (CMB), thereby evolving in challenged by new observations and measurements. opposite directions owing to their opposite spin and Riess in 2020 found the Universe expansion is faster charge. The plasma separation until and under the than the ΛCDM estimates [9] while Ryskin showed right conditions would allow the collapsed state to that vacuum energy cannot be causing the acceler- achieve thermal equilibrium while the gravitational ated expansion [10]. In addition, external field effect contributions of early Universe plasma boundary that influence galactic rotation curves were detected could realize a singularity-free paradigm. Signs of the at up to 8σ to 11σ, challenging traditional dark matter plasma separation or a significant predominant event concepts [11]. Additionally, advanced measurements might be observed as associated noise surrounding of the fine structure of hydrogen and antihydrogen the measured gravitational waves [3]. Additionally, atoms were found to be consistent with Quantum the magnetic fields that presently pervade the Electrodynamics Theory predictions at a margin of Universe at all probed scales favour a primordial 2%, including the Lamb-shift feature, undermining origin of this kind [4]. elimination assumptions [12]. 1 © 2021 by the author(s). Distributed under a Creative Commons CC BY license. Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: 29 April 2021 doi:10.20944/preprints202005.0250.v9 Accordingly, a closed early Universe model is is consistent with Mach’s principle, the reliance of the considered in this study to approach the problems of small structure on the larger structure. Schrödinger in accelerated expansion and fast orbital speed of stars 1925 pointed to the reliance of 퐺푡 on the distribution from a new perspective. The closed finite Universe of Universe’s masses and the Universe’s radius while can provide an agreement with the CMB anisotropy Dirac in 1938 proposed its correlation to the age of the observations [13] and could explain the quantum Universe [16]. The evolution in 퐺푡 can be endorsed entanglement, where the total Universe energy is by the measured gradual evolution in the fine- finite; thus, cosmic conservation preserves the total structure ‘constant’ [17–19], which can reveal that the spin of a pair of particles regardless of their locations presumed fundamental constants may rely on other [14]. The pre-existing curvature is considered to properties of the Universe. extend the field equations and the evolution of the On the other hand, 퐸퐷 is in terms of energy Universe from early plasma is modelled by utilising density and represents the continuum’s resistance to the Universe wave function. This paper is organised deformation [20]. Eq. (1) shows 퐸퐷 is proportional to as follows. Section 2 presents the extended field the fourth-power of the speed of light, which, in turn equations. Sections 3 and 4 discuss the Universe directly proportional to the frequency; in accordance model, its evolution, and its minimal radius while with the frequency cut-off predictions of the vacuum Section 5 presents the spiral galaxy simulation under energy density in the Quantum Field Theory [21]; external fields. Finally, section 6 concludes this work thus, 퐸퐷 can characterize space-time continuum’s and suggests future works. resistance to curvature and could represent vacuum energy density. Further, the inverse proportionality 2. Extended Field Equations for the Curved in Eq. (1) could explain galaxy formation without Early Universe involving dark matter where 퐺푡 was larger in value The recent PL18 release revealed a positive early at the early Universe. Galaxy formation has been Universe curvature, that is, is evidence of a pre- simulated using modified Newtonian gravity [22]. existing or background curvature. To consider this By incorporating the pre-existing/background pre-existing curvature and its evolution over cosmic curvature as a function of cosmic time and complying with the law of energy conservation, the Einstein– time, 푡, a modulus of spacetime deformation, 퐸퐷, is utilized. Spacetime is regarded as a continuum with Hilbert action can be extended to 퐸퐷 푅 a dual quantum nature, that it curves as waves 4 푆 = ∫ [ + ℒ푀] √−푔 푑 푥 (2) according to General Relativity while fluxing as 2 ℛ quantum energy particles; where the latter is justified where 푅 and ℛ are the Ricci and the pre-existing because the energy flux from early Universe plasma scalar curvatures respectively, ℒ푀 is the Lagrangian into space at the speed of light creating a ‘spacetime density and 푔 is the determinant of the metric 푔푢푣. continuum’ or ‘vacuum energy’. This concept of The indistinctive variation in the action yields spacetime quantum duality can be corroborated by 훿푅 −푔 훿ℛ −푔푅 훿 −푔푅 퐸퐷 √ √ √ 4 [ ( − 2 + )] 푑 푥 recent findings regarding the polarization of light 2 ℛ ℛ ℛ 훿푆 = ∫ 푅 from the CMB, which indicated the possible existence (3) 4 of an exotic substance throughout space that causes + [훿ℒ푀√−푔 + 훿√−푔ℒ푀] 푑 푥 ( ) these measured polarizations [15]. By using the trace- reversed Einstein field equations, the modulus of the By differentiating the determinant according to the 휇휈 Jacobi's formula as 훿√−푔 = −√−푔 푔휇휈훿푔 /2 where continuum, 퐸퐷 = (stress/strain), is expressed as the variation in the metric times the inverse metric, 4 푇 − 푇푔 /2 c 휇 휇휈 휇휈 푔휇휈 푔 = 훿 , yields 푔휇휈 훿푔 + 푔 훿푔휇휈 = 0, while the 퐸퐷 = = 2 (1) 휇휈 휈 휇휈 휇휈 푅휇휈/ℛ 8π퐺푡푟푡 휇휈 variation in the scalar curvature, 푅 = 푅휇휈푔 , is 훿푅 = 휇휈 푢푣 where the stress is signified by the stress-energy 푅휇휈훿푔 + 푔 훿푅휇휈 [23]. Thus, Eq. (3) is expressed as tensor, 푇휇휈, of trace, 푇, while the strain is signified by 퐸퐷 [ (푅 훿푔휇휈 + 푔휇휈훿푅 )] √−푔 푑4푥 2ℛ 휇휈 휇휈 the Ricci curvature tensor, 푅휇휈 , as the change in 2 퐸 푅 curvature divided by ℛ = 1/푟푡 , the scalar of the − [ 퐷 (ℛ 훿푔휇휈 + 푔휇휈훿ℛ )] −푔 푑4푥 2 휇휈 휇휈 √ pre-existing curvature, 푟 is the Universe’s radius of 2ℛ 푡 훿푆 = ∫ (4) 퐸퐷푅 휇휈 4 curvature and 푔휇휈 is the metric tensor. According to − [ 푔 훿푔 ] √−푔 푑 푥 4ℛ 휇휈 the theory of elasticity, 퐸퐷 is a constant; therefore, ℒ푀 Eq. (1) shows an inverse proportionality between the + [훿ℒ − 푔 훿푔휇휈] √−푔 푑4푥 푀 2 휇휈 ( ) gravitational ‘constant‘, 퐺푡, and 푟푡, where 퐺푡 follows the inverse square law with respect to the Universe’s The lambda/pressure is not considered, which could radius as a function of cosmic time. This relationship be implicitly incorporated into stress-energy tensors. 2 Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: 29 April 2021 doi:10.20944/preprints202005.0250.v9 By considering the first boundary term in Eq.
Recommended publications
  • Quantum Vacuum Energy Density and Unifying Perspectives Between Gravity and Quantum Behaviour of Matter
    Annales de la Fondation Louis de Broglie, Volume 42, numéro 2, 2017 251 Quantum vacuum energy density and unifying perspectives between gravity and quantum behaviour of matter Davide Fiscalettia, Amrit Sorlib aSpaceLife Institute, S. Lorenzo in Campo (PU), Italy corresponding author, email: [email protected] bSpaceLife Institute, S. Lorenzo in Campo (PU), Italy Foundations of Physics Institute, Idrija, Slovenia email: [email protected] ABSTRACT. A model of a three-dimensional quantum vacuum based on Planck energy density as a universal property of a granular space is suggested. This model introduces the possibility to interpret gravity and the quantum behaviour of matter as two different aspects of the same origin. The change of the quantum vacuum energy density can be considered as the fundamental medium which determines a bridge between gravity and the quantum behaviour, leading to new interest- ing perspectives about the problem of unifying gravity with quantum theory. PACS numbers: 04. ; 04.20-q ; 04.50.Kd ; 04.60.-m. Key words: general relativity, three-dimensional space, quantum vac- uum energy density, quantum mechanics, generalized Klein-Gordon equation for the quantum vacuum energy density, generalized Dirac equation for the quantum vacuum energy density. 1 Introduction The standard interpretation of phenomena in gravitational fields is in terms of a fundamentally curved space-time. However, this approach leads to well known problems if one aims to find a unifying picture which takes into account some basic aspects of the quantum theory. For this reason, several authors advocated different ways in order to treat gravitational interaction, in which the space-time manifold can be considered as an emergence of the deepest processes situated at the fundamental level of quantum gravity.
    [Show full text]
  • The Reionization of Cosmic Hydrogen by the First Galaxies Abstract 1
    David Goodstein’s Cosmology Book The Reionization of Cosmic Hydrogen by the First Galaxies Abraham Loeb Department of Astronomy, Harvard University, 60 Garden St., Cambridge MA, 02138 Abstract Cosmology is by now a mature experimental science. We are privileged to live at a time when the story of genesis (how the Universe started and developed) can be critically explored by direct observations. Looking deep into the Universe through powerful telescopes, we can see images of the Universe when it was younger because of the finite time it takes light to travel to us from distant sources. Existing data sets include an image of the Universe when it was 0.4 million years old (in the form of the cosmic microwave background), as well as images of individual galaxies when the Universe was older than a billion years. But there is a serious challenge: in between these two epochs was a period when the Universe was dark, stars had not yet formed, and the cosmic microwave background no longer traced the distribution of matter. And this is precisely the most interesting period, when the primordial soup evolved into the rich zoo of objects we now see. The observers are moving ahead along several fronts. The first involves the construction of large infrared telescopes on the ground and in space, that will provide us with new photos of the first galaxies. Current plans include ground-based telescopes which are 24-42 meter in diameter, and NASA’s successor to the Hubble Space Telescope, called the James Webb Space Telescope. In addition, several observational groups around the globe are constructing radio arrays that will be capable of mapping the three-dimensional distribution of cosmic hydrogen in the infant Universe.
    [Show full text]
  • The Age of the Universe, the Hubble Constant, the Accelerated Expansion and the Hubble Effect
    The age of the universe, the Hubble constant, the accelerated expansion and the Hubble effect Domingos Soares∗ Departamento de F´ısica,ICEx, UFMG | C.P. 702 30123-970, Belo Horizonte | Brazil October 25, 2018 Abstract The idea of an accelerating universe comes almost simultaneously with the determination of Hubble's constant by one of the Hubble Space Tele- scope Key Projects. The age of the universe dilemma is probably the link between these two issues. In an appendix, I claim that \Hubble's law" might yet to be investigated for its ultimate cause, and suggest the \Hubble effect” as the searched candidate. 1 The age dilemma The age of the universe is calculated by two different ways. Firstly, a lower limit is given by the age of the presumably oldest objects in the Milky Way, e.g., globular clusters. Their ages are calculated with the aid of stellar evolu- tion models which yield 14 Gyr and 10% uncertainty. These are fairly confident figures since the basics of stellar evolution are quite solid. Secondly, a cosmo- logical age based on the Standard Cosmology Model derived from the Theory of General Relativity. The three basic models of relativistic cosmology are given by the Friedmann's solutions of Einstein's field equations. The models are char- acterized by a decelerated expansion from a spatial singularity at cosmic time t = 0, and whose magnitude is quantified by the density parameter Ω◦, the present ratio of the mass density in the universe to the so-called critical mass arXiv:0908.1864v8 [physics.gen-ph] 28 Jul 2015 density.
    [Show full text]
  • Pre-Big Bang, Space-Time Structure, Asymptotic Universe
    EPJ Web of Conferences 71, 0 0 063 (2 014 ) DOI: 10.1051/epjconf/20147100063 C Owned by the authors, published by EDP Sciences, 2014 Pre-Big Bang, space-time structure, asymptotic Universe Spinorial space-time and a new approach to Friedmann-like equations Luis Gonzalez-Mestres1,a 1Megatrend Cosmology Laboratory, Megatrend University, Belgrade and Paris Goce Delceva 8, 11070 Novi Beograd, Serbia Abstract. Planck and other recent data in Cosmology and Particle Physics can open the way to controversial analyses concerning the early Universe and its possible ultimate origin. Alternatives to standard cosmology include pre-Big Bang approaches, new space- time geometries and new ultimate constituents of matter. Basic issues related to a possible new cosmology along these lines clearly deserve further exploration. The Planck collab- oration reports an age of the Universe t close to 13.8 Gyr and a present ratio H between relative speeds and distances at cosmic scale around 67.3 km/s/Mpc. The product of these two measured quantities is then slightly below 1 (about 0.95), while it can be exactly 1 in the absence of matter and cosmological constant in patterns based on the spinorial space- time we have considered in previous papers. In this description of space-time we first suggested in 1996-97, the cosmic time t is given by the modulus of a SU(2) spinor and the Lundmark-Lemaître-Hubble (LLH) expansion law turns out to be of purely geometric origin previous to any introduction of standard matter and relativity. Such a fundamen- tal geometry, inspired by the role of half-integer spin in Particle Physics, may reflect an equilibrium between the dynamics of the ultimate constituents of matter and the deep structure of space and time.
    [Show full text]
  • The Ups and Downs of Baryon Oscillations
    The Ups and Downs of Baryon Oscillations Eric V. Linder Physics Division, Lawrence Berkeley Laboratory, Berkeley, CA 94720 ABSTRACT Baryon acoustic oscillations, measured through the patterned distribution of galaxies or other baryon tracing objects on very large (∼> 100 Mpc) scales, offer a possible geometric probe of cosmological distances. Pluses and minuses in this approach’s leverage for understanding dark energy are discussed, as are systematic uncertainties requiring further investigation. Conclusions are that 1) BAO offer promise of a new avenue to distance measurements and further study is warranted, 2) the measurements will need to attain ∼ 1% accuracy (requiring a 10000 square degree spectroscopic survey) for their dark energy leverage to match that from supernovae, but do give complementary information at 2% accuracy. Because of the ties to the matter dominated era, BAO is not a replacement probe of dark energy, but a valuable complement. 1. Introduction This paper provides a pedagogical introduction to baryon acoustic oscillations (BAO), accessible to readers not necessarily familiar with details of large scale structure in the universe. In addition, it summarizes some of the current issues – plus and minus – with the use of BAO as a cosmological probe of the nature of dark energy. For more quantitative, arXiv:astro-ph/0507308v2 17 Jan 2006 technical discussions of these issues, see White (2005). The same year as the detection of the cosmic microwave background, the photon bath remnant from the hot, early universe, Sakharov (1965) predicted the presence of acoustic oscillations in a coupled baryonic matter distribution. In his case, baryons were coupled to cold electrons rather than hot photons; Peebles & Yu (1970) and Sunyaev & Zel’dovich (1970) pioneered the correct, hot case.
    [Show full text]
  • A Final Cure to the Tribulations of the Vacuum in Quantum Theory Joseph Jean-Claude
    A Final Cure to the Tribulations of the Vacuum in Quantum Theory Joseph Jean-Claude To cite this version: Joseph Jean-Claude. A Final Cure to the Tribulations of the Vacuum in Quantum Theory. 2019. hal-01991699 HAL Id: hal-01991699 https://hal.archives-ouvertes.fr/hal-01991699 Preprint submitted on 24 Jan 2019 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. A Final Cure to the Tribulations of the Vacuum in Quantum Theory Joseph J. JEAN-CLAUDE April 16, 2017 - Revision I (Jan-2019) © Copyright [email protected] Abstract Quantum Field Theory seems to be of late anything but unraveling, apparently shifting from crisis to crisis. Undeniably, there seems to be running, for many different reasons, a rampant discomfort with the Standard Model, an extension of QFT aiming at complementing it. Prior to the latest supersymmetry upset, what has been known as the “vacuum castastrophe” or the “cosmological constant problem” resoundingly shook the very foundations of the Theory. Effectively the enormous numeric disparity between its predicted value of the vacuum energy density, an element of utmost significance in the Theory, and the measured value of this quantity from a Relativistic approach has prompted some to qualify this mishap as the biggest predictive failure of any Theory.
    [Show full text]
  • Estimating the Vacuum Energy Density E
    Estimating the Vacuum Energy Density E. Margan Estimating the Vacuum Energy Density - an Overview of Possible Scenarios Erik Margan Experimental Particle Physics Department, “Jožef Stefan” Institute, Ljubljana, Slovenia 1. Introduction There are several different indications that the vacuum energy density should be non-zero, each indication being based either on laboratory experiments or on astronomical observations. These include the Planck’s radiation law, the spontaneous emission of a photon by a particle in an excited state, the Casimir’s effect, the van der Waals’ bonds, the Lamb’s shift, the Davies–Unruh’s effect, the measurements of the apparent luminosity against the spectral red shift of supernovae type Ia, and more. However, attempts to find the way to measure or to calculate the value of the vacuum energy density have all either failed or produced results incompatible with observations or other confirmed theoretical results. Some of those results are theoretically implausible because of certain unrealistic assumptions on which the calculation model is based. And some theoretical results are in conflict with observations, the conflict itself being caused by certain questionable hypotheses on which the theory is based. And the best experimental evidence (the Casimir’s effect) is based on the measurement of the difference of energy density within and outside of the measuring apparatus, thus preventing in principle any numerical assessment of the actual energy density. This article presents an overview of the most important estimation methods. - 1 - Estimating the Vacuum Energy Density E. Margan - 2 - Estimating the Vacuum Energy Density E. Margan 2. Planck’s Theoretical Vacuum Energy Density The energy density of the quantum vacuum fluctuations has been estimated shortly after Max Planck (1900-1901) [1] published his findings of the spectral distribution of the ideal thermodynamic black body radiation and its dependence on the temperature of the radiating black body.
    [Show full text]
  • AST4220: Cosmology I
    AST4220: Cosmology I Øystein Elgarøy 2 Contents 1 Cosmological models 1 1.1 Special relativity: space and time as a unity . 1 1.2 Curvedspacetime......................... 3 1.3 Curved spaces: the surface of a sphere . 4 1.4 The Robertson-Walker line element . 6 1.5 Redshifts and cosmological distances . 9 1.5.1 Thecosmicredshift . 9 1.5.2 Properdistance. 11 1.5.3 The luminosity distance . 13 1.5.4 The angular diameter distance . 14 1.5.5 The comoving coordinate r ............... 15 1.6 TheFriedmannequations . 15 1.6.1 Timetomemorize! . 20 1.7 Equationsofstate ........................ 21 1.7.1 Dust: non-relativistic matter . 21 1.7.2 Radiation: relativistic matter . 22 1.8 The evolution of the energy density . 22 1.9 The cosmological constant . 24 1.10 Some classic cosmological models . 26 1.10.1 Spatially flat, dust- or radiation-only models . 27 1.10.2 Spatially flat, empty universe with a cosmological con- stant............................ 29 1.10.3 Open and closed dust models with no cosmological constant.......................... 31 1.10.4 Models with more than one component . 34 1.10.5 Models with matter and radiation . 35 1.10.6 TheflatΛCDMmodel. 37 1.10.7 Models with matter, curvature and a cosmological con- stant............................ 40 1.11Horizons.............................. 42 1.11.1 Theeventhorizon . 44 1.11.2 Theparticlehorizon . 45 1.11.3 Examples ......................... 46 I II CONTENTS 1.12 The Steady State model . 48 1.13 Some observable quantities and how to calculate them . 50 1.14 Closingcomments . 52 1.15Exercises ............................. 53 2 The early, hot universe 61 2.1 Radiation temperature in the early universe .
    [Show full text]
  • Hubble's Diagram and Cosmic Expansion
    Hubble’s diagram and cosmic expansion Robert P. Kirshner* Harvard–Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 Contributed by Robert P. Kirshner, October 21, 2003 Edwin Hubble’s classic article on the expanding universe appeared in PNAS in 1929 [Hubble, E. P. (1929) Proc. Natl. Acad. Sci. USA 15, 168–173]. The chief result, that a galaxy’s distance is proportional to its redshift, is so well known and so deeply embedded into the language of astronomy through the Hubble diagram, the Hubble constant, Hubble’s Law, and the Hubble time, that the article itself is rarely referenced. Even though Hubble’s distances have a large systematic error, Hubble’s velocities come chiefly from Vesto Melvin Slipher, and the interpretation in terms of the de Sitter effect is out of the mainstream of modern cosmology, this article opened the way to investigation of the expanding, evolving, and accelerating universe that engages today’s burgeoning field of cosmology. he publication of Edwin Hub- ble’s 1929 article ‘‘A relation between distance and radial T velocity among extra-galactic nebulae’’ marked a turning point in un- derstanding the universe. In this brief report, Hubble laid out the evidence for one of the great discoveries in 20th cen- tury science: the expanding universe. Hubble showed that galaxies recede from us in all directions and more dis- tant ones recede more rapidly in pro- portion to their distance. His graph of velocity against distance (Fig. 1) is the original Hubble diagram; the equation that describes the linear fit, velocity ϭ ϫ Ho distance, is Hubble’s Law; the slope of that line is the Hubble con- ͞ stant, Ho; and 1 Ho is the Hubble time.
    [Show full text]
  • New Varying Speed of Light Theories
    New varying speed of light theories Jo˜ao Magueijo The Blackett Laboratory,Imperial College of Science, Technology and Medicine South Kensington, London SW7 2BZ, UK ABSTRACT We review recent work on the possibility of a varying speed of light (VSL). We start by discussing the physical meaning of a varying c, dispelling the myth that the constancy of c is a matter of logical consistency. We then summarize the main VSL mechanisms proposed so far: hard breaking of Lorentz invariance; bimetric theories (where the speeds of gravity and light are not the same); locally Lorentz invariant VSL theories; theories exhibiting a color dependent speed of light; varying c induced by extra dimensions (e.g. in the brane-world scenario); and field theories where VSL results from vacuum polarization or CPT violation. We show how VSL scenarios may solve the cosmological problems usually tackled by inflation, and also how they may produce a scale-invariant spectrum of Gaussian fluctuations, capable of explaining the WMAP data. We then review the connection between VSL and theories of quantum gravity, showing how “doubly special” relativity has emerged as a VSL effective model of quantum space-time, with observational implications for ultra high energy cosmic rays and gamma ray bursts. Some recent work on the physics of “black” holes and other compact objects in VSL theories is also described, highlighting phenomena associated with spatial (as opposed to temporal) variations in c. Finally we describe the observational status of the theory. The evidence is slim – redshift dependence in alpha, ultra high energy cosmic rays, and (to a much lesser extent) the acceleration of the universe and the WMAP data.
    [Show full text]
  • Time in Cosmology
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Philsci-Archive Time in Cosmology Craig Callender∗ C. D. McCoyy 21 August 2017 Readers familiar with the workhorse of cosmology, the hot big bang model, may think that cosmology raises little of interest about time. As cosmological models are just relativistic spacetimes, time is under- stood just as it is in relativity theory, and all cosmology adds is a few bells and whistles such as inflation and the big bang and no more. The aim of this chapter is to show that this opinion is not completely right...and may well be dead wrong. In our survey, we show how the hot big bang model invites deep questions about the nature of time, how inflationary cosmology has led to interesting new perspectives on time, and how cosmological speculation continues to entertain dramatically different models of time altogether. Together these issues indicate that the philosopher interested in the nature of time would do well to know a little about modern cosmology. Different claims about time have long been at the heart of cosmology. Ancient creation myths disagree over whether time is finite or infinite, linear or circular. This speculation led to Kant complaining in his famous antinomies that metaphysical reasoning about the nature of time leads to a “euthanasia of reason”. But neither Kant’s worry nor cosmology becoming a modern science succeeded in ending the speculation. Einstein’s first model of the universe portrays a temporally infinite universe, where space is edgeless and its material contents unchanging.
    [Show full text]
  • Path Integral in Quantum Field Theory Alexander Belyaev (Course Based on Lectures by Steven King) Contents
    Path Integral in Quantum Field Theory Alexander Belyaev (course based on Lectures by Steven King) Contents 1 Preliminaries 5 1.1 Review of Classical Mechanics of Finite System . 5 1.2 Review of Non-Relativistic Quantum Mechanics . 7 1.3 Relativistic Quantum Mechanics . 14 1.3.1 Relativistic Conventions and Notation . 14 1.3.2 TheKlein-GordonEquation . 15 1.4 ProblemsSet1 ........................... 18 2 The Klein-Gordon Field 19 2.1 Introduction............................. 19 2.2 ClassicalScalarFieldTheory . 20 2.3 QuantumScalarFieldTheory . 28 2.4 ProblemsSet2 ........................... 35 3 Interacting Klein-Gordon Fields 37 3.1 Introduction............................. 37 3.2 PerturbationandScatteringTheory. 37 3.3 TheInteractionHamiltonian. 43 3.4 Example: K π+π− ....................... 45 S → 3.5 Wick’s Theorem, Feynman Propagator, Feynman Diagrams . .. 47 3.6 TheLSZReductionFormula. 52 3.7 ProblemsSet3 ........................... 58 4 Transition Rates and Cross-Sections 61 4.1 TransitionRates .......................... 61 4.2 TheNumberofFinalStates . 63 4.3 Lorentz Invariant Phase Space (LIPS) . 63 4.4 CrossSections............................ 64 4.5 Two-bodyScattering . 65 4.6 DecayRates............................. 66 4.7 OpticalTheorem .......................... 66 4.8 ProblemsSet4 ........................... 68 1 2 CONTENTS 5 Path Integrals in Quantum Mechanics 69 5.1 Introduction............................. 69 5.2 The Point to Point Transition Amplitude . 70 5.3 ImaginaryTime........................... 74 5.4 Transition Amplitudes With an External Driving Force . ... 77 5.5 Expectation Values of Heisenberg Position Operators . .... 81 5.6 Appendix .............................. 83 5.6.1 GaussianIntegration . 83 5.6.2 Functionals ......................... 85 5.7 ProblemsSet5 ........................... 87 6 Path Integral Quantisation of the Klein-Gordon Field 89 6.1 Introduction............................. 89 6.2 TheFeynmanPropagator(again) . 91 6.3 Green’s Functions in Free Field Theory .
    [Show full text]