1 Towards a Monster Group Encompassing the Universe
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Flavor Moonshine
Prog. Theor. Exp. Phys. 2020, 013B03 (20 pages) DOI: 10.1093/ptep/ptz137 Flavor moonshine Shotaro Shiba Funai1,∗ Hirotaka Sugawara2,∗ 1Physics and Biology Unit, Okinawa Institute of Science and Technology (OIST), 1919-1 Tancha, Onna-son, Kunigami-gun, Okinawa 904-0495, Japan 2High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan ∗E-mail: [email protected], [email protected] Received August 30, 2019; Revised October 17, 2019; Accepted October 23, 2019; Published January 13, 2020 ................................................................................................................... The flavor moonshine hypothesis is formulated to suppose that all particle masses (leptons, quarks, Higgs, and gauge particles—more precisely, their mass ratios) are expressed as coef- ficients in the Fourier expansion of some modular forms just as, in mathematics, dimensions of representations of a certain group are expressed as coefficients in the Fourier expansion of some modular forms. The mysterious hierarchical structure of the quark and lepton masses is thus attributed to that of the Fourier coefficient matrices of certain modular forms. Our inten- tion here is not to prove this hypothesis starting from some physical assumptions but rather to demonstrate that this hypothesis is experimentally verified and, assuming that the string theory correctly describes the natural law, to calculate the geometry (Kähler potential and the metric) of the moduli space of the Calabi–Yau manifold, thus providing a way to calculate the metric of the Calabi–Yau manifold itself directly from the experimental data. ................................................................................................................... Subject Index B41, B55 1. Introduction Some researchers, including one of the authors of this work (H.S.), have been working on flavor physics, assuming that some discrete symmetry plays an important role in its understanding [1–9]; S3, S4, A4, etc. -
Umbral Moonshine and K3 Surfaces Arxiv:1406.0619V3 [Hep-Th]
SLAC-PUB-16469 Umbral Moonshine and K3 Surfaces Miranda C. N. Cheng∗1 and Sarah Harrisony2 1Institute of Physics and Korteweg-de Vries Institute for Mathematics, University of Amsterdam, Amsterdam, the Netherlandsz 2Stanford Institute for Theoretical Physics, Department of Physics, and Theory Group, SLAC, Stanford University, Stanford, CA 94305, USA Abstract Recently, 23 cases of umbral moonshine, relating mock modular forms and finite groups, have been discovered in the context of the 23 even unimodular Niemeier lattices. One of the 23 cases in fact coincides with the so-called Mathieu moonshine, discovered in the context of K3 non-linear sigma models. In this paper we establish a uniform relation between all 23 cases of umbral moonshine and K3 sigma models, and thereby take a first step in placing umbral moonshine into a geometric and physical context. This is achieved by relating the ADE root systems of the Niemeier lattices to the ADE du Val singularities that a K3 surface can develop, and the configuration of smooth rational curves in their resolutions. A geometric interpretation of our results is given in terms of the marking of K3 surfaces by Niemeier lattices. arXiv:1406.0619v3 [hep-th] 18 Mar 2015 ∗[email protected] [email protected] zOn leave from CNRS, Paris. 1 This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-76SF00515 and HEP. Umbral Moonshine and K3 Surfaces 2 Contents 1 Introduction and Summary 3 2 The Elliptic Genus of Du Val Singularities 8 3 Umbral Moonshine and Niemeier Lattices 14 4 Umbral Moonshine and the (Twined) K3 Elliptic Genus 20 5 Geometric Interpretation 27 6 Discussion 30 A Special Functions 32 B Calculations and Proofs 34 C The Twining Functions 41 References 48 Umbral Moonshine and K3 Surfaces 3 1 Introduction and Summary Mock modular forms are interesting functions playing an increasingly important role in various areas of mathematics and theoretical physics. -
Arxiv:1911.10534V3 [Math.AT] 17 Apr 2020 Statement
THE ANDO-HOPKINS-REZK ORIENTATION IS SURJECTIVE SANATH DEVALAPURKAR Abstract. We show that the map π∗MString ! π∗tmf induced by the Ando-Hopkins-Rezk orientation is surjective. This proves an unpublished claim of Hopkins and Mahowald. We do so by constructing an E1-ring B and a map B ! MString such that the composite B ! MString ! tmf is surjective on homotopy. Applications to differential topology, and in particular to Hirzebruch's prize question, are discussed. 1. Introduction The goal of this paper is to show the following result. Theorem 1.1. The map π∗MString ! π∗tmf induced by the Ando-Hopkins-Rezk orientation is surjective. This integral result was originally stated as [Hop02, Theorem 6.25], but, to the best of our knowledge, no proof has appeared in the literature. In [HM02], Hopkins and Mahowald give a proof sketch of Theorem 1.1 for elements of π∗tmf of Adams-Novikov filtration 0. The analogue of Theorem 1.1 for bo (namely, the statement that the map π∗MSpin ! π∗bo induced by the Atiyah-Bott-Shapiro orientation is surjective) is classical [Mil63]. In Section2, we present (as a warmup) a proof of this surjectivity result for bo via a technique which generalizes to prove Theorem 1.1. We construct an E1-ring A with an E1-map A ! MSpin. The E1-ring A is a particular E1-Thom spectrum whose mod 2 homology is given by the polynomial subalgebra 4 F2[ζ1 ] of the mod 2 dual Steenrod algebra. The Atiyah-Bott-Shapiro orientation MSpin ! bo is an E1-map, and so the composite A ! MSpin ! bo is an E1-map. -
Our Mathematical Universe: I. How the Monster Group Dictates All of Physics
October, 2011 PROGRESS IN PHYSICS Volume 4 Our Mathematical Universe: I. How the Monster Group Dictates All of Physics Franklin Potter Sciencegems.com, 8642 Marvale Drive, Huntington Beach, CA 92646. E-mail: [email protected] A 4th family b’ quark would confirm that our physical Universe is mathematical and is discrete at the Planck scale. I explain how the Fischer-Greiss Monster Group dic- tates the Standard Model of leptons and quarks in discrete 4-D internal symmetry space and, combined with discrete 4-D spacetime, uniquely produces the finite group Weyl E8 x Weyl E8 = “Weyl” SO(9,1). The Monster’s j-invariant function determines mass ratios of the particles in finite binary rotational subgroups of the Standard Model gauge group, dictates Mobius¨ transformations that lead to the conservation laws, and connects interactions to triality, the Leech lattice, and Golay-24 information coding. 1 Introduction 5. Both 4-D spacetime and 4-D internal symmetry space are discrete at the Planck scale, and both spaces can The ultimate idea that our physical Universe is mathematical be telescoped upwards mathematically by icosians to at the fundamental scale has been conjectured for many cen- 8-D spaces that uniquely combine into 10-D discrete turies. In the past, our marginal understanding of the origin spacetime with discrete Weyl E x Weyl E symmetry of the physical rules of the Universe has been peppered with 8 8 (not the E x E Lie group of superstrings/M-theory). huge gaps, but today our increased understanding of funda- 8 8 mental particles promises to eliminate most of those gaps to 6. -
The Romance Between Maths and Physics
The Romance Between Maths and Physics Miranda C. N. Cheng University of Amsterdam Very happy to be back in NTU indeed! Question 1: Why is Nature predictable at all (to some extent)? Question 2: Why are the predictions in the form of mathematics? the unreasonable effectiveness of mathematics in natural sciences. Eugene Wigner (1960) First we resorted to gods and spirits to explain the world , and then there were ….. mathematicians?! Physicists or Mathematicians? Until the 19th century, the relation between physical sciences and mathematics is so close that there was hardly any distinction made between “physicists” and “mathematicians”. Even after the specialisation starts to be made, the two maintain an extremely close relation and cannot live without one another. Some of the love declarations … Dirac (1938) If you want to be a physicist, you must do three things— first, study mathematics, second, study more mathematics, and third, do the same. Sommerfeld (1934) Our experience up to date justifies us in feeling sure that in Nature is actualized the ideal of mathematical simplicity. It is my conviction that pure mathematical construction enables us to discover the concepts and the laws connecting them, which gives us the key to understanding nature… In a certain sense, therefore, I hold it true that pure thought can grasp reality, as the ancients dreamed. Einstein (1934) Indeed, the most irresistible reductionistic charm of physics, could not have been possible without mathematics … Love or Hate? It’s Complicated… In the era when Physics seemed invincible (think about the standard model), they thought they didn’t need each other anymore. -
§2. Elliptic Curves: J-Invariant (Jan 31, Feb 4,7,9,11,14) After
24 JENIA TEVELEV §2. Elliptic curves: j-invariant (Jan 31, Feb 4,7,9,11,14) After the projective line P1, the easiest algebraic curve to understand is an elliptic curve (Riemann surface of genus 1). Let M = isom. classes of elliptic curves . 1 { } We are going to assign to each elliptic curve a number, called its j-invariant and prove that 1 M1 = Aj . 1 1 So as a space M1 A is not very interesting. However, understanding A ! as a moduli space of elliptic curves leads to some breath-taking mathemat- ics. More generally, we introduce M = isom. classes of smooth projective curves of genus g g { } and M = isom. classes of curves C of genus g with points p , . , p C . g,n { 1 n ∈ } We will return to these moduli spaces later in the course. But first let us recall some basic facts about algebraic curves = compact Riemann surfaces. We refer to [G] and [Mi] for a rigorous and detailed exposition. §2.1. Algebraic functions, algebraic curves, and Riemann surfaces. The theory of algebraic curves has roots in analysis of Abelian integrals. An easiest example is the elliptic integral: in 1655 Wallis began to study the arc length of an ellipse (X/a)2 + (Y/b)2 = 1. The equation for the ellipse can be solved for Y : Y = (b/a) (a2 X2), − and this can easily be differentiated !to find bX Y ! = − . a√a2 X2 − 2 This is squared and put into the integral 1 + (Y !) dX for the arc length. Now the substitution x = X/a results in " ! 1 e2x2 s = a − dx, 1 x2 # $ − between the limits 0 and X/a, where e = 1 (b/a)2 is the eccentricity. -
K3 Surfaces, N= 4 Dyons, and the Mathieu Group
K3 Surfaces, =4 Dyons, N and the Mathieu Group M24 Miranda C. N. Cheng Department of Physics, Harvard University, Cambridge, MA 02138, USA Abstract A close relationship between K3 surfaces and the Mathieu groups has been established in the last century. Furthermore, it has been observed recently that the elliptic genus of K3 has a natural inter- pretation in terms of the dimensions of representations of the largest Mathieu group M24. In this paper we first give further evidence for this possibility by studying the elliptic genus of K3 surfaces twisted by some simple symplectic automorphisms. These partition functions with insertions of elements of M24 (the McKay-Thompson series) give further information about the relevant representation. We then point out that this new “moonshine” for the largest Mathieu group is con- nected to an earlier observation on a moonshine of M24 through the 1/4-BPS spectrum of K3 T 2-compactified type II string theory. This insight on the symmetry× of the theory sheds new light on the gener- alised Kac-Moody algebra structure appearing in the spectrum, and leads to predictions for new elliptic genera of K3, perturbative spec- arXiv:1005.5415v2 [hep-th] 3 Jun 2010 trum of the toroidally compactified heterotic string, and the index for the 1/4-BPS dyons in the d = 4, = 4 string theory, twisted by elements of the group of stringy K3N isometries. 1 1 Introduction and Summary Recently there have been two new observations relating K3 surfaces and the largest Mathieu group M24. They seem to suggest that the sporadic group M24 naturally acts on the spectrum of K3-compactified string theory. -
Monstrous Entanglement JHEP10(2017)147 ] (Or Its Chiral 8 [ 3 20 6 22 11 15 4 22 28 9 16 29 26 , As Its Automorphism Group
Published for SISSA by Springer Received: September 1, 2017 Accepted: October 12, 2017 Published: October 20, 2017 Monstrous entanglement JHEP10(2017)147 Diptarka Das,a Shouvik Dattab and Sridip Pala aDepartment of Physics, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, U.S.A. bInstitut f¨urTheoretische Physik, Eidgen¨ossischeTechnische Hochschule Z¨urich, Wolfgang-Pauli-Strasse 27, 8049 Z¨urich,Switzerland E-mail: [email protected], [email protected], [email protected] Abstract: The Monster CFT plays an important role in moonshine and is also conjectured to be the holographic dual to pure gravity in AdS3. We investigate the entanglement and R´enyi entropies of this theory along with other extremal CFTs. The R´enyi entropies of a single interval on the torus are evaluated using the short interval expansion. Each order in the expansion contains closed form expressions in the modular parameter. The leading terms in the q-series are shown to precisely agree with the universal corrections to R´enyi entropies at low temperatures. Furthermore, these results are shown to match with bulk computations of R´enyi entropy using the one-loop partition function on handlebodies. We also explore some features of R´enyi entropies of two intervals on the plane. Keywords: Conformal Field Theory, AdS-CFT Correspondence, Field Theories in Lower Dimensions, Discrete Symmetries ArXiv ePrint: 1708.04242 Open Access, c The Authors. https://doi.org/10.1007/JHEP10(2017)147 Article funded by SCOAP3. Contents 1 Introduction1 2 Short interval expansion -
Final Report (PDF)
Novel Approaches to the Finite Simple Groups John McKay (Concordia University), Roland Friedrich (Humboldt University Berlin) 22. April–29. April 2012 1 Motivation It is now accepted that the classification of finite simple groups (CFSG) is complete. Our purpose is in con- structions which we re-examine in the light of observations that suggest that a substantial amount of insight is to be gained if we pursue novel connections to other, apparently disparate, areas of mathematics. This may lead to a natural home for the 26 sporadic simple groups which today are considered the complement of the Lie-Chevalley groups. 2 Overview of the Field In order to understand the importance of the new ideas and conjectures linked with Monstrous Moon- shine (MM) that we set out to develop, we have to understand its history, see [15, 19, 20]. Although the Monster is the most spectacular of the sporadic groups, it is just one of 26 groups under our wing. We discern three major evolutionary periods linked with the Monster group, the early and foundational one [5, 6, 7, 9, 10, 11, 17, 18, 22, 23], the time when the fruits of previous labour could be picked, cul- minating in Borcherds’ Fields medal rewarded proof of the conjecture [2], and finally the post Moonshine one, where it is becoming evident that we are not dealing with one particular isolated phenomenon but rather with a (possible) new class of objects of which MM is the most prominent representative so far, and its new mathematical connections [16]. An electronic collection of relevant articles for the subject has been posted at: http://www.fields.utoronto.ca/˜jplazas/MoonshineRoadmap.html 3 Recent Developments and Open Problems During the focused research group various parts of this picture became clearer. -
Modular Forms in String Theory and Moonshine
(Mock) Modular Forms in String Theory and Moonshine Miranda C. N. Cheng Korteweg-de-Vries Institute of Mathematics and Institute of Physics, University of Amsterdam, Amsterdam, the Netherlands Abstract Lecture notes for the Asian Winter School at OIST, Jan 2016. Contents 1 Lecture 1: 2d CFT and Modular Objects 1 1.1 Partition Function of a 2d CFT . .1 1.2 Modular Forms . .4 1.3 Example: The Free Boson . .8 1.4 Example: Ising Model . 10 1.5 N = 2 SCA, Elliptic Genus, and Jacobi Forms . 11 1.6 Symmetries and Twined Functions . 16 1.7 Orbifolding . 18 2 Lecture 2: Moonshine and Physics 22 2.1 Monstrous Moonshine . 22 2.2 M24 Moonshine . 24 2.3 Mock Modular Forms . 27 2.4 Umbral Moonshine . 31 2.5 Moonshine and String Theory . 33 2.6 Other Moonshine . 35 References 35 1 1 Lecture 1: 2d CFT and Modular Objects We assume basic knowledge of 2d CFTs. 1.1 Partition Function of a 2d CFT For the convenience of discussion we focus on theories with a Lagrangian description and in particular have a description as sigma models. This in- cludes, for instance, non-linear sigma models on Calabi{Yau manifolds and WZW models. The general lessons we draw are however applicable to generic 2d CFTs. An important restriction though is that the CFT has a discrete spectrum. What are we quantising? Hence, the Hilbert space V is obtained by quantising LM = the free loop space of maps S1 ! M. Recall that in the usual radial quantisation of 2d CFTs we consider a plane with 2 special points: the point of origin and that of infinity. -
No. 2, 435-459. Richard E. Borcherds,∗ Mathematics Department, University of California at Berkeley, CA 94720-3840 U
Modular Moonshine II. 24 July 1994, corrected 19 Sept 1995 Duke Math. J. 83 (1996) no. 2, 435-459. Richard E. Borcherds,∗ Mathematics department, University of California at Berkeley, CA 94720-3840 U. S. A. e-mail: [email protected] Alex J. E. Ryba, Dept of Mathematics, Marquette University, Milwaukee, WI 53233, U. S. A. e-mail: [email protected] The monster simple group acts on the monster vertex algebra, and the moonshine conjectures state that the traces of elements of the monster on the vertex algebra are Hauptmoduls. Ryba [R94] conjectured the existence of similar vertex algebras over fields of characteristics p acted on by the centralizers of certain elements of prime order p in the monster, and conjectured that the Brauer traces of p-regular elements of the centralizers were certain Hauptmoduls. We will prove these conjectures when the centralizer involves a sporadic group (p 11, corresponding to the sporadic groups B, F i0 , T h, HN, He, and M12). ≤ 24 Contents. 1. Introduction. Notation. 2. Cohomology and modular representations. 3. Vertex superalgebras mod p. 4. A vanishing theorem for cohomology. 5. The case p = 2. 6. Example: the Held group. 7. Open problems and conjectures. 1. Introduction. The original “moonshine conjectures” of Conway, Norton, McKay, and Thompson said that the monster simple group M has an infinite dimensional graded representation V = n ZVn such that the dimension of Vn n 1 ⊕ ∈ is the coefficient of q of the elliptic modular function j(τ) 744 = q− +196884q+ , and more generally the n − ··· McKay-Thompson series Tg(τ) = n Z Tr(g Vn)q is a Hauptmodul for some genus 0 congruence subgroup P ∈ | of SL2(R). -
Moonshines for L2(11) and M12
Moonshines for L2(11) and M12 Suresh Govindarajan Department of Physics Indian Institute of Technology Madras (Work done with my student Sutapa Samanta) Talk at the Workshop on Modular Forms and Black Holes @NISER, Bhubaneswar on January 13. 2017 Plan Introduction Some finite group theory Moonshine BKM Lie superalgebras Introduction Classification of Finite Simple Groups Every finite simple group is isomorphic to one of the following groups: (Source: Wikipedia) I A cyclic group with prime order; I An alternating group of degree at least 5; I A simple group of Lie type, including both I the classical Lie groups, namely the groups of projective special linear, unitary, symplectic, or orthogonal transformations over a finite field; I the exceptional and twisted groups of Lie type (including the Tits group which is not strictly a group of Lie type). I The 26 sporadic simple groups. The classification was completed in 2004 when Aschbacher and Smith filled the last gap (`the quasi-thin case') in the proof. Fun Reading: Symmetry and the Monster by Mark Ronan The sporadic simple groups I the Mathieu groups: M11, M12, M22, M23, M24; (found in 1861) I the Janko groups: J1, J2, J3, J4; (others 1965-1980) I the Conway groups; Co1, Co2, Co3; 0 I the Fischer groups; Fi22. Fi23, Fi24; I the Higman-Sims group; HS I the McLaughlin group: McL I the Held group: He; I the Rudvalis group Ru; I the Suzuki sporadic group: Suz; 0 I the O'Nan group: O N; I Harada-Norton group: HN; I the Lyons group: Ly; I the Thompson group: Th; I the baby Monster group: B and Sources: Wikipedia and Mark Ronan I the Fischer-Griess Monster group: M Monstrous Moonshine Conjectures I The j-function has the followed q-series: (q = exp(2πiτ)) j(τ)−744 = q−1+[196883+1] q+[21296876+196883+1] q2+··· I McKay observed that 196883 and 21296876 are the dimensions of the two smallest irreps of the Monster group.