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CERN Courier–Digital Edition
CERNMarch/April 2021 cerncourier.com COURIERReporting on international high-energy physics WELCOME CERN Courier – digital edition Welcome to the digital edition of the March/April 2021 issue of CERN Courier. Hadron colliders have contributed to a golden era of discovery in high-energy physics, hosting experiments that have enabled physicists to unearth the cornerstones of the Standard Model. This success story began 50 years ago with CERN’s Intersecting Storage Rings (featured on the cover of this issue) and culminated in the Large Hadron Collider (p38) – which has spawned thousands of papers in its first 10 years of operations alone (p47). It also bodes well for a potential future circular collider at CERN operating at a centre-of-mass energy of at least 100 TeV, a feasibility study for which is now in full swing. Even hadron colliders have their limits, however. To explore possible new physics at the highest energy scales, physicists are mounting a series of experiments to search for very weakly interacting “slim” particles that arise from extensions in the Standard Model (p25). Also celebrating a golden anniversary this year is the Institute for Nuclear Research in Moscow (p33), while, elsewhere in this issue: quantum sensors HADRON COLLIDERS target gravitational waves (p10); X-rays go behind the scenes of supernova 50 years of discovery 1987A (p12); a high-performance computing collaboration forms to handle the big-physics data onslaught (p22); Steven Weinberg talks about his latest work (p51); and much more. To sign up to the new-issue alert, please visit: http://comms.iop.org/k/iop/cerncourier To subscribe to the magazine, please visit: https://cerncourier.com/p/about-cern-courier EDITOR: MATTHEW CHALMERS, CERN DIGITAL EDITION CREATED BY IOP PUBLISHING ATLAS spots rare Higgs decay Weinberg on effective field theory Hunting for WISPs CCMarApr21_Cover_v1.indd 1 12/02/2021 09:24 CERNCOURIER www. -
Understanding Cosmic Acceleration: Connecting Theory and Observation
Understanding Cosmic Acceleration V(!) ! E Hivon Hiranya Peiris Hubble Fellow/ Enrico Fermi Fellow University of Chicago #OMPOSITIONOFAND+ECosmic HistoryY%VENTS$ UR/ INGTHE%CosmicVOLUTIONOFTHE5 MysteryNIVERSE presentpresent energy energy Y density "7totTOT = 1(k=0)K density DAR RADIATION KENER dark energy YDENSIT DARK G (73%) DARKMATTER Y G ENERGY dark matter DARK MA(23.6%)TTER TIONOFENER WHITEWELLUNDERSTOOD DARKNESSPROPORTIONALTOPOORUNDERSTANDING BARYONS BARbaryonsYONS AC (4.4%) FR !42 !33 !22 !16 !12 Fractional Energy Density 10 s 10 s 10 s 10 s 10 s 1 sec 380 kyr 14 Gyr ~1015 GeV SCALEFACTimeTOR ~1 MeV ~0.2 MeV 4IME TS TS TS TS TS TSEC TKYR T'YR Y Y Planck GUT Y T=100 TeV nucleosynthesis Y IES TION TS EOUT DIAL ORS TIONS G TION TION Z T Energy THESIS symmetry (ILC XA 100) MA EN EE WNOF ESTHESIS V IMOR GENERATEOBSERVABLE IT OR ELER ALTHEOR TIONS EF SIGNATURESINTHE#-" EAKSYMMETR EIONIZA INOFR Y% OMBINA R E6 EAKDO #X ONASYMMETR SIC W '54SYMMETR IMELINEOF EFFWR Y Y EC TUR O NUCLEOSYN ), * +E R 4 PLANCKENER Generation BR TR TURBA UC PH Cosmic Microwave NEUTR OUSTICOSCILLA BAR TIONOFPR ER A AC STR of primordial ELEC non-linear growth of P 44 LIMITOFACC Background Emitted perturbations perturbations: GENER ES carries signature of signature on CMB TUR GENERATIONOFGRAVITYWAVES INITIALDENSITYPERTURBATIONS acoustic#-"%MITT oscillationsED NON LINEARSTR andUCTUR EIMPARTS #!0-!0OBSERVES#-" ANDINITIALDENSITYPERTURBATIONS GROWIMPARTINGFLUCTUATIONS CARIESSIGNATUREOFACOUSTIC SIGNATUREON#-"THROUGH *throughEFFWRITESUPANDGR weakADUATES WHICHSEEDSTRUCTUREFORMATION -
From Dark Matter to Galaxies with Convolutional Networks
From Dark Matter to Galaxies with Convolutional Networks Xinyue Zhang*, Yanfang Wang*, Wei Zhang*, Siyu He Yueqiu Sun*∗ Department of Physics, Carnegie Mellon University Center for Data Science, New York University Center for Computational Astrophysics, Flatiron Institute xz2139,yw1007,wz1218,[email protected] [email protected] Gabriella Contardo, Francisco Shirley Ho Villaescusa-Navarro Center for Computational Astrophysics, Flatiron Institute Center for Computational Astrophysics, Flatiron Institute Department of Astrophysical Sciences, Princeton gcontardo,[email protected] University Department of Physics, Carnegie Mellon University [email protected] ABSTRACT 1 INTRODUCTION Cosmological surveys aim at answering fundamental questions Cosmology focuses on studying the origin and evolution of our about our Universe, including the nature of dark matter or the rea- Universe, from the Big Bang to today and its future. One of the holy son of unexpected accelerated expansion of the Universe. In order grails of cosmology is to understand and define the physical rules to answer these questions, two important ingredients are needed: and parameters that led to our actual Universe. Astronomers survey 1) data from observations and 2) a theoretical model that allows fast large volumes of the Universe [10, 12, 17, 32] and employ a large comparison between observation and theory. Most of the cosmolog- ensemble of computer simulations to compare with the observed ical surveys observe galaxies, which are very difficult to model theo- data in order to extract the full information of our own Universe. retically due to the complicated physics involved in their formation The constant improvement of computational power has allowed and evolution; modeling realistic galaxies over cosmological vol- cosmologists to pursue elucidating the fundamental parameters umes requires running computationally expensive hydrodynamic and laws of the Universe by relying on simulations as their theory simulations that can cost millions of CPU hours. -
Dark Matter Search with the Newsdm Experiment Using Machine Learning Techniques
UNIVERSITÀ DEGLI STUDI DI NAPOLI “FEDERICO II” Scuola Politecnica e delle Scienze di Base Area Didattica di Scienze Matematiche Fisiche e Naturali Dipartimento di Fisica “Ettore Pancini” Laurea Magistrale in Fisica Dark Matter search with the NEWSdm experiment using machine learning techniques Relatori: Candidato: Prof. Giovanni De Lellis Chiara Errico Dott.ssa Antonia Di Crescenzo Matricola N94/457 Dott. Andrey Alexandrov Anno Accademico 2018/2019 Acting with love brings huge happening · Contents Introduction1 1 Dark matter: first evidences and detection3 1.1 First evidences of dark matter.................3 1.2 WIMPs..............................8 1.3 Search for dark matter...................... 11 1.4 Direct detection.......................... 13 1.5 Detectors for direct search.................... 15 1.5.1 Bolometers........................ 16 1.5.2 Liquid noble-gas detector................. 17 1.5.3 Scintillator......................... 18 1.6 Direct detection experiment general result........... 20 1.7 Directionality........................... 21 1.7.1 Nuclear Emulsion..................... 23 2 The NEWSdm experiment 25 2.1 Nano Imaging Trackers...................... 25 2.2 Layout of the NEWSdm detector................ 28 2.2.1 Technical test....................... 29 2.3 Expected background....................... 30 2.3.1 External background................... 31 2.3.2 Intrinsic background................... 34 2.3.3 Instrumental background................. 35 2.4 Optical microscope........................ 35 2.4.1 Super-resolution microscope for dark matter search.. 38 2.5 Candidate Selection........................ 40 2.6 Candidate Validation....................... 42 iii Contents iv 3 Reconstruction of nanometric tracks 47 3.1 Scanning process......................... 47 3.2 Analysis of NIT exposed to Carbon ions............ 49 3.3 Shape analysis........................... 50 3.4 Plasmon analysis......................... 51 3.4.1 Accuracy.......................... 52 3.4.2 Npeaks.......................... -
1St Edition of Brown Physics Imagine, 2017-2018
A note from the chair... "Fellow Travelers" Ladd Observatory.......................11 Sci-Toons....................................12 Faculty News.................. 15-16, 23 At-A-Glance................................18 s the current academic year draws to an end, I’m happy to report that the Physics Department has had Newton's Apple Tree................. 23 an exciting and productive year. At this year's Commencement, the department awarded thirty five "Untagling the Fabric of the undergraduate degrees (ScB and AB), twenty two Master’s degrees, and ten Ph.D. degrees. It is always Agratifying for me to congratulate our graduates and meet their families at the graduation ceremony. This Universe," Professor Jim Gates..26 Alumni News............................. 27 year, the University also awarded my colleague, Professor J. Michael Kosterlitz, an honorary degree for his Events this year......................... 28 achievement in the research of low-dimensional phase transitions. Well deserved, Michael! Remembering Charles Elbaum, Our faculty and students continue to generate cutting-edge scholarships. Some of their exciting Professor Emeritus.................... 29 research are highlighted in this magazine and have been published in high impact journals. I encourage you to learn about these and future works by watching the department YouTube channel or reading faculty’s original publications. Because of their excellent work, many of our undergraduate and graduate students have received students prestigious awards both from Brown and externally. As Chair, I feel proud every time I hear good news from our On the cover: PhD student Shayan Lame students, ranging from receiving the NSF Graduate Fellowship to a successful defense of thier senior thesis or a Class of 2018............................. -
Searches for Heavy Vector-Like Quarks Decaying to High Transverse
Searches for heavy vector-like quarks decaying to high transverse momentum W bosons and top- or bottom-quarks and weak mode identification with the ATLAS detector by Steffen Henkelmann B.Sc., The University of Göttingen, 2011 M.Sc., The University of Göttingen, 2013 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY in The Faculty of Graduate and Postdoctoral Studies (Physics) THE UNIVERSITY OF BRITISH COLUMBIA CERN-THESIS-2018-212 29/06/2018 (Vancouver) August 2018 c Steffen Henkelmann 2018 The following individuals certify that they have read, and recommend to the Faculty of Gradu- ate and Postdoctoral Studies for acceptance, the dissertation entitled: Searches for heavy vector-like quarks decaying to high transverse momentum W bosons and top- or bottom-quarks and weak mode identification with the ATLAS detector submitted by Steffen Henkelmann in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Physics Examining committee: Alison Lister, Physics & Astronomy Supervisor Colin Gay, Physics & Astronomy Supervisory Committee Member Gary Hinshaw, Physics & Astronomy Supervisory Committee Member David Morrissey, TRIUMF Supervisory Committee Member Janis McKenna, Physics & Astronomy University Examiner Donald Fleming, Chemistry University Examiner ii Abstract The precise understanding of elementary particle properties and theory parameters predicted by the Standard Model of Particle Physics (SM) as well as the revelation of new physics phe- nomena beyond the scope of that successful theory are at the heart of modern fundamental particle physics research. The Large Hadron Collider (LHC) and modern particle detectors pro- vide the key to probing nature at energy scales never achieved in an experimental controlled setup before. -
2019/20 Perimeter Institute Annual Report English
2020 ANNUAL REPORT VISION To create the world’s foremost centre for research, graduate training, and educational outreach in theoretical physics, uniting public and private partners, and the world’s best scientific minds, in a shared enterprise to achieve breakthroughs that will transform our future. Estelle Inack, Jason Iaconis, and Roger Melko, October 2019 CONTENTS Message from the Board Chair .............................................2 Message from the Institute Director ......................................3 How Perimeter Measures Up ................................................4 Research ...............................................................................6 Training ................................................................................26 Outreach ..............................................................................32 Our Future is Bright .............................................................38 Advancement ......................................................................40 Governance and Finance ....................................................44 Appendices .........................................................................51 This report covers the activities and finances of Perimeter Institute for Theoretical Physics from August 1, 2019, to July 31, 2020. TODAY'S THEORETICAL PHYSICS IS TOMORROW'S TECHNOLOGY MESSAGE FROM THE BOARD CHAIR The coronavirus has made the past year very difficult. The loss transform epidemiology, finance and insurance, risk of loved ones and the economic, -
Breakthrough Prize in Mathematics Awarded to Terry Tao
156 Breakthrough Prize in Mathematics awarded to Terry Tao Our congratulations to Australian Mathematician Terry Tao, one of five inaugu- ral winners of the Breakthrough Prizes in Mathematics, announced on 23 June. Terry is based at the University of California, Los Angeles, and has been awarded the prize for numerous breakthrough contributions to harmonic analysis, combi- natorics, partial differential equations and analytic number theory. The Breakthrough Prize in Mathematics was launched by Mark Zuckerberg and Yuri Milner at the Breakthrough Prize ceremony in December 2013. The other winners are Simon Donaldson, Maxim Kontsevich, Jacob Lurie and Richard Tay- lor. All five recipients of the Prize have agreed to serve on the Selection Committee, responsible for choosing subsequent winners from a pool of candidates nominated in an online process which is open to the public. From 2015 onwards, one Break- through Prize in Mathematics will be awarded every year. The Breakthrough Prizes honor important, primarily recent, achievements in the categories of Fundamental Physics, Life Sciences and Mathematics. The prizes were founded by Sergey Brin and Anne Wojcicki, Mark Zuckerberg and Priscilla Chan, and Yuri and Julia Milner, and aim to celebrate scientists and generate excitement about the pursuit of science as a career. Laureates will receive their trophies and $3 million each in prize money at a televised award ceremony in November, designed to celebrate their achievements and inspire the next genera- tion of scientists. As part of the ceremony schedule, they also engage in a program of lectures and discussions. See https://breakthroughprize.org and http://www.nytimes.com/2014/06/23/us/ the-multimillion-dollar-minds-of-5-mathematical-masters.html? r=1 for further in- formation.. -
Astronomers Win Big in Science Mega-Awards US$36 Million in Breakthrough Prizes Awarded to Researchers in Physics, Life Sciences and Mathematics
NATURE | NEWS Astronomers win big in science mega-awards US$36 million in Breakthrough prizes awarded to researchers in physics, life sciences and mathematics. Mark Zastrow 10 November 2014 Steve Jennings/Getty Astrophysicists Brian Schmidt, Adam Riess and Saul Perlmutter accept their US$3-million Breakthrough Prizes in Physics on 9 November. The astronomers who discovered dark energy and the developers of the gene-editing technique known as CRISPR have won Breakthrough prizes. At US$3 million per winner, the awards are science’s most lucrative prize. Winners were announced on 9 November at a gala in the iconic Hangar One at NASA’s Ames Research Center in Mountain View, California. The first Breakthrough prizes were given in 2012 as a series of physics awards given by Russian Internet entrepreneur Yuri Milner. He soon recruited other online magnates, including Mark Zuckerberg of Facebook, Sergey Brin of Google and Jack Ma of Alibaba Group, to fund awards in life sciences and mathematics. The prizes, which attempt to elevate scientists to pop-culture heroes, have drawn both praise and criticism from the research community. This year’s Breakthrough Prize in Fundamental Physics was given to two teams of astrophysicists who raced to find exploding white dwarfs in distant galaxies. One group was led by Saul Perlmutter of the University of California (UC) in Berkeley, and the other by Adam Riess of Johns Hopkins University in Baltimore, Maryland, and Brian Schmidt of the Australian National University in Weston Creek. Their work led to the discovery, in 1998, that the expansion of the Universe was speeding up, leaving cosmologists struggling to explain the apparent ‘dark energy’ that is driving the phenomenon. -
Advanced Dark Energy Physics Telescope
JDEM/JDEM/ADEPTADEPT AADVANCEDDVANCED DDARKARK EENERGYNERGY PPHYSICSHYSICS TTELESCOPEELESCOPE HEPAP Feb 24, 2005 C. Bennett (Johns Hopkins Univ) ADEPT-1 ADEPT Science Team JHU Goddard Jonathan Bagger Gary Hinshaw Chuck Bennett Harvey Moseley Holland Ford Bill Oegerle Warren Moos Adam Riess Arizona Daniel Eisenstein Princeton Chris Hirata STScI David Spergel Harry Ferguson Swinburne Hawaii Chris Blake John Tonry Karl Glazebrook Penn U British Columbia Licia Verde Catherine Heymans HEPAP Feb 24, 2005 C. Bennett (Johns Hopkins Univ) ADEPT-2 Dark Energy Overview Dark energy equation of state: P = w ρ Options have HUGE implications for fundamental physics w = w0 (constant) ? w = w(z) (not constant) ? w is irrelevant, because GR is wrong ? Complementary space-based and ground-based measurements are both needed ADEPT is designed to do from space what needs to be done from space in a cost-controlled manner HEPAP Feb 24, 2005 C. Bennett (Johns Hopkins Univ) ADEPT-3 What is ADEPT? A dark energy probe, primarily Baryon Acoustic Oscillations (BAO) Redshift survey of 100 million galaxies 1 ≤ z ≤2 Slitless spectroscopy 1.3 − 2.0 µm Hα Nearly cosmic variance limited over nearly the full sky (28,600 deg2) First and final generation 1 ≤ z ≤2BAO measurement A dark energy probe, also using Type Ia Supernovae (SNe Ia) ∼1000 SNe Ia 0.8 ≤ z ≤1.3with no additional hardware or operating modes Products: ≡ δθ DA=angular diameter distance DA l / ≡ ()π 1/2 DL = luminosity distance DL Lf/4 H(z) expansion rate Galaxy redshift survey (power spectrum shape, tests of modified gravity w/CMB) HEPAP Feb 24, 2005 C. -
Economics 2880- 1: Introduction Study of Economics of Science Has Developed Rapidly in Past Decade Or So Bcs
Economics 2880- 1: Introduction Study of economics of science has developed rapidly in past decade or so bcs: FACTOR 1)Sci-tech Illuminate major economic problems and Behavior a) Macro/economic growth accounting leaves residual labeled TC that we need to shrink to do more than “observe”/measure growth. First efforts to fill it in were with Human Capital … changing the quality of labot but this analysis treats, say, an engineering degree was the same over time. Then an effort using R&D and patents to get some non-residual measure of technology – disruptive or otherwise – into aggregate production function. STOCK OF USEFUL KNOWLEDGE as key input in long term. b) Micro-analysis labor and industrial organization/valuation of firms also forced to examine role of science and engineering. Labor has problem of explaining why despite large increase in education/skills the wage distribution widened from 1970s-80s to present. First effort was “residual” skill-biased TC. But then wage distribution changed in a different way – polarization, Don't want too many epicycles/unobserved TC. Industrial org/valuation of firms has problem explaining firm value, which is nowadays 80% intangible capital – ideas, ability to monetize ideas, etc. c)The sluggish productivity problem Despite the huge increase in number of Scientists &Engineers and in RD spending and in output– papers, patents, productivity growth had STAGNATED in advanced countries and declined in China, Korea, etc. Are there diminishing returns to S&E? is it ideas? Are Ideas Getting Harder to Find? Nicholas Bloom, Charles I. Jones, John Van Reenen, Michael Webb NBER Working Paper No. -
May 2016 LIGO and Virgo Receive Special Breakthrough Prize
The latest astroparticle physics news. Trouble viewing this newsletter? Click here. May 2016 LIGO and Virgo receive Special Breakthrough Prize More than 1000 scientists and engineers involved in the detection of gravitational waves have been awarded a special Breakthrough Prize in Fundamental Physics. The award of $3 million will be shared between LIGO founders Ronald WP Drever, Kip S Thorne, and Rainer Weiss, and 1005 others in the LIGO-Virgo Collaboration as well as seven additional scientists recognised for their contributions to the success of LIGO. Edward Witten, the chair of the Selection Committee said: “This amazing achievement lets us observe for the first time some of the remarkable workings of Einstein’s theory. Theoretical ideas about black holes which were close to being science fiction when I was a student are now reality.” Yuri Milner, one of the founders of the Breakthrough Prize, described the group’s achievement as “a perfect science story.” The prizes can be shared by any number of scientists. All of the authors of the paper announcing the direct detection of the GW150914 event are included. The seven scientists in addition are Luc Blanchet, CNRS; Thibault Damour, IHES; Lawrence Kidder, Cornell University; Frans Pretorius, Princeton University; Mark Scheel, Caltech; Saul A. Teukolsky, Cornell University; Rochus E. Vogt, Caltech. APPEC chair Frank Linde said: “The first direct detection of gravitational waves was extremely exciting, and has sparked more and more interest in the field. I am very pleased that this international group of pioneers has been honoured with a Breakthrough Prize, and it is a good reminder of the cooperation and collaboration needed to make great strides in science.