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Scaling Relations in Experimental Ecology
by Gardner Robert H. W. Michael Kemp Victor S. Kennedy John E. PetersenThis book discusses the impact of recent advances in the theory of "scaling relationships" and identifies critical issues that must be considered if experimental results are used to understand the temporal and spatial scales of actual ecosystems.
Scaling up SDGs Implementation: Emerging Cases from State, Development and Private Sectors (Sustainable Development Goals Series)
by Godwell Nhamo Vuyo Mjimba Gbadebo O. A. OdularuThis volume challenges global leaders and citizenry to do more in order to resource the implementation of the 2030 Agenda for Sustainable Development (AfSD) and its 17 interwoven Sustainable Development Goals (SDGs). Starting from the concept ‘we cannot manage what we cannot measure’, the book presents some cases showing how to draw national level baselines for the domestication and localisation of the SDGs seeking to provide a clear roadmap towards achieving the 2030 AfSD. Scaling up SDGs Implementation is targeted at the United Nations, national and state governments, sub-national governments, the corporate sector and civil society, including higher education institutes, labour groups, non-governmental organisations and youth movements. The book is cognizant of these institutions’ common, but differentiated responsibilities and capabilities within their socio-political, environmental and economic conditions. The book presents case studies of how the corporate sector has been scaling up SDGs implementation, from the tourism sector, insurance, to the aviation and agricultural sectors. To make sure that no one is left behind, the volume includes cases on solutions for pressing environmental and socio-economic problems ranging from cooperatives in Brazil to the conservation of springs in Zimbabwe. The matter of finding synergies between the climate SDG and the Paris Agreement’s Nationally Determined Contributions (NDCs) is elaborated at length. Lastly, the book discusses how institutions of higher education remain critical pillars in SDGs scaling up, with cases of curriculum re-orientation in South Africa to the rolling out of the Women’s University in Africa. In this context, this volume challenges every global citizen and organization to invest every effort into making the implementation of the SDGs a success as we welcome the second four to five year segment down the road to the year 2030.
Scaling-up Solutions for Farmers: Technology, Partnerships and Convergence
by Suhas P. Wani K. V. Raju Tapas BhattacharyyaThis book provides a unique account of cross-sectoral innovations through efficient partnerships based on the hands-on experience of internationally renowned contributors specialised in the field of Science of Delivery. The challenges and lessons learned from large development initiatives based in Asia, and from the work undertaken by international research institutions, such as the FAO, are brought together in this book to benefit development agencies, policy makers, corporates, post graduate students, farmers’ organizations, and those involved in supplying agricultural inputs and/or buying agricultural produce, particularly in developing countries within Asia and Africa. Through a number of case studies the book describes how the consortium approach of capacity building for equitable and efficient benefits, collective action, and convergence, will benefit millions of small farm-holders in different regions of Asia
The Scalpel and the Butterfly
by Deborah RudacilleAn engrossing and eloquent study of the history and ethics of animal experimentationThe heart of a pig may soon beat in a human chest. Sheep, cattle, and mice have been cloned. Slowly but inexorably scientists are learning how to transfer tissues, organs, and DNA between species. Some think this research is moving too far, too fast, without adequate discussion of possible consequences: Is it ethical to breed animals for spare parts? When does the cost in animal life and suffering outweigh the potential benefit to humans?In precise and elegant prose, The Scalpel and the Butterfly explores the ongoing struggle between the promise offered by new research and the anxiety about safety and ethical implications in the context of the conflict between experimental medicine and animal protection that dates back to the mid-nineteenth century. Deborah Rudacille offers a compelling and cogent look at the history of this divisive topic, from the days of Louis Pasteur and the founding of organized anti-vivisection in England to the Nazi embrace of eugenics, from animal rights to the continuing war between PETA and biomedical researchers, and the latest developments in replacing, reducing, and refining animal use for research and testing.
The Scalpel and the Butterfly - The Conflict Between Animal Research and Animal Protection
by Deborah RudacilleIn this sweeping history of animal research and the animal protection movement, Deborah Rudacille examines the ethical question of whether enhancement of human life justifies the use of animals for research. She shows how the question and the answers provided by both scientists and anti-vivisectionists over the past 150 years have shaped contemporary society. Rudacille anchors her narrative in events from the lives of key players in the history of the war between science and animal protection, describing the work of activists who work outside the law as well as those working to change the system from within.
Scanning Electrochemical Microscopy
by Allen J. BardBecause of its simplicity of use and quantitative results, Scanning Electrochemical Microscopy (SECM) has become an indispensable tool for the study of surface reactivity. The fast expansion of the SECM field over several years has been fueled by the introduction of new probes, commercially available instrumentation, and new practical applications. Scanning Electrochemical Microscopy, Third Edition offers essential background and in-depth overviews of specific applications in self-contained chapters. The vitality and growing popularity of SECM over the past 30+ years have largely been determined by its versatility and capability to remain useful in the changing scientific and technological environments. New applications reported during the last decade reflect significant current activity in biomedical and energy-related research. This thoroughly updated edition provides up-to-date comprehensive reviews of different aspects of SECM. New chapters by renowned professionals in the field cover recent advances in different areas of SECM including nanoSECM, surface reactions and films, batteries, and fuel cells. Expanded coverage of electrocatalysis and surface interrogation as well as photoelectrochemistry and photoelectrocatalysis are also provided. Useful for a broad range of interdisciplinary research—from biological systems to nanopatterning—this book is invaluable to all interested in learning and applying SECM.
Scanning Electron Microscopy and X-Ray Microanalysis: Third Edition
by David C. Joy Joseph I. Goldstein Dale E. Newbury Joseph R. Michael Nicholas W.M. Ritchie John Henry J. ScottThis thoroughly revised and updated Fourth Edition of a time-honored text provides the reader with a comprehensive introduction to the field of scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS) for elemental microanalysis, electron backscatter diffraction analysis (EBSD) for micro-crystallography, and focused ion beams. Students and academic researchers will find the text to be an authoritative and scholarly resource, while SEM operators and a diversity of practitioners -- engineers, technicians, physical and biological scientists, clinicians, and technical managers -- will find that every chapter has been overhauled to meet the more practical needs of the technologist and working professional. In a break with the past, this Fourth Edition de-emphasizes the design and physical operating basis of the instrumentation, including the electron sources, lenses, detectors, etc. In the modern SEM, many of the low level instrument parameters are now controlled and optimized by the microscope''s software, and user access is restricted. Although the software control system provides efficient and reproducible microscopy and microanalysis, the user must understand the parameter space wherein choices are made to achieve effective and meaningful microscopy, microanalysis, and micro-crystallography. Therefore, special emphasis is placed on beam energy, beam current, electron detector characteristics and controls, and ancillary techniques such as energy dispersive x-ray spectrometry (EDS) and electron backscatter diffraction (EBSD). With 13 years between the publication of the third and fourth editions, new coverage reflects the many improvements in the instrument and analysis techniques. The SEM has evolved into a powerful and versatile characterization platform in which morphology, elemental composition, and crystal structure can be evaluated simultaneously. Extension of the SEM into a "dual beam" platform incorporating both electron and ion columns allows precision modification of the specimen by focused ion beam milling. New coverage in the Fourth Edition includes the increasing use of field emission guns and SEM instruments with high resolution capabilities, variable pressure SEM operation, theory, and measurement of x-rays with high throughput silicon drift detector (SDD-EDS) x-ray spectrometers. In addition to powerful vendor- supplied software to support data collection and processing, the microscopist can access advanced capabilities available in free, open source software platforms, including the National Institutes of Health (NIH) ImageJ-Fiji for image processing and the National Institute of Standards and Technology (NIST) DTSA II for quantitative EDS x-ray microanalysis and spectral simulation, both of which are extensively used in this work. However, the user has a responsibility to bring intellect, curiosity, and a proper skepticism to information on a computer screen and to the entire measurement process. This book helps you to achieve this goal. Realigns the text with the needs of a diverse audience from researchers and graduate students to SEM operators and technical managers Emphasizes practical, hands-on operation of the microscope, particularly user selection of the critical operating parameters to achieve meaningful results Provides step-by-step overviews of SEM, EDS, and EBSD and checklists of critical issues for SEM imaging, EDS x-ray microanalysis, and EBSD crystallographic measurements Makes extensive use of open source software: NIH ImageJ-FIJI for image processing and NIST DTSA II for quantitative EDS x-ray microanalysis and EDS spectral simulation. Includes case studies to illustrate practical problem solving Covers Helium ion scanning microscopy Organized into relatively self-contained modules - no need to "read it all" to understand a topic Includes an online supplement--an extensive "Database of Electron-Solid Interactions"--which can be accessed on SpringerLink, in Chapter 3
Scanning Electron Microscopy for the Life Sciences
by Heide SchattenRecent developments in scanning electron microscopy (SEM) have resulted in a wealth of new applications for cell and molecular biology, as well as related biological disciplines. It is now possible to analyze macromolecular complexes within their three-dimensional cellular microenvironment in near native states at high resolution, and to identify specific molecules and their structural and molecular interactions. New approaches include cryo-SEM applications and environmental SEM (ESEM), staining techniques and processing applications combining embedding and resin-extraction for imaging with high resolution SEM, and advances in immuno-labeling. New developments include helium ion microscopy, automated block-face imaging combined with serial sectioning inside an SEM chamber, and Focused Ion Beam Milling (FIB) combined with block-face SEM. With chapters written by experts, this guide gives an overview of SEM and sample processing for SEM, and highlights several advances in cell and molecular biology that greatly benefited from using conventional, cryo, immuno, and high-resolution SEM.
Scanning Force Microscopy of Polymers
by Holger Schönherr G. Julius VancsoThis lab manual introduces the reader to scanning force microscopy of polymers based on a practice-oriented approach. It begins with a broad introduction to the necessary background of SFM, including intermolecular forces and various SFM imaging modes. "Scanning Force Microscopy of Polymers" is developed in a didactically clear and easily understandable style. The application of SFM to visualize and study polymers is exemplified by numerous case studies, including experimental protocols. In addition, the book helps the reader to develop a conscious and critical understanding of SFM data. This approach enables the reader to acquire the knowledge and experimental skills that are necessary to understand and obtain good and reliable SFM results within the shortest time possible.
Scanning Ion Conductance Microscopy (Bioanalytical Reviews #3)
by Tilman E. SchäfferThis book provides a selection of recent developments in scanning ion conductance microscopy (SICM) technology and applications. In recent years, SICM has been applied in an ever-increasing number of areas in the bioanalytical sciences. SICM is based on an electrolyte-filled nanopipette with a nanometer-scale opening, over which an electric potential is applied. The induced ion current is measured, which allows to directly or indirectly quantify various physical quantities such as pipette-sample distance, ion concentration, sample elastic modulus among many others. This makes SICM well suited for applications in electrolytes - most prominently for the study of live cells.This book starts with a historic overview starting from the days of the invention of SICM by Paul Hansma at the University of California at Santa Barbara in 1989. SICM is a member of the family of scanning probe microscopies. It is related to another prominent member of the family, atomic force microscopy (AFM), which has found application in almost any field of nanoscale science. The advantages and disadvantages of SICM over AFM are also outlined. One of the most effective and break-through applications of SICM nanopipettes is in electrochemistry. The different routes and applications for doing electrochemistry using nanopipettes are also discussed. In addition the book highlights the ability of SICM for surface positioning with nanometer precision to open up new vistas in patch clamp measurements subcellular structures. Finally the book presents one research area where SICM has been making a lot of contributions, cardiac research and the endeavors to combine SICM with super-resolution optical microscopy for highest-resolution joint topography and functional imaging.
Scanning Probe Lithography: Fundamentals, Materials, and Applications (Emerging Materials and Technologies)
by Yu Kyoung Ryu Javier Martinez RodrigoThe most complete book available on scanning probe lithography (SPL), this work details the modalities, mechanisms, and current technologies, applications, and materials on which SPL can be performed. It provides a comprehensive overview of this simple and cost-effective technique, which does not require clean room conditions and can be performed in any lab or industry facility to achieve high-resolution and high-quality patterns on a wide range of materials: biological, semiconducting, polymers, and 2D materials. • Introduces historical background of SPL, including evolution of the technique and tools • Explains the mechanism of sample modification/manipulation, types of AFM tips, technical parts of the experimental setup, and materials on which the technique can be applied • Shows the different types of devices and structures fabricated by SPL, together with the processing steps • Contains a complete and state-of-the art package of examples and different approaches, performed by different international research groups • Summarizes strengths, limitations, and potential of SPL This book is aimed at advanced students, technicians, and researchers in materials science, microelectronics, and others working with lithographic techniques and fabrication processes.
Scanning Probe Microscopes: Applications in Science and Technology
by K. S. BirdiScanning Probe Microscopes: Applications in Science and Technology explains, analyzes, and demonstrates the most widely used microscope in the family of microscopes -- the scanning probe microscope. Beginning with an introduction to the development of SPMs, the author introduces the basics of scanning tunneling and atomic force microscopes (STMs an
Scanning Probe Microscopy: The Lab on a Tip (Graduate Texts in Physics)
by Ernst Meyer Roland Bennewitz Hans J. HugWritten by three leading experts in the field, this textbook describes and explains all aspects of the scanning probe microscopy. Emphasis is placed on the experimental design and procedures required to optimize the performance of the various methods. Scanning Probe Microscopy covers not only the physical principles behind scanning probe microscopy but also questions of instrumental designs, basic features of the different imaging modes, and recurring artifacts. The intention is to provide a general textbook for all types of classes that address scanning probe microscopy. Third year undergraduates and beyond should be able to use it for self-study or as textbook to accompany a course on probe microscopy. Furthermore, it will be valuable as reference book in any scanning probe microscopy laboratory. Novel applications and the latest important results are also presented, and the book closes with a look at the future prospects of scanning probe microscopy, also discussing related techniques in nanoscience. Ideally suited as an introduction for graduate students, the book will also serve as a valuable reference for practising researchers developing and using scanning probe techniques.
Scanning Probe Microscopy
by Bert VoigtländerThis book explains the operating principles of atomic force microscopy and scanning tunneling microscopy. The aim of this book is to enable the reader to operate a scanning probe microscope successfully and understand the data obtained with the microscope. The chapters on the scanning probe techniques are complemented by the chapters on fundamentals and important technical aspects. This textbook is primarily aimed at graduate students from physics, materials science, chemistry, nanoscience and engineering, as well as researchers new to the field.
Scanning Probe Microscopy in Nanoscience and Nanotechnology 3
by Bharat BhushanThis book presents the physical and technical foundation of the state of the art in applied scanning probe techniques. It constitutes a timely and comprehensive overview of SPM applications. The chapters in this volume relate to scanning probe microscopy techniques, characterization of various materials and structures and typical industrial applications, including topographic and dynamical surface studies of thin-film semiconductors, polymers, paper, ceramics, and magnetic and biological materials. The chapters are written by leading researchers and application scientists from all over the world and from various industries to provide a broader perspective.
Scanning Probe Studies of Structural and Functional Properties of Ferroelectric Domains and Domain Walls (Springer Theses)
by Philippe TückmantelThis thesis explores the fascinating properties of domain walls in ferroelectric materials. Domain walls can be used as model systems to study fundamental aspects of interface physics, such as crackling noise, with implications extending to a broad variety of systems, from material fracture and earthquakes to solar flares and collective decision making. Ferroelectric domain walls also show functional properties absent from the domains themselves, such as enhanced conduction leading to the tantalizing possibility of reconfigurable nanoelectronic circuitry where domain walls are active components. This work discusses the crackling physics of domain walls in thin films of Pb(Zr0.2Ti0.8)O3, as well as links between the local conductivity of domain walls and nanoscale geometrical distortions due to defects, and discusses unusual polarization textures with rotational components at crossings of ferroelastic twin domains. The results presented in this thesis have important implications for the experimental study of crackling systems.
Scanning SQUID Microscope for Studying Vortex Matter in Type-II Superconductors
by Amit FinklerCommon methods of local magnetic imaging display either a high spatial resolution and relatively poor field sensitivity (MFM, Lorentz microscopy), or a relatively high field sensitivity but limited spatial resolution (scanning SQUID microscopy). Since the magnetic field of a nanoparticle or nanostructure decays rapidly with distance from the structure, the achievable spatial resolution is ultimately limited by the probe-sample separation. This thesis presents a novel method for fabricating the smallest superconducting quantum interference device (SQUID) that resides on the apex of a very sharp tip. The nanoSQUID-on-tip displays a characteristic size down to 100 nm and a field sensitivity of 10^-3 Gauss/Hz^(1/2). A scanning SQUID microsope was constructed by gluing the nanoSQUID-on-tip to a quartz tuning-fork. This enabled the nanoSQUID to be scanned within nanometers of the sample surface, providing simultaneous images of sample topography and the magnetic field distribution. This microscope represents a significant improvement over the existing scanning SQUID techniques and is expected to be able to image the spin of a single electron.
Scanning Transmission Electron Microscopy
by Stephen J. Pennycook Peter D. NellistScanning transmission electron microscopy has become a mainstream technique for imaging and analysis at atomic resolution and sensitivity, and the authors of this book are widely credited with bringing the field to its present popularity. Scanning Transmission Electron Microscopy(STEM): Imaging and Analysis will provide a comprehensive explanation of the theory and practice of STEM from introductory to advanced levels, covering the instrument, image formation and scattering theory, and definition and measurement of resolution for both imaging and analysis. The authors will present examples of the use of combined imaging and spectroscopy for solving materials problems in a variety of fields, including condensed matter physics, materials science, catalysis, biology, and nanoscience. Therefore this will be a comprehensive reference for those working in applied fields wishing to use the technique, for graduate students learning microscopy for the first time, and for specialists in other fields of microscopy.
Scanning Tunneling Spectroscopy of Magnetic Bulk Impurities
by Henning PrüserMagnetic impurities in a non-magnetic host metal have been actively explored in condensed matter physics in recent last decades. From both fundamental and applied viewpoints these systems are very interesting because they can exhibit strong electronic correlations that give rise to various fascinating phenomena beyond the single particle picture. Up to now our understanding of the underlying processes remains limited due to difficulties involved in measuring these systems on a microscopic scale. With their unique control, scanning tunneling microscopy (STM) and spectroscopy (STS) allow for the first time investigations of phenomena occurring on very small length and energy scales. Here, single magnetic iron and cobalt atoms embedded beneath a metal surface are investigated using these techniques. In particular, the transition from single impurity Kondo physics to two interacting impurities is studied in real space. This thesis contains a comprehensive description of the STM /STS technique, sub-surface impurities, as well as single- and two-impurity Kondo physics - and as such offers a valuable introduction to newcomers to the field.
Scarcity Brain: Fix Your Craving Mindset and Rewire Your Habits to Thrive with Enough
by Michael Easter&“Reveals the biological and evolutionary foundations behind your brain&’s fixations, so you can stop seeking and start living.&”—Melissa Urban, Whole30 CEO and New York Times bestselling author of The Book of Boundaries &“Michael Easter&’s genius is that he puts data around the edges of what we intuitively believe. His work has inspired many to change their lives for the better.&”—Dr. Peter Attia, #1 New York Times bestselling author of OutliveAre we hardwired to crave more? From food and stuff to information and influence, why can&’t we ever get enough?Michael Easter, author of The Comfort Crisis and one of the world&’s leading experts on behavior change, shows that the problem isn&’t you. The problem is your scarcity mindset, left over from our ancient ancestors. They had to constantly seek and consume to survive because vital survival tools like food, material goods, information, and power were scarce and hard to find. But with our modern ability to easily fulfill our ancient desire for more, our hardwired &“scarcity brain&” is now backfiring. And new technology and institutions—from dating and entertainment apps to our food and economic systems—are exploiting our scarcitybrain. They&’re bombarding us with subversive &“scarcitycues,&” subtle triggers that lead us into low-reward cravings that hurt us in the long run. Scarcity cues can be direct and all-encompassing, like a sagging economy. Or they can be subtle and slight, like our neighbor buying a shiny new car.Easter traveled the world to consult with remarkable innovators and leading scientists who are finding surprising solutions for our scarcity brain. He discovered simple tactics that can move us towards an abundance mindset, cement healthy habits, and allow us to live our lives to the fullest and appreciate what we have, including how to:• Detect hidden scarcity cues to stop cravings before they start, from a brilliant slot machine designer in a Las Vegas casino laboratory• Turn alone time into the ultimate happiness hack, from artisanal coffee-making Benedictine monks• Reignite your exploration gene for a more exciting and fulfilling life, from an astronaut onboard the International Space Station• Reframe how we think about and fix addiction and bad habits, from Iraq&’s chief psychiatrist• Recognize when you have enough, from a woman who left a million-dollar career path to adventure the worldOur world is overloaded with everything we&’re built to crave. The fix for scarcity brain isn&’t to blindly aim for less. It&’s to understand why we crave more in the first place, shake our worst habits, and use what we already have better. Then we can experience life in a new way—a more satisfying way.
The Scarcity Slot: Excavating Histories of Food Security in Ghana (California Studies in Food and Culture #75)
by Amanda L. LoganA free open access ebook is available upon publication. Learn more at www.luminosoa.org.The Scarcity Slot is the first book to critically examine food security in Africa’s deep past. Amanda L. Logan argues that African foodways have been viewed through the lens of ‘the scarcity slot,’ a kind of Othering based on presumed differences in resources. Weaving together archaeological, historical, and environmental data with food ethnography, she advances a new approach to building long-term histories of food security on the continent in order to combat these stereotypes. Focusing on a case study in Banda, Ghana that spans the past six centuries, The Scarcity Slot reveals that people thrived during a severe, centuries-long drought just as Europeans arrived on the coast, with a major decline in food security emerging only recently. This narrative radically challenges how we think about African foodways in the past with major implications for the future.
Scared Little Rabbits
by A. V. GeigerWe stand in a tight cluster, high above the lake. One-by-one, we made our way up the narrow trail from the edge of campus. Now, we wait shoulder to shoulder behind the police tape. Nineteen summer students. All but one. <P><P>When Nora gets accepted into her dream summer program at the prestigious Winthrop Academy, she jumps at the chance to put her coding skills to use. But then a fellow student goes missing-and the tech trail for the crime leads back to Nora. Running scared, Nora must race to clear her name and uncover the sordid truth...or she might be the next to disappear.
Scatter, Adapt, and Remember
by Annalee NewitzIn its 4.5 billion-year history, life on Earth has been almost erased at least half a dozen times: shattered by asteroid impacts, entombed in ice, smothered by methane, and torn apart by unfathomably powerful megavolcanoes. And we know that another global disaster is eventually headed our way. Can we survive it? How?As a species, Homo sapiens is at a crossroads. Study of our planet's turbulent past suggests that we are overdue for a catastrophic disaster, whether caused by nature or by human interference.It's a frightening prospect, as each of the Earth's past major disasters--from meteor strikes to bombardment by cosmic radiation--resulted in a mass extinction, where more than 75 percent of the planet's species died out. But in Scatter, Adapt, and Remember, Annalee Newitz, science journalist and editor of the science Web site io9.com explains that although global disaster is all but inevitable, our chances of long-term species survival are better than ever. Life on Earth has come close to annihilation--humans have, more than once, narrowly avoided extinction just during the last million years--but every single time a few creatures survived, evolving to adapt to the harshest of conditions. This brilliantly speculative work of popular science focuses on humanity's long history of dodging the bullet, as well as on new threats that we may face in years to come. Most important, it explores how scientific breakthroughs today will help us avoid disasters tomorrow. From simulating tsunamis to studying central Turkey's ancient underground cities; from cultivating cyanobacteria for "living cities" to designing space elevators to make space colonies cost-effective; from using math to stop pandemics to studying the remarkable survival strategies of gray whales, scientists and researchers the world over are discovering the keys to long-term resilience and learning how humans can choose life over death. Newitz's remarkable and fascinating journey through the science of mass extinctions is a powerful argument about human ingenuity and our ability to change. In a world populated by doomsday preppers and media commentators obsessively forecasting our demise, Scatter, Adapt, and Remember is a compelling voice of hope. It leads us away from apocalyptic thinking into a future where we live to build a better world--on this planet and perhaps on others. Readers of this book will be equipped scientifically, intellectually, and emotionally to face whatever the future holds.
Scattering Amplitudes and Wilson Loops in Twistor Space
by Mathew Richard BullimoreScattering amplitudes are fundamental and rich observables in quantum field theory. Based on the observation that, for massless particles of spin-one or more, scattering amplitudes are much simpler than expected from traditional Feynman diagram techniques, the broad aim of this work is to understand and exploit this hidden structure. It uses methods from twistor theory to provide new insights into the correspondence between scattering amplitudes in supersymmetric Yang-Mills theory and null polygonal Wilson loops. By additionally exploiting the symmetries of the problem, the author succeeds in developing new ways of computing scattering amplitudes.
Scattering Amplitudes in Gauge Theories
by Johannes M. Henn Jan C. PlefkaAt the fundamental level, the interactions of elementary particles are described by quantum gauge field theory. The quantitative implications of these interactions are captured by scattering amplitudes, traditionally computed using Feynman diagrams. In the past decade tremendous progress has been made in our understanding of and computational abilities with regard to scattering amplitudes in gauge theories, going beyond the traditional textbook approach. These advances build upon on-shell methods that focus on the analytic structure of the amplitudes, as well as on their recently discovered hidden symmetries. In fact, when expressed in suitable variables the amplitudes are much simpler than anticipated and hidden patterns emerge. These modern methods are of increasing importance in phenomenological applications arising from the need for high-precision predictions for the experiments carried out at the Large Hadron Collider, as well as in foundational mathematical physics studies on the S-matrix in quantum field theory. Bridging the gap between introductory courses on quantum field theory and state-of-the-art research, these concise yet self-contained and course-tested lecture notes are well-suited for a one-semester graduate level course or as a self-study guide for anyone interested in fundamental aspects of quantum field theory and its applications. The numerous exercises and solutions included will help readers to embrace and apply the material present ed in the main text.