Aspects of Bottom-up Hidden Sector Models

Aspects of Bottom-up Hidden Sector Models

Author: Philipp Klose

Publisher: Presses universitaires de Louvain

Published: 2020-11-26

Total Pages: 220

ISBN-13: 2390610021

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The standard model (SM) of particle physics is a hugely successful theory of nature, but it is incomplete. E.g., it cannot explain finite SM neutrino masses or the origin of the primordial baryon asymmetry (BAU). One way to address such problems is to postulate the existence of new but hidden particles. This thesis studies such "hidden sectors" in two ways: 1) An effective theory approach, where electroweak (EW) and GeV scale portal effective theories (PETs) are constructed that couple the SM to a generic light hidden mediator of spin 0, 1⁄2, or 1. The EW scale PETs include all portal operators of dimension d≤5. The GeV scale PETs additionally include all leading order (LO) flavour changing portal operators of dimension d≤6,7. They are used to derive a LO PET chiral perturbation theory Lagrangian that describes hidden sector induced light meson transitions in fixed target experiments like NA62 or SHiP. 2) An investigation of the type-I seesaw model, which couples the SM to n≥2 sterile neutrinos that can generate a BAU via “leptogenesis”. It is shown that thermal and spectator effects can result in a sign-flip and strong relative enhancement of the BAU in high-scale leptogenesis with two hierarchical sterile neutrinos of vanishing initial abundance. Much lighter sterile neutrinos may be detected via lepton number violating (LNV) decays at colliders, but LNV decays could be suppressed relative to lepton number conserving decays for 't Hooft natural parameter choices. It is shown that the corresponding parameter space consists of three regions: (a)with unsuppressed LNV decays, (b)with suppressed LNV decays, (c)with suppressed and unsuppressed LNV decays.


Argument in the Greenhouse

Argument in the Greenhouse

Author: Sujata Gupta

Publisher: Routledge

Published: 2005-10-05

Total Pages: 438

ISBN-13: 113475065X

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How can greenhouse gases be controlled and reduced? Will it be in time? This book adds a significant new contribution to the crucial climate change/global warming debate. Incorporating the key political and legal considerations into `real world' applied economic analysis, the authors provide a unique focus on the wider political economy of the problem. All the key issues of controlling climate change (costs, timing and degree of stabilisation, ecological taxt reform, developing countries, and evolution of international agreements), are placed firmly within the current legal and political context, with state-of-the-art economic techniques introduced to analyse different policy proposals. Covering both the developing and developed world, this book identifies important new policies to foster effective agreements on eissions and prevent global warming - realistic policies, likely to receive support at both international and domestic levels. be in time? This book adds a significant new contribution to the crucial climate change/global warming debate. Incorporating the key political and legal considerations into 'real world' applied economic analysis, the book's authors provide a unique focus on the wider political economy of the problem. All the key issues of controlling climate change (costs, timing and degree of stabilisation, ecological tax reform, developing countries and evolution of international agreements), are placed firmly within the current legal and political economy context, with state-of-the-art economic techniques introduced to analyse different policy proposals. Covering both the developing and developed world, this book identifies important new policies to foster effective agreements on emmissions and prevent global warming - realistic policies which are likely to receive support at both international and domestic levels.


String Theory and the Real World: From particle physics to astrophysics

String Theory and the Real World: From particle physics to astrophysics

Author:

Publisher: Elsevier

Published: 2008-07-29

Total Pages: 693

ISBN-13: 0080951511

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This book is a collection of lectures given in July 2007 at the Les Houches Summer School on "String Theory and the Real World: From particle physics to astrophysics." - Provides a pedagogical introduction to topics in String Theory, and Cosmology - Addresses each topic from the basis to the most recent developments - Covers the lectures by internationally-renowned and leading experts


Relativity, Particle Physics And Cosmology - Proceedings Of The Richard Arnowitt Fest

Relativity, Particle Physics And Cosmology - Proceedings Of The Richard Arnowitt Fest

Author: Roland E Allen

Publisher: World Scientific

Published: 1999-02-04

Total Pages: 394

ISBN-13: 981454390X

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This volume outlines the status of fundamental physics at the threshold of the 21st century. Some of the world's leading theorists and experimentalists discuss ongoing research on the following topics: M Theory, Superstring Theory, Supersymmetry and Supergravity, Quantum Gravity, Dark Matter in the Universe, Gravitational Radiation, Proton Decay, Higgs Physics, Cosmology, Bose-Einstein Condensation.


Particles, Strings and Cosmology

Particles, Strings and Cosmology

Author: Kiwoon Choi

Publisher: Springer Science & Business Media

Published: 2005-12-12

Total Pages: 510

ISBN-13: 9780735402959

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PASCOS is an interdisciplinary symposium on the interface of of Particle physics, String theory and Cosmology. Over the past two decades these three disciplines have increasingly become closer. Historically there was always a strong overlap between particle physics and cosmology. This connection has become even stronger with the realization that some of the fundamental issues in cosmology such as the presence of dark matter and dark energy may possibly find a resolution only via new theories of particle physics. At the same time string theory has begun to play an increasingly important role in particle physics as a possible framework for building unified models of particle interaction including gravity. In recent years we have seen an increasing overlap between cosmology and string theory and currently the area of string cosmology is one of the most active fields of research. PASCOS 2005 aimed to provide coherent discussions of recent developments on the interface of the three disciplines and also on their interconnections. In particular, superstring aspects in low energy particle theory (SUSY) and cosmological applications (moduli stabilization) are extensively covered in this volume. Topics include dark matter and dark energy, baryogenesis, flavor and CP violation, neutrino physics, supersymmetry and extra dimensions, flux compactification, string model building, as well as brane cosmology.


Teaching Excellence?

Teaching Excellence?

Author: Andrew Gunn

Publisher: SAGE

Published: 2022-11-30

Total Pages: 121

ISBN-13: 1526484528

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This new title explores the role of teaching within the modern university and the impact of the Teaching Excellence and Student Outcomes Framework (TEF). It provides a critical analysis of recent policy reforms designed to increase competition and choice in higher education and what these mean for the sector. It also surveys the wider landscape and the rise of the student as consumer within HE.


Modeling the Economics of Greenhouse Gas Mitigation

Modeling the Economics of Greenhouse Gas Mitigation

Author: National Research Council

Publisher: National Academies Press

Published: 2011-02-24

Total Pages: 160

ISBN-13: 0309162351

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Models are fundamental for estimating the possible costs and effectiveness of different policies for reducing greenhouse gas (GHG) emissions. There is a wide array of models to perform such analysis, differing in the level of technological detail, treatment of technological progress, spatial and sector details, and representation of the interaction of the energy sector to the overall economy and environment. These differences impact model results, including cost estimates. More fundamentally, these models differ as to how they represent fundamental processes that have a large impact on policy analysis-such as how different models represent technological learning and cost reductions that come through increasing production volumes, or how different models represent baseline conditions. Reliable estimates of the costs and potential impacts on the United States economy of various emissions reduction and other mitigation strategies are critical to the development of the federal climate change research and development portfolio. At the request of the U.S. Department of Energy (DOE), the National Academies organized a workshop, summarized in this volume, to consider some of these types of modeling issues.


Deep Learning for Cognitive Computing Systems

Deep Learning for Cognitive Computing Systems

Author: M.G. Sumithra

Publisher: Walter de Gruyter GmbH & Co KG

Published: 2022-12-31

Total Pages: 214

ISBN-13: 3110750589

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Cognitive computing simulates human thought processes with self-learning algorithms that utilize data mining, pattern recognition, and natural language processing. The integration of deep learning improves the performance of Cognitive computing systems in many applications, helping in utilizing heterogeneous data sets and generating meaningful insights.


Public Administration & Public Management

Public Administration & Public Management

Author: Jan-Erik Lane

Publisher: Routledge

Published: 2006-08-21

Total Pages: 314

ISBN-13: 1134199953

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A perspective on the public sector that presents a concise and comprehensive analysis of exactly what it is and how it operates. Governments in any society deliver a large number of services and goods to their populations. To get the job done, they need public management in order to steer resources – employees, money and laws – into policy outputs and outcomes. In well-ordered societies the teams who work for the state work under a rule-of-law framework, known as public administration. This book covers the key issues of: the principal-agent framework and the public sector public principals and their agents the economic reasons of government public organization, incentives and rationality in government the essence of public administration: legality and the rule of law public policy criteria: the Cambridge and Chicago positions public teams and private teams public firms public insurance public management policy Public Administration & Public Management is essential reading for those with professional and research interests in public administration and public management.