By focusing on the mostly used variational methods, this monograph aspires to give a unified description and comparison of various ways of constructing conserved quantities for perturbations and to study symmetries in general relativity and modified theories of gravity. The main emphasis lies on the field-theoretical covariant formulation of perturbations, the canonical Noether approach and the Belinfante procedure of symmetrisation. The general formalism is applied to build the gauge-invariant cosmological perturbation theory, conserved currents and superpotentials to describe physically important solutions of gravity theories. Meticulous attention is given to the construction of conserved quantities in asymptotically-flat spacetimes as well as in asymptotically constant curvature spacetimes such as the Anti-de Sitter space. Significant part of the book can be used in graduate courses on conservation laws in general relativity. THE SERIES: DE GRUYTER STUDIES IN MATHEMATICAL PHYSICS The series is devoted to the publication of monographs and high-level texts in mathematical physics. They cover topics and methods in fields of current interest, with an emphasis on didactical presentation. The series will enable readers to understand, apply, and develop further, with sufficient rigor, mathematical methods to given problems in physics. The works in this series are aimed at advanced students and researchers in mathematical and theoretical physics. They can also serve as secondary reading for lectures and seminars at advanced levels.

In early 2010 Russia once again entered a turbulent period. From the system of property distribution, to structure of the political elites and relations between the Center and the regions - various spheres of Russian life are in a state of flux. Two major factors are driving this change: oil prices which are unlikely to grow the way they did in the 2000s and the rapidly deteriorating efficiency of governance. Relations between federal and regional elites, as well as public activism, are derived from these two factors and play an important role of their own. Will change take an evolutionary path or is Russia facing another revolution? The book offers a view of the Russian future until 2025 based on thematic scenarios created by an international team of Russia scholars whose expertise range from politics and economics to demographics and foreign policy.

This book provides a first-ever synthesis of sustainability and sustainable development experiences in the Arctic. It presents state-of-the-art thinking about sustainability for the Arctic from a multi-disciplinary perspective. This book aims to create a comprehensive, integrative knowledge base for the assessment of Arctic sustainability for countries such as the United States, Canada, Greenland, Iceland, Norway, Sweden, Finland, and Russia, alongside emerging ideas about sustainable development in the Arctic. These ideas relate to understanding how a community's geography matters in determining the required sustainability efforts, decolonial thinking for building sustainability that is crafted by and for local and Indigenous communities, and the idea of polycentrism (i.e., that the paths toward sustainability differ among places and communities). This volume also highlights the recent thinking about sustainability and resilience over the past decade for the rapidly changing Arctic region. With patterns of thinking drawn from economic, social, environmental, community, and other components of sustainability; observations and monitoring; engagement of Indigenous knowledge; and integration with policy and decision making, the book helps us understand the complexity and interconnectedness of current Arctic transformations in a more comprehensive way.

Russia 2025 offers a compelling insight into Russia's future by exploring thematic scenarios ranging from politics to demographics. The widening rift between a modernizing, post-Communist society and a paternalistic government will ultimately shape developments in the coming years and will impact on state-society and Center-periphery relations.

The Arctic is one of the world's regions most affected by cultural, socio-economic, environmental, and climatic changes. Over the last two decades, scholars, policymakers, extractive industries, governments, intergovernmental forums, and non-governmental organizations have turned their attention to the Arctic, its peoples, resources, and to the challenges and benefits of impending transformations. Arctic sustainability is an issue of increasing concern as well as the resilience and adaptation of Arctic societies to changing conditions. This book offers key insights into the history, current state of knowledge and the future of sustainability, and sustainable development research in the Arctic. Written by an international, interdisciplinary team of experts, it presents a comprehensive progress report on Arctic sustainability research. It identifies key knowledge gaps and provides salient recommendations for prioritizing research in the next decade. Arctic Sustainability Research will appeal to researchers, academics, and policymakers interested in sustainability science and the practices of sustainable development, as well as those working in polar studies, climate change, political geography, and the history of science.

The Arctic is one of the world's regions most affected by cultural, socio-economic, environmental, and climatic changes. Over the last two decades, scholars, policymakers, extractive industries, governments, intergovernmental forums, and non-governmental organizations have turned their attention to the Arctic, its peoples, resources, and to the challenges and benefits of impending transformations. Arctic sustainability is an issue of increasing concern as well as the resilience and adaptation of Arctic societies to changing conditions. This book offers key insights into the history, current state of knowledge and the future of sustainability, and sustainable development research in the Arctic. Written by an international, interdisciplinary team of experts, it presents a comprehensive progress report on Arctic sustainability research. It identifies key knowledge gaps and provides salient recommendations for prioritizing research in the next decade. Arctic Sustainability Research will appeal to researchers, academics, and policymakers interested in sustainability science and the practices of sustainable development, as well as those working in polar studies, climate change, political geography, and the history of science.

Ivan N. Petrov's The Development of the Bulgarian Literary Language: From Incunabula to First Grammars, Late Fifteenth-Early Seventeenth Century examines the history of the first printed Cyrillic books and their role in the development of the Bulgarian literary language. In the literary culture of the Southern Slavs, especially the Bulgarians, the period that began at the end of the fifteenth century and covered the sixteenth and seventeenth centuries is often seen as a foreshadowing of the pre-national era of modern times. In particular, the centuries-old manuscript tradition was gradually replaced by the Cyrillic printed book, which-after the incunabula of Krakow and Montenegro-was published in such centers as Targoviste, Prague, Venice, Serbian monasteries, Vilnius, Moscow, Zabludow, Lviv, Ostroh, and many others. Petrov shows how the study of old Slavic prints is closely linked to the processes that determined the emergence of modern literary languages in the Slavia Orthodoxa area, including the influence of the liturgical Church Slavonic language shared by the Orthodox Slavs, which was increasingly standardized and codified at that time. The perspective of a language historian brings new light to the complex and multidimensional issues of this important transitional period of Slavic history and culture.