Tag: Spacetime

Free Download Reflections on Spacetime: Foundations, Philosophy, History By John Earman (auth.), U. Majer, H.-J. Schmidt (eds.)
1995 | 165 Pages | ISBN: 9048146127 | PDF | 6 MB
REFLECTIONS ON SPACETIME – FOUNDATIONS, PHILOSOPHY AND HISTORY During the academic year 1992/93, an interdisciplinary research group constituted itself at the Zentrum fUr interdisziplinare Forschung (ZiF) in Bielefeld, Germany, under the title ‘Semantical Aspects of Spacetime Theories’, in which philosophers and physicists worked on topics in the interpretation and history of relativity theory. The present issue consists of contributions resulting from material presented and discussed in the group during the course of that year. The scope of the papers ranges from rather specialised issues arising from general relativity such as the problem of referential indeterminacy, to foundational questions regarding spacetime in the work of Carnap, Weyl and Hilbert. It is well known that the General Theory of Relativity (GTR) admits spacetime models which are ‘exotic’ in the sense that observers could travel into their own past. This poses a number of problems for the physical interpretation of GTR which are also relevant in the philosophy of spacetime. It is not enough to exclude these exotic models simply by stating that we live in a non-exotic universe, because it might be possible to "operate time machines" by actively changing the topology of the future part of spacetime. In his contribution, Earman first reviews the attempts of physicists to prove "chronology protection theorems" (CPTs) which exclude the operation of time machines under reasonable assumptions.

Free Download At the Frontier of Spacetime: Scalar-Tensor Theory, Bells Inequality, Machs Principle, Exotic Smoothness by Torsten Asselmeyer-Maluga
English | PDF (True) | 2016 | 326 Pages | ISBN : 3319312979 | 6.1 MB
In this book, leading theorists present new contributions and reviews addressing longstanding challenges and ongoing progress in spacetime physics.

Free Download Springer Handbook of Spacetime by Abhay Ashtekar, Vesselin Petkov
English | PDF (True) | 2014 | 883 Pages | ISBN : 3642419917 | 25.25 MB
The Springer Handbook of Spacetime is dedicated to the ground-breaking paradigm shifts embodied in the two relativity theories, and describes in detail the profound reshaping of physical sciences they ushered in. It includes in a single volume chapters on foundations, on the underlying mathematics, on physical and astrophysical implications, experimental evidence and cosmological predictions, as well as chapters on efforts to unify general relativity and quantum physics. The Handbook can be used as a desk reference by researchers in a wide variety of fields, not only by specialists in relativity but also by researchers in related areas that either grew out of, or are deeply influenced by, the two relativity theories: cosmology, astronomy and astrophysics, high energy physics, quantum field theory, mathematics, and philosophy of science. It should also serve as a valuable resource for graduate students and young researchers entering these areas, and for instructors who teach courses on these subjects.

Free Download Orthogonality and Spacetime Geometry by Robert Goldblatt
English | PDF | 1987 | 199 Pages | ISBN : 038796519X | 13.3 MB
This book examines the geometrical notion of orthogonality, and shows how to use it as the primitive concept on which to base a metric structure in affine geometry. The subject has a long history, and an extensive literature, but whatever novelty there may be in the study presented here comes from its focus on geometries hav ing lines that are self-orthogonal, or even singular (orthogonal to all lines). The most significant examples concern four-dimensional special-relativistic spacetime (Minkowskian geometry), and its var ious sub-geometries, and these will be prominent throughout. But the project is intended as an exercise in the foundations of geome try that does not presume a knowledge of physics, and so, in order to provide the appropriate intuitive background, an initial chapter has been included that gives a description of the different types of line (timelike, spacelike, lightlike) that occur in spacetime, and the physical meaning of the orthogonality relations that hold between them. The coordinatisation of affine spaces makes use of constructions from projective geometry, including standard results about the ma trix represent ability of certain projective transformations (involu tions, polarities). I have tried to make the work sufficiently self contained that it may be used as the basis for a course at the ad vanced undergraduate level, assuming only an elementary knowledge of linear and abstract algebra.

Free Download Quantum Field Theory in Curved Spacetime and Black Hole Thermodynamics by Robert M. Wald
English | 1994 | ISBN: 0226870278 | 220 Pages | PDF | 20.5 MB
In this book, Robert Wald provides a coherent, pedagogical introduction to the formulation of quantum field theory in curved spacetime.

Free Download Seven Fundamental Concepts in Spacetime Physics (2nd Edition)
English | 2024 | ISBN: 3031497295 | 210 Pages | PDF EPUB (True) | 7 MB
The book presents seven fundamental concepts in spacetime physics mostly by following Hermann Minkowski’s revolutionary ideas summarized in his 1908 lecture "Space and Time." These concepts are: spacetime, inertial and accelerated motion in spacetime physics, the origin and nature of inertia in spacetime physics, relativistic mass, gravitation, gravitational waves, and black holes. They have been selected because they appear to be causing most misconceptions and confusion in spacetime physics. This second edition has been revised to include additional clarifications, more detailed elaboration of the arguments and also new material published in the interim.

Free Download Chronotropics: Caribbean Women Writing Spacetime by Odile Ferly, Tegan Zimmerman
English | PDF EPUB (True) | 2023 | 318 Pages | ISBN : 3031321103 | 7.5 MB
This book deconstructs androcentric approaches to spacetime inherited from western modernity through its theoretical frame of the chronotropics. It sheds light on the literary acts of archival disruption, radical remapping, and epistemic marronnage by twenty-first-century Caribbean women writers to restore a connection to spacetime, expanding it within and beyond the region. Arguing that the chronotropics points to a vocation for social justice and collective healing, this pan-Caribbean volume returns to autochthonous ontologies and epistemologies to propose a poetics and politics of the chronotropics that is anticolonial, gender inclusive, pluralistic, and non-anthropocentric.

Free Download Global Spacetime Structure
English | 2020 | ISBN: 1108819532 | 92 Pages | PDF (True) | 3 MB
This exploration of the global structure of spacetime within the context of general relativity examines the causal and singular structures of spacetime, revealing some of the curious possibilities that are compatible with the theory, such as ‘time travel’ and ‘holes’ of various types. Investigations into the epistemic and modal structures of spacetime highlight the difficulties in ruling out such possibilities, unlikely as they may seem at first. The upshot seems to be that what counts as a ‘physically reasonable’ spacetime structure in modern physics is far from clear.

Free Download Gravitational Waves: How Einstein’s Spacetime Ripples Reveal the Secrets of the Universe by Brian Clegg, James Gillies, Dreamscape Media, LLC
English | 2022 | ISBN: N/A | ASIN: B093J486QK | MP3@64 kbps | 4 hours and 52 minutes | 134 Mb
On September 14, 2015, after 50 years of searching, gravitational waves were detected for the first time, and astronomy changed forever. Up until then, investigation of the universe had depended on electromagnetic radiation: visible light, radio, X-rays, and the rest. But gravitational waves – ripples in the fabric of space and time – are unrelenting, passing through barriers that stop light dead. At the two two-and-a-half-mile-long LIGO observatories in the US, scientists developed incredibly sensitive detectors, capable of spotting a movement 100 times smaller than the nucleus of an atom. In 2015, they spotted the ripples produced by two black holes spiraling into each other, setting spacetime quivering. This was the first time black holes had ever been directly detected – and it promises far more for the future of astronomy.

(more…)