Relativistic Astrophysics of the Transient Universe

Physics Today, 2011

2016

The possibility that we live in a higher-dimensional world with spatial dimensions greater than three started with the early work of Kaluza and Klein. However, in addressing experimental constraints, early model-builders were forced to compactify these extra dimensions to very tiny scales. With the development of brane-world scenarios, it became possible to consider novel compactifications which allow the extra dimensions to be large or to provide observable effects of these dimensions at experimentally accessible energy scales.

2011

The principles of gauge symmetry and quantization are fundamental to modern understanding of the laws of electromagnetism, weak and strong subatomic forces, and the theory of general relativity. Ideal for graduate students and researchers in theoretical and mathematical physics, this unique book provides a systematic introduction to Hamiltonian mechanics of systems with gauge symmetry. The book reveals how gauge symmetry may lead to a non-trivial geometry of the physical phase space and studies its effect on quantum dynamics by path integral methods. It also covers aspects of Hamiltonian path integral formalism in detail, along with a number of related topics such as the theory of canonical transformations on phase space supermanifolds, non-commutativity of canonical quantization, and elimination of non-physical variables. The discussion is accompanied by numerous detailed examples of dynamical models with gauge symmetries, clearly illustrating the key concepts.

Astronomy & Astrophysics, 2011

Context. Some core-collapse supernovae appear to be hyper-energetic, and a subset of these are aspherical and associated with long GRBs. Aims. We use observations of electromagnetic emission from core-collapse supernovae and GRBs to impose constraints on their free energy source as a prior to searches for their gravitational wave emission. Methods. We review these events based on a finite efficiency for the conversion of spin energy to magnetic winds powering supernovae. Results. We find that some of the hyper-energetic events cannot be powered by the spindown of rapidly rotating proto-neutron stars by virtue of their limited rotational energy. They can, instead, be produced by the spindown of black holes providing a distinct prospect for gravitational-wave emission of interest to LIGO, Virgo, and the LCGT.

Standing at the edge of life's abyss, we seek meaningful order. We commonly find this 'symbolic immortality' in religion, civilization, state and nation. What happens, however, when the nation itself appears mortal? The Mortality and Morality of Nations seeks to answer this question, theoretically and empirically. It argues that mortality makes morality, and right makes might; the nation's sense of a looming abyss informs its quest for a higher moral ground, which, if reached, can bolster its vitality. The book investigates nationalism's promise of moral immortality and its limitations via three case studies: French Canadians, Israeli Jews, and Afrikaners. All three have been insecure about the validity of their identity or the viability of their polity, or both. They have sought partial redress in existential self-legitimation: by the nation, of the nation and for the nation's very existence.

2004

Two-Dimensional Wavelets and their Relatives Two-dimensional wavelets offer a number of advantages over discrete wavelet transforms when processing rapidly varying functions and signals. In particular, they offer benefits for real-time applications such as medical imaging, fluid dynamics, shape recognition, image enhancement and target tracking. This book introduces the reader to 2-D wavelets via 1-D continuous wavelet transforms, and includes a long list of useful applications. The authors then describe in detail the underlying mathematics before moving on to more advanced topics such as matrix geometry of wavelet analysis, three-dimensional wavelets and wavelets on a sphere. Throughout the book, practical applications and illustrative examples are used extensively, ensuring the book's value to engineers, physicists and mathematicians alike.

Combining twenty-six original essays written by an impressive line-up of distinguished physicists and philosophers of physics, this anthology reflects some of the latest thoughts by leading experts on the influence of Bell's theorem on quantum physics. Essays progress from John Bell's character and background, through studies of his main work, and on to more speculative ideas, addressing the controversies surrounding the theorem, and investigating the theorem's meaning and its deep implications for the nature of physical reality. Combined, they present a powerful comment on the undeniable significance of Bell's theorem for the development of ideas in quantum physics over the past 50 years. Questions surrounding the assumptions and significance of Bell's work still inspire discussion in the field of quantum physics. Adding to this with a theoretical and philosophical perspective, this balanced anthology is an indispensable volume for students and researchers interested in the philosophy of physics and the foundations of quantum mechanics.

2003

It is proposed that the baryons in gamma ray burst (GRB) fireballs originate as "pick-up" neutrons that leak in sideways from surrounding baryonic matter and convert to protons in a collision avalanche. The asymptotic Lorentz factor is estimated, and, in the absence of collimation, is shown to be angle dependent. Reasonable agreement is obtained with existing limits on the GRB baryonic component. The charged decay and collision products of the neutrons become ultrarelativistic immediately, and a UHE neutrino burst is produced with an efficiency that can exceed 0.5. Other signatures may include lithium, beryllium and/or boron lines in the supernova remnants associated with GRB's and high polarization of the gamma rays.

Nuclear Physics A, 2009

The γ-ray emission observed in several classes of Galactic and extragalactic astrophysical sources appears to be linked to accreting black holes and rotational powered neutron stars. These systems are prodigious cosmic accelerators, and are also potential sources of the UHE cosmic rays detected by several experiments and VHE neutrinos. We review a recent progress in our understanding of these objects, and demonstrate how recent and future observations can be employed to probe the conditions in the sources.

The Origins of Money in the Iron Age Mediterranean World, 2021

This book shows how money emerged and spread in the eastern Mediterranean, centuries before the invention of coinage. While the invention of coinage in Ancient Lydia around 630 BCE is widely regarded as one of the defining innovations of the ancient world, money itself was never invented. It gained critical weight in the Iron Age (ca. 1200 – 600 BCE) as a social and economic tool, most dominantly in the form of precious metal bullion. This book is the first study to comprehensively engage with the early history of money in the Iron Age Mediterranean, tracing its development in the Levant and the Aegean. Building on a detailed study of precious metal hoards, Elon D. Heymans deploys a wide range of sources, both textual and material, to rethink money's role and origins in the history of the eastern Mediterranean. Color versions of select print images available on the Resources tab (or here: www.cambridge.org/heymans) or in the digital version on Cambridge Core (https://doi.org/10.1017/9781108975322).