This volume gives an up-to-date, systematic account of the microscopic theory of Bose-condensed fluids developed since the late 1950s. In contrast to the usual phenomenological discussions of superfluid 4He, the present treatment is built on the pivotal role of the Bose broken symmetry and a Bose condensate. The many-body formalism is developed, with emphasis on the one- and two-particle Green's functions and their relation to the density response function. These are all coupled together by the Bose broken symmetry, which provides the basis for understanding the elementary excitations and response functions in the hydrodynamic and collisionless regions. It also explains the difference between excitations in the superfluid and normal phases. Chapter 4 gives the first critical assessment of the experimental evidence for a Bose condensate in liquid 4He, based on high-momentum neutron scattering data.
The discovery of Bose–Einstein condensation (BEC) in trapped ultracold atomic gases in 1995 has led to an explosion of theoretical and experimental research on the properties of Bose-condensed dilute gases. The first treatment of BEC at finite temperatures, this book presents a thorough account of the theory of two-component dynamics and nonequilibrium behaviour in superfluid Bose gases. It uses a simplified microscopic model to give a clear, explicit account of collective modes in both the collisionless and collision-dominated regions. Major topics such as kinetic equations, local equilibrium and two-fluid hydrodynamics are introduced at an elementary level. Explicit predictions are worked out and linked to experiments. Providing a platform for future experimental and theoretical studies on the finite temperature dynamics of trapped Bose gases, this book is ideal for researchers and graduate students in ultracold atom physics, atomic, molecular and optical physics and condensed matter physics.
A dystopian twist on Edgar Allan Poe's gothic tale finds 17-year-old plague survivor Araby Worth unable to forget the horrors she has witnessed before finding renewal in relationships with two boys, the charismatic proprietor of a rebel club and a sharp-witted revolutionary. 75,000 first printing.
The image of the scrum – a beleaguered politican surrounded by jockeying reporters – is central to our perception of Ottawa. The modern scrum began with the arrival of television, but even in Sir John A. Macdonald’s day, a century earlier, reporters in the parliamentary press gallery had waited outside the prime minister’s office, pen in hand, hoping for a quote for the next edition. The scrum represents the test of wills, the contest of wits, and the battle for control that have characterized the relationship between Canadian prime ministers and journalists for more than 125 years. Scrum Wars chronicles this relationship. It is an anecdotal as well as analytical account, showing how earlier prime ministers like Sir John A. Macdonald and Sir Wilfrid Laurier were able to exercise control over what was written about their administrators, while more recent leaders like John Diefenbaker, Joe Clark, John Turner, and Brian Mulroney often found themselves at the mercy of intense media scrutiny and comment.
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