554 research outputs found
Zero Modes for the D=11 Membrane and Five-Brane
There exist extremal p-brane solutions of supergravity for
p=2~and~5. In this paper we investigate the zero modes of the membrane and the
five-brane solutions as a first step toward understanding the full quantum
theory of these objects. It is found that both solutions possess the correct
number of normalizable zero modes dictated by supersymmetry.Comment: Minor typos corrected, one reference added, agrees with published
version. 9 RevTeX pages, 1 figure include
Proximity-Coupled Ti/TiN Multilayers for use in Kinetic Inductance Detectors
We apply the superconducting proximity effect in TiN/Ti multi-layer films to
tune the critical temperature, Tc, to within 10 mK with high uniformity (less
than 15 mK spread) across a 75 mm wafer. Reproducible Tc's are obtained from
0.8 - 2.5 K. These films had high resistivities, > 100 uOhm-cm and internal
quality factors for resonators in the GHz range on the order of 100k and
higher. Both trilayers of TiN/Ti/TiN and thicker superlattice films were
prepared, demonstrating a highly controlled process for films over a wide
thickness range. Detectors were fabricated and showed single photon resolution
at 1550 nm. The high uniformity and controllability coupled with the high
quality factor, kinetic inductance, and inertness of TiN make these films ideal
for use in frequency multiplexed kinetic inductance detectors and other
potential applications such as nanowire detectors, transition edge sensors and
associated quantum information applications
Book Reviews
PUBLIC PLANNING AND CONTROL OF URBAN AND LAND DEVELOPMENT. CASES AND MATERIALS. By Donald G. Hagman. St. Paul: West Publishing Co., 1973. Pp. 1208. 10.00.
THE BENCHWARMERS: THE PRIVATE WORLD OF THE POWERFUL FEDERAL JUDGES. By Joseph C. Goulden. New York: Weybright and Talley, 1974. Pp. 375. $12.50
Twenty Years of the Weyl Anomaly
In 1973 two Salam prot\'{e}g\'{e}s (Derek Capper and the author) discovered
that the conformal invariance under Weyl rescalings of the metric tensor
displayed by classical
massless field systems in interaction with gravity no longer survives in the
quantum theory. Since then these Weyl anomalies have found a variety of
applications in black hole physics, cosmology, string theory and statistical
mechanics. We give a nostalgic review. (Talk given at the {\it Salamfest},
ICTP, Trieste, March 1993.)Comment: 43 page
Superstars and Giant Gravitons in M-theory
Following hep-th/0109127, we show that a certain class of BPS naked
singularities (superstars) found in compactifications of M-theory can be
interpreted as being composed of giant gravitons. More specifically, we study
superstars which are asymptotically AdS_7 x S^4 and AdS_4 x S^7 and show that
these field configurations can be interpreted as being sourced by continuous
distributions of spherical M2- and M5-branes, respectively, which carry
internal momenta and have expanded on the spherical component of the
space-time.Comment: 13 page
Exact Absorption Probability in the Extremal Six-Dimensional Dyonic String Background
We show that the minimally coupled massless scalar wave equation in the
background of an six-dimensional extremal dyonic string (or D1-D5 brane
intersection) is exactly solvable, in terms of Mathieu functions. Using this
fact, we calculate absorption probabilities for these scalar waves, and present
the explicit results for the first few low energy corrections to the
leading-order expressions. For a specific tuning of the dyonic charges one can
reach a domain where the low energy absorption probability goes to zero with
inverse powers of the logarithm of the energy. This is a dividing domain
between the regime where the low energy absorption probability approaches zero
with positive powers of energy and the regime where the probability is an
oscillatory function of the logarithm of the energy. By the conjectured AdS/CFT
correspondence, these results shed novel light on the strongly coupled
two-dimensional field theory away from its infrared conformally invariant fixed
point (the strongly coupled ``non-critical'' string).Comment: Latex (3 times), 23 page
Medical Services Premimum Task Force: Tax Reform Proposals for the Province of British Columbia
In the September 2017 B.C. Budget Update, the government announced that MSP premiums would be
eliminated within four years, with advice from a task force of experts on how best to replace the foregone
MSP premium revenue. The MSP Task Force was formed in November 2017 and asked to report by March
31, 2018. The Terms of Reference1 for the Task Force required us to apply the principles of fairness, efficiency,
business competitiveness, simplicity, revenue stability, and progressivity in determining the best way to
replace MSP premium revenues.
On February 1, 2018 we provided the Minister with our Interim Report that described our process and what
we had heard so far. We conducted a thorough review of the B.C. tax system and met with or received input
from 70 individuals and 28 stakeholder groups. The most common theme in the input was that the revenue
should be replaced by a combination of an increase to personal income tax and a payroll tax. Other
suggestions included taxes on unhealthy activities, corporate tax changes, broadening the Provincial Sales
Tax (PST) base, and changing the Home Owner Grant to an income-tested program. Our Interim Report
provided the following initial advice to the Minister:
}} Eliminate premiums and start collecting the replacement revenues all at once without phase-in;
}} Provide reasonable notice to allow employees and employers to prepare for the change; and,
}} Use a combination of measures to mitigate the negative impacts of each individual measure.
In Budget 2018, delivered on February 20, 2018, the Minister announced that MSP premiums would be
eliminated effective January 2020, with foregone revenue offset by the Employer Health Tax, a payroll tax.
The budget document also indicated that the Task Force should continue its work and make recommendations
to improve the progressivity, fairness, and competitiveness of the tax system.
We have built upon some of the ideas we were working on to raise revenue and some observations we
made while reviewing the tax system, but our proposals are now generally intended to be revenue-neutral
rather than ways to raise revenues
Microscopic Entropy of N=2 Extremal Black Holes
String theory is used to compute the microscopic entropy for several examples
of black holes in compactifications with supersymmetry. Agreement with
the Bekenstein-Hawking entropy and the moduli-independent area formula is
found in all cases.Comment: 9 pages, no figures, uses harvma
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