37,425 research outputs found
The Lund Model at Nonzero Impact Parameter
We extend the formulation of the longitudinal 1+1 dimensional Lund model to
nonzero impact parameter using the minimal area assumption. Complete formulae
for the string breaking probability and the momenta of the produced mesons are
derived using the string worldsheet Minkowskian helicoid geometry. For strings
stretched into the transverse dimension, we find probability distribution with
slope linear in m_T similar to the statistical models but without any
thermalization assumptions.Comment: 12 pages, 2 .eps figures, footnotes added, results unchanged, version
to be published in Phys.Lett.
The inverse problem for pulsating neutron stars: A ``fingerprint analysis'' for the supranuclear equation of state
We study the problem of detecting, and infering astrophysical information
from, gravitational waves from a pulsating neutron star. We show that the fluid
f and p-modes, as well as the gravitational-wave w-modes may be detectable from
sources in our own galaxy, and investigate how accurately the frequencies and
damping rates of these modes can be infered from a noisy gravitational-wave
data stream. Based on the conclusions of this discussion we propose a strategy
for revealing the supranuclear equation of state using the neutron star
fingerprints: the observed frequencies of an f and a p-mode. We also discuss
how well the source can be located in the sky using observations with several
detectors.Comment: 9 pages, 3 figure
A transmission problem for quasi-linear wave equations
We prove the local existence and uniqueness of solutions to a system of
quasi-linear wave equations involving a jump discontinuity in the lower order
terms. A continuation principle is also established.Comment: The results of this article are essential to a local existence proof
of solutions to the Einstein field equations coupled to elastic matter that
represent gravitating compact bodies. The full existence proof will be
presented in a separate articl
The Spin Distribution of Fast Spinning Neutron Stars in Low Mass X-Ray Binaries: Evidence for Two Sub-Populations
We study the current sample of rapidly rotating neutron stars in both
accreting and non-accreting binaries in order to determine whether the spin
distribution of accreting neutron stars in low-mass X-ray binaries can be
reconciled with current accretion torque models. We perform a statistical
analysis of the spin distributions and show that there is evidence for two
sub-populations among low-mass X-ray binaries, one at relatively low spin
frequency, with an average of ~300 Hz and a broad spread, and a peaked
population at higher frequency with average spin frequency of ~575 Hz. We show
that the two sub-populations are separated by a cut-point at a frequency of
~540 Hz. We also show that the spin frequency of radio millisecond pulsars does
not follow a log-normal distribution and shows no evidence for the existence of
distinct sub-populations. We discuss the uncertainties of different accretion
models and speculate that either the accreting neutron star cut-point marks the
onset of gravitational waves as an efficient mechanism to remove angular
momentum or some of the neutron stars in the fast sub-population do not evolve
into radio millisecond pulsars.Comment: Submitted to Ap
Corporatism and Economic Performance
This paper models corporatism as affecting both the preferences of the parties involved as well as the rules of the game. The analysis is conducted in a union-government game on determining wages and unemployment benefits. The result indicates that international conditions might be important for the functions of the concept of corporatism. It may also serve as an explanation to the poor performance on production and employment in some of the former so successful European corporatist states in the 1990s. The implication of this is that corporatism might not be a successful social organisation in the globalised economy.Corporatism; Interest groups; Labour unions
Inclusion of mussel meal in diets to growing/finishing pigs
This study showed that inclusion of mussel meal in diets to growing/finishing pigs yielded growth rate similar to those obtained with a conventional diet, whereas feed conversion ratio was higher. This implies that mussel meal is a potential alternative protein source that can replace fish and soybean meal in organic diets. By using mussels it would be possible to compose diets with 100% organic feed ingredients. However, mussel meal is currently expensive to produce and in addition more research regarding optimal inclusion level and possible off-flavor of the meat is needed
Human Capital Investment and Globalization in Extortionary States
This paper considers education investment and public education policy in closed and open economies with an extortionary government. The extortionary government in a closed economy chooses an education policy in order to overcome a hold-up problem of time-consistent taxation similar to benevolent governments. The two types of government differ in their education policies if highly productive labor is mobile. Extortionary governments‘ incentives for a policy that stimulates higher private education efforts vanish; instead they have incentives to prevent individuals from mobility-increasing education investment. Tax competition therefore reduces hold-up problems of time-consistent extortionary taxation, but introduces other distortions that reduce workers' utility.migration, education, globalization, commitment, time consistent income taxation, globalisation
Human capital investment and globalization in extortionary states
This paper considers education investment and public education policy in closed and open economies with an extortionary government. The extortionary government in a closed economy chooses an education policy in order to overcome a hold-up problem of time-consistent taxation similar to benevolent governments. The two types of government differ in their education policies if highly productive labor is mobile. Extortionary governments. incentives for a policy that stimulates higher private education efforts vanish; instead they have incentives to prevent individuals from mobility-increasing education investment. Tax competition therefore reduces hold-up problems of time-consistent extortionary taxation, but introduces other distortions that reduce workers. utility. -- In der Arbeit untersuchen wir private und öffentliche Humankapitalinvestitionsentscheidungen in geschlossenen und offenen Volkswirtschaften. Wir unterstellen für die Analyse eine stark eigennutzorientierte Regierung, die versucht, die Nettosteuereinnahmen zu maximieren und diese Einnahmen für Zwecke verausgabt, die nicht den Nutzen der Staatsbürger mehren. Es zeigt sich, dass auch eine solche Regierung in einer geschlossenen Volkswirtschaft öffentliche Bildungsinvestitionen tätigt bzw. private Bildungsinvestitionen subventioniert, weil sie damit ein Problem mangelnder staatlicher Selbstbindung löst. Wir betrachten dann offene Volkswirtschaften, in denen die gutausgebildeten und produktiven Individuen international mobil sind. In der resultierenden Steuerwettbewerbssituation verzichten eigennutzorientierte Regierungen auf öffentliche Bildungsinvestitionen und Bildungssubventionen und versuchen unter Umständen sogar, private Bildungsinvestitionen zu behindern.Migration,education,globalization,commitment,time consistent income taxation
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