1,303 research outputs found
Accounting for the finiteness of the Higgs-boson mass in the 3D Georgi-Glashow model
(2+1)-dimensional Georgi-Glashow model is explored in the regime when the
Higgs boson is not infinitely heavy, but its mass is rather of the same order
of magnitude as the mass of the W boson. In the weak-coupling limit, the Debye
mass of the dual photon and the expression for the monopole potential are
found. The cumulant expansion applied to the average over the Higgs field is
checked to be convergent for the known data on the monopole fugacity. These
results are further generalized to the SU(N)-case. In particular, it is found
that the requirement of convergence of the cumulant expansion establishes a
certain upper bound on the number of colours. This bound, expressed in terms of
the parameter of the weak-coupling approximation, allows the number of colours
to be large enough. Finally, the string tension and the coupling constant of
the so-called rigidity term of the confining string are found at arbitrary
number of colours.Comment: 9 pages, LaTeX2e, no figure
Higgs-inspired corrections to the RG flow in the finite-temperature 3D Georgi-Glashow model and its SU(N)-generalization
The Berezinsky-Kosterlitz-Thouless (BKT) RG flow in the ensemble of monopoles
existing in the finite-temperature (2+1)D Georgi-Glashow model is explored in
the regime when the Higgs field is not infinitely heavy, but its mass is rather
of the same order of magnitude as the mass of the W-boson. The corrections to
the standard RG flow are derived to the leading order in the inverse mass of
the Higgs boson. According to the obtained RG equations, the scaling of the
free-energy density in the critical region and the value of the critical
temperature of the phase transition are found to be unaffected by the
finiteness of the Higgs-boson mass. The evolution of the Higgs mass itself is
also investigated and shown to be rather weak, that enables one to treat this
parameter as a constant. The same analysis is further performed in the
SU(N)-case at N>2, where the RG invariance is demonstrated to hold only
approximately, in a certain sense. Modulo this approximation, the critical
behaviour of the SU(N)-model turns out to be identical to that of the
SU(2)-one.Comment: 12 pages, LaTeX2e, no figure
Hopf Structures on Ambiskew Polynomial Rings
We derive necessary and sufficient conditions for an ambiskew polynomial ring
to have a Hopf algebra structure of a certain type. This construction
generalizes many known Hopf algebras, for example U(sl2), U_q(sl2) and the
enveloping algebra of the 3-dimensional Heisenberg Lie algebra. In a
torsion-free case we describe the finite-dimensional simple modules, in
particular their dimensions and prove a Clebsch-Gordan decomposition theorem
for the tensor product of two simple modules. We construct a Casimir type
operator and prove that any finite-dimensional weight module is semisimple.Comment: 23 page
Exploration-Exploitation Motivations: An Investigation of Biotechnology Firms’ Participation in Academic Consulting
We employ the exploration-exploitation framework to examine how firm-level motivations influence a biotechnology firm’s participation in consulting agreements with university scientists. This study presents hypotheses that explore whether biotechnology firms use consulting agreements as vehicles to explore new knowledge to develop their absorptive capacity and initiate a relationship with a scientist’s university or to exploit their entrepreneurial orientation or formal technology transfer experience. Assessing survey data collected from biotechnology firms, our analysis revealed significant and positive associations for exploration motives; however, the findings were mixed for exploitation motives. The discussion offers theoretical and managerial implications and future research areas
An Examination of Façades of Conformity as a Social Mobility Strategy
This study examines the façade of conformity construct as a social mobility strategy employed by minority employees to enhance their social identity in organizations.  Results from a survey of 102 African Americans employed in higher education indicate that demographic dissimilarity moderates the relationships between both perceived value of diversity and ethnic identity and facades of conformity. The creation of facades of conformity is positively related to work stress, and work stress is negatively related to job satisfaction
A Catalog of Absorption Lines in Eight HST/STIS E230M 1.0 < z < 1.7 Quasar Spectra
We have produced a catalog of line identifications and equivalent width
measurements for all absorption features in eight ultraviolet echelle quasar
spectra. These spectra were selected as having the highest signal-to-noise
among the HST/STIS spectra obtained with the E230M grating. We identify 56
metal-line systems toward the eight quasars, and present plots of detected
transitions, aligned in velocity-space. We found that about 1/4 - 1/3 of the
features in the Lya forest region, redward of the incidence of the Lyb forest,
are metal lines. High ionization transitions are common. We see both O VI and C
IV in 88 - 90% of the metal-line systems for which the spectra cover the
expected wavelength. Si III is seen in 58%, while low ionization absorption in
C II, Si II, and/or Al II is detected in 50% of the systems for which they are
covered. This catalog will facilitate future studies of the Lya forest and of
metal-line systems of various types.Comment: 13 pages, 2 figures, submitted to Monthly Notices of the Royal
Astronomical Society, a complete version with the appendix and all figures is
available at http://www.astro.psu.edu/users/misawa/pub/Paper/qalcat.pdf.g
QSO 0130-4021: A third QSO showing a low Deuterium to Hydrogen Abundance Ratio
We have discovered a third quasar absorption system which is consistent with
a low deuterium to hydrogen abundance ratio, D/H = 3.4 times 10^-5. The z ~ 2.8
partial Lyman limit system towards QSO 0130-4021 provides the strongest
evidence to date against large D/H ratios because the H I absorption, which
consists of a single high column density component with unsaturated high order
Lyman series lines, is readily modeled -- a task which is more complex in other
D/H systems. We have obtained twenty-two hours of spectra from the HIRES
spectrograph on the W.M. Keck telescope, which allow a detailed description of
the Hydrogen. We see excess absorption on the blue wing of the H I Lyman alpha
line, near the expected position of Deuterium. However, we find that Deuterium
cannot explain all of the excess absorption, and hence there must be
contamination by additional absorption, probably H I. This extra H I can
account for most or all of the absorption at the D position, and hence D/H = 0
is allowed. We find an upper limit of D/H < 6.7 times 10^-5 in this system,
consistent with the value of D/H ~ 3.4 times 10^-5 deduced towards QSO
1009+2956 and QSO 1937-1009 by Burles and Tytler (1998a, 1998b). This
absorption system shows only weak metal line absorption, and we estimate [Si/H]
< -2.6 -- indicating that the D/H ratio of the system is likely primordial. All
four of the known high redshift absorption line systems simple enough to
provide useful limits on D are consistent with D/H = 3.4 +/- 0.25 times 10^-5.
Conversely, this QSO provides the third case which is inconsistent with much
larger values.Comment: 18 pages, 5 figures, submitted to Ap
Color Lie rings and PBW deformations of skew group algebras
We investigate color Lie rings over finite group algebras and their universal enveloping algebras. We exhibit these universal enveloping algebras as PBW deformations of skew group algebras: Every color Lie ring over a finite group algebra with a particular Yetter-Drinfeld structure has universal enveloping algebra that is a quantum Drinfeld orbifold algebra. Conversely, every quantum Drinfeld orbifold algebra of a particular type arising from the action of an abelian group is the universal enveloping algebra of some color Lie ring over the group algebra. One consequence is that these quantum Drinfeld orbifold algebras are braided Hopf algebras
The 1000 GeV gamma rays from ms pulsars
The detection of 1000 GeV gamma-rays with the characteristic 6.1 ms periodicity of the radio pulsar PSR 1953 +29 is reported. This result, significant at the 5.4 beta level, provides the first direct evidence for the association of the 6 ms radio pulsar PSR1953+29 with the gamma-ray source 2CG065+0. Extensive observations of the 1.5 ms pulsar PSR 1937 are also reported
The 1000 GeV gamma ray emission from radio pulsars
Radio pulsars have concentrated on long observations of the Crab pulsar and showed that it emits short intense bursts and a persistent weak periodic flux at gamma-ray energies 1000 GeV. It was shown that the light curve of the persistent emission was dominated by a single peak, coincident with the position of the radio and low energy gamma-ray main pulse. The results of a more detailed analysis of the structure of this main pulse are reported following an appraisal of the timing system. It is shown that at energies 1000 GeV the duration of the main pulse is not greater than 0.4 ms, which is less than that seen at all frequencies other than radio. Flux limits for the emission of 1000 GeV gamma-rays by seven other radio pulsars are reporte
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