464 research outputs found
Stokes matrices for the quantum differential equations of some Fano varieties
The classical Stokes matrices for the quantum differential equation of
projective n-space are computed, using multisummation and the so-called
monodromy identity. Thus, we recover the results of D. Guzzetti that confirm
Dubrovin's conjecture for projective spaces. The same method yields explicit
formulas for the Stokes matrices of the quantum differential equations of
smooth Fano hypersurfaces in projective n-space and for weighted projective
spaces.Comment: 20 pages. Introduction has been changed. Small corrections in the
tex
Mirage in Temporal Correlation functions for Baryon-Baryon Interactions in Lattice QCD
Single state saturation of the temporal correlation function is a key
condition to extract physical observables such as energies and matrix elements
of hadrons from lattice QCD simulations. A method commonly employed to check
the saturation is to seek for a plateau of the observables for large Euclidean
time. Identifying the plateau in the cases having nearby states, however, is
non-trivial and one may even be misled by a fake plateau. Such a situation
takes place typically for the system with two or more baryons. In this study,
we demonstrate explicitly the danger from a possible fake plateau in the
temporal correlation functions mainly for two baryons ( and ), and
three and four baryons ( and as well, employing
(2+1)-flavor lattice QCD at GeV on four lattice volumes with
2.9, 3.6, 4.3 and 5.8 fm. Caution is given for drawing conclusion on the
bound , and systems only based on the temporal correlation
functions.Comment: 32 pages, 13 figures, minor corrections, published version, typos
correcte
A terahertz vibrational molecular clock with systematic uncertainty at the level
Neutral quantum absorbers in optical lattices have emerged as a leading
platform for achieving clocks with exquisite spectroscopic resolution. However,
the studies of these clocks and their systematic shifts have so far been
limited to atoms. Here, we extend this architecture to an ensemble of diatomic
molecules and experimentally realize an accurate lattice clock based on pure
molecular vibration. We evaluate the leading systematics, including the
characterization of nonlinear trap-induced light shifts, achieving a total
systematic uncertainty of . The absolute frequency of the
vibrational splitting is measured to be 31 825 183 207 592.8(5.1) Hz, enabling
the dissociation energy of our molecule to be determined with record accuracy.
Our results represent an important milestone in molecular spectroscopy and
THz-frequency standards, and may be generalized to other neutral molecular
species with applications for fundamental physics, including tests of molecular
quantum electrodynamics and the search for new interactions.Comment: 17 pages, 8 figure
'I thought if I marry the prophet I would not die': The significance of religious affiliation on marriage, HIV testing, and reproductive health practices among young married women in Zimbabwe
Published ArticleThis study examines the association between religious affiliation and reasons for marriage, perceived church attitudes, and
reproductive health-seeking behaviors, including HIV testing, among young women in eastern rural Zimbabwe. The sample
comprised women (N ¼ 35) who had married by 2012 while participating in a larger randomized controlled trial (RCT) to test
the effects of school support on HIV-related risk. The RCT sample was identified in 2007 as all female sixth graders in 25 rural
eastern Zimbabwe primary schools whose parents, one or both, had died (N ¼ 328). In our previous RCT analyses, we found
that participants who affiliated with an Apostolic church were more than four times more likely to marry than those from non-
Apostolic churches and that control group participants were twice as likely to marry as those in the intervention group. Other
studies had found that marriage greatly increased the odds of HIV infection among adolescent women. Given the link between
Apostolic affiliation and marriage, we conducted semi-structured interviews to explore type of marriage, reasons for marrying,
church affiliation and attitudes, family planning, HIV testing, schooling, and family life. We were interested in differences, as
perceived by our sample of young married women congregants, among Apostolic sects and other denominations in their
attitudes about marriage and health-seeking behaviors. We were also interested in the influence of church affiliation on
intervention participants’ decision to marry, since they had comprehensive school support and education is highly valued in
Zimbabwe, but costly and often out of financial reach. Interviews were conducted from October 2012 through November 2013;
data were analyzed using a general inductive approach. We found that pressure or perceived deception for coitus or marriage
was reported only by intervention participants affiliated with Apostolic denominations. Other reasons for marriage were similar
between Apostolic and non-Apostolic adherents, as well as intervention and control conditions. All participants believed HIV
testing was important, but while all non-Apostolic denominations encouraged HIV testing and clinic/hospital care, there was
considerable heterogeneity in attitudes among Apostolics, with ultraconservative denominations most likely to proscribe nonreligious
health care. We conclude that some, but not all, Apostolic-affiliated women are afforded discretion in their healthseeking
behaviors. Since HIV screening and treatment depend on access to clinic/hospital care, continued public health efforts
to engage Apostolic leaders is needed, along with monitoring of progress in access and outcomes
Lagrangian Floer superpotentials and crepant resolutions for toric orbifolds
We investigate the relationship between the Lagrangian Floer superpotentials
for a toric orbifold and its toric crepant resolutions. More specifically, we
study an open string version of the crepant resolution conjecture (CRC) which
states that the Lagrangian Floer superpotential of a Gorenstein toric orbifold
and that of its toric crepant resolution coincide after
analytic continuation of quantum parameters and a change of variables. Relating
this conjecture with the closed CRC, we find that the change of variable
formula which appears in closed CRC can be explained by relations between open
(orbifold) Gromov-Witten invariants. We also discover a geometric explanation
(in terms of virtual counting of stable orbi-discs) for the specialization of
quantum parameters to roots of unity which appears in Y. Ruan's original CRC
["The cohomology ring of crepant resolutions of orbifolds", Gromov-Witten
theory of spin curves and orbifolds, 117-126, Contemp. Math., 403, Amer. Math.
Soc., Providence, RI, 2006]. We prove the open CRC for the weighted projective
spaces using an equality between open
and closed orbifold Gromov-Witten invariants. Along the way, we also prove an
open mirror theorem for these toric orbifolds.Comment: 48 pages, 1 figure; v2: references added and updated, final version,
to appear in CM
Mirror Map as Generating Function of Intersection Numbers: Toric Manifolds with Two K\"ahler Forms
In this paper, we extend our geometrical derivation of expansion coefficients
of mirror maps by localization computation to the case of toric manifolds with
two K\"ahler forms. Especially, we take Hirzebruch surfaces F_{0}, F_{3} and
Calabi-Yau hypersurface in weighted projective space P(1,1,2,2,2) as examples.
We expect that our results can be easily generalized to arbitrary toric
manifold.Comment: 45 pages, 2 figures, minor errors are corrected, English is refined.
Section 1 and Section 2 are enlarged. Especially in Section 2, confusion
between the notion of resolution and the notion of compactification is
resolved. Computation under non-zero equivariant parameters are added in
Section
Enumerative aspects of the Gross-Siebert program
We present enumerative aspects of the Gross-Siebert program in this
introductory survey. After sketching the program's main themes and goals, we
review the basic definitions and results of logarithmic and tropical geometry.
We give examples and a proof for counting algebraic curves via tropical curves.
To illustrate an application of tropical geometry and the Gross-Siebert program
to mirror symmetry, we discuss the mirror symmetry of the projective plane.Comment: A version of these notes will appear as a chapter in an upcoming
Fields Institute volume. 81 page
Unified ethical principles and an animal research ‘Helsinki’ declaration as foundations for international collaboration
Ethical frameworks are the foundation for any research with humans or nonhuman animals. Human research is
guided by overarching international ethical principles, such as those defined in the Helsinki Declaration by the
World Medical Association. However, for nonhuman animal research, because there are several sets of ethical
principles and national frameworks, it is commonly thought that there is substantial variability in animal
research approaches internationally and a lack of an animal research ‘Helsinki Declaration’, or the basis for one.
We first overview several prominent sets of ethical principles, including the 3Rs, 3Ss, 3Vs, 4Fs and 6Ps. Then
using the 3Rs principles, originally proposed by Russell & Burch, we critically assess them, asking if they can be
Replaced, Reduced or Refined. We find that the 3Rs principles have survived several replacement challenges, and
the different sets of principles (3Ss, 3Vs, 4Fs and 6Ps) are complementary, a natural refinement of the 3Rs and are
ripe for integration into a unified set of principles, as proposed here. We also overview international frameworks
and documents, many of which incorporate the 3Rs, including the Basel Declaration on animal research. Finally,
we propose that the available animal research guidance documents across countries can be consolidated, to
provide a similar structure as seen in the Helsinki Declaration, potentially as part of an amended Basel Declaration on animal research. In summary, we observe substantially greater agreement on and the possibility for
unification of the sets of ethical principles and documents that can guide animal research internationally
Landau-Ginzburg/Calabi-Yau correspondence, global mirror symmetry and Orlov equivalence
We show that the Gromov-Witten theory of Calabi-Yau hypersurfaces matches, in
genus zero and after an analytic continuation, the quantum singularity theory
(FJRW theory) recently introduced by Fan, Jarvis and Ruan following ideas of
Witten. Moreover, on both sides, we highlight two remarkable integral local
systems arising from the common formalism of Gamma-integral structures applied
to the derived category of the hypersurface {W=0} and to the category of graded
matrix factorizations of W. In this setup, we prove that the analytic
continuation matches Orlov equivalence between the two above categories.Comment: 72pages, v2: Appendix B and references added. Typos corrected, v3:
several mistakes corrected, final versio
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