6,323 research outputs found
Remarks on automorphism and cohomology of finite cyclic coverings of projective spaces
For a smooth finite cyclic covering over a projective space of dimension greater than one, we show that its group of automorphisms faithfully acts on its cohomology except for a few cases. In characteristic zero, we study the equivariant deformation theory and groups of automorphisms for complex cyclic coverings. The proof uses the decomposition of the sheaf of differential forms due to Esnault and Viehweg. In positive characteristic, a lifting criterion of automorphisms reduce the faithfulness problem to characteristic zero. To apply this criterion, we prove the degeneration of the Hodge-de Rham spectral sequences for a family of smooth cfinite yclic coverings, and the infinitesimal Torelli theorem for finite cyclic coverings defined over an arbitrary field
Super-Eddington Accretion as a Possible Scenario to Form GW190425
On 2019 April 25, the LIGO/Virgo Scientific Collaboration detected a compact
binary coalescence, GW190425. Under the assumption of the binary neutron star
(BNS), the total mass of lies five standard
deviations away from the known Galactic population mean. In the standard common
envelope scenario, the immediate progenitor of GW190425 is a close binary
system composed of an NS and a He-rich star. With the detailed binary
evolutionary modeling, we find that in order to reproduce GW190425-like events,
super-Eddington accretion (e.g., ) from a He-rich
star onto the first-born NS with a typical mass of 1.33 via stable
Case BB mass transfer (MT) is necessarily required. Furthermore, the immediate
progenitors should potentially have an initial mass of in a
range of and an initial orbital period of
from 0.08 days to 0.12 days, respectively. The corresponding mass accreted onto
NSs via stable Case BB MT phase varies from to . After the formation of the second-born NS, the BNSs are expected to
be merged due to gravitational wave emission from 11 Myr to 190
Myr.Comment: 8 pages, 10 figures, updated to add one referenc
Acupuncture in Multiple Myeloma Peripheral Neuropathy: A Systematic Review
Chunyi Lyu,1 Hongyan Xiao,1 Xuewei Yin,2 Zonghong Li,1 Chen Han,1 Ruirong Xu3,4 1First Clinical Medical College, Shandong University of Traditional Chinese Medicine, Jinan, 250014, People’s Republic of China; 2Affiliated Eye Hospital of Shandong University of Traditional Chinese Medicine, Jinan, 250002, People’s Republic of China; 3Key Laboratory of Integrated Traditional Chinese and Western Medicine for Hematology, Health Commission of Shandong Province; Institute of Hematology, Shandong University of Traditional Chinese Medicine, Jinan, 250014, People’s Republic of China; 4Department of Hematology, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, 250014, People’s Republic of ChinaCorrespondence: Ruirong Xu, Email [email protected]: Peripheral neuropathy (PN) is a prevalent complication of multiple myeloma (MM), due to the disease itself or its treatment. Despite extensive research, the optimal treatment for multiple myeloma peripheral neuropathy (MMPN) remains unclear. Clinical practice has shown the potential efficacy of acupuncture in managing MMPN. This study aimed to conduct a comprehensive analysis of the literature to assess the effectiveness and safety of acupuncture as a treatment for MMPN.Methods: The PubMed, Web of Science, MEDLINE, Cochrane Library, and Embase databases were comprehensively searched from inception to November 1, 2023 to identify relevant studies pertaining to the use of acupuncture to treat MMPN.Results: A total of five studies, encompassing 97 patients diagnosed with drug-related PN, were ultimately included in this analysis. The literature lacks any reports pertaining to the utilization of acupuncture for disease-related PN. ST36, LI4, SP6, and EX-LE-10 were found to be the most frequently chosen acupoints. Following acupuncture treatment, there was a consistent reduction in scores on the Visual Analogue Scale (VAS), Neuropathic Pain Scale (NPS), Brief Pain Inventory-Short Form (BPI-SF), and Functional Assessment of Cancer Therapy/Gynecologic Oncology Group-Neurotoxicity (FACT/GOG-Ntx) among MMPN patients. The results of Nerve Conduction Velocity (NCV) tests yielded conflicting results. No severe adverse effects were reported.Conclusion: The use of acupuncture for disease-related PN has not been studied to date. Acupuncture is safe for drug-related PN and is helpful for relieving pain. But uncertainty exists regarding the efficacy of this approach because there is substantial heterogeneity with respect to acupuncture treatment regimens, and more high-quality studies on this topic are warranted.Keywords: multiple myeloma peripheral neuropathy, acupuncture, pain, systematic revie
Revisiting the Properties of GW190814 and Its Formation History
GW190814 was reported during LIGO's and Virgo's third observing run with the
most asymmetric component masses (a black hole and a
compact object). Under the assumption that this event is
a binary black hole (BBH) merger formed through the isolated binary evolution
channel, we reanalyze the publicly released data of GW190814 with the modified
astrophysical priors on the effective spin , and further
explore its formation history using detailed binary modeling. We show that
GW190814 is likely to have been formed through the classical common envelope
channel. Our findings show that the properties inferred using the modified
astrophysical priors are consistent with those inferred by the uniform priors.
With the newly-inferred properties of GW190814, we perform detailed binary
evolution of the immediate progenitor of the BBH (namely a close binary system
composed of a BH and a helium star) in a large parameter space, taking into
account mass-loss, internal differential rotation, supernova kicks, and tidal
interactions between the helium star and the BH companion. Our findings show
that GW190814-like events could be formed in limited initial conditions just
after the common envelope phase: a BH and a helium star
of 8.5 at solar metallicity ( 7.5
at 10\% solar metallicity) with an initial orbital period at around
1.0 day. Additionally, the inferred low spin of the secondary indicates that
the required metallicity for reproducing GW190814-like events should not be too
low (e.g., Z 0.1 ).Comment: 8 pages, 8 figures, 1 table, final version published in MNRAN
Search for the decay
We search for radiative decays into a weakly interacting neutral
particle, namely an invisible particle, using the produced through the
process in a data sample of
decays collected by the BESIII detector
at BEPCII. No significant signal is observed. Using a modified frequentist
method, upper limits on the branching fractions are set under different
assumptions of invisible particle masses up to 1.2 . The upper limit corresponding to an invisible particle with zero mass
is 7.0 at the 90\% confidence level
Observation and study of the decay
We report the observation and study of the decay
using events
collected with the BESIII detector. Its branching fraction, including all
possible intermediate states, is measured to be
. We also report evidence for a structure,
denoted as , in the mass spectrum in the GeV/
region. Using two decay modes of the meson ( and
), a simultaneous fit to the mass spectra is
performed. Assuming the quantum numbers of the to be , its
significance is found to be 4.4, with a mass and width of MeV/ and MeV, respectively, and a
product branching fraction
. Alternatively, assuming , the
significance is 3.8, with a mass and width of MeV/ and MeV, respectively, and a product
branching fraction
. The angular distribution of
is studied and the two assumptions of the
cannot be clearly distinguished due to the limited statistics. In all
measurements the first uncertainties are statistical and the second systematic.Comment: 10 pages, 6 figures and 4 table
Precise Measurements of Branching Fractions for Meson Decays to Two Pseudoscalar Mesons
We measure the branching fractions for seven two-body decays to
pseudo-scalar mesons, by analyzing data collected at
GeV with the BESIII detector at the BEPCII collider. The branching fractions
are determined to be ,
,
,
,
,
,
,
where the first uncertainties are statistical, the second are systematic, and
the third are from external input branching fraction of the normalization mode
. Precision of our measurements is significantly improved
compared with that of the current world average values
Measurement of proton electromagnetic form factors in in the energy region 2.00-3.08 GeV
The process of is studied at 22 center-of-mass
energy points () from 2.00 to 3.08 GeV, exploiting 688.5~pb of
data collected with the BESIII detector operating at the BEPCII collider. The
Born cross section~() of is
measured with the energy-scan technique and it is found to be consistent with
previously published data, but with much improved accuracy. In addition, the
electromagnetic form-factor ratio () and the value of the
effective (), electric () and magnetic () form
factors are measured by studying the helicity angle of the proton at 16
center-of-mass energy points. and are determined with
high accuracy, providing uncertainties comparable to data in the space-like
region, and is measured for the first time. We reach unprecedented
accuracy, and precision results in the time-like region provide information to
improve our understanding of the proton inner structure and to test theoretical
models which depend on non-perturbative Quantum Chromodynamics
Measurement of the Cross Section between 600 and 900 MeV Using Initial State Radiation
We extract the cross section in the energy
range between 600 and 900 MeV, exploiting the method of initial state
radiation. A data set with an integrated luminosity of 2.93 fb taken at
a center-of-mass energy of 3.773 GeV with the BESIII detector at the BEPCII
collider is used. The cross section is measured with a systematic uncertainty
of 0.9%. We extract the pion form factor as well as the
contribution of the measured cross section to the leading order hadronic vacuum
polarization contribution to . We find this value to be
.Comment: 14 pages, 7 figures, accepted by PL
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