209 research outputs found
Another definition of an Euler class group of a Noetherian ring
This is the publisher's version, also available electronically from http://projecteuclid.org/euclid.rmjm/1370267187#first-pag
Decomposition of Feynman Integrals on the Maximal Cut by Intersection Numbers
We elaborate on the recent idea of a direct decomposition of Feynman
integrals onto a basis of master integrals on maximal cuts using intersection
numbers. We begin by showing an application of the method to the derivation of
contiguity relations for special functions, such as the Euler beta function,
the Gauss hypergeometric function, and the Appell function.
Then, we apply the new method to decompose Feynman integrals whose maximal cuts
admit 1-form integral representations, including examples that have from two to
an arbitrary number of loops, and/or from zero to an arbitrary number of legs.
Direct constructions of differential equations and dimensional recurrence
relations for Feynman integrals are also discussed. We present two novel
approaches to decomposition-by-intersections in cases where the maximal cuts
admit a 2-form integral representation, with a view towards the extension of
the formalism to -form representations. The decomposition formulae computed
through the use of intersection numbers are directly verified to agree with the
ones obtained using integration-by-parts identities.Comment: 115 pages, 29 figures; references added; additional examples added;
matches published versio
Gravitational Spin-Orbit Hamiltonian at NNNLO in the post-Newtonian framework
We present the result of the spin-orbit interaction Hamiltonian for binary
systems of rotating compact objects with generic spins, up to NNNLO corrections
within the post-Newtonian expansion. The calculation is performed by employing
the effective field theory diagrammatic approach, and it involves Feynman
integrals up to three loops, evaluated within the dimensional regularization
scheme. We apply canonical transformations to eliminate the non-physical
divergences and spurious logarithmic behaviours of the Hamiltonian, and use the
latter to derive the gauge-invariant binding energy and the scattering angle,
in special kinematic regimes.Comment: 28 page
Fruit Characterization of Different Avocado (Persea Americana Mill.) Genotypes in Eastern Mid-hills of Nepal
The total of thirteen different avocado (Persea americana Mill.) genotypes were collected for evaluating the fruit characteristics in the laboratory of Agricultural Research Station, Pakhribas during November 2017. The fully matured fruits from the farmer's field at Patle, Dhankuta were collected. The criteria for selecting the genotypes were fruit weight, fruit length, fruit diameter, seed weight, pulp weight, pulp to fruit ratio and the seed weight percentage. The result suggests the potentiality of the genotypes PAKAV002 and PAKAV010 in most of the evaluated characters as compared to the tested genotypes. The genotypes PAKAV008 and PAKAV007 were disliked as they have 32.59% and 28.39% of seed weight to the total fruit weight. The genotypes PAKAV002 and PAKAV010 had the average fruit weight ranging (307.1 g and 346.8 g), maximum of pulp to fruit ratio 62.34% and 56.97%. Similarly, genotypes PAKAV010 (11.425%), PAKAV013 (11.96%) and PAKAV002 (14.47%) had low seed weight to the total fruit weight which is regarded important factor for avocado selection and evaluation. This result shows that the genotypes PAKAV002 and PAKAV010 should be further evaluated for fruit characteristics and the quality
Gravitoelectric dynamical tides at second post-Newtonian order
We present a gravitoelectric quadrupolar dynamical tidal-interaction
Hamiltonian for a compact binary system, that is valid to second order in the
post-Newtonian expansion. Our derivation uses the diagrammatic effective field
theory approach, and involves Feynman integrals up to two loops, evaluated with
the dimensional regularization scheme. We also derive the effective Hamiltonian
for adiabatic tides, obtained by taking the appropriate limit of the dynamical
effective Hamiltonian, and we check its validity by verifying the complete
Poincar\'e algebra. In the adiabatic limit, we also calculate two
gauge-invariant observables, namely, the binding energy for a circular orbit
and the scattering angle in a hyperbolic scattering. Our results are important
for developing accurate gravitational waveform models for neutron-star binaries
for present and future gravitational-wave observatories.Comment: 20 pages, 2 figures, 1 tabl
Probing spectral and timing properties of the X-ray pulsar RX J0440.9+4431 in the giant outburst of 2022-2023
The X-ray pulsar RX J0440.9+4431 went through a giant outburst in 2022 and
reached a record-high flux of 2.3 Crab, as observed by Swift/BAT. We study the
evolution of different spectral and timing properties of the source using NICER
observations. The pulse period is found to decrease from 208 s to 205 s, and
the pulse profile evolves significantly with energy and luminosity. The
hardness ratio and hardness intensity diagram (HID) show remarkable evolution
during the outburst. The HID turns towards the diagonal branch from the
horizontal branch above a transition (critical) luminosity, suggesting the
presence of two accretion modes. Each NICER spectrum can be described using a
cutoff power law with a blackbody component and a Gaussian at 6.4 keV. At
higher luminosities, an additional Gaussian at 6.67 keV is used. The observed
photon index shows negative and positive correlations with X-ray flux below and
above the critical luminosity, respectively. The evolution of spectral and
timing parameters suggests a possible change in the emission mechanism and
beaming pattern of the pulsar depending on the spectral transition to sub- and
super-critical accretion regimes. Based on the critical luminosity, the
magnetic field of the neutron star can be estimated in the order of 10
or 10 G, assuming different theoretical models. Moreover, the observed
iron emission line evolves from a narrow to a broad feature with luminosity.
Two emission lines originating from neutral and highly ionized Fe atoms were
evident in the spectra around 6.4 keV and 6.67 keV (higher luminosities).Comment: Published in Monthly Notices of the Royal Astronomical Societ
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Development of a facile antibodyâdrug conjugate platform for increased stability and homogeneityâ â Electronic supplementary information (ESI) available: Synthetic schemes and characterization data, experimental procedures, Fig. S1 and S2. See DOI: 10.1039/c6sc05149a Click here for additional data file.
Despite the advances in the design of antibodyâdrug conjugates (ADCs), the search is still ongoing for novel approaches that lead to increased stability and homogeneity of the ADCs. We report, for the first time, an ADC platform technology using a platinum(ii)-based linker that can re-bridge the inter-chain cysteines in the antibody, post-reduction. The strong platinumâsulfur interaction improves the stability of the ADC when compared with a standard maleimide-linked ADC thereby reducing the linkerâdrug exchange with albumin significantly. Moreover, due to the precise conserved locations of cysteines, both homogeneity and site-specificity are simultaneously achieved. Additionally, we demonstrate that our ADCs exhibit increased anticancer efficacy in vitro and in vivo. The Pt-based ADCs can emerge as a simple and exciting proposition to address the limitations of the current ADC linker technologies
Search for new particles in events with energetic jets and large missing transverse momentum in proton-proton collisions at root s=13 TeV
A search is presented for new particles produced at the LHC in proton-proton collisions at root s = 13 TeV, using events with energetic jets and large missing transverse momentum. The analysis is based on a data sample corresponding to an integrated luminosity of 101 fb(-1), collected in 2017-2018 with the CMS detector. Machine learning techniques are used to define separate categories for events with narrow jets from initial-state radiation and events with large-radius jets consistent with a hadronic decay of a W or Z boson. A statistical combination is made with an earlier search based on a data sample of 36 fb(-1), collected in 2016. No significant excess of events is observed with respect to the standard model background expectation determined from control samples in data. The results are interpreted in terms of limits on the branching fraction of an invisible decay of the Higgs boson, as well as constraints on simplified models of dark matter, on first-generation scalar leptoquarks decaying to quarks and neutrinos, and on models with large extra dimensions. Several of the new limits, specifically for spin-1 dark matter mediators, pseudoscalar mediators, colored mediators, and leptoquarks, are the most restrictive to date.Peer reviewe
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