6,689 research outputs found
Modeling the GeV emission of HESS J0632+057
The binary system HESS J0632+057 was recently detected by {Fermi} to possess
orbital modulated GeV emission. In this paper, we study the possibility that
the compact companion of HESS J0632+057 is a pulsar. Under such a presumption,
we focus on the high energy emission mechanism of this system, which is as
follows. The pulsar companion travels through the circumstellar disc of the
main sequence star twice in each orbit, when some of the matter is
gravity-captured. The captured matter develops an accretion disc around the
pulsar, and the soft photons from which are inverse Compton scattered by the
pulsar wind as the GeV emission from the system. With proper choice of
parameters, SED and light curve which are in accordance with observations can
be produced. We predict that the light curve of GeV emission has two peaks, the
larger one is at around 0.4 after the periastron (or 0.1 after the X-ray
maximum), while the smaller one is between phases 0 and 0.1, with integrated
flux one forth of the larger one.Comment: 7pages, 7 figures. Accepted for publication in MNRA
Inclusive production at factories
Within the nonrelativistic QCD (NRQCD) factorization framework, we
investigate the inclusive production of the meson associated with either
light hadrons or charmed hadrons at factory energy GeV.
Both the leading color-singlet and color-octet channels are included. For the
production associated with light hadrons, the total production rate is
dominated by the color-octet channel, thus the future measurement of this
process may impose useful constraint on the value of the color-octet matrix
element ; for the production associated with
charmed hadrons, the total production rate is about one order of magnitude
smaller, and dominated by the color-singlet channel.Comment: v2, 23 pages, 1 table, 6 figures. Minor corrections, and a note
added, accepted for publication in PR
AAANE: Attention-based Adversarial Autoencoder for Multi-scale Network Embedding
Network embedding represents nodes in a continuous vector space and preserves
structure information from the Network. Existing methods usually adopt a
"one-size-fits-all" approach when concerning multi-scale structure information,
such as first- and second-order proximity of nodes, ignoring the fact that
different scales play different roles in the embedding learning. In this paper,
we propose an Attention-based Adversarial Autoencoder Network Embedding(AAANE)
framework, which promotes the collaboration of different scales and lets them
vote for robust representations. The proposed AAANE consists of two components:
1) Attention-based autoencoder effectively capture the highly non-linear
network structure, which can de-emphasize irrelevant scales during training. 2)
An adversarial regularization guides the autoencoder learn robust
representations by matching the posterior distribution of the latent embeddings
to given prior distribution. This is the first attempt to introduce attention
mechanisms to multi-scale network embedding. Experimental results on real-world
networks show that our learned attention parameters are different for every
network and the proposed approach outperforms existing state-of-the-art
approaches for network embedding.Comment: 8 pages, 5 figure
Note on a non-critical holographic model with a magnetic field
We consider a noncritical holographic model constructed from an intersecting
brane configuration D4/-D4 with an external magnetic field. We
investigate the influences of this magnetic field on strongly coupled dynamics
by the gauge/gravity correspondence.Comment: 18 pages, references added and typos revise
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