10,660 research outputs found
Holographic Ricci dark energy: Interacting model and cosmological constraints
We extend the holographic Ricci dark energy model to include some direct,
non-gravitational interaction between dark energy and dark matter. We consider
three phenomenological forms for the interaction term in the model, namely,
is taken proportional to the Hubble expansion rate and the energy densities
of dark sectors (taken to be , , and , respectively). We obtain a uniform analytical solution to
the three interacting models. Furthermore, we constrain the models by using the
latest observational data, including the 557 Union2 type Ia supernovae data,
the cosmic microwave background anisotropy data from the 7-yr WMAP, and the
baryon acoustic oscillation data from the SDSS. We show that in the interacting
models of the holographic Ricci dark energy, a more reasonable value of
will be obtained, and the observations favor a rather strong
coupling between dark energy and dark matter.Comment: 9 pages, 4 figures; to appear in EPJC; typos corrected, published
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Lie symmetry analysis, conservation laws and analytical solutions for chiral nonlinear Schrödinger equation in (2 + 1)-dimensions
In this work, we consider the chiral nonlinear Schrödinger equation in (2 + 1)-dimensions, which describes the envelope of amplitude in many physical media. We employ the Lie symmetry analysis method to study the vector field and the optimal system of the equation. The similarity reductions are analyzed by considering the optimal system. Furthermore, we find the power series solution of the equation with convergence analysis. Based on a new conservation law, we construct the conservation laws of the equation by using the resulting symmetries. 
Value of 3.0 T diffusion-weighted imaging in discriminating thecoma and fibrothecoma from other adnexal solid masses
Induced-charge electroosmosis around conducting and Janus cylinder in microchip
The induced-charge elecetroosmosis around conducting/Janus cylinder with arbitrary Debye thickness is studied numerically, when an direct current weak electric filed is suddenly applied in a confined microchannel. It’s found that there are four large circulations around the conducting cylinder, and the total flux in the microchannel is zero; there are two smaller circulations around the Janus cylinder, and they are compressed to wall. A bulk flux, which has a parabolic relation with the applied electric field, is also predicted
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