1,408 research outputs found
Reexploration of interacting holographic dark energy model: Cases of interaction term excluding the Hubble parameter
In this paper, we make a deep analysis for the five typical interacting
holographic dark energy models with the interaction terms , , , , and , respectively.
We obtain observational constraints on these models by using the type Ia
supernova data (the Joint Light-curve Analysis sample), the cosmic microwave
background data (Planck 2015 distance priors), the baryon acoustic oscillations
data, and the direct measurement of the Hubble constant. We find that the
values of for all the five models are almost equal
(around~699), indicating that the current observational data equally favor
these IHDE models. In addition, a comparison with the cases of interaction term
involving the Hubble parameter is also made.Comment: 14 pages, 6 figures. arXiv admin note: text overlap with
arXiv:1710.0306
SCAN-MUSIC: An Efficient Super-resolution Algorithm for Single Snapshot Wide-band Line Spectral Estimation
We propose an efficient algorithm for reconstructing one-dimensional
wide-band line spectra from their Fourier data in a bounded interval
. While traditional subspace methods such as MUSIC achieve
super-resolution for closely separated line spectra, their computational cost
is high, particularly for wide-band line spectra. To address this issue, we
proposed a scalable algorithm termed SCAN-MUSIC that scans the spectral domain
using a fixed Gaussian window and then reconstructs the line spectra falling
into the window at each time. For line spectra with cluster structure, we
further refine the proposed algorithm using the annihilating filter technique.
Both algorithms can significantly reduce the computational complexity of the
standard MUSIC algorithm with a moderate loss of resolution. Moreover, in terms
of speed, their performance is comparable to the state-of-the-art algorithms,
while being more reliable for reconstructing line spectra with cluster
structure. The algorithms are supplemented with theoretical analyses of error
estimates, sampling complexity, computational complexity, and computational
limit
Smarr Integral Formula of D-dimensional Stationary Spacetimes in Einstein-\AE ther-Maxwell Theroy
Using the Wald formalism, we investigate the thermodynamics of charged black
holes in D-dimensional stationary spacetimes with or without rotations in
Einstein-\ae ther-Maxwell theory. In particular, assuming the existence of a
scaling symmetry of the action, we obtain the Smarr integral formula, which can
be applied to both Killing and universal horizons. When restricted to
4-dimensional spherically symmetric spacetimes, previous results obtained by a
different method are re-derived.Comment: No figures and tables. Phys. Let. B782 (2018) 723-72
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