4,742 research outputs found
Entropy/Area spectra of the charged black hole from quasinormal modes
With the new physical interpretation of quasinormal modes proposed by
Maggiore, the quantum area spectra of black holes have been investigated
recently. Adopting the modified Hod's treatment, results show that the area
spectra for black holes are equally spaced and the spacings are in a unified
form, , in Einstein gravity. On the other hand,
following Kunstatter's method, the studies show that the area spectrum for a
nonrotating black hole with no charge is equidistant. And for a rotating (or
charged) black hole, it is also equidistant and independent of the angular
momentum (or charge ) when the black hole is far from the extremal case.
In this paper, we mainly deal with the area spectrum of the stringy charged
Garfinkle-Horowitz-Strominger black hole, originating from effective action
that emerges in the low-energy string theory. We find that both methods give
the same results-that the area spectrum is equally spaced and does not depend
on the charge . Our study may provide new insights into understanding the
area spectrum and entropy spectrum for stringy black holes.Comment: 13 pages, no figure
Domain Wall Brane in Eddington Inspired Born-Infeld Gravity
Recently, inspired by Eddington's theory, an alternative gravity called
Eddington-inspired Born-Infeld gravity was proposed by Baados
and Ferreira. It is equivalent to Einstein's general relativity in vacuum, but
deviates from it when matter is included. Interestingly, it seems that the
cosmological singularities are prevented in this theory. Based on the new
theory, we investigate a thick brane model with a scalar field presenting in
the five-dimensional background. A domain wall solution is obtained, and
further, we find that at low energy the four-dimensional Einstein gravity is
recovered on the brane. Moreover, the stability of gravitational perturbations
is ensured in this model.Comment: 16 pages, 2 figures, improved versio
Using inductive Energy Participation Ratio for Superconducting Quantum Chip Characterization
We have developed an inductive energy participation ratio (iEPR) method and a
concise procedure for superconducting quantum chip layout simulation and
verification that is increasingly indispensable in large-scale, fault-tolerant
quantum computing. It can be utilized to extract the characteristic parameters
and the bare Hamiltonian of the layout in an efficient way. In theory, iEPR
sheds light on the deep-seated relationship between energy distribution and
representation transformation. As a stirring application, we apply it to a
typical quantum chip layout, obtaining all the crucial characteristic
parameters in one step that would be extremely challenging through the existing
methods. Our work is expected to significantly improve the simulation and
verification techniques and takes an essential step toward quantum electronic
design automation
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