3,533 research outputs found
Bulk matter fields on two-field thick branes
In this paper we obtain a new solution of a brane made up of a scalar field
coupled to a dilaton. There is a unique parameter in the solution, which
decides the distribution of the energy density and will effect the localization
of bulk matter fields. For free vector fields, we find that the zero mode can
be localized on the brane. And for vector fields coupled with the dilaton via
, the condition for localizing the zero mode is
with with , which
includes the case . While the zero mode for free Kalb-Ramond fields can
not be localized on the brane, if only we introduce a coupling between the
Kalb-Ramond fields and the dilaton via .
When the coupling constant satisfies with or
with , the zero mode for the KR fields can
be localized on the brane. For spin half fermion fields, we consider the
coupling between the fermions
and the background scalars with positive Yukawa coupling . The effective
potentials for both chiral fermions have three types of shapes decided by the
relation between the dilaton-fermion coupling constant and the
parameter . For , the zero mode of left-chiral
fermion can be localized on the brane. While for with
or with , the zero mode for
left-chiral fermion also can be localized.Comment: 22 pages, 8 figures, improved version, accepted by Physical Review
Gravity Localization and Effective Newtonian Potential for Bent Thick Branes
In this letter, we first investigate the gravity localization and mass
spectrum of gravity KK modes on de Sitter and Anti-de Sitter thick branes.
Then, the effective Newtonian gravitational potentials for these bent branes
are discussed by the two typical examples. The corrections of the Newtonian
potential turns out to be at small for both
cases. These corrections are very different from that of the Randall-Sundrum
brane model .Comment: 6 pages, 2 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
High visibility on-chip quantum interference of single surface plasmons
Quantum photonic integrated circuits (QPICs) based on dielectric waveguides
have been widely used in linear optical quantum computation. Recently, surface
plasmons have been introduced to this application because they can confine and
manipulate light beyond the diffraction limit. In this study, the on-chip
quantum interference of two single surface plasmons was achieved using
dielectric-loaded surface-plasmon-polariton waveguides. The high visibility
(greater than 90%) proves the bosonic nature of single plasmons and emphasizes
the feasibility of achieving basic quantum logic gates for linear optical
quantum computation. The effect of intrinsic losses in plasmonic waveguides
with regard to quantum information processing is also discussed. Although the
influence of this effect was negligible in the current experiment, our studies
reveal that such losses can dramatically reduce quantum interference visibility
in certain cases; thus, quantum coherence must be carefully considered when
designing QPIC devices.Comment: 6 pages, 4 figure
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