53 research outputs found
D3-brane from D-instantons in the hybrid formalism of superstring
A Dp-brane can be regarded as a configuration of infinitely many
D(p-2k)-branes in bosonic string. We will show this property of D-branes in the
superstring case using the hybrid formalism. It is convenient to study the
boundary state for such D-branes to study such property between D-branes. We
show that the boundary state for a D3-brane in a constant self-dual gauge field
background can be expressed in terms of the boundary state for D-instantons in
the hybrid formalism.Comment: 10 pages, minor corrections, reference adde
Unlocking Novel Quantum States: Virasoro-Bogoliubov Transformations in Two Modes
This paper explores the Bogoliubov transformation's extension to two-mode
squeezed states, building on our previous work with Virasoro-squeezing. We
establish the Virasoro-Bogoliubov transformation as a non-linear extension of
the traditional Bogoliubov transformation, creating non-linear two-mode
squeezed states. This research unveils novel quantum states with the potential
for innovative insights in various fields of quantum physics.Comment: 10 page
Quantization of Nambu Brackets from Operator Formalism in Classical Mechanics
The quantization of Nambu brackets is formulated using the approach of
quantum mechanical formulation of classical mechanics. It is shown that the
quantum-momentum operator is defined by the commutation relation between two
variables in Nambu dynamics and that the canonical commutation relation between
the quantum-position operator and the momentum operator is a natural extension
of the Bohr-Sommerfeld quantization for the phase space in Nambu dynamics. As a
concrete example, the Nambu dynamical system of membranes is constructed, and
its quantization is discussed.Comment: 12 page
Fluctuating Non-linear Non-equilibrium System in Terms of Nambu Thermodynamics
It is shown that the structure of non-equilibrium thermodynamic system far
from equilibrium can be captured in terms of a generalized "Nambu dynamics", in
the presence of fluctuation effects in non-equilibrium thermodynamics. As
concrete examples, chemical reaction systems with time oscillation, such as the
Belousov-Zhabotinsky reaction (BZ reaction), are examined. The quantization of
Nambu brackets arises naturally, which is expected to have applications in
other regions such as fluid mechanics and string theory.Comment: 13 pages, 8 figure
Effects of Assisted Reproduction Technology on Placental Imprinted Gene Expression
We used placental tissue to compare the imprinted gene expression of IGF2, H19, KCNQ1OT1, and CDKN1C of singletons conceived via assisted reproduction technology (ART) with that of spontaneously conceived (SC) singletons. Of 989 singletons examined (ART n = 65; SC n = 924), neonatal weight was significantly lower (P < .001)
in the ART group than in the SC group, but placental weight showed no significant difference. Gene expression analyzed by real-time PCR was similar for both groups with appropriate-for-date (AFD) birth weight. H19 expression was suppressed in fetal growth retardation (FGR) cases in the ART and SC groups compared with AFD cases (P < .02 and P < .05, resp.). In contrast, CDKN1C expression was suppressed in FGR cases in the ART group (P < .01), while KCNQ1OT1 expression was hyperexpressed in FGR cases in the SC group (P < .05). As imprinted gene expression patterns differed between the ART and SC groups, we speculate that ART modifies epigenetic status even though the possibilities always exist
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