6,622 research outputs found
A note on the uniqueness of the Neumann matrices in the plane-wave background
In this note, we prove the uniqueness of the Neumann matrices of the
open-closed vertex in plane-wave light-cone string-field theory, first derived
for all values of the mass parameter mu in hep-th/0311231. We also prove the
existence and uniqueness of the inverse of an infinite dimensional matrix
necessary for the cubic vertex Neumann matrices, and give an explicit
expression for it in terms of mu-deformed Gamma functions. Methods of complex
analysis are used together with the analytic properties of the mu-deformed
Gamma functions. One of the implications of these results is that the
geometrical continuity conditions suffice to determine the bosonic part of the
vertices as in flat space.Comment: 10 pages, Latex, 2 references adde
Meson Mixing in Pion Superfluid
We investigate meson mixing and meson coupling constants in pion superfluid
in the framework of two flavor NJL model at finite isospin density. The mixing
strength develops fast with increasing isospin chemical potential, and the
coupling constants in normal phase and in the pion superfluid phase behave very
differently.Comment: 6 pages, 4 figures. Updates from version 2: 1, Correct Some language
mistakes and Some errors in the cited references. 2, Rewrite the last
sentence in the summary to indicate a possible way to measure the
isospin-asymmetry related meson propertie
Structural influence on atomic hopping and electronic states of Pd-based bulk metallic glasses
Atomic motion and electronic structures of PdâNiâCuâP bulk metallic glasses were investigated using 31P nuclear magnetic resonance. The hopping rate of P atoms was determined by the stimulated echo technique. Significant hopping was observed in all alloys well below the glass transition temperature. Increasing the Cu content to above 25 at. % increases P hopping significantly, consistent with the previous finding that the openness of the structure increases with Cu content. In contrast, P hopping is not influenced by changes of local electronic states at P sites, induced by the substitution of Ni by Cu
Pion condensation in electrically neutral cold matter with finite baryon density
The possibility of the pion condensation phenomenon in cold and electrically
neutral dense baryonic matter is investigated in -equilibrium. For
simplicity, the consideration is performed in the framework of a NJL model with
two quark flavors at zero current quark mass and for rather small values of the
baryon chemical potential, where the diquark condensation might be ignored. Two
sets of model parameters are used. For the first one, the pion condensed phase
with finite baryon density is realized. In this phase both electrons and the
pion condensate take part in the neutralization of the quark electric charge.
For the second set of model parameters, the pion condensation is impossible if
the neutrality condition is imposed. The behaviour of meson masses vs quark
chemical potential has been studied in electrically neutral matter.Comment: 7 pages; 3 figures; one reference added; to be published in
Eur.Phys.J.
Explicit Formulas for Neumann Coefficients in the Plane-Wave Geometry
We obtain explicit formulas for the Neumann coefficients and associated
quantities that appear in the three-string vertex for type IIB string theory in
a plane-wave background, for any value of the mass parameter mu. The derivation
involves constructing the inverse of a certain infinite-dimensional matrix, in
terms of which the Neumann coefficients previously had been written only
implicitly. We derive asymptotic expansions for large mu and find unexpectedly
simple results, which are valid to all orders in 1/mu. Using BMN duality, these
give predictions for certain gauge theory quantities to all orders in the
modified 't Hooft coupling lambda'. A specific example is presented.Comment: 28 pages, 2 figures, v2: reference added, new comments and appendix,
typos fixed in eqs. (86) and (89
Personalized Predictive ASR for Latency Reduction in Voice Assistants
Streaming Automatic Speech Recognition (ASR) in voice assistants can utilize
prefetching to partially hide the latency of response generation. Prefetching
involves passing a preliminary ASR hypothesis to downstream systems in order to
prefetch and cache a response. If the final ASR hypothesis after endpoint
detection matches the preliminary one, the cached response can be delivered to
the user, thus saving latency. In this paper, we extend this idea by
introducing predictive automatic speech recognition, where we predict the full
utterance from a partially observed utterance, and prefetch the response based
on the predicted utterance. We introduce two personalization approaches and
investigate the tradeoff between potential latency gains from successful
predictions and the cost increase from failed predictions. We evaluate our
methods on an internal voice assistant dataset as well as the public SLURP
dataset.Comment: Accepted for Interspeech 202
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Synthesis and properties of bulk metallic glasses in Pd-Ni-P and Pd-Cu-P alloys
Bulk amorphous Pd-Ni-P and Pd-Cu-P alloy rods with diameters 7-25 mm were synthesized over a wide composition range using a fluxing technique. For most bulk amorphous Pd-Ni-P alloys, the difference {Delta}T=T{sub x}-T{sub g} between the crystallization temperature T{sub x} and the glass transition temperature T{sub g} is larger than 90 K, while for bulk amorphous Pd-Cu-P alloys, {Delta}T varies from 27 to 73 K. Pd{sub 40}Ni{sub 40}P{sub 20} has the highest glass formability, and 300-g bulk amorphous cylinders, 25mm dia and 50mm long, can be easily produced. This size is not an upper limit. The paper presents the glass formation ranges for both ternary alloy systems and data on the thermal stability of the amorphous alloys, as well as their specific heat, density, and elastic properties
Synthesis and Properties of Bulk Metallic Glasses in Pd-Ni-P and Pd-Cu-P Alloys
Bulk amorphous Pd-Ni-P and Pd-Cu-P alloy rods with diameters 7-25 mm were synthesized over a wide composition range using a fluxing technique. For most bulk amorphous Pd-Ni-P alloys, the difference {Delta}T=T{sub x}-T{sub g} between the crystallization temperature T{sub x} and the glass transition temperature T{sub g} is larger than 90 K, while for bulk amorphous Pd-Cu-P alloys, {Delta}T varies from 27 to 73 K. Pd{sub 40}Ni{sub 40}P{sub 20} has the highest glass formability, and 300-g bulk amorphous cylinders, 25mm dia and 50mm long, can be easily produced. This size is not an upper limit. The paper presents the glass formation ranges for both ternary alloy systems and data on the thermal stability of the amorphous alloys, as well as their specific heat, density, and elastic properties
On the Ground State of Two Flavor Color Superconductor
The diquark condensate susceptibility in neutral color superconductor at
moderate baryon density is calculated in the frame of two flavor
Nambu-Jona-Lasinio model. When color chemical potential is introduced to keep
charge neutrality, the diquark condensate susceptibility is negative in the
directions without diquark condensate in color space, which may be regarded as
a signal of the instability of the conventional ground state with only diquark
condensate in the color 3 direction.Comment: 4 pages, 2 figure
Decay Modes of Unstable Strings in Plane-Wave String Field Theory
The cubic interaction vertex of light-cone string field theory in the
plane-wave background has a simple effective form when considering states with
only bosonic excitations. This simple effective interaction vertex is used in
this paper to calculate the three string interaction matrix elements for states
of arbitrary bosonic excitation and these results are used to examine certain
decay modes on the mass-shell. It is shown that the matrix elements of one
string to two string decays involving only bosonic excitations will vanish to
all orders in 1/mu on the mass-shell when the number of excitations on the
initial string is less than or equal to two, but in general will not vanish
when the number of excitations is greater than two. Also, a truncated
calculation of the mass-shell matrix elements for one string to three string
decays of two excitation states is performed and suggests that these matrix
elements do not vanish on the mass-shell. There is, however, a quantitative
discrepancy between this last result and its (also non-vanishing) gauge theory
prediction from the BMN correspondence.Comment: 11 pages; v2: references added; v3: normalization of interaction
vertex and corresponding amplitudes changed by a factor of mu to reflect SFT
normalization (must now divide by mu to compare with BMN dual gauge theory),
and minor errors correcte
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