498 research outputs found
Massive modes in magnetized brane models
We study higher dimensional models with magnetic fluxes, which can be derived
from superstring theory. We study mass spectrum and wavefunctions of massless
and massive modes for spinor, scalar and vector fields. We compute the 3-point
couplings and higher order couplings among massless modes and massive modes in
4D low-energy effective field theory. These couplings have non-trivial
behaviors, because wavefunctions of massless and massive modes are non-trivial.Comment: 21 page
Flavor structure in D-brane models: Majorana neutrino masses
We study the flavor structure in intersecting D-brane models. We study
anomalies of the discrete flavor symmetries. We analyze the Majorana neutrino
masses, which can be generated by D-brane instanton effects. It is found that a
certain pattern of mass matrix is obtained and the cyclic permutation symmetry
remains unbroken. As a result, trimaximal mixing matrix can be realized if
Dirac neutrino mass and charged lepton mass matrices are diagonal.Comment: 17 pages, 1 figur
Standard Model-like D-brane models and gauge couplings
We systematically search intersecting D-brane models, which just realize the
Standard Model chiral matter contents and gauge symmetry. We construct new
classes of non-supersymmetric Standard Model-like models. We also study gauge
coupling constants of these models. The tree level gauge coupling is a function
of compactification moduli, string scale, string coupling and winding number of
D-branes. By tuning them, we examine whether the models can explain the
experimental values of gauge couplings. As a result, we find that the string
scale should be greater than GeV if the compactification scale and
the string scale are the same order.Comment: 25 pgaes, 12 figures: v2 appendix adde
-cluster excited states in S
-cluster excited states in S are investigated with an extended
Si+ cluster model, in which the Si core deformation and
rotation, and the -cluster breaking are incorporated. In the GCM
calculation with the extended Si+ cluster model, the
-cluster excited states are obtained near the Si+
threshold energy. The Si core deformation and rotation effects, and also
the -clusters breaking in the Si+ system are discussed.
It is found that the rotation of the oblately deformed Si core gives a
significant effect to the -cluster excited states whereas the
-cluster breaking gives only a minor effect
Interactively Picking Real-World Objects with Unconstrained Spoken Language Instructions
Comprehension of spoken natural language is an essential component for robots
to communicate with human effectively. However, handling unconstrained spoken
instructions is challenging due to (1) complex structures including a wide
variety of expressions used in spoken language and (2) inherent ambiguity in
interpretation of human instructions. In this paper, we propose the first
comprehensive system that can handle unconstrained spoken language and is able
to effectively resolve ambiguity in spoken instructions. Specifically, we
integrate deep-learning-based object detection together with natural language
processing technologies to handle unconstrained spoken instructions, and
propose a method for robots to resolve instruction ambiguity through dialogue.
Through our experiments on both a simulated environment as well as a physical
industrial robot arm, we demonstrate the ability of our system to understand
natural instructions from human operators effectively, and how higher success
rates of the object picking task can be achieved through an interactive
clarification process.Comment: 9 pages. International Conference on Robotics and Automation (ICRA)
2018. Accompanying videos are available at the following links:
https://youtu.be/_Uyv1XIUqhk (the system submitted to ICRA-2018) and
http://youtu.be/DGJazkyw0Ws (with improvements after ICRA-2018 submission
Cosmic R-string, R-tube and Vacuum Instability
We show that a cosmic string associated with spontaneous symmetry
breaking gives a constraint for supersymmetric model building. In some models,
the string can be viewed as a tube-like domain wall with a winding number
interpolating a false vacuum and a true vacuum. Such string causes
inhomogeneous decay of the false vacuum to the true vacuum via rapid expansion
of the radius of the tube and hence its formation would be inconsistent with
the present Universe. However, we demonstrate that there exist metastable
solutions which do not expand rapidly. Furthermore, when the true vacua are
degenerate, the structure inside the tube becomes involved. As an example, we
show a "bamboo"-like solution, which suggests a possibility observing an
information of true vacua from outside of the tube through the shape and the
tension of the tube.Comment: 28 pages, 17 figures, v2: references added, improved arguments in sec
3.5.
DIFFERENT POWER AND MUSCULAR ACTMTtES OF THE LOWER UMBS IN THE REBOUND JUMP
The purpose of this study is to clarify the differences in myoelectric activities and power exerting the lower limbs of the performance that is jumping height is high and low people in the rebound jump. The subjects was 23 male students belong to track and field (age : 20.8 i 0.9 years, height : 179.6 * 6.1 an, and body mass : 82.3 * 17.0 kg). The subjects performed five-repeated rebound jump (5RJ), based on the jumping height of the result, divided into jumping high-high group (GOOD) and the low group (POOR), it was compared with the lower limbs joint power and myoelectric activity. As a result, fi was dearly that differences in the performance of GOOD and POOR has become the appropriate preliminary motion that was preactiviation of the lower limbs muscles in the before foot contact and due to the quick action in take off of the first half
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