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Kanemura, S.,Senaha, E.,Shindou, T. North-Holland Pub. Co 2011 Physics letters: B Vol.706 No.1
We investigate the one-loop effect of new charged scalar bosons on the Higgs potential at finite temperatures in the supersymmetric standard model with four Higgs doublet chiral superfields as well as a pair of charged singlet chiral superfields. In this model, the mass of the lightest Higgs boson h is determined only by the D-term in the Higgs potential at the tree-level, while the triple Higgs boson coupling for hhh can receive a significant radiative correction due to nondecoupling one-loop contributions of the additional charged scalar bosons. We find that the same nondecoupling mechanism can also contribute to realize stronger first order electroweak phase transition than that in the minimal supersymmetric standard model, which is definitely required for a successful scenario of electroweak baryogenesis. Therefore, this model can be a new candidate for a model in which the baryon asymmetry of the Universe is explained at the electroweak scale.
Short-term Prediction of Localized Heavy Rain from Radar Imaging and Machine Learning
Swe Swe Aung,Yu Senaha,Shin Ohsawa,Itaru Nagayama,Shiro Tamaki 대한전자공학회 2018 IEIE Transactions on Smart Processing & Computing Vol.7 No.2
Heavy rainfall has frequently caused serious flooding and landslides, increasing traffic delays in most parts of the world. Consequently, the people in areas battered by heavy rainfall face many hardships. Thus, the negative effects of torrential rainfall always remind researchers to keep seeking the ways to prevent such damage. Therefore, we designed a system for short-term prediction of localized heavy downpours by using radar images coupled with a machine learning method. Here, we introduce a new approach, named dual k-nearest neighbor (dual-kNN), for shortterm rainfall prediction by upgrading the ordinary classification routines of classical k-nearest neighbors (k-NN). dual-kNN is able to maintain highly robust classification of various K values with an advanced simple dual consideration, where observation of a targeted object can be found not only in the specified region but also in other related regions. We conducted experimentations using 2011, 2013, and 2014 data sets collected from the WITH small-dish aviation radar installed on the rooftop of Information Engineering, University of the Ryukyus. Then, we compared the prediction accuracy of our new approach with classical k-NN. It was experimentally confirmed with test cases and simulations that the performance of dual-kNN is more effective than classical k-NN.
Chiang, Cheng-Wei,Senaha, Eibun North-Holland Pub. Co 2017 Physics letters. Section B Vol.774 No.-
<P><B>Abstract</B></P> <P>We study gauge dependence of gravitational waves produced from a first-order phase transition in classical scale-invariant U <SUP> ( 1 ) ′ </SUP> models. Accidental gauge independence of the one-loop effective potential in this class of models is spoiled by including thermal resummation. The gauge artifact in the resummed effective potential propagates to the gravitational wave spectrum and results in one order of magnitude uncertainties in the prediction under a specific gauge choice.</P>
Chiang, Cheng-Wei,Ramsey-Musolf, Michael J.,Senaha, Eibun American Physical Society 2018 Physical Review D Vol.97 No.1
<P>We analyze the theoretical and phenomenological considerations for the electroweak phase transition and dark matter in an extension of the standard model with a complex scalar singlet (cxSM). In contrast with earlier studies, we use a renormalization group improved scalar potential and treat its thermal history in a gauge-invariant manner. We find that the parameter space consistent with a strong first-order electroweak phase transition (SFOEWPT) and present dark matter phenomenological constraints is significantly restricted compared to results of a conventional, gauge-noninvariant analysis. In the simplest variant of the cxSM, recent LUX data and a SFOEWPT require a dark matter mass close to half the mass of the standard model-like Higgs boson. We also comment on various caveats regarding the perturbative treatment of the phase transition dynamics.</P>