5,809 research outputs found
Adiabatic Electroweak Baryogenesis Driven by an Axion-like Particle
An axion-like particle (ALP) offers a new direction in electroweak
baryogenesis because the periodic nature enables it to trigger a strong
first-order phase transition insensitively to the decay constant . For
much above TeV, the ALP-induced electroweak phase transition is approximately
described by adiabatic processes, distinguishing our scenario for electroweak
baryogenesis from the conventional ones. We show that, coupled to the
electroweak anomaly, the ALP can naturally realize spontaneous electroweak
baryogenesis to solve the matter-antimatter asymmetry problem for in the
range between about GeV and GeV. In such an ALP window, the
violation for baryogenesis is totally free from the experimental constraints,
especially from the recently improved limit on the electron electric dipole
moment. Future searches for ALPs could probe our scenario while revealing the
connection between electroweak symmetry breaking and baryogenesis.Comment: 12 pages, 5 figures, appendices added, published versio
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A Reading and Writing Placement Test: Design, Evaluation, and Analysis
Placement tests, along with the growing interest in their validation, have become increasingly important in English as a Second Language programs. To this end, the present paper illustrates procedures in designing a placement test and using it to evaluate students’ language ability by means of statistical analysis. 29 participants from three proficiency levels (beginning, intermediate, and advanced) took reading and writing placement test sections. Students’ performance at each proficiency level was analyzed separately and compared across proficiency levels. In addition, analyses of responses on a survey revealed a relationship between language learning attitudes and behaviors exhibited by the participants and their performance on the placement test. Through close examination of the process of placement test design, evaluation, and analysis, this paper provides practical guidelines for reading and writing placement testing
Contextualizing accumulation by dispossession: the state and high-rise apartment clusters in Gangnam, Seoul
In an effort to contribute to the contemporary debates on accumulation by dispossession (ABD), we argue for a closer attention to the link between the state and ABD. We propose contextualizing ABD within the institutionalization of the process of replacing communal property rights with private property rights. In such institutionalization, the state plays a critical role as the final guarantor of property rights. As such, the sociospatial specificities of the state would strongly influence how ABD unfolds and how it is understood. In the empirical part of this article, we use this approach to focus on a specific type of capitalist state—that is, the developmental state—to examine the emergence of apartment-dominated residential landscapes in Gangnam District, Seoul, in the 1970s through the use of ABD. Key Words: accumulation by dispossession and primitive accumulation of capital, developmental state, Gangnam District, high-rise apartments, Seoul, South Korea, vertical accumulation
Dark matter filtering-out effect during a first-order phase transition
If the mass of dark matter is generated from a cosmological phase transition
involving the nucleation of bubbles, the corresponding bubble walls can filter
out dark matter particles during the phase transition. Only particles with
sufficient momentum to overcome their mass inside the bubbles can pass through
the walls. As a result, the dark matter number density after the phase
transition has a suppression factor , where
is the dark matter mass, and and are the Lorentz
factor and temperature of the incoming fluid in the bubble wall rest frame,
respectively. Under certain assumptions, we show that the filtering-out process
can naturally provide a large suppression consistent with the observed dark
matter density for a wide range of dark matter masses up to the Planck scale.
Since the first-order phase transition is the decisive ingredient in our
mechanism, a new connection is made between heavy dark matter scenarios and
gravitational wave observations.Comment: 6 pages, 2 figures, minor change, presentation improve
Contextual Linear Bandits under Noisy Features: Towards Bayesian Oracles
We study contextual linear bandit problems under uncertainty on features;
they are noisy with missing entries. To address the challenges from the noise,
we analyze Bayesian oracles given observed noisy features. Our Bayesian
analysis finds that the optimal hypothesis can be far from the underlying
realizability function, depending on noise characteristics, which is highly
non-intuitive and does not occur for classical noiseless setups. This implies
that classical approaches cannot guarantee a non-trivial regret bound. We thus
propose an algorithm aiming at the Bayesian oracle from observed information
under this model, achieving regret bound with respect to
feature dimension and time horizon . We demonstrate the proposed
algorithm using synthetic and real-world datasets.Comment: 30 page
Changes in the Outdoor Wear Market: Focused on the South Korean Market
People have become interested in wellness and health, which has led to well-being trends and increased participation in activities. Therefore, the outdoor wear market has shown growth for several years. However, the outdoor wear market of South Korea is becoming saturated. Moreover, Outdoor wear consumers are tired of same design products. The sportswear companies are trying to develop athleisure products. Therefore, it is time to develop outdoor products for emotional approach. According to results, when consumers purchase outdoor wear, they consider the functionality of the materials more than they do when purchasing ordinary clothes. Outdoor wear consumers\u27 pursued images were classified into three types: urban, minimalist, and active. Outdoor wear selection criteria were classified into two types: instrumental function and expressive function. Outdoor wear brands need to qualify their products functionally and meet their segmented consumers\u27 demands by developing products depending on their image from the planning stage
Ciliated muconodular papillary tumor of the lung: The risk of false-positive diagnosis in frozen section
AbstractCiliated muconodular papillary tumor (CMPT) is newly-defined low-grade malignant tumor, characterized as papillary tumor consisting of ciliated columnar, goblet, and basal cells. We present one case of pulmonary peripheral neoplasm misdiagnosed as mucinous adenocarcinoma. Pathologic findings showed, centrally, cystic papillary growth consisting of ciliated columnar, goblet, and basal cells, and peripherally, some tumor cells spread along the adjacent alveolar walls, in a lepidic fashion, and floating in pool of mucin. Tumor cells had bland nuclei, and no mitotic activity was observed. This had been initially misdiagnosed as mucinous adenocarcinoma in frozen section. We reviewed previous articles as well as permanent and frozen slides. In conclusion, in order to reduce the possibility of false positives, it is important to be aware that CMPT is a rare form of peripheral mucin-producing tumor with characteristic histologic findings
Screening and diagnosis of Fabry disease in chronic kidney disease: the important role of globotriaosylsphingosine
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