1,874 research outputs found
Reflections on Cosmology: an Outsider's Point of View
Some of the assumptions of cosmology, as based on the simplest version of
General Relativity, are discussed. It is argued that by slight modifications of
standard gravitation theory, our notion of the sources of gravity {the right
hand side of Einstein's equations{, could be something radically different from
what is usually expected. One example is exhibited to prove the point, and some
consequences are discussed
On dB spaces with nondensely defined multiplication operator and the existence of zero-free functions
In this work we consider de Branges spaces where the multiplication operator
by the independent variable is not densely defined. First, we study the
canonical selfadjoint extensions of the multiplication operator as a family of
rank-one perturbations from the viewpoint of the theory of de Branges spaces.
Then, on the basis of the obtained results, we provide new necessary and
sufficient conditions for a real, zero-free function to lie in a de Branges
space.Comment: 13 pages, no fugures. Theorem and remark have been added,
typographical erros correcte
Dispersion Estimates for One-Dimensional Schr\"odinger Equations with Singular Potentials
We derive a dispersion estimate for one-dimensional perturbed radial
Schr\"odinger operators. We also derive several new estimates for solutions of
the underlying differential equation and investigate the behavior of the Jost
function near the edge of the continuous spectrum.Comment: 26 page
Singular Schroedinger operators as self-adjoint extensions of n-entire operators
We investigate the connections between Weyl-Titchmarsh-Kodaira theory for
one-dimensional Schr\"odinger operators and the theory of -entire operators.
As our main result we find a necessary and sufficient condition for a
one-dimensional Schr\"odinger operator to be -entire in terms of square
integrability of derivatives (w.r.t. the spectral parameter) of the Weyl
solution. We also show that this is equivalent to the Weyl function being in a
generalized Herglotz-Nevanlinna class. As an application we show that perturbed
Bessel operators are -entire, improving the previously known conditions on
the perturbation.Comment: 14 page
An Exploratory Study of the Impact of Acculturation on Fashion Consumption Among Hispanic Immigrants in the U.S.
With a population of 58 million in 2016, the Hispanic immigrant population in the U.S. is expected to grow nearly 30% by 2060 (Hispanic influence, 2016). Immigrants are affected by acculturation and often have difficulty maintaining their culture of origin. Prior studies have revealed acculturation influences on consumer behaviors, but despite the increased population and purchasing power of Hispanic immigrants in the U.S., few studies have explored the ways in which acculturation influences shopping behaviors for fashion products among Hispanic consumers. The purpose of this study is to explore the general attitude related to shopping (i.e., shopping orientation) of Hispanic immigrants, the acculturation level of those consumers, and the relationship between acculturation and shopping orientation. A snowball sampling was used to recruit a total of 15 married couples who were born and raised in a Hispanic country and moved to the U.S. after the age of 18. Interviews were conducted in Spanish, lasted about 60 minutes, and asked 20 open-ended questions. During the NVivo analysis process, interview data was categorized into key themes. Interview findings revealed that Hispanic immigrants maintain their original culture while adopting the host culture (i.e., integration). The majority of participants indicated that they prefer buying fashion products in the U.S. due to superior product quality (93%), affordable price (77%), convenient shopping (66%), national brands (63%), and customer service (43%). However, almost 70% of female participants indicated difficulties finding appropriate size and fit when buying clothing in the U.S. Hispanic immigrants tend to shop for clothing in their home countries when they want ethnic designs or leather goods and they are generally quality-conscious, price-conscious, brand-conscious, time-conscious, and recreational shoppers. These findings suggest a positive relationship between the integrated cultural values and shopping orientations of Hispanic immigrant
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