We reexamine the two-dimensional model of massive fermions interacting with a massless pseudoscalar field via axial-current-pseudoscalar derivative coupling. Performing a canonical field transformation on the Bose field algebra the model is mapped into the Thirring model with an additional vector-current-scalar-derivative interaction (Schroer-Thirring model). The complete bosonized version of the model is presented. The bosonized composite operators of the quantum Hamiltonian are obtained as the leading operators in the Wilson short distance expansions.
The Schwinger model at finite temperature is analyzed using the Thermofield Dynamics formalism. The operator solution due to Lowenstein and Swieca is generalized to the case of finite temperature within the thermofield bosonization approach. The general properties of the statistical-mechanical ensemble averages of observables in the Hilbert subspace of gauge invariant thermal states are discussed. The bare charge and chirality of the Fermi thermofields are screened, giving rise to an infinite number of mutually orthogonal thermal ground states. One consequence of the bare charge and chirality selection rule at finite temperature is that there are innumerably many thermal vacuum states with the same total charge and chirality of the doubled system. The fermion charge and chirality selection rules at finite temperature turn out to imply the existence of a family of thermal theta vacua states parametrized with the same number of parameters as in zero temperature case. We compute the thermal theta-vacuum expectation value of the mass operator and show that the analytic expression of the chiral condensate for any temperature is easily obtained within this approach, as well as, the corresponding high-temperature behavior.
Using the operator approach we reexamine the two-dimensional model describing a massive Fermi field interacting via derivative couplings with two massless Bose fields, one scalar and the other pseudoscalar. Performing a canonical transformation on the Bose field algebra, the Fermi field operator is written in terms of the Mandelstam soliton operator and the derivative-coupling (DC) model is mapped into the massive Thirring model with two vector-current–scalar-derivative interactions (Schroer–Thirring model). The DC model with massless fermions can be mapped into the massless Rothe–Stamatescu model with a Thirring interaction (massless Rothe–Stamatescu–Thirring model). Within the present approach the weak equivalence between the fermionic sector of the DC model and the massive Thirring model is exhibited compactly.
Exceto onde especificado diferentemente, a matéria publicada neste periódico é licenciada sob forma de uma licença Creative Commons -Atribuição 4.
Justificativa e Objetivos:A prevenção em doenças sexualmente transmissíveis é importante, principalmente, quando a doença em questão é o Papilomavírus Humano (HPV), que causa grande mortalidade em mulheres pelo mundo. Conteúdo: Foi realizada uma revisão da literatura em bases de dados da Biblioteca Virtual de Saúde, Lilacs, Scielo, Capes Periódicos na procura de artigos disponibilizados na íntegra em português e inglês publicados entre 1992 e 2015, sendo localizados 411 artigos no total com o uso dos descritores: HPV, prevenção e controle e o diagnóstico, sendo selecionados 35 artigos para o manuscrito. Conclusão: Foi observada a importância dos profissionais de saúde no atendimento às pacientes portadoras do HPV, principalmente na conscientização para um tratamento efetivo, assim, interrompendo a cadeia de transmissão da doença, evitando a evolução da doença e consequentemente os óbitos.
Background and Objectives:The prevention of sexually-transmitted diseases is important, especially when the disease in question is the Human Papilomavirus (HPV), which causes high mortality in women worldwide.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.