2,278 research outputs found

    Is Poland really 'immune' to the spread of cohabitation?

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    Various data have constantly pointed out a low incidence of non-marital unions in Poland (at 1.4-4.9% among all unions). In this paper we demonstrate that these data, coming exclusively from cross-sectional surveys, clearly underestimate the scale of the phenomenon. By exploiting data on partnership histories we show that young Poles have increasingly opted for cohabitation. Consequently, in the years 2004-2006, entries to cohabitation constituted about one third of all first union entries. Consensual unions have traditionally been seen as being more widespread among the lower social strata, but a clear increase in cohabitation has been also been recently observed among groups with higher levels of educational attainment. Although the estimates of cohabitation incidence are far below those observed in Northern and Western Europe, our study suggests that Poland is not as ‘immune’ to the spread of consensual unions as it is commonly believed.cohabitation, Poland, union formation

    Two-orbital Hubbard model vs spin S=1S=1 Heisenberg model: studies on clusters

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    We perform exact numeric calculations for the two-orbital Hubbard model on the four-site cluster. In the limit of large on-site coupling the model becomes equivalent to the spin S=1S=1 Heisenberg model. By comparing energy spectra of these two models, we quantified the range of interaction parameters for which the Heisenberg model satisfactorily reproduces the two-orbital Hubbard model. Then we examined how the spectrum evolves when we are outside of this region, focusing especially on checking of how it is modified when various ways of interatomic hoppings of electrons between different orbitals are taken into account. We finally show how these modifications affect the dependence of specific heat on temperature.Comment: 8 pages, 7 figures, 2 table
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