A local hidden variable theory for the GHZ experiment

A recent analysis by de Barros and Suppes of experimentally realizable GHZ correlations supports the conclusion that these correlations cannot be explained by introducing local hidden variables. We show, nevertheless, that their analysis does not exclude local hidden variable models in which the inefficiency in the experiment is an effect not only of random errors in the detector equipment, but is also the manifestation of a pre-set, hidden property of the particles ("prism models"). Indeed, we present an explicit prism model for the GHZ scenario; that is, a local hidden variable model entirely compatible with recent GHZ experiments.Comment: 17 pages, LaTeX, 7 eps figures, computer demo: http://hps.elte.hu/~leszabo/GHZ.html, an improper figure is replace

Penalized or Privileged? Sexual Identity, Gender, and Postsecondary Educational Attainment

Citation: Fine, L. E. (2015). Penalized or Privileged? Sexual Identity, Gender, and Postsecondary Educational Attainment. American Journal of Education, 121(2), 271-297. doi:10.1086/679393Prior literature on educational attainment indicates that there is both a female advantage and an LGB bonus: women are more likely to have earned bachelor's degrees than men, and lesbian, gay, and bisexual (LGB) persons are more likely to have earned a bachelor's degree than heterosexuals. Using data from the National Longitudinal Survey of Adolescent Health, I run logistic regressions on respondents' likelihood of having a bachelor's degree as a function of both gender and sexuality. I find that the female advantage and LGB bonus do not hold for sexual minority women, who are the gender and sexuality group least likely to have completed college

Safe Is Not Enough: Better Schools for LGBTQ Students

Citation: Fine, L. E. (2017). Safe Is Not Enough: Better Schools for LGBTQ Students. American Journal of Education, 123(3), 517-521. Retrieved from ://WOS:000399665200007The preponderance of literature related to LGBTQ youth prior to the mid-2000s tended to focus on the ways in which claiming a minority sexual or gender identity led to persistent disadvantage in American society. Schools in particular were found to be spaces where homophobia and transphobia were omnipresent, leaving queer young people with low self-esteem, high levels of fear, and numerous reports of vicitimization (D’Augelli et al. 2001; van Wormer and McKinney 2003). Since the mid-2000s, though, a new stream of literature has begun to explore the ways in which LGBTQ youth are resilient and in what contexts they thrive (McCormack 2012; Savin-Williams 2005). Michael Sadowski’s book Safe Is Not Enough: Better Schools for LGBTQ Students is an important contribution to the latter tradition

A quantum group version of quantum gauge theories in two dimensions

For the special case of the quantum group $SL_q (2,{\bf C})\ (q= \exp \pi i/r,\ r\ge 3)$ we present an alternative approach to quantum gauge theories in two dimensions. We exhibit the similarities to Witten's combinatorial approach which is based on ideas of Migdal. The main ingredient is the Turaev-Viro combinatorial construction of topological invariants of closed, compact 3-manifolds and its extension to arbitrary compact 3-manifolds as given by the authors in collaboration with W. Mueller.Comment: 6 pages (plain TeX

Phase separation in the vicinity of "quantum critical" doping concentration: implications for high temperature superconductors

A general quantitative measure of the tendency towards phase separation is introduced for systems exhibiting phase transitions or crossovers controlled by charge carrier concentration. This measure is devised for the situations when the quantitative knowledge of various contributions to free energy is incomplete, and is applied to evaluate the chances of electronic phase separation associated with the onset of antiferromagnetic correlations in high-temperature cuprate superconductors. The experimental phenomenology of lanthanum- and yittrium-based cuprates was used as input to this analysis. It is also pointed out that Coulomb repulsion between charge carriers separated by the distances of 1-3 lattice periods strengthens the tendency towards phase separation by accelerating the decay of antiferromagnetic correlations with doping. Overall, the present analysis indicates that cuprates are realistically close to the threshold of phase separation -- nanoscale limited or even macroscopic with charge density varying between adjacent crystal planes

Sets Represented as the Length-n Factors of a Word

In this paper we consider the following problems: how many different subsets of Sigma^n can occur as set of all length-n factors of a finite word? If a subset is representable, how long a word do we need to represent it? How many such subsets are represented by words of length t? For the first problem, we give upper and lower bounds of the form alpha^(2^n) in the binary case. For the second problem, we give a weak upper bound and some experimental data. For the third problem, we give a closed-form formula in the case where n <= t < 2n. Algorithmic variants of these problems have previously been studied under the name "shortest common superstring"

Amplitude dynamics of charge density wave in LaTe3_3: theoretical description of pump-probe experiments

We formulate a dynamical model to describe a photo-induced charge density wave (CDW) quench transition and apply it to recent multi-probe experiments on LaTe$_3$ [A. Zong et al., Nat. Phys. 15, 27 (2019)]. Our approach relies on coupled time-dependent Ginzburg-Landau equations tracking two order parameters that represent the modulations of the electronic density and the ionic positions. We aim at describing the amplitude of the order parameters under the assumption that they are homogeneous in space. This description is supplemented by a three-temperature model, which treats separately the electronic temperature, temperature of the lattice phonons with stronger couplings to the electronic subsystem, and temperature of all other phonons. The broad scope of available data for LaTe$_3$ and similar materials as well as the synergy between different time-resolved spectroscopies allow us to extract model parameters. The resulting calculations are in good agreement with ultra-fast electron diffraction experiments, reproducing qualitative and quantitative features of the CDW amplitude evolution during the initial few picoseconds after photoexcitation.Comment: 21 pages, 14 figures; this version is almost identical to the published version; comparing to the earlier arXiv submission, current version contains a new figure (Fig.10), and a broader discussion of theoretical results and approximation