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Articles by Valentina Ros
Miss EUA renuncia ao cargo apenas seis meses após assumir o posto; saiba o motivo
A Miss EUA, Noelia Voigt, coroada em novembro de 2023, acabou de renunciar ao seu cargo. Segundo ela, a decisão foi feita em prol do cuidado de sua saúde mental. Em um post feito em suas redes sociais, Noelia anunciou sua decisão e explicou os motivo que a levaram a isso: "Na vida, eu valorizo fortemente a importância de tomar decisões que façam melhor para você e sua saúde mental. Como indivíduos, crescemos experimentando coisas diferentes na vida que nos levam a aprender mais sobre nós mesmos.
Miss EUA, Noelia Voigt, renuncia ao cargo apenas seis meses após assumir o posto para cuidar da saúde mental; entenda
A Miss EUA, Noelia Voigt, coroada em novembro de 2023, acabou de renunciar ao seu cargo. Segundo ela, a decisão foi feita em prol do cuidado de sua saúde mental. Em um post feito em suas redes sociais, Noelia anunciou sua decisão e explicou os motivo que a levaram a isso: “Na vida, eu valorizo fortemente a importância de tomar decisões que façam melhor para você e sua saúde mental. Como indivíduos, crescemos experimentando coisas diferentes na vida que nos levam a aprender mais sobre nós mesmos.
Overlaps between eigenvectors of spiked, correlated random matrices: From matrix principal component analysis to random Gaussian landscapes
We consider pairs of Gaussian orthogonal ensemble matrices which are correlated with each other and subject to additive and multiplicative rank-one perturbations. We focus on the regime of parameters in which the finite-rank perturbations generate outliers in the spectrum of the matrices.
Generalized Lotka-Volterra Equations with Random, Nonreciprocal Interactions: The Typical Number of Equilibria
Abstract We compute the typical number of equilibria of the generalized Lotka-Volterra equations describing species-rich ecosystems with random, nonreciprocal interactions using the replicated Kac-Rice method. We characterize the multiple-equilibria phase by determining the average abundance and similarity between equilibria as a function of their diversity (i.e., of the number of coexisting species) and of the variability of the interactions.
Fluctuation-driven transitions in localized insulators: Intermittent metallicity and path chaos precede delocalization
Abstract We study how interacting localized degrees of freedom are affected by slow thermal fluctuations that change the effective local disorder. We compute the time-averaged (annealed) conductance in the insulating regime and find three distinct insulating phases, separated by two transitions. The first occurs between a nonresonating insulator and an intermittent metal. The average conductance is always dominated by rare temporal fluctuations.
Complex Energy Landscapes in Spiked-Tensor and Simple Glassy Models: Ruggedness, Arrangements of Local Minima, and Phase Transitions
Abstract We study rough high-dimensional landscapes in which an increasingly stronger preference for a given configuration emerges. Such energy landscapes arise in glass physics and inference. In particular, we focus on random Gaussian functions and on the spiked-tensor model and generalizations. We thoroughly analyze the statistical properties of the corresponding landscapes and characterize the associated geometrical phase transitions.
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