Nature of the spin-glass phase at experimental length scales

We present a massive equilibrium simulation of the three-dimensional Ising spin glass at low temperatures. The Janus special-purpose computer has allowed us to equilibrate, using parallel tempering, L = 32 lattices down to T ≈ 0.64Tc. We demonstrate the relevance of equilibrium finite-size simulations to understand experimental non-equilibrium spin glasses in the thermodynamical limit by establishing a time-length dictionary. We conclude that non-equilibrium experiments performed on a time scale of one hour can be matched with equilibrium results on L ≈ 110 lattices. A detailed investigation of the probability distribution functions of the spin and link overlap, as well as of their correlation functions, shows that Replica Symmetry Breaking is the appropriate theoretical framework for the physically relevant length scales. Besides, we improve over existing methodologies to ensure equilibration in parallel tempering simulations.

Fundamental limitations in the purifications of tensor networks

We show a fundamental limitation in the description of quantum many-body mixed states with tensor networks in purification form. Namely, we show that there exist mixed states which can be represented as a translationally invariant (TI) matrix product density operator valid for all system sizes, but for which there does not exist a TI purification valid for all system sizes. The proof is based on an undecidable problem and on the uniqueness of canonical forms of matrix product states. The result also holds for classical states.

Nonequilibrium spin glass dynamics with Janus

The out of equilibrium evolution for an Edwards‐Anderson spin glass is followed for a tenth of a second, a long enough time to let us make safe predictions about the behaviour at experimental scales. This work has been made possible by Janus, an FPGA based special purpose computer. We have thoroughly studied the spin glass correlation functions and the growth of the coherence length for L = 80 lattices in 3D. Our main conclusion is that these spin glasses follow noncoarsening dynamics, at least up to the experimentally relevant time scales.

Análisis de la respuesta educativa desde la escuela a los menores en acogimiento residencial: un estudio de caso en la Comunidad de Madrid

The reality of children living in foster homes is clearly linked to the professionals that surround them both in the educational and residentialsphere. These are children who in all aspects of their livesat all hours, are exposed to the professionalism of those who work with them and not the affection of a family; their development is fully mediated by institutions. It is therefore a priority that teachers have specific training on children living infoster care, that general government (Education and Social Services) provide guidelines for action agreed to allow the coordination between the different professionals involved with children in foster care, considering the complexity of this coordination, as there are many institutions involved with these children: Social Services, schools, foster residences foster ... among others. Educational professionals have an important role in this intervention process, being their good professional work the one that favors a tight development of children in the educational field, but this intervention takes place generally from the ignorance of the specific situation faced by children living inresidential care and from the failure of the educational administration into sharing protocols, time and space, necessary for a proper coordination. In the event children incustody, and because of the uniqueness of their situation and the importance of a good intervention, there should be no space for improvisation.In addition intervention with children in residential care has to be based on a training and intervention from the complementary roles that is to be structured, systematic and evaluated in a continuously way by the professionals involved.We understand that the principle of equality in education requires to offer these minors an opportunity based on an appropriate intervention with formed professionals, knowledgeable and with the time and the necessary conditions...