Three Dimensional de Sitter Gravity and the Correspondence

Certain aspects of three dimensional asymptotically de Sitter spaces are studied, with emphasis on the mapping between gravity observables and the representation of the conformal symmetry of the boundary. In particular, we show that non-real conformal weights for the boundary theory correspond to space-times that have non-zero angular momentum. Some miscellaneous results on the role of the holonomies and isometry groups are also presented.Comment: 10 pages, 1 figure, uses epsf. Added references and a discussion on the (dis)similarities with previous work

Inflation and Holography in String Theory

The encoding of an inflating patch of space-time in terms of a dual theory is discussed. Following Bousso's interpretation of the holographic principle, we find that those are generically described not by states in the dual theory but by density matrices. We try to implement this idea on simple deformations of the AdS/CFT examples, and an argument is given as to why inflation is so elusive to string theory.Comment: 15 pages, LaTeX, 2 figures. Uses psbox.te

Tachyon Effective Dynamics and de Sitter Vacua

We show that the DBI action for the singlet sector of the tachyon in two-dimensional string theory has a SL(2,R) symmetry, a real-time counterpart of the ground ring. The action can be rewritten as that of point particles moving in a de Sitter space, whose coordinates are given by the value of the eigenvalue and time. The symmetry then manifests as the isometry group of de Sitter space in two dimensions. We use this fact to write the collective field theory for a large number of branes, which has a natural interpretation as a fermion field in this de Sitter space. After spending some time building geometrical insight on facts about the condensation process, the state corresponding to a sD-brane is identified and standard results in quantum field theory in curved space-time are used to compute the backreaction of the thermal background.Comment: 28 pages, 1 eps figure. Uses graphicx, setspace. v2:corrected typos, added references, clarified discussion on backreactio

Deep Learning Criminal Networks

Recent advances in deep learning methods have enabled researchers to develop and apply algorithms for the analysis and modeling of complex networks. These advances have sparked a surge of interest at the interface between network science and machine learning. Despite this, the use of machine learning methods to investigate criminal networks remains surprisingly scarce. Here, we explore the potential of graph convolutional networks to learn patterns among networked criminals and to predict various properties of criminal networks. Using empirical data from political corruption, criminal police intelligence, and criminal financial networks, we develop a series of deep learning models based on the GraphSAGE framework that are capable to recover missing criminal partnerships, distinguish among types of associations, predict the amount of money exchanged among criminal agents, and even anticipate partnerships and recidivism of criminals during the growth dynamics of corruption networks, all with impressive accuracy. Our deep learning models significantly outperform previous shallow learning approaches and produce high-quality embeddings for node and edge properties. Moreover, these models inherit all the advantages of the GraphSAGE framework, including the generalization to unseen nodes and scaling up to large graph structures.Comment: 14 two-column pages, 5 figure

Hole spin polarization in GaAlAs:Mn structures

A self-consistent calculation of the electronic properties of GaAlAs:Mn magnetic semiconductor quantum well structures is performed including the Hartree term and the sp-d exchange interaction with the Mn magnetic moments. The spin polarization density is obtained for several structure configurations. Available experimental results are compared with theory.Comment: 4 page

Kerr-CFT From Black-Hole Thermodynamics

We analyze the near-horizon limit of a general black hole with two commuting killing vector fields in the limit of zero temperature. We use black hole thermodynamics methods to relate asymptotic charges of the complete spacetime to those obtained in the near-horizon limit. We then show that some diffeomorphisms do alter asymptotic charges of the full spacetime, even though they are defined in the near horizon limit and, therefore, count black hole states. We show that these conditions are essentially the same as considered in the Kerr/CFT corresponcence. From the algebra constructed from these diffeomorphisms, one can extract its central charge and then obtain the black hole entropy by use of Cardy's formula.Comment: 19 pages, JHEP3, no figures. V2: References added, small typos fixe

Soroprevalência de Rickettsias do grupo da Febre Maculosa em cães residentes em Unidade de Conservação do Rio de Janeiro / Soroprevalence of Rickettsias from the Maculosa Fever group in dogs living in the Rio de Janeiro Conservation Unit

O monitoramento de doenças infecciosas, parasitárias e zoonóticas é fundamental para a saúde coletiva e até mesmo ecossistêmica, principalmente em Unidades de Conservação, como o Parque Estadual da Serra da Tiririca-RJ (PESET). Rickettsias do Grupo da Febre Maculosa estão associadas a artrópodes hematófagos e podem causar uma doença potencialmente letal em humanos. Nesse contexto, ações de monitoramento em prol do diagnóstico de áreas de risco são de extrema importância. O PESET está localizado nos Municípios de Niterói e Maricá e abriga rica diversidade biológica, além de remanescentes de comunidades humanas de origens diversas. A maioria dos moradores possui animais domésticos, principalmente cães, o que permite uma interação entre eles, a fauna e o homem, contribuindo para a transmissão de patógenos de importância na saúde pública. O objetivo desta pesquisa foi realizar o inquérito sorológico de Rickettsias do Grupo de Febre Maculosa utilizando a reação de imunofluorescência indireta, a fim de contribuir como ferramenta de monitoramento da Febre Maculosa e auxiliar em futuras medidas de prevenção e controle. Como resultado, encontramos em 146 cães uma prevalência de 23% de reatividade para R. rickettsii e 47% de reatividade para R. parkeri, com título máximo de 1: 512 para ambos os antígenos. O presente trabalho demonstrou que tanto R. rickettsii quanto R. parkeri circulam na área estudada, alertando para a importância dos caninos como sentinelas de ambos os antígenos e servindo como alerta para futuros casos humanos

Dwelling on de Sitter

A careful reduction of the three-dimensional gravity to the Liouville description is performed, where all gauge fixing and on-shell conditions come from the definition of asymptotic de Sitter spaces. The roles of both past and future infinities are discussed and the conditions space-time evolution imposes on both Liouville fields are explicited. Space-times which correspond to non-equivalent profiles of the Liouville field at past and future infinities are shown to exist. The qualitative implications of this for any tentative dual theory are presented.Comment: RevTeX 4, 8 pages, v3: Small clarifications on sections III and IV and references added/corrected, v4: typo

Maternal γδ T cells shape offspring pulmonary type 2 immunity in a microbiota-dependent manner.

Immune development is profoundly influenced by vertically transferred cues. However, little is known about how maternal innate-like lymphocytes regulate offspring immunity. Here, we show that mice born from γδ T cell-deficient (TCRδ-/-) dams display an increase in first-breath-induced inflammation, with a pulmonary milieu selectively enriched in type 2 cytokines and type 2-polarized immune cells, when compared with the progeny of γδ T cell-sufficient dams. Upon helminth infection, mice born from TCRδ-/- dams sustain an increased type 2 inflammatory response. This is independent of the genotype of the pups. Instead, the offspring of TCRδ-/- dams harbors a distinct intestinal microbiota, acquired during birth and fostering, and decreased levels of intestinal short-chain fatty acids (SCFAs), such as pentanoate and hexanoate. Importantly, exogenous SCFA supplementation inhibits type 2 innate lymphoid cell function and suppresses first-breath- and infection-induced inflammation. Taken together, our findings unravel a maternal γδ T cell-microbiota-SCFA axis regulating neonatal lung immunity