How Will I Tell You?

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Moduli Stabilisation and the Holographic Swampland

We investigate whether Swampland constraints on the low-energy dynamics of weakly coupled, moduli-stabilised string vacua in AdS can be related to inconsistencies of their putative holographic duals or, more generally, recast in terms of CFT data. We find that various swampland consistency constraints are equivalent to a negativity condition on the sign of certain mixed anomalous dimensions. This condition is similar to well-established CFT positivity bounds arising from causality and unitarity, but not known to hold in general. The studied scenarios include LVS, KKLT, and both perturbative and racetrack stabilisation. Interestingly, the LVS vacuum (with $\Delta_{\varphi} = 8.038$) also appears to live very close to a critical value ($\Delta_{\varphi} = 8$) where the anomalous dimensions change sign. We finally point out an intriguing connection to the Swampland Distance Conjecture, both in its original and refined versions.Comment: 37 pages + references, 4 figures; v2 added references and corrected typo

Catch-Me-If-You-Can: The Overshoot Problem and the Weak/Inflation Hierarchy

We study the overshoot problem in the context of post-inflationary string cosmology (in particular LVS). LVS cosmology features a long kination epoch as the volume modulus rolls down the exponential slope towards the final minimum, with an energy density that scales as $m_s^4$. This roll admits attractor tracker solutions, and if these are located the overshoot problem is solved. We show that, provided a sufficiently large hierarchy exists between the inflationary scale and the weak scale, this will always occur in LVS as initial seed radiation grows into the tracker solution. The consistency requirement of ending in a stable vacuum containing the weak hierarchy therefore gives a preference for high inflationary scales -- an anthropic argument, if one likes, for a large inflation/weak hierarchy. We discuss various origins, both universal and model-dependent, of the initial seed radiation (or matter). One particularly interesting case is that of a fundamental string network arising from brane inflation -- this may lead to an early epoch in which the universe energy density principally consists of gravitational waves, while an LVS fundamental string network survives into the present universe.Comment: Corrected typos, reference added. Included a comment on the scaling of the total energy density during kinatio

Composite Dark Matter from Strongly-Interacting Chiral Dynamics

A class of chiral gauge theories is studied with accidentally-stable pseudo Nambu-Goldstone bosons playing the role of dark matter (DM). The gauge group contains a vector-like dark color factor that confines at energies larger than the electroweak scale, and a ${\rm U}(1)_D$ factor that remains weakly coupled and is spontaneously broken. All new scales are generated dynamically, including the DM mass, and the IR dynamics is fully calculable. We analyze minimal models of this kind with dark fermions transforming as non-trivial vector-like representations of the Standard Model (SM) gauge group. In realistic models, the DM candidate is a SM singlet and comes along with charged partners that can be discovered at high-energy colliders. The phenomenology of the lowest-lying new states is thus characterized by correlated predictions for astrophysical observations and laboratory experiments.Comment: 56 pages (43 + appendices), 13 figures. v2: minor changes, matching to the published version. One reference added and typos fixe

Actividades colaborativas en el aprendizaje de marcadores discursivos en estudiantes universitarios

The objective of this research work is to analyze the influence of collaborative activities on the learning of discourse markers in the students of the Language Comprehension and Production from a private university in Lima. It is an applied research with a quasi-experimental design, composed of experimental and control. For the collection of data, the Test on discourse markers was used. Likewise, a pretest measurement was carried out successively, and once the results were obtained, the workshop on collaborative activities, composed of 7 sessions, was conducted in the experimental group to then carry out the posttest measurements in both groups. The hypothesis testing was made with the Mann Whitney U test. The results showed that there was significant influence of the collaborative work on the learning of the discourse markers in the students that are object of study.El objetivo de la presente investigación es analizar la influencia de las actividades colaborativas en el aprendizaje de los marcadores discursivos en los estudiantes del curso Comprensión y Producción de Lenguaje de una universidad privada de Lima. Es una investigación aplicada con un diseño cuasi experimental, conformándose los grupos, experimental y control. Para la recolección de datos, se empleó la Prueba sobre marcadores discursivos. Asimismo, se efectuó sucesivamente una medición pre test, y obtenidos los resultados,  se aplicó el taller sobre actividades colaborativas, compuesto por 7 sesiones, en el grupo experimental, para luego efectuar las mediciones post test, en ambos grupos. La contrastación de hipótesis se efectuó con la prueba U de Mann Whitney. Los resultados mostraron que hubo influencia significativa del trabajo colaborativo sobre el aprendizaje de los marcadores discursivos en los estudiantes objeto de estudio

Art, Creativity and Automation. From Charters to Shared 3D Visualization Practices

In this study, we introduce the themes of the Special Issue on Art, Creativity and Automation. Sharing 3D Visualization Practices in Archaeology, and present the most important outcomes of a roundtable session involving prominent researchers in the field, organized by the authors during the Archon Winter School in February 2020. By assessing the diversity of research aims, artistic projects, creative practices and technology used in the contributions to the Special Issue, and drawing on the thoughts and perspectives generated during the roundtable discussion, we seek to identify shared challenges within the community of visualizers which could ultimately pave the way to shared practices. In this light, we assess whether established charters and guidelines are still relevant in a now matured digital archaeology, where visualization techniques have attained a central position in archaeological knowledge production. Although parts of the guidelines have become common practice, the remainder did not keep up with the fast pace of development of digital practice and its current fundamental role in archaeology, and as a result some of the guidelines risk becoming obstructive in archaeological creative practice.Material Culture Studie

Influencia del índice de escasez en la evaluación de tasas por uso y retributiva caso de estudio: cuenca río Guatiquía

El presente proyecto busca entregar a la Corporación Autónoma Regional Cormacarena la información correspondiente al inventario de las empresas prestadoras de los servicios de acueducto y alcantarillado, existentes a Diciembre de 2009 en la cuenca del río Guatiquia , su localización geográfica, el estimativo de recaudo de las tasas por uso y retributivas, y finalmente el análisis de la influencia del índice de escasez en la evaluación de estas tasas dentro de la cuenca. Para la elaboración del proyecto, se comenzó recopilando toda la información secundaria de las alcaldías, gobernaciones, Cormacarena, el Ministerio de Ambiente, Vivienda y Desarrollo Territorial, la Superintendencia de Servicios Públicos Domiciliarios y las mismas empresas prestadoras en la zona, a partir de esto se realizo un análisis de las empresas registradas en la corporación autónoma que actualmente realizan pagos por tasas de uso y retributivas, y finalmente se determino la influencia del índice de escasez en el pago de estas tasas. Este proyecto contribuirá a Cormacarena en la formulación del Plan de ordenación y manejo de la cuenca hidrográfica del río Guatiqui

A Hundred Anniversary of the Seminary “Saint Joseph” of La Plata. The challenge of forming priests for the new evangelization

Una contundente reflexión sobre el Seminario, en su centenario de fundación. El padre, ex docente de la casa, nos pasea por el origen entusiasta en la formación de los primeros sacerdotes, hasta la importancia que tuvo el Concilio Vaticano II en la asunción de un nuevo seminario que apunte al sacerdocio que el Pueblo de Dios necesita. Por último, precisa los elementos que el seminarista necesitará para cultivar su formación en estos tiempos desafiantes: La necesidad de cercanía con Dios, el obispo, la comunidad sacerdotal y el Pueblo. Es fundamental la creatividad, la personalización, el autoconocimiento y el amor a la Iglesia en intimidad con Dios. Y "Por sobre todas las cosas un gran amor por las personas, porque el amor es el lenguaje que todo ser humano conoce perfectamente".A forceful reflection on the Seminary, in its centenary of foundation. The father, a former teacher of the house, takes us through the enthusiastic origin in the formation of the first priests, up to the importance that the Second Vatican Council had in the assumption of a new seminary that aims at the priesthood that the People of God needs. Finally, he specifies the elements that the seminarian will need to cultivate his formation in these challenging times: The need for closeness with God, the bishop, the priestly community and the People. Creativity, personalization, self-knowledge and love for the Church in intimacy with God are fundamental. And "Above all, a great love for people, because love is the language that every human being knows perfectly well".Cátedra Libre de Pensamiento Cristiano (UNLP)Seminario Mayor San José (La Plata