An Early Christian Marble Relief at Kavala

Μη διαθέσιμη περίληψηno abstrac

The Beauty of Castles: A Tenth Century Description of a Tower at Constantinople

Μη διαθέσιμη περίληψηno abstrac

Phase transitions in 3D gravity and fractal dimension

We show that for three dimensional gravity with higher genus boundary conditions, if the theory possesses a sufficiently light scalar, there is a second order phase transition where the scalar field condenses. This three dimensional version of the holographic superconducting phase transition occurs even though the pure gravity solutions are locally AdS$_3$. This is in addition to the first order Hawking-Page-like phase transitions between different locally AdS$_3$ handlebodies. This implies that the R\'enyi entropies of holographic CFTs will undergo phase transitions as the R\'enyi parameter is varied, as long as the theory possesses a scalar operator which is lighter than a certain critical dimension. We show that this critical dimension has an elegant mathematical interpretation as the Hausdorff dimension of the limit set of a quotient group of AdS$_3$, and use this to compute it, analytically near the boundary of moduli space and numerically in the interior of moduli space. We compare this to a CFT computation generalizing recent work of Belin, Keller and Zadeh, bounding the critical dimension using higher genus conformal blocks, and find a surprisingly good match

Application Of Geophysical And Geochronological Methods To Sedimentologic And Stratigraphic Problems In The Lower Cambrian Monkton Formation: Northwestern Vermont

The Monkton Formation of the western shelf stratigraphic sequence in Vermont (VT) is identified as a Lower Cambrian regressive sandstone unit containing parasequences recording tidal flat progradation. Previous workers identified cycles believed to represent parasequences in a portion of a 1034\u27 deep geothermal well drilled at Champlain College in Burlington, Vermont. For this study, both outcrop and well geophysical surveys were completed to better identify gamma emission curves and relative values for parasequences and select lithologies that are indicators of bathymetry and sea level. After using physical stratigraphic techniques to assemble a composite stratigraphic section for the Monkton Formation, analysis of the gamma emission curve and relative gamma values resulted in the identification and characterization of parasequences and select lithologies within the Monkton. Interpretation of bathymetry-sensitive lithologies along with parasequence architecture and thickness trends reveals three distinctive intervals over the thickness of the Monkton. It is recognized that the succession of these intervals represents an overall decreasing rate in accommodation space generation through Monkton deposition. Previous workers have suggested that biostratigraphic relationships of the Monkton Formation to the Potsdam Group in New York (NY) suggest that that they would be at least partially correlative. To further refine age relationships and constrain and compare the provenance of the Vermont stratigraphy locally and regionally, zircon samples were collected from the Monkton and the overlying Danby Formations and radiometric age determinations were completed by laser ablation–inductively coupled plasma mass spectrometry (LA-ICPMS) at University of Arizona Laserchron Center. Zircon age probability distribution curves show two dominate age peaks between 1.05-1.09 Ga and 1.15-1.18 Ga for the Monkton and Danby suggesting either a continuity of provenance through the Cambrian or the cycling of the Monkton\u27s sand. The 1.05-1.09 Ga age range corresponds to rocks generated during the Ottawan Orogeny while the 1.15-1.18 Ga range is associated with the Shawinigan Orogeny and anorthosite-mangerite-charnockite-granite (AMCG) plutonism. Dominant age peaks in the Vermont samples between 1.15-1.18 Ga are similar to the 1.16 Ga age peak reported by other workers from the Altona and Ausable Formations of the Potsdam Group of New York. The shared dominant age peak and close proximity of the Vermont and New York stratigraphy may suggest a primarily shared provenance

Zidni mozaici u Eufrazijevoj katedrali u Poreču: prethodno izvješće

This article provides the findings of a study of the 6th century wall mosaics at the Eufrasiana. It was based on a visual analysis of the lower mosaics (to the inscription) done from scaffolding during June of 1997. After a review of the conservation history and pre-restoration records, the authors characterize three phases of mosaics: the original work, a limited restoration from 1886 (Solerti), and an extensive restoration from 1890-1900 (Bornia). Analyses are offered of both the original and restored tesserae, setting beds and setting techniques. Bornia took great pains to preserve as much as possible of the original mosaics

Zidni mozaici u Eufrazijevoj katedrali u Poreču: prethodno izvješće

This article provides the findings of a study of the 6th century wall mosaics at the Eufrasiana. It was based on a visual analysis of the lower mosaics (to the inscription) done from scaffolding during June of 1997. After a review of the conservation history and pre-restoration records, the authors characterize three phases of mosaics: the original work, a limited restoration from 1886 (Solerti), and an extensive restoration from 1890-1900 (Bornia). Analyses are offered of both the original and restored tesserae, setting beds and setting techniques. Bornia took great pains to preserve as much as possible of the original mosaics