Alessandro Vichi

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In an arbitrary unitary 4D CFT we consider a scalar operator φ, and the operator φ2 defined as the lowest dimension scalar which appears in the OPE φ × φ with a nonzero coefficient. Using general considerations of OPE, conformal block decomposition, and crossing symmetry, we derive a theory-independent inequality [φ2] ≤ f([φ]) for the dimensions of these(More)
Sheer El-Showk, Miguel F. Paulos, David Poland, Slava Rychkov, David Simmons-Duffin, and Alessandro Vichi Institut de Physique Théorique CEA Saclay, CNRS-URA 2306, 91191 Gif sur Yvette, France Laboratoire de Physique Théorique et Hautes Energies, CNRS UMR 7589, Université Pierre et Marie Curie, 4 place Jussieu, 75252 Paris Cedex 05, France School of Natural(More)
Guanine nucleotide-exchange factors (GEFs) activate ADP-ribosylation factor (ARF) GTPases that recruit coat proteins to membranes to initiate transport vesicle formation. Three mammalian GEFs are inhibited by brefeldin A (BFA). GBF1, predominantly associated with cis-Golgi membranes, functions early in the secretory pathway, whereas BIG1 and BIG2 act in(More)
The aim of this study is to assess by means of shear bond strength tests (SBS), microleakage analysis (μLKG), and scanning electron microscopy (SEM) the bonding potential and sealing ability of a new self-adhering composite resin. SBS and μLKG of Vertise Flow (VF, Kerr) were measured and compared to the all-in-one adhesive systems G-Bond (GB, GC), AdheSE(More)
This in vivo study examined the contribution of remaining coronal dentin and placement of a prefabricated (LP) or customized fiber post (ES) to the six-year survival of endodontically treated premolars. A sample of 345 patients provided 6 groups of 60 premolars each in need of endodontic treatment. Groups were classified according to the number of remaining(More)
OBJECTIVES The aim of the study was to evaluate the influence of layer thickness on the final color for different shade and opacity composite combinations in a laboratory set-up simulating a 2-layer stratification technique. METHODS Resin disks of different thicknesses were made. From one composite system (Point4, Kerr Co.), four dentin shades were(More)
OBJECTIVES To assess depth of cure (DOC), degree of conversion (DC), and flexural strength (FS) of several resin composites with low-stress behavior. METHODS SonicFill (Kerr), SureFil(®) SDR™ (Dentsply), everX Posterior (GC), Kalore (GC), and Filtek Silorane (3M ESPE) were tested. DOC was measured with the Acetone Shake test. DC was assessed with Fourier(More)
We use the conformal bootstrap to perform a precision study of the operator spectrum of the critical 3d Ising model. We conjecture that the 3d Ising spectrum minimizes the central charge c in the space of unitary solutions to crossing symmetry. Because extremal solutions to crossing symmetry are uniquely determined, we are able to precisely reconstruct the(More)
We study the conformal bootstrap in fractional space-time dimensions, obtaining rigorous bounds on operator dimensions. Our results show strong evidence that there is a family of unitary conformal field theories connecting the 2D Ising model, the 3D Ising model, and the free scalar theory in 4D. We give numerical predictions for the leading operator(More)