95 research outputs found
Fundamental partial compositeness
We construct renormalizable Standard Model extensions, valid up to the Planck
scale, that give a composite Higgs from a new fundamental strong force acting
on fermions and scalars. Yukawa interactions of these particles with Standard
Model fermions realize the partial compositeness scenario. Under certain
assumptions on the dynamics of the scalars, successful models exist because
gauge quantum numbers of Standard Model fermions admit a minimal enough 'square
root'. Furthermore, right-handed SM fermions have an SU(2)-like structure,
yielding a custodially-protected composite Higgs. Baryon and lepton numbers
arise accidentally. Standard Model fermions acquire mass at tree level, while
the Higgs potential and flavor violations are generated by quantum corrections.
We further discuss accidental symmetries and other dynamical features stemming
from the new strongly interacting scalars. If the same phenomenology can be
obtained from models without our elementary scalars, they would reappear as
composite states.Comment: 36 pages, 3 figures, 5 tables. v2: final published version, expanded
discussion about neutrino masses, dark matter and flavou
Di-photon resonance and Dark Matter as heavy pions
We analyse confining gauge theories where the 750 GeV di-photon resonance is
a composite techni-pion that undergoes anomalous decays into SM vectors. These
scenarios naturally contain accidentally stable techni-pions Dark Matter
candidates. The di-photon resonance can acquire a larger width by decaying into
Dark Matter through the CP-violating -term of the new gauge theory
reproducing the cosmological Dark Matter density as thermal relic.Comment: 30 pages, 3 figures, 4 tables. v3: final version, updated including
Moriond dat
Di-photon resonance and Dark Matter as heavy pions
We analyse confining gauge theories where the 750 GeV di-photon resonance is
a composite techni-pion that undergoes anomalous decays into SM vectors. These
scenarios naturally contain accidentally stable techni-pions Dark Matter
candidates. The di-photon resonance can acquire a larger width by decaying into
Dark Matter through the CP-violating -term of the new gauge theory
reproducing the cosmological Dark Matter density as thermal relic
Data-driven design of safe control for polynomial systems
We consider the problem of designing an invariant set using only a finite set
of input-state data collected from an unknown polynomial system in continuous
time. We consider noisy data, i.e., corrupted by an unknown-but-bounded
disturbance. We derive a data-dependent sum-of-squares program that enforces
invariance of a set and also optimizes the size of the invariant set while
keeping it within a set of user-defined safety constraints; the solution of
this program directly provides a polynomial invariant set and a state-feedback
controller. We numerically test the design on a system of two platooning cars
Science and Religion: Enemies for life?
The article published by Prof. Antonio Neviani in 1896 offered us an interesting opportunity to discuss about the teaching of human evolution in schools today. Already at the end of the nineteenth century, Neviani complained about the fact that the teaching of the theory of evolution was not present in schools. Here, we present the thought of Neviani and we invite to reflect on the prohibition, still present in some countries, of the teaching of Darwin's theory. (www.actabiomedica.it)
Laser scanning and modelling of barely visible features: the survey of the Grotto of the Animals at the Villa of Castello (Florence)
The deep fusion of natural and artificial elements typical of Italian Renaissance gardens is particularly evident in the park of Villa di Castello and in the Grotto of the Animals, also called Grotto of the Flood.
The soil slope is the essential element of a huge underlying hydraulic machine and it is the result of extensive earthworks which led to the construction of the big retaining wall limiting the grotto and the adjacent fountains. Hence, this grotto represents only the visible part of a mechanism running all around it. It is formed by a single chamber vaulted and covered with sponge-like stones, as well as decorations made of pebbles and shells. The space is divided into three wings, with big marble basins at their end. Over them there are reliefs of animals made of different stones and marbles. Animals recur also in the compositions of fish and shellfish decorating the side basins and in the bronze birds currently kept in the Museo del Bargello.
The name “Grotto of the Flood” comes from the water feature that characterised this place: visitors were surprised by tens of jets hidden among the stones in the vault and in the floor. To obtain this effect, the whole grotto is surrounded by multi-storey tunnels, hiding the hydraulic system and people activating the mechanisms. Research agreements were drawn up between the Special Superintendence for the Historical, Artistic and Ethnoanthropological Heritage, the Florence museums group and the GeCO Lab, for the realization of the survey presented in this paper. The task of the GeCO Lab was thus identifying the best solutions to check the spatial relations between the grotto and the area above, as well as the geometric and functional connections between the building and the ancient hydraulic system, composed by pipes and nozzles concealed between the stones. Besides, the overall survey was intended as a documentation of the on-going restoration work
- …