Supersymmetric chameleons and ultra-local models

Super-chameleon models where all types of matter belong to three secluded sectors, i.e. the dark, supersymmetry breaking and matter sectors, are shown to be dynamically equivalent to ultra-local models of modified gravity. In the dark sector, comprising both dark matter and dark energy, the interaction range between the dark energy field and dark matter is constrained to be extremely short, i.e. shorter than the inverse gravitino mass set by supersymmetry breaking. This realises an extreme version of chameleon screening of the dark energy interaction. On the other hand, the baryonic matter sector decouples from the dark energy in a Damour-Polyakov way. These two mechanisms preclude the existence of any modification of gravity locally in the Solar System due to the presence of the super-chameleon field. On larger scales, the super-chameleon can have effects on the growth of structure and the number of dark matter halos. It can also affect the dynamics of galaxies where the fifth force interaction that it induces can have the same order of magnitude as Newton's interaction.Comment: 23 pages, 14 figures. arXiv admin note: text overlap with arXiv:1605.0293

Single vs double ballot and party coalitions: the impact on fiscal policy. Evidence from Italy

We use data for all Italian municipalities, from 2001-2006, to empirically test the extent to which two electoral rules, which hold, for small and large municipalities, affect fiscal policy decisions. Municipalities with fewer than 15,000 inhabitants elect their mayors in accordance with a single ballot plurality rule while the rest of the municipalities uses a run-off plurality rule. Per capita total taxes, charges and current expenditure in large municipalities are lower than in small ones if the mayor of the large municipality does not need a broad coalition to be elected

Muon transfer from muonic hydrogen to atomic oxygen

The muon transfer probabilities between muonic hydrogen and an oxygen atom are calculated in a constrained geometry one dimensional model for collision between 10^-6 and 10^3 eV. These estimated rates are discussed in the light of previous model calculations and available experimental data for this process.Comment: Submitted to Phys. Rev.

Non-zero density-velocity consistency relations for large scale structures

We present exact kinematic consistency relations for cosmological structures that do not vanish at equal times and can thus be measured in surveys. These rely on cross-correlations between the density and velocity, or momentum, fields. Indeed, the uniform transport of small-scale structures by long wavelength modes, which cannot be detected at equal times by looking at density correlations only, gives rise to a shift in the amplitude of the velocity field that could be measured. These consistency relations only rely on the weak equivalence principle and Gaussian initial conditions. They remain valid in the non-linear regime and for biased galaxy fields. They can be used to constrain non-standard cosmological scenarios or the large-scale galaxy bias.Comment: 5 page

Design rules for combined label-free and fluorescence Bloch surface wave biosensors

We report on the fabrication and physical characterization of optical biosensors implementing simultaneous label-free and fluorescence detection and taking advantage of the excitation of Bloch surface waves at a photonic crystal’s truncation interface. Two types of purposely-designed one dimensional photonic crystals on molded organic substrates with micro-optics were fabricated. These feature either high or low finesse of the Bloch surface wave resonances and were tested on the same optical readout system. The experimental results show that designing biochips with a large resonance quality factor does not necessarily lead in the real case to an improvement of the biosensor performance. Conditions for optimal biochips’ design and operation of the complete bio-sensing platform are established

Switch towards tax centralization in italy: a wake up for the local political budget cycle

The abolition of the municipal property tax on owner-occupied dwellings accomplished in Italy in 2008 offers a quasi-natural experiment that allows for the identification of the presence of political budget cycles - the incentives for municipalities close to elections to manipulate policy outcome decisions. Our empirical analysis shows that the reform impacted on municipalities that in 2008 were in their preelectoral year, by expanding the size of their budget in the form of an increase of current expenditure and fees and charges, but this did not occurred in municipalities that experienced their pre-electoral year before 2008

Waterborne outbreak of Norwalk-like virus gastroenteritis at a tourist resort, Italy.

In July 2000, an outbreak of gastroenteritis occurred at a tourist resort in the Gulf of Taranto in southern Italy. Illness in 344 people, 69 of whom were staff members, met the case definition. Norwalk-like virus (NLV) was found in 22 of 28 stool specimens tested. The source of illness was likely contaminated drinking water, as environmental inspection identified a breakdown in the resort water system and tap water samples were contaminated with fecal bacteria. Attack rates were increased (51.4%) in staff members involved in water sports. Relative risks were significant only for exposure to beach showers and consuming drinks with ice. Although Italy has no surveillance system for nonbacterial gastroenteritis, no outbreak caused by NLV has been described previously in the country