We reanalyse the limits on the gravitino mass m 3/2 in superlight gravitino scenarios derived from arguments on energy-loss during gravitational collapse. We conclude that the mass range 10 −7 eV ≤ m 3/2 ≤ 2.2 × 10 −6 eV is excluded by SN1987A data. In terms of the scale of supersymmetry breaking Λ, the range 70GeV ≤ Λ ≤ 300GeV is not allowed.

The note below “How U.S. Economic Statistics Comply With the New  Standards” and the following article “Standards for the Dissemination of Economic and Financial Statistics” discuss the International Monetary Fund’s new standards for data dissemination. Already,  countries—including Canada, France, Italy, Japan, the United Kingdom, and the United States—have subscribed to the “Special Data...

In this note we investigate the ability of a mean-field model distilled from the heterogeneous agents model of [7] to simulate stylized facts of financial times series.

Hertfordshire Business School employs approximately 200 academic staff in a state-of-the-art environment located in Hatfield Business Park. It offers 17 undergraduate degree programmes and 21 postgraduate programmes; there are about 75 research students working at doctoral level. The University of Hertfordshire is the UK’s leading business-facing university and an exemplar in the sector. It is ...

In this paper, we present new results on the reconstruction of signals from one bit of Fourier transform phase, defined as th.e sign of the real part of the Fourier transform. Specifically, we develop a new theoretical result which shows that most twodimensioral signals can in fact be reconstructed to within a scale factor from only one bit of FT phase. Experimental results showing images recon...

Amniotic fluid was analysed for foetal testosterone (FT) level. Postnatally, the infants (29 girls and 41 boys) and parents were filmed at 12 months of age, and the amount of eye contact made by the infant to the parent was recorded. Girls made significantly more eye contact than boys. This replicates previous studies showing a female superiority in sociality more broadly, and eye contact in pa...

In the Portuguese school system, form tutors (FTs) are an intermediate education management structure. The form tutor is responsible for a position of coordination and orientation with a «threefold function»: a relationship with students, relationship with the student’s family and relationship with other class teachers. The joint teaching of music is a part of the educational system in basic ed...

We consider a reduced form model for a large pool of possibly defaultable entities. We allow the times of defaults to be correlated not only by their dependence on a common factor, but also by their dependence on the extent of past defaults, therefore with a self-exciting nature. We characterize the limiting process for the mean number of defaults and the mean loss, as the number of entities be...

We consider a regulator who does not know how many firms should be granted a license to enter a market as he has limited information on their setup costs. We propose two auction formats which implement the efficient market structure. One is called ”jumping English auction”, where the price for a license increases continuously most of the times, but jumps at pre-specified points. The other is ca...

Mean elevation of all continents, as well as mean elevation of individual continents, should be at the fundamental level controlled by the global tectonic and climatic systems. I propose a first-order model considering the interplay of the two factors in controlling mean elevation of continents. The model is able to account for the positive correlation between the present-day mean elevation and...