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Searching for unparticles with the cosmic microwave background

Multi-field models of inflation typically assume that interactions between particles are weak and can be treated perturbatively. Strongly-coupled models provide an intriguing alternative and may offer novel inflationary phenomenology. In this work, we study the ``unparticle'' scenario, where the inflaton is weakly mixed with a strongly-coupled sector, specified by a (gapless) conformal field theory. For certain choices of the conformal scaling dimension, $\Delta$, the exchange of unparticles ...

[Recensione a] A.L. Boozer, At Home in Roman Egypt: a social archaeology, CUP 2021

On Convergence of a family of Random Walks in the Infinite Dimensional Stiefel Manifold

In this paper, we study random walks taking values in an infinite-dimensional space — either a Hilbert space, or an infinite-dimensional manifold embedded in it, such as the Stiefel manifold. These random walks arise in problems in Shape Theory, particularly when stochastic optimization is applied. In these contexts, the random walks are defined at discrete times $t \in \tau = \{ t_0 = 0 < t_1 < t_2 < \cdots \}$. By suitably interpolating the paths between...

“Kataptation” or the QWERTY-effect in language evolution

Is working enough to escape poverty? Evidence on low-paid workers in Italy

We investigate the dynamics of incidence, intensity and persistence of low pay in Italy from 1990 to 2018 by exploiting a large administrative sample of employees in the private sector. We refer to relative and absolute low pay thresholds and assess workers’ conditions according to annual earnings, weekly wages and full-time-equivalent (FTE) weekly wages, to depurate low pay dynamics from the influence of changes in worked weeks and hours. Regardless of the chosen threshold, we find that the ...

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