Detectable primordial non-gaussianities and gravitational waves in k-inflation

An inflationary single field model with a non-trivial kinetic term for the inflaton is discussed. It is shown that it is possible to have large primordial non-gaussianities and large tensor-to-scalar ratio in a simple concrete model with just a scalar field and a generalized kinetic term for the inflaton field. This is potentially interesting in the prospect of new forthcoming observations.Comment: 4 pages, 1 figure, REVTEX, to appear in PR

The Benefits of Schooling: A Human Capital Alocation into a Continuous Optimal Control Framework

Non

Long-Term Complications of Tracheal Intubation

Endotracheal intubation is an intervention frequently performed in the hospital setting in order to protect the central airway and provide mechanical support of ventilation. Many health care providers are expected to be able to intubate the patients for different indications. As the case in any medical intervention, endotracheal intubation can cause complications. These complications are categorized as early or late according to the time of onset of the presenting symptoms. This chapter will discuss the long term complications of endotracheal intubation that might be encountered by the treating physicians. The chapter will stress on the predisposing factors for these complications and the available methods to avoid and treat them

Tidal Love numbers of Proca stars

Proca stars (arXiv:1508.05395) are everywhere regular, asymptotically flat self-gravitating solitons composed of complex, massive vector bosons, forming a macroscopic, star-sized, Bose-Einstein condensate. They have been suggested as a classical, dynamical model of exotic compact objects, black hole mimickers and dark matter candidates. In spherical symmetry, they are qualitatively similar to their scalar cousins, the standard (scalar) boson stars in all respects studied so far. Here we study the tidal deformability and the quadrupolar tidal Love numbers, both electric-type and magnetic-type, of spherically symmetric Proca stars. The equations for the perturbations are derived and the numerical values of the Love numbers for some concrete background solutions are computed. We observe that both Love numbers are qualitatively similar to the ones of the scalar boson stars; in particular, the electric-type (magnetic-type) quadrupolar Love numbers are positive (negative) for Proca stars. Quantitatively, for the same compactness, the electric and magnetic Love numbers in the Proca case are closer (in magnitude) than in the scalar case, with the electric Love numbers having a slightly larger magnitude than the magnetic ones.Comment: 17 pages, 4 figure

Radial Oscillations in Neutron Stars with Delta Baryons

We investigate the effect of $\Delta$ baryons on the radial oscillations of neutron and hyperon stars, employing a density-dependent relativistic mean-field model. The spin-$3/2$ baryons are described by the Rarita-Schwinger Lagrangian density. The baryon-meson coupling constants for the spin-3/2 decuplet and the spin-1/2 baryonic octet are calculated using a unified approach relying on the fact that the Yukawa couplings present in the Lagrangian density of the mean-field models must be invariant under the SU(3) and SU(6) group transformations. We calculate the 20 lowest eigenfrequencies and corresponding oscillation functions of $\Delta$-inclusive nuclear (N+$\Delta$) and hyperonic matter (N+H+$\Delta$) by solving the Sturm-Liouville boundary value problem and also verifying its validity. We see that the lowest mode frequencies for N+$\Delta$ and N+H EoSs are higher as compared to the pure nucleonic matter because of the deltas and hyperons present. Furthermore, the separation between consecutive modes increases with the addition of hyperons and $\Delta$s.Comment: figures and text update

Quasinormal modes for a non-minimally coupled scalar field in a five-dimensional Einstein-power-Maxwell background

We study the propagation of massless scalar fields non-minimally coupled to gravity in the background of five-dimensional Einstein-power-Maxwell black holes, and using the WKB and the pseudospectral Chebyshev methods we obtain the quasinormal frequencies (QNFs), which allow us to show the existence of stable and unstable QNFs depending on the power $k$ of the nonlinear electrodynamics, the $\xi$ parameter, which controls the strength of the non-minimal coupling, and on the size of the black hole.Comment: Accepted for publication in EPJ Plu