Excitations collectives dans la croûte interne des étoiles à neutrons

Luc Di Gallo 1
1 COSGRA
LUTH (UMR_8102) - Laboratoire Univers et Théories
Abstract : We study the spectrum of collective excitations in the inhomogeneous phases in the neutron star inner crust. In that part of the star, the structured matter takes an original shape called " pasta phase " and we expect it to be in a superfluid state. Our aim is to describe the whole range of wavelengths from the long-wavelength limit to wavelengths in the range of dimensions of the Wigner-Seitz cells. The former can be described by macroscopic approaches and is crucial for the low-energy part of the spectrum, while the latter is associated to modes usually described in microscopic calculations. We developed our model using a superfluid hydrodynamical theory allowing several components. This approach takes into account the main properties of nuclear matter through sound velocities for example. Our model consist in studying the propagation of perturbation of the hydrostatic equilibrium through structures with the shape of slabs. The effect of interfaces has been represented by defining boundary conditions and we used the Floquet-Bloch theorem in order to represent the periodicity of the structures. The resolution of equations gave us very interesting excitation spectrum. And as an application, we have discussed the contribution of these collective modes to the specific heat of the " lasagna " phase in comparison with other known contributions. More details on http://lucdigallo.free.fr/?lang=en
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Submitted on : Tuesday, February 7, 2012 - 9:44:23 PM
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Luc Di Gallo. Excitations collectives dans la croûte interne des étoiles à neutrons. Phénomènes cosmiques de haute energie [astro-ph.HE]. Université Paris-Diderot - Paris VII, 2011. Français. ⟨NNT : 2011PA077220⟩. ⟨tel-00667553⟩

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