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Bose-Einstein Condensate and Gravitational Shielding

Fran De Aquino

Published Jan 14, 2014• 0 citations
OpenAlex

Abstract

In this work we show that when possible transform some types of substance into a Bose-Einstein condensate at room temperature, which exists long enough to be used in practice then will be possible to use these substances in order to create efficient Gravitational Shieldings.

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Partly motivated by recent proposals for the detection of gravitational waves, we study their interaction with Bose-Einstein condensates. For homogeneous condensates at rest, the gravitational wave does not directly create phonons (to lowest order) but merely affects existing phonons or indirectly creates phonon pairs via quantum squeezing---an effect which has already been considered in the literature. For inhomogeneous condensate flows such as a vortex lattice, however, the impact of the gravitational wave can directly create phonons. This more direct interaction can be more efficient and could perhaps help bring such a detection mechanism for gravitational waves a step closer towards experimental realizability---even though there is still a long way to go. Finally, we argue that super-fluid helium might offer some advantages in this respect.
The goal of the MAIUS-1 sounding rocket mission is the realization of the first Bose-Einstein-Condensate and following atom interferometry measurements in space. The hardware of this experiment is specifically designed to match the requirements of a sounding rocket mission. Since the different techniques to create a Bose-Einstein-Condensate like magneto-optical traps and the following atom interferometry methods are very sensitive to external magnetic fields, a effective magnetic shielding is necessary. In this work the design and also the magnetic properties and flight-readiness test procedures are described in great detail. The three-layer magnetic shielding provides a high shielding effectiveness factor of S 1000 for an undisturbed operation of the experiment. With this magnetic shielding it was possible to create the first Bose-Einstein-Condensate in space during the flight of the MAIUS-1 sounding rocket.
We consider interacting Bose particles in an external potential. It is shown that a Bose-Einstein condensate is possible at finite temperatures that describes a super solid in three dimensions (3D) for a wide range of potentials in the absence of an external potential. However, for 2D, a self-organized super solid exists for finite temperatures provided the interaction between bosons is nonlocal and of infinitely long-range. It is interesting that in the absence of the latter type of potential and in the presence of a lattice potential, there is no Bose-Einstein condensate and so in such a case, a 2D super solid is not possible at finite temperatures. We also propose the correct Bloch form of the condensate wave function valid for finite temperatures, which may be used as the correct trial wave function.