Cold and Hot Atomic Vapors: A Testbed for Astrophysics?

Baudouin, Quentin; Guerin, William; Kaiser, Robin

doi:10.1142/9789814590174_0005

Cited by 8 publications

(12 citation statements)

References 175 publications

(187 reference statements)

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“…(8)(9)(10) reflect the effect of the last jump interval in the process on the final position of the particle. This last incomplete time interval is called backward recurrence time τ b = t − t n , where t n is the epoch of the last renewal (see Fig.…”

Section: Propagatorsmentioning

confidence: 99%

Asymptotic densities of ballistic Lévy walks

et al. 2015

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We propose an analytical method to determine the shape of density profiles in the asymptotic long time limit for a broad class of coupled continuous time random walks which operate in the ballistic regime. In particular, we show that different scenarios of performing a random walk step, via making an instantaneous jump penalized by a proper waiting time or via moving with a constant speed, dramatically effect the corresponding propagators, despite the fact that the end points of the steps are identical. Furthermore, if the speed during each step of the random walk is itself a random variable, its distribution gets clearly reflected in the asymptotic density of random walkers. These features are in contrast with more standard non-ballistic random walks.

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Section: Propagatorsmentioning

confidence: 99%

Asymptotic densities of ballistic Lévy walks

et al. 2015

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“…These effects (see Ref. [8] for a review) can be well explained by a diffusive description of light transport, or with an incoherent, random-walk model for photons. In this 'diffuse scattering' approach, no information on the phase of the scattered light is required to obtain a satisfactory description of the observed experimental results.…”

Section: Introductionmentioning

confidence: 99%

Collective effects in the radiation pressure force

et al. 2016

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We discuss the role of diffuse, Mie and cooperative scattering on the radiation pressure force acting on the center of mass of a cloud of cold atoms. Even though a mean-field Ansatz (the 'timed Dicke state'), previously derived from a cooperative scattering approach, has been shown to agree satisfactorily with experiments, diffuse scattering also describes very well most features of the radiation pressure force on large atomic clouds. We compare in detail an incoherent, random walk model for photons and a diffraction approach to the more complete description based on coherently coupled dipoles. We show that a cooperative scattering approach, although it provides a quite complete description of the scattering process, is not necessary to explain the previous experiments on the radiation pressure force.

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“…A bridge with Bose-Einstein condensates can also be established [16,17]. These similarities open the way for studies of laboratory analogues of gravity [18][19][20].…”

Section: Introductionmentioning

confidence: 88%

Schrödinger–Newton Model with a Background

Mendonça

2021

Symmetry

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This paper considers the Schrödinger–Newton (SN) equation with a Yukawa potential, introducing the effect of locality. We also include the interaction of the self-gravitating quantum matter with a radiation background, describing the effects due to the environment. Matter and radiation are coupled by photon scattering processes and radiation pressure. We apply this extended SN model to the study of Jeans instability and gravitational collapse. We show that the instability thresholds and growth rates are modified by the presence of an environment. The Yukawa scale length is more relevant for large-scale density perturbations, while the quantum effects become more relevant at small scales. Furthermore, coupling with the radiation environment modifies the character of the instability and leads to the appearance of two distinct instability regimes: one, where both matter and radiation collapse together, and others where regions of larger radiation intensity coincide with regions of lower matter density. This could explain the formation of radiation bubbles and voids of matter. The present work extends the SN model in new directions and could be relevant to astrophysical and cosmological phenomena, as well as to laboratory experiments simulating quantum gravity.

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Cold and Hot Atomic Vapors: A Testbed for Astrophysics?

Cited by 8 publications

References 175 publications

Asymptotic densities of ballistic Lévy walks

Asymptotic densities of ballistic Lévy walks

Collective effects in the radiation pressure force

Schrödinger–Newton Model with a Background

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