scholarly journals Analytic theory for Bragg atom interferometry based on the adiabatic theorem

2020 ◽  
Vol 102 (3) ◽  
Author(s):  
Jan-Niclas Siemß ◽  
Florian Fitzek ◽  
Sven Abend ◽  
Ernst M. Rasel ◽  
Naceur Gaaloul ◽  
...  
Keyword(s):  
Atom Interferometry ◽  
Analytic Theory ◽  
Adiabatic Theorem

scholarly journals Persistence of the spectral gap for the Landau–Pekar equations

2021 ◽  
Vol 111 (1) ◽  
Author(s):  
Dario Feliciangeli ◽  
Simone Rademacher ◽  
Robert Seiringer
Keyword(s):  
Initial Data ◽  
Spectral Gap ◽  
Effective Hamiltonian ◽  
Adiabatic Theorem ◽  
Strongly Coupled

AbstractThe Landau–Pekar equations describe the dynamics of a strongly coupled polaron. Here, we provide a class of initial data for which the associated effective Hamiltonian has a uniform spectral gap for all times. For such initial data, this allows us to extend the results on the adiabatic theorem for the Landau–Pekar equations and their derivation from the Fröhlich model obtained in previous works to larger times.

scholarly journals Ultracold atom interferometry in space

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Maike D. Lachmann ◽  
Holger Ahlers ◽  
Dennis Becker ◽  
Aline N. Dinkelaker ◽  
Jens Grosse ◽  
...  
Keyword(s):  
Spatial Coherence ◽  
Free Fall ◽  
Atom Interferometry ◽  
Matter Wave ◽  
Sounding Rocket ◽  
Ultracold Atom ◽  
Fundamental Physics ◽  
Light Pulses ◽  
Bose Einstein ◽  
Promising Source

AbstractBose-Einstein condensates (BECs) in free fall constitute a promising source for space-borne interferometry. Indeed, BECs enjoy a slowly expanding wave function, display a large spatial coherence and can be engineered and probed by optical techniques. Here we explore matter-wave fringes of multiple spinor components of a BEC released in free fall employing light-pulses to drive Bragg processes and induce phase imprinting on a sounding rocket. The prevailing microgravity played a crucial role in the observation of these interferences which not only reveal the spatial coherence of the condensates but also allow us to measure differential forces. Our work marks the beginning of matter-wave interferometry in space with future applications in fundamental physics, navigation and earth observation.

Analytic Theory of Optimal Plane Change by Low Aerodynamic Forces

1997 ◽  
Vol 45 (3) ◽  
pp. 329-347 ◽  
Author(s):  
Der-Ming Ma ◽  
Chi-Hang Wu ◽  
Nguyen X. Vinh
Keyword(s):  
Analytic Theory ◽  
Aerodynamic Forces ◽  
Plane Change

The Mexican social unconscious—part II: Politics and group analysis

2021 ◽  
pp. 053331642110139
Author(s):  
Reyna Hernández-Tubert
Keyword(s):  
Group Analysis ◽  
Analytic Theory ◽  
The Political ◽  
Political Dimension ◽  
Political Evolution ◽  
Social Unconscious

The origins of the Mexican people and their impact on their social unconscious have been presented in the first part of this article. This second part starts with a discussion of the unavoidable need to include the political dimension in any group-analytic theory and enquiry. It then sketches the socio-political evolution of the country up to the present and its impact on the collective mood and relations among individuals and groups.

Analytic theory for field emission driven microscale gas breakdown for a pin-to-plate geometry

2021 ◽  
Vol 129 (10) ◽  
pp. 103301 ◽  
Author(s):  
Amanda M. Loveless ◽  
Lorin I. Breen ◽  
Allen L. Garner
Keyword(s):  
Field Emission ◽  
Analytic Theory ◽  
Gas Breakdown ◽  
Plate Geometry
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