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Dive into the research topics where A. Rathke is active.

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Featured researches published by A. Rathke.


Experimental Astronomy | 2009

Quantum Physics Exploring Gravity in the Outer Solar System: The SAGAS Project

Peter Wolf; Ch. J. Bordé; A. Clairon; Loic Duchayne; Arnaud Landragin; P. Lemonde; G. Santarelli; W. Ertmer; Ernst M. Rasel; F. S. Cataliotti; M. Inguscio; G. M. Tino; P. Gill; H. A. Klein; Serge Reynaud; C. Salomon; E. Peik; Orfeu Bertolami; P. J. S. Gil; Jorge Páramos; C. Jentsch; Ulrich Johann; A. Rathke; Philippe Bouyer; L. Cacciapuoti; D. Izzo; P. De Natale; Bruno Christophe; Pierre Touboul; Slava G. Turyshev

We summarise the scientific and technological aspects of the Search for Anomalous Gravitation using Atomic Sensors (SAGAS) project, submitted to ESA in June 2007 in response to the Cosmic Vision 2015–2025 call for proposals. The proposed mission aims at flying highly sensitive atomic sensors (optical clock, cold atom accelerometer, optical link) on a Solar System escape trajectory in the 2020 to 2030 time-frame. SAGAS has numerous science objectives in fundamental physics and Solar System science, for example numerous tests of general relativity and the exploration of the Kuiper belt. The combination of highly sensitive atomic sensors and of the laser link well adapted for large distances will allow measurements with unprecedented accuracy and on scales never reached before. We present the proposed mission in some detail, with particular emphasis on the science goals and associated measurements and technologies.


Experimental Astronomy | 2009

Odyssey: A Solar System Mission

Bruno Christophe; P. H. Andersen; John D. Anderson; Sami W. Asmar; Ph. Bério; Orfeu Bertolami; R. Bingham; F. Bondu; Ph. Bouyer; Stefanie Bremer; Jean-Michel Courty; H. Dittus; Bernard Foulon; P. J. S. Gil; Ulrich Johann; J. F. Jordan; B. Kent; Claus Lämmerzahl; Agnès Levy; Gilles Metris; O. Olsen; Jorge Páramos; J. D. Prestage; Sergei V. Progrebenko; Ernst M. Rasel; A. Rathke; Serge Reynaud; Benny Rievers; E. Samain; T. J. Sumner

The Solar System Odyssey mission uses modern-day high-precision experimental techniques to test the laws of fundamental physics which determine dynamics in the solar system. It could lead to major discoveries by using demonstrated technologies and could be flown within the Cosmic Vision time frame. The mission proposes to perform a set of precision gravitation experiments from the vicinity of Earth to the outer Solar System. Its scientific objectives can be summarized as follows: (1) test of the gravity force law in the Solar System up to and beyond the orbit of Saturn; (2) precise investigation of navigation anomalies at the fly-bys; (3) measurement of Eddington’s parameter at occultations; (4) mapping of gravity field in the outer solar system and study of the Kuiper belt. To this aim, the Odyssey mission is built up on a main spacecraft, designed to fly up to 13 AU, with the following components: (a) a high-precision accelerometer, with bias-rejection system, measuring the deviation of the trajectory from the geodesics, that is also giving gravitational forces; (b) Ka-band transponders, as for Cassini, for a precise range and Doppler measurement up to 13 AU, with additional VLBI equipment; (c) optional laser equipment, which would allow one to improve the range and Doppler measurement, resulting in particular in an improved measurement (with respect to Cassini) of the Eddington’s parameter. In this baseline concept, the main spacecraft is designed to operate beyond the Saturn orbit, up to 13 AU. It experiences multiple planetary fly-bys at Earth, Mars or Venus, and Jupiter. The cruise and fly-by phases allow the mission to achieve its baseline scientific objectives [(1) to (3) in the above list]. In addition to this baseline concept, the Odyssey mission proposes the release of the Enigma radio-beacon at Saturn, allowing one to extend the deep space gravity test up to at least 50 AU, while achieving the scientific objective of a mapping of gravity field in the outer Solar System [(4) in the above list].


Physical Review D | 2003

Nonlocal braneworld action: An alternative to the Kaluza-Klein description

Andrei O. Barvinsky; Alexander Yu. Kamenshchik; A. Rathke; Claus Kiefer

We construct the nonlocal braneworld action in the two-brane Randall-Sundrum model in a holographic setup alternative to Kaluza-Klein description: the action is written as a functional of the two metric and radion fields on the branes. This action effectively describes the dynamics of the gravitational field both on the branes and in the bulk in terms of the brane geometries directly accessible for observations. Its nonlocal form factors incorporate the cumulative effect of the bulk Kaluza-Klein modes. We also consider the reduced version of this action obtained by integrating out the fields on the negative-tension brane invisible from the viewpoint of the Planckian brane observer. This effective action features a nontrivial transition (AdS flow) between the local and nonlocal phases of the theory associated with the limits of small and large interbrane separation. Our results confirm a recently proposed braneworld scenario with diverging (repulsive) branes and suggest possible new implications of this phase transition in brane cosmology.


Physics Letters B | 2003

Graviton oscillations in the two-brane world

Andrei O. Barvinsky; Alexander Yu. Kamenshchik; Claus Kiefer; A. Rathke

Abstract We study the braneworld effective action in the two-brane Randall–Sundrum model. In the framework of this essentially-non-local action we reveal the origin of an infinite sequence of gravitational wave modes—the usual massless one as well as the tower of Kaluza–Klein massive ones. Mixing of the modes, which parametrically depends on the background value of the modulus of the extra dimension, can be interpreted as radion-induced gravitational-wave oscillations, a classical analogue to meson and neutrino oscillations. We show that these oscillations arising in M-theory-inspired braneworld setups could lead to effects detectable by gravitational-wave interferometers.


Annalen der Physik | 2003

Radion-induced gravitational wave oscillations and their phenomenology

Andrei O. Barvinsky; A. Yu. Kamenshchik; A. Rathke; Claus Kiefer

We discuss the theory and phenomenology of the interplay between the massless graviton and its massive Kaluza-Klein modes in the Randall-Sundrum two-brane model. The equations of motion of the transverse traceless degrees of freedom are derived by means of a Green function approach as well as from an effective nonlocal action. The second procedure clarifies the extraction of the particle content from the nonlocal action and the issue of its diagonalization. The situation discussed is generic for the treatment of two-brane models if the on-brane fields are used as the dynamical degrees of freedom. The mixing of the effective graviton modes of the localized action can be interpreted as radion-induced gravitational-wave oscillations, a classical analogy to meson and neutrino oscillations. We show that these oscillations arising in M-theory-motivated braneworld setups could lead to effects detectable by gravitational-wave interferometers. The implications of this effect for models with ultra-light gravitons are discussed.


ESA Spec.Publ. | 2005

A Mission to explore the Pioneer anomaly

H. Dittus; Bruno Christophe; John D. Anderson; E.E. Lau; W. Ertmer; Pierre Touboul; F. Bondu; Claus Kiefer; A. Brillet; T. J. Sumner; Claus Lämmerzahl; Friedrich W. Hehl; C. J. de Matos; H.-J. Blome; Orfeu Bertolami; C. Erd; Stephan Theil; A. Rathke; Slava G. Turyshev; Jorge Páramos; B. Kent; Jutta Kunz; Serge Reynaud; D. Giulini; R. Bingham; Dario Izzo; Bernd Dachwald; Philippe Bouyer; Sami W. Asmar; J.C. Grenouilleau


Experimental Astronomy | 2009

Matter Wave Explorer of Gravity (MWXG)

W. Ertmer; Christian Schubert; Thijs Wendrich; M. Gilowski; M. Zaiser; Tim van Zoest; Ernst M. Rasel; Ch. J. Bordé; A. Clairon; Landragin; P. Laurent; P. Lemonde; G. Santarelli; Wolfgang P. Schleich; F. S. Cataliotti; M. Inguscio; N. Poli; F. Sorrentino; C. Modugno; G. M. Tino; P. Gill; H. A. Klein; Helen S. Margolis; Serge Reynaud; C. Salomon; Astrid Lambrecht; E. Peik; C. Jentsch; Ulrich Johann; A. Rathke


arXiv: General Relativity and Quantum Cosmology | 2005

A MISSION TO EXPLORE THE PIONEER ANOMALY

H. Dittus; Slava G. Turyshev; Claus Lämmerzahl; Stephan Theil; R. Foerstner; U. Johann; W. Ertmer; Ernst M. Rasel; Bernd Dachwald; W. Seboldt; Friedrich W. Hehl; Claus Kiefer; H.-J. Blome; Jutta Kunz; Domenico Giulini; R. Bingham; B. Kent; T. J. Sumner; Orfeu Bertolami; Jorge Páramos; J.L. Rosales; Christophe Benavent; Bernard Foulon; Pierre Touboul; Philippe Bouyer; Serge Reynaud; A. Brillet; F. Bondu; E. Samain; C. J. de Matos


ESA Spec.Publ. | 2005

Fundamental physics with the laser astrometric test of relativity

Slava G. Turyshev; Bruno Christophe; R.W.P. Drever; A. Brillet; M. Soffel; W. Ertmer; Kenneth Nordtvedt; I. Shapiro; Pierre Touboul; F. Bondu; M. Sandford; T. J. Sumner; C. Lämmerzahl; J.E. Plowman; Volker Perlick; Thibault Damour; L. Iess; Michael Shao; Orfeu Bertolami; C. Erd; Stephan Theil; H. Dittus; Sergei A. Klioner; Jorge Páramos; B. Kent; Serge Reynaud; T.W. Murphy; R. Bingham; Dario Izzo; R. Reasenberg


Archive | 2002

Braneworld effective action: An alternative to Kaluza-Klein reduction

Andrei O. Barvinsky; Alexander Yu. Kamenshchik; A. Rathke; Claus Kiefer

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Andrei O. Barvinsky

University of British Columbia

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Jorge Páramos

Instituto Superior Técnico

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Slava G. Turyshev

Rochester Institute of Technology

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B. Kent

Rutherford Appleton Laboratory

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R. Bingham

Rutherford Appleton Laboratory

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T. J. Sumner

Imperial College London

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Pierre Touboul

Office National d'Études et de Recherches Aérospatiales

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