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Search Results: 1 - 10 of 473172 matches for " M. -T. Jaekel "
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Generating photon pulses with an oscillating cavity
A. Lambrecht,M. T. Jaekel,S. Reynaud
Physics , 1998, DOI: 10.1209/epl/i1998-00333-0
Abstract: We study the generation of photon pulses from thermal field fluctuations through opto-mechanical coupling to a cavity with an oscillatory motion. Pulses are regularly spaced and become sharp for a high finesse cavity.
The Casimir force for passive mirrors
A. Lambrecht,M. -T. Jaekel,S. Reynaud
Physics , 1998, DOI: 10.1016/S0375-9601(96)00885-7
Abstract: We show that the Casimir force between mirrors with arbitrary frequency dependent reflectivities obeys bounds due to causality and passivity properties. The force is always smaller than the Casimir force between two perfectly reflecting mirrors. For narrow-band mirrors in particular, the force is found to decrease with the mirrors bandwidth.
Frequency up-converted radiation from a cavity moving in vacuum
A. Lambrecht,M. T. Jaekel,S. Reynaud
Physics , 1998, DOI: 10.1007/s100530050152
Abstract: We calculate the photon emission of a high finesse cavity moving in vacuum. The cavity is treated as an open system. The field initially in the vacuum state accumulates a dephasing depending on the mirrors motion when bouncing back and forth inside the cavity. The dephasing is not linearized in our calculation, so that qualitatively new effects like pulse shaping in the time domain and frequency up-conversion in the spectrum are found. Furthermore we predict the existence of a threshold above which the system should show self-sustained oscillations.
Testing gravity law in the solar system
B. Lamine,J. -M. Courty,S. Reynaud,M. -T. Jaekel
Physics , 2011,
Abstract: The predictions of General relativity (GR) are in good agreement with observations in the solar system. Nevertheless, unexpected anomalies appeared during the last decades, along with the increasing precision of measurements. Those anomalies are present in spacecraft tracking data (Pioneer and flyby anomalies) as well as ephemerides. In addition, the whole theory is challenged at galactic and cosmic scales with the dark matter and dark energy issues. Finally, the unification in the framework of quantum field theories remains an open question, whose solution will certainly lead to modifications of the theory, even at large distances. As long as those "dark sides" of the universe have no universally accepted interpretation nor are they observed through other means than the gravitational anomalies they have been designed to cure, these anomalies may as well be interpreted as deviations from GR. In this context, there is a strong motivation for improved and more systematic tests of GR inside the solar system, with the aim to bridge the gap between gravity experiments in the solar system and observations at much larger scales. We review a family of metric extensions of GR which preserve the equivalence principle but modify the coupling between energy and curvature and provide a phenomenological framework which generalizes the PPN framework and "fifth force" extensions of GR. We briefly discuss some possible observational consequences in connection with highly accurate ephemerides.
Large scale EPR correlations and cosmic gravitational waves
B. Lamine,R. Hervé,M. -T. Jaekel,A. Lambrecht,S. Reynaud
Physics , 2011, DOI: 10.1209/0295-5075/95/20004
Abstract: We study how quantum correlations survive at large scales in spite of their exposition to stochastic backgrounds of gravitational waves. We consider Einstein-Podolski-Rosen (EPR) correlations built up on the polarizations of photon pairs and evaluate how they are affected by the cosmic gravitational wave background (CGWB). We evaluate the quantum decoherence of the EPR correlations in terms of a reduction of the violation of the Bell inequality as written by Clauser, Horne, Shimony and Holt (CHSH). We show that this decoherence remains small and that EPR correlations can in principle survive up to the largest cosmic scales.
Testing Gravitation in the Solar System with Radio Science experiments
A. Hees,P. Wolf,B. Lamine,S. Reynaud,M. T. Jaekel,C. Le Poncin-Lafitte,V. Lainey,V. Dehant
Physics , 2011,
Abstract: The laws of gravitation have been tested for a long time with steadily improving precision, leading at some moment of time to paradigmatic evolutions. Pursuing this continual effort is of great importance for science. In this communication, we focus on Solar System tests of gravity and more precisely on possible tests that can be performed with radio science observations (Range and Doppler). After briefly reviewing the current tests of gravitation at Solar System scales, we give motivations to continue such experiments. In order to obtain signature and estimate the amplitude of anomalous signals that could show up in radio science observables because of modified gravitational laws, we developed a new software that simulates Range/Doppler signals. We present this new tool that simulates radio science observables directly from the space-time metric. We apply this tool to the Cassini mission during its cruise from Jupiter to Saturn and derive constraints on the parameters entering alternative theories of gravity beyond the standard Parametrized Post Newtonian theory.
Radioscience simulations in General Relativity and in alternative theories of gravity
A. Hees,B. Lamine,S. Reynaud,M. -T. Jaekel,C. Le Poncin-Lafitte,V. Lainey,A. Füzfa,J. -M. Courty,V. Dehant,P. Wolf
Physics , 2012, DOI: 10.1088/0264-9381/29/23/235027
Abstract: In this paper, we focus on the possibility to test General Relativity in the Solar System with radioscience measurements. To this aim, we present a new software that simulates Range and Doppler signals directly from the space-time metric. This flexible approach allows one to perform simulations in General Relativity and in alternative metric theories of gravity. In a second step, a least-squares fit of the different initial conditions involved in the situation is performed in order to compare anomalous signals produced by a given alternative theory with the ones obtained in General Relativity. This software provides orders of magnitude and signatures stemming from hypothetical alternative theories of gravity on radioscience signals. As an application, we present some simulations done for the Cassini mission in Post-Einsteinian Gravity and in the context of MOND External Field Effect. We deduce constraints on the Post-Einsteinian parameters but find that the considered arc of the Cassini mission is not useful to constrain the MOND External Field Effect.
Simulations of Solar System observations in alternative theories of gravity
A. Hees,B. Lamine,S. Reynaud,M. -T. Jaekel,C. Le Poncin-Lafitte,V. Lainey,A. Füzfa,J. -M. Courty,V. Dehant,P. Wolf
Physics , 2013, DOI: 10.1142/9789814623995_0440
Abstract: In this communication, we focus on the possibility to test General Relativity (GR) with radioscience experiments. We present simulations of observables performed in alternative theories of gravity using a software that simulates Range/Doppler signals directly from the space time metric. This software allows one to get the order of magnitude and the signature of the modifications induced by an alternative theory of gravity on radioscience signals. As examples, we present some simulations for the Cassini mission in Post-Einsteinian gravity (PEG) and with Standard Model Extension (SME).
Cluster Estimates for Modular Structures
Christian Jaekel
Physics , 1998,
Abstract: The basic ingredients of Tomita-Takesaki modular theory are used to establish cluster estimates. Applications to thermal quantum field theory are discussed.
Some Comments on Entanglement and Local Thermofield Theory
Christian Jaekel
Physics , 2004,
Abstract: We combine recent results of Clifton and Halvorson [1] with structural results of the author [2--5] concerning the local observables in thermofield theory. An number of interesting consequences are discussed.
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