artemis publications

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HAL : Dernières publications

HAL : Dernières publications
  • [hal-02564555] Identifying and Addressing Nonstationary LISA Noise
    We anticipate noise from the Laser Interferometer Space Antenna (LISA) will exhibit nonstationarities throughout the duration of its mission due to factors such as antenna repointing, cyclostationarities from spacecraft motion, and glitches as highlighted by LISA Pathfinder. In this paper, we use a surrogate data approach to test the stationarity of a time series which does not rely on the Gaussianity assumption. The main goal is to identify noise nonstationarities in the future LISA mission. This will be necessary for determining how often the LISA noise power spectral density (PSD) will need to be updated for parameter estimation routines. We conduct a thorough simulation study illustrating the power/size of various versions of the hypothesis tests and then apply these approaches to differential acceleration measurements from LISA Pathfinder. We also develop a data analysis strategy for addressing nonstationarities in the LISA PSD, where we update the noise PSD over time, while simultaneously conducting parameter estimation, with a focus on planned data gaps.
  • [hal-02475263] Gaussian processes for the interpolation and marginalization of waveform error in extreme-mass-ratio-inspiral parameter estimation
    A number of open problems hinder our present ability to extract scientific information from data that will be gathered by the near-future gravitational-wave mission LISA. Many of these relate to the modeling, detection, and characterization of signals from binary inspirals with an extreme component-mass ratio of ≲10-4. In this paper, we draw attention to the issue of systematic error in parameter estimation due to the use of fast but approximate waveform models; this is found to be relevant for extreme-mass-ratio inspirals even in the case of waveforms with ≳90% overlap accuracy and moderate (≳30) signal-to-noise ratios. A scheme that uses Gaussian processes to interpolate and marginalize over waveform error is adapted and investigated as a possible precursor solution to this problem. Several new methodological results are obtained, and the viability of the technique is successfully demonstrated on a three-parameter example in the setting of the LISA Data Challenge.
  • [hal-02892956] Constraint on the Yukawa suppression of the Newtonian potential from the planetary ephemeris INPOP19a
    We use the latest solution of the ephemeris INPOP (19a) in order to improve our previous constraint on the existence of a Yukawa suppression to the Newtonian potential, generically associated to a graviton’s mass. Unlike the ephemeris INPOP17a, several residuals are found to degrade significantly at roughly the same amplitudes of the Compton wavelength λg. As a consequence, we introduce a novel statistical criterion in order to derive the constraint with INPOP19a. After checking that it leads to a constraint consistent with our previous result when applied on INPOP17b, we apply the method to the new solution INPOP19a. We show that the residuals of Mars orbiters, Cassini, Messenger, and Juno, degrade significantly when λg≤3.43×1013 km with a 99.7% confidence level—corresponding to a graviton mass bigger than 3.62×10-23 eV/c2. This is a stronger constraint on the Compton wavelength than the one obtained from the first gravitational-wave transient catalog by the LIGO-Virgo Collaboration in the radiative regime, since our 90% C.L. limit reads λg>3.93×1013 km (mg<3.16×10-23 eV/c2).

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L'Agenda d'Artémis

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Seismic isolation for ground-based gravitational-wave detectors is a hot topic for opening the low frequency window of detection. At the Precision Mechatronics Laboratory in Liège (Be), advanced technologies for 3rd generation detectors is under study, and a prototype (E-TEST) is under construction to validate the technology for the Einstein Telescope. I will present our activities.
  • Jeudi 19 Octobre 2023 10h30: Overcoming SQL: ultracold atoms as a negative effective mass par Dylan Sabulsky (LSSB, UAM)

Is it possible to utilize an ultracold atomic spin system as a negative effective mass to improve frequency metrology as well as the sensitivity of modern GW detectors? Experiment protocols mixing such long lived ensembles with entangled photons allows for the counterbalancing of quantum backaction in an optical cavity, with the possibility of going well past the Standard Quantum Limit (SQL). Here, we briefly cover this new application of quantum technology and discuss possible implications for the next generation of laser interferometers, laboratory frequency metrology, as well as precision fundamental physics measurements.

The gravitational wave - pulsar timing community will be making a major announcement on June 29. Professor Joe Romano, Texas Tech University, will give a seminar on June 30, 10h30, in the NEF. Prof. Romano is a member of the NANOGrav Collaboration and will summarize the results presented on June 29.

  • Jeudi 9 Mars 2023 10h30: Multi-messenger emission from core-collapse supernovae: impact of rotation and magnetic fields par Matteo Bugli, AIM/CEA Saclay
  • Jeudi 13 Octobre 2022 à 10h30: "Multimessager analysis with neutrinos" par Damien Dornic, CPPM, University Aix Marseille
  • Jeudi 12 Mai 2022 à 10h30: "Unraveling neutron star interiors with multimessenger observables" par Geert Raaijmakers, University Vreui Amsterdam
  • Jeudi 31 mars 2022: "Electromagnetic counterparts of binary neutron star mergers: perspectives for future detections & multi-messenger studies " par  Frederic Daigne, Institut d'Astrophysique de Paris
  • Jeudi 24 mars 2022  "The hosts and environments of explosive transients" par Christina Thoene, Astronomical Institute of the Czech Academy of Sciences
  • Jeudi 18 Novembre 2021 à 10h30: "La relativité intriquée" par Olivier Minazzoli, Artemis/Centre Scientifique de Monaco

Les incontestables et considérables succès de la relativité générale, formulée en 1915 par Albert Einstein, tranche avec la volonté de ce dernier de modifier sa théorie dès les années 1920. Il y consacra d’ailleurs l’essentiel de sa recherche jusqu’à la veille de sa mort en 1955 à Princeton. Ses raisons pour vouloir modifier la relativité générale ont été multiples et fluctuantes, mais partageaient toutes le même espoir de retrouver la relativité générale comme limite d’une nouvelle théorie plus générale encore. Dans cet exposé, je présenterai les principaux motifs pour lesquels la communauté scientifique pense que la relativité générale pourrait (ou devrait) être améliorée, avant de présenter une nouvelle théorie générale de la relativité qui semble avoir le potentiel pour cela : la relativité intriquée.

  • Jeudi 14 Octobre 2021 à 10h30: "A multi-messenger astronomy eco-system" par Michael Coughlin, University of Minnessota

With the detection of compact binary coalescences and their electromagnetic counterparts by gravitational-wave detectors, a new era of multi-messenger astronomy has begun. In this talk, I will describe how GW170817, our first example in this new class, is being used to constrain the unknown equation of state of cold supranuclear matter, and to measure the Hubble constant. I will then discuss how current ground based optical surveys and dedicated follow-up systems are being used to identify more of these, and how we are developing models to test what we find. We will close with near-term prospects
for the field.


 

One year "Research Engineer" position in photonics/lasers at the Artemis Laboratory

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Le Laboratoire ARTEMIS recrute un Ingénieur de recherche Photonique/Lasers, CDI de 1 an

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One year "Research Engineer" position in photonics/lasers at the Artemis Laboratory

Détails

[english version below]

Le Laboratoire ARTEMIS recrute un Ingénieur de recherche Photonique/Lasers, CDI de 1 an

Lire la suite...

Bienvenue chez Artémis

Détails

L’unité de recherche Artemis réunit des spécialistes des lasers et du traitement du signal, des mathématiciens, des astrophysiciens des objets compacts pour créer une antenne d’un type nouveau, détectant des signaux encore jamais détectés : Virgo. Depuis 1999, sa conception, la modélisation de sources cosmiques et de leurs signaux sont au coeur de l’activité d’Artemis.

Virgo est un détecteur de l’extrême dont les performances reposent en premier lieu sur les propriétés exceptionnelles des lasers et des miroirs. C’est au CSNSM et au LAL, à Orsay que ces méthodes utilisées aujourd’hui ont été développés sous la direction d’Alain Brillet, avant que l’équipe ne rejoigne l’Observatoire de la Côte d’Azur.Le design optique de Virgo a été guidé par la modélisation initiée et développée par Jean-Yves VINET et Jean-Daniel FOURNIER. Celle-ci est toujours utilisée pour les développements actuels.

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