Pierre Auclair PhD

Chargé de Recherche CNRS, Institut d'Astrophysique de Paris, France

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About me

  • Study cosmology and the early Universe
  • Specialized in topological defects, first order phase transitions and primordial black-holes
  • Passionate about computer sciences
  • Grew up in the Alps, loves hiking and rock climbing.
  • Member of the Virgo collaboration and LISA consortium

Blog posts


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Physics Project Days 2025 : physique des trous noirs

EDIBlack holePhysics
09 September 2025

Cette année, nous organisions la troisième édition des Physics Project Days à Louvain-la-Neuve avec, pour la première fois, une déclinaison en mathématiques : les [Maths Projects Days](https://www.uclouvain.be/fr/facultes/sc/maths-project-days) !
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QEIOS, an alternative to traditional academic journals?

OpinionQEIOSPublication
16 January 2025

Today, I received an invitation to review a preprint on QEIOS.com. As a researcher, I value a lot my activity as referee in scientific journals. The peer-review process is painful but necessary to scientific research. Nonetheless, I also receive this kind of invitations every day from predatory journals. These invitations usually end-up in my SPAM folder, and so did this email from QEIOS.
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Découverte du fond stochastique d'ondes gravitationnelles

OGcosmologiepta
03 July 2023

Plusieurs collaborations internationales en
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Random Apollonian Packing II : Simulations en deux dimensions

PythonRAPFractalPacking
15 March 2023

Nous avons vu dans un précédent billet comment dessiner la fractale du cercle d'Apollonius, un empilement de sphères déterministe en deux dimensions.
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Random Apollonian Packing I : Cercle d'Apollonius

PythonApolloniusFractalPacking
14 March 2023

À l'occasion de la publication de mon article dans la revue "Physical Review E", j'entame aujourd'hui une série de billets pour retracer l'historique de ce projet et pour aborder toutes sortes de problèmes mathématiques intéressants (tout du moins, pour moi).
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La respiration de Paris III : classification automatique non supervisée

PythonVelibTslearnPandasGeoPandas
28 July 2021

Ce billet est le dernier de notre série sur les données publiques Vélib. Dans un premier temps, nous avons vu comment acquérir et enregistrer ces données avec Python et Pandas. Et dans un [second temps]({{ url_for('blog.page', path="velibs2") }}), comment représenter ces données graphiquement avec l'aide de GeoPandas. Ce faisant, nous avons pu "voir" Paris respirer pendant $24$ heures consécutives et identifier à l'oeil nu les différents types de quartier dans la capitale.
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La respiration de Paris II : GeoPandas pour l'analyse de données spatiales

PythonVelibPandasGeopandas
24 June 2021

Dans un précédent billet, je vous ai montré comment lancer une acquisition des données Vélib en utilisant Python et la librairie Pandas et comment effectuer des manipulations simples. Commençons par charger ces données et par faire une jointure entre nos deux tables. Si vous avez besoin d'un rappel, vous pouvez consulter le précédent billet.
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La respiration de Paris I : acquisition des données Vélib avec Python et Pandas

PythonVelibPandas
22 June 2021

Avec le retour des beaux jours et la fin des mesures de confinement, le temps est particulièrement propice aux déplacements à vélo dans la capitale. Comme une bonne partie de la population parisienne, je ne possède pas moi-même de voiture ni de vélo. Pour me déplacer, j'utilise soit les transports en communs soit les **Vélibs** quand la météo est clémente. Les Vélibs, ce sont les vélos en libre-service de Paris. Le principe est simple : un utilisateur retire un vélo dans une station et le dépose dans une autre station située à proximité de sa destination. Ce service fonctionne grâce à la forte densité de stations - environ $1400$ à l'heure où j'écris ces lignes - ce qui signifie qu'il y a toujours une station à proximité.

Publication list


LISA Definition Study Report

Colpi, Monica et al.

First released on 12 February 2024

astro-ph.CO astro-ph.GA astro-ph.HE astro-ph.IM astro-ph.SR gr-qc

10 last citations


Basilic: An end-to-end pipeline for Bayesian burst inference and model classification in gravitational-wave data

Cuceu, Iuliu; Bizouard, Marie Anne.

Probing Scalar-Tensor-Induced Gravitational Waves in the nHz Band: $\texttt{NANOGrav}$ and SKA

Iania, William; Ricciardone, Angelo.

Axial Oscillations of Viscous Neutron Stars

Bussières, Sofía; Redondo-Yuste, Jaime; Ortega Gómez, José Javier; Cardoso, Vitor.

Novel ringdown tests of general relativity with black hole greybody factors

Rosato, Romeo Felice; Crescimbeni, Francesco; Yi, Sophia; Berti, Emanuele; Pani, Paolo.

Relativistic signatures of scalar dark matter in extreme-mass-ratio inspirals

Keijzer, Robrecht; Maenaut, Simon; Inchauspé, Henri; Hertog, Thomas.

Post-Newtonian inspiral waveform model for eccentric precessing binaries with higher-order modes and matter effects

Morras, Gonzalo; Pratten, Geraint; Schmidt, Patricia; Buonanno, Alessandra.

Not too close! Evaluating the impact of the baseline on the localization of binary black holes by next-generation gravitational-wave detectors

Iacovelli, Francesco; Reali, Luca; Berti, Emanuele; Corsi, Alessandra; Sathyaprakash, B.S.; Wadekar, Digvijay.

Gravitational Memory from Hairy Binary Black Hole Mergers

Gasparotto, Silvia; Zosso, Jann; Aresté Saló, Llibert; Doneva, Daniela D.; Yazadjiev, Stoytcho S..

Black Hole Dynamics at Fifth Post-Newtonian Order

Porto, Rafael A.; Riva, Massimiliano M..

Probing the Kinematic Dipole with LISA: an analytical treatment

Fumagalli, Jacopo; Cusin, Giulia; Pitrou, Cyril; Tasinato, Gianmassimo.

Seminars and conferences


Make this Notebook Trusted to load map: File -> Trust Notebook

Université Catholique de Louvain
Seminar on the subject :
Excursion-set for Primordial Black Holes I: white noise and moving barrier

IAP
Greco Seminar on the subject :
Harvesting primordial black holes from stochastic trees with FOREST

IAP
Colloquium on the subject :
An introduction to cosmic strings: a decade in the gravitational wave era

IPhT Saclay
Conference on the subject :
Cosmic strings: a decade in the gravitational wave era

Workshop: Numerical Simulations of Early Universe Sources of Gravitational Waves, Nordita
Conference on the subject :
Cosmic string loop fragmentation

Institut Pascal, Orsay
Conference on the subject :
Harvesting primordial black holes from stochastic trees with FOREST

Copernicus Webinar and Colloquium series
Webinar on the subject :
Harvesting primordial black holes from stochastic trees with FOREST

Van Swinderen Institute, Groningen
Seminar on the subject :
Harvesting primordial black holes from stochastic trees with FOREST

LUPM, Montpellier
Seminar on the subject :
Harvesting primordial black holes from stochastic trees with FOREST

LAPTh
Conference on the subject :
Small-scale clustering of PBHs

CERN
Conference on the subject :
Slow-roll inflation at N3LO (as a deviation from a de Sitter background)

KULeuven
Conference on the subject :
Stochastic gravitational wave detection: a year after

University of Manchester
Workshop on the subject :
Gravitational wave observations with PTA and cosmic strings

ENS Lyon
Seminar on the subject :
Spatial Curvature from Super-Hubble Cosmological Fluctuations

CP3, UCLouvain
Seminar on the subject :
Gravitational Wave observations with PTA, can cosmic strings explain the signal?

LUPM, Montpellier
Seminar on the subject :
Gravitational Wave observations with PTA, can cosmic strings explain the signal?

DAMTP, Cambridge
Seminar on the subject :
Gravitational Wave observations with PTA, can cosmic strings explain the signal?

LPENS
Talk on the subject :
Spatial Curvature from Super-Hubble Cosmological Fluctuations

Institute of Basic Sciences
Talk on the subject :
Gravitational wave observations with PTA and loop fragmentation

Université Libre de Bruxelles
Talk on the subject :
Gravitational wave observations with PTA

LAPTh
Seminar on the subject :
Sub- and super-Hubble fluctuations from cosmic inflation

ENS - Graces
Seminar on the subject :
Slow-roll inflation at N3LO

IAP - Greco
Seminar on the subject :
Slow-roll inflation at N3LO

UCLouvain
Poster on the subject :
Generation of gravitational waves from freely decaying turbulence

University of Glasgow
Pre-recorded talk on the subject :
Generation of gravitational waves from freely decaying turbulence

King's College London
Talk on the subject :
Generation of gravitational waves from freely decaying turbulence

Université Libre de Bruxelles
Online presentation on the subject :
Primordial black holes from metric preheating: mass fraction in the excursion-set approach

Université Catholique de Louvain
Seminar on the subject :
Population of cosmic strings and gravitational waves

Laboratoire APC
PhD defense on the subject :
Primordial cosmology and gravitational waves: from phase transitions to cosmic strings and primordial black holes

LVK collaboration
Webinar on the subject :
Listening for signals from the distant Universe

Laboratoire APC, groupe théorie
Online seminar on the subject :
Primordial black holes from metric preheating: mass fraction in the excursion-set approach

Department of Theoretical Physics, UPV/EHU, Bilbao
Online seminar on the subject :
Primordial black holes from metric preheating: mass fraction in the excursion-set approach

Instituto de Física Teórica, Universidad Autónoma de Madrid
Online seminar on the subject :
Primordial black holes from metric preheating: mass fraction in the excursion-set approach

Institut de FIsica Corpuscular
Online seminar on the subject :
Constraints on cosmic strings from gravitational waves, diffuse gamma-ray background and dark matter

Theoretical Particle Physics & Cosmology group at King's College London
Online seminar on the subject :
Constraints on cosmic strings from gravitational waves, diffuse gamma-ray background and dark matter

Institute of Cosmology & Gravitation, University of Portsmouth
Online seminar on the subject :
Constraints on cosmic strings from gravitational waves, diffuse gamma-ray background and dark matter

University of Oxford
Online presentation on the subject :
TBA

Zooming in on Strings and Vortons, CERN
Online presentation on the subject :
Irreducible cosmic production of relic vortons

DESY, University of Hamburg
Online seminar on the subject :
Constraints on cosmic strings from gravitational waves, diffuse gamma-ray background and dark matter

Troisième AG du groupe de recherche Ondes Gravitationnelles
Online presentation on the subject :
Cordes cosmiques, ondes gravitationnelles et abondance des vortons

Theoretical subatomic physics and cosmology, University of Stavanger
Online seminar on the subject :
Constraints on cosmic strings from gravitational waves, diffuse gamma-ray background and dark matter

Particle Cosmology and Quantum Gravity groups, University of Nottingham
Online seminar on the subject :
Constraints on cosmic strings from gravitational waves, diffuse gamma-ray background and dark matter

Institut d'Astrophysique de Paris, Séminaire du GReCO
Seminar on the subject :
Probing cosmic string networks with gravitational waves

Laboratoire APC, groupe théorie
Seminar on the subject :
Probing cosmic string networks with gravitational waves

3rd Paris Primordial Cosmology Meetings
Talk on the subject :
Particle emission and gravitational radiation from cosmic strings: observational constraints

Deuxième Assemblée Générale du GdR Ondes Gravitationnelles
Talk on the subject :
Latest observational signatures of cosmic strings: gravitational waves and particle emission

Workshop: Gravitational Waves from the Early Universe, Nordita
Talk on the subject :
Latest observational signatures of cosmic strings: gravitational waves and particle emission

University of Helsinki
Seminar on the subject :
Cosmic strings and gravitational waves

PhD Student Conference organized by the STEP'UP doctoral school
Poster on the subject :
Gravitational waves from cosmic strings : relics of the early Universe

6th LISA Cosmology Working Group Workshop, Institute of Theoretical Physics (IFT) in Madrid
Talk on the subject :
Results from the LISA cosmic string working group: Constraints on the string tension from stochastic GW background