{"id":8,"date":"2021-04-15T17:21:23","date_gmt":"2021-04-15T16:21:23","guid":{"rendered":"https:\/\/gvoisin817899550.wordpress.com\/?page_id=5"},"modified":"2026-01-21T16:17:55","modified_gmt":"2026-01-21T16:17:55","slug":"home","status":"publish","type":"page","link":"https:\/\/people-lux.obspm.fr\/gvoisin\/","title":{"rendered":"In Brief"},"content":{"rendered":"\n<div class=\"wp-block-jetpack-layout-grid alignfull column1-desktop-grid__span-12 column1-desktop-grid__row-1 column1-tablet-grid__span-8 column1-tablet-grid__row-1 column1-mobile-grid__span-4 column1-mobile-grid__row-1\">\n<div class=\"wp-block-jetpack-layout-grid-column wp-block-jetpack-layout-grid__padding-none is-vertically-aligned-bottom\">\n<h2 class=\"wp-block-heading has-text-align-left\" id=\"what-s-up\"><strong>What&#8217;s up ? <\/strong><\/h2>\n\n\n\n<p>2025:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>(03\/09\/2025) New paper ! <a href=\"https:\/\/doi.org\/10.1051\/0004-6361\/202555207\">Evidence of the association of repeating fast-radio-burst sources with fast-spinning super-twisted magnetars, Voisin &amp; Francez, A&amp;A 2025<\/a><\/li>\n\n\n\n<li>(07-11\/04\/2025) Talk &#8220;<a href=\"https:\/\/share.obspm.fr\/s\/YTDyjGoiAK8FAWq\" target=\"_blank\" rel=\"noreferrer noopener\">A new class of force-free semi-analytical solutions of the twisted magnetar magnetosphere<\/a>&#8221; at <a href=\"https:\/\/r-magnetosphere.sciencesconf.org\/\" target=\"_blank\" rel=\"noreferrer noopener\">Feeling the pull and the pulse of relativistic magnetospheres<\/a>, Les Houches, France<\/li>\n<\/ul>\n\n\n\n<p>2024:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>(07\/11\/2024) Invited talk &#8220;<a href=\"https:\/\/indico.in2p3.fr\/event\/32157\/overview\">Journ\u00e9es th\u00e9ories du PNHE<\/a>&#8220;, Paris, France<\/li>\n\n\n\n<li>(22\/08\/2024) Invited talk &#8220;<a href=\"https:\/\/share.obspm.fr\/s\/2eBDroY63rtR8kx\" data-type=\"link\" data-id=\"https:\/\/share.obspm.fr\/s\/2eBDroY63rtR8kx\" target=\"_blank\" rel=\"noreferrer noopener\">Electrodynamics of neutron-star magnetospheres: focus on quantum effects<\/a>&#8221; at the French-German WE-Heraeus-Seminar: Developments, Problems, and Extensions of Electrodynamics, Bad Honnef, Germany<\/li>\n\n\n\n<li>(16\/05\/2024) \u00ab <a href=\"https:\/\/share.obspm.fr\/s\/wBgpyWybxWcwP8N\" target=\"_blank\" rel=\"noreferrer noopener\">Geometrical envelopes of Fast Radio Bursts<\/a> \u00bb, Bonn workshop on \u00ab Advancing pulsar science: opportunities, challenges &amp; mysteries \u00bb, Germany<\/li>\n<\/ul>\n\n\n\n<p>September 2023:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Talk &#8220;<a href=\"https:\/\/share.obspm.fr\/s\/S5zGyF2zbRA8jMn\">Geometrical envelope of fast radio bursts<\/a>&#8221; at Journ\u00e9es du PNHE, IAP, France.<\/li>\n\n\n\n<li>Colloquium &#8220;<a href=\"https:\/\/share.obspm.fr\/s\/XR8AB3tTMRytFqe\">What can be learnt from unusual pulsar systems<\/a>&#8221; at LPC2E, Orl\u00e9ans, France. <\/li>\n<\/ul>\n\n\n\n<p>June 2023:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Paper &#8220;<a href=\"https:\/\/dx.doi.org\/10.1051\/0004-6361\/202346544\">Geometrical envelopes of Fast Radio Bursts<\/a>&#8221; published (<a href=\"https:\/\/hal.science\/hal-04113116\">hal<\/a>);<\/li>\n\n\n\n<li><a href=\"https:\/\/astrotube.obspm.fr\/w\/f9SxoEzzc2bBvc5KjXAKQv\" target=\"_blank\" rel=\"noreferrer noopener\">Animation<\/a> illustrating the model relating FRB dynamic spectra with magnetospheric dynamics; <\/li>\n\n\n\n<li><a rel=\"noreferrer noopener\" href=\"https:\/\/share.obspm.fr\/s\/iFHsFo4y9M6M2MM\" target=\"_blank\">Slide of flash talk given at the SF2A 2023 <\/a>meeting available.<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"about-me\">About me<\/h3>\n\n\n\n<p>I am an astrophysicist working for the CNRS at Laboratory for the study of the Universe and eXtreme phenomena (<a href=\"https:\/\/luth.obspm.fr\/?lang=fr\" target=\"_blank\" rel=\"noreferrer noopener\">LUX<\/a>) of Paris Observatory (Laboratoire d\u2019\u00e9tude de l\u2019Univers et des ph\u00e9nom\u00e8nes eXtr\u00eames, Observatoire de Paris). My research focuses on a type of stars called pulsars, which are highly magnetized rotating neutron stars or, more poetically, cosmic lighthouses. I am developing analytical and numerical models in order to enable us to use neutron stars as experimental setups to study extreme physics, from gravitation to ultra-dense matter through quantum electrodynamics. More recently I am also interested in Fast Radio Bursts, extremely bright short signals, proposing models under the assumption that they are produced by neutron stars.<\/p>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-jetpack-layout-grid alignfull column1-desktop-grid__span-8 column1-desktop-grid__row-1 column2-desktop-grid__span-4 column2-desktop-grid__start-9 column2-desktop-grid__row-1 column1-tablet-grid__span-4 column1-tablet-grid__row-1 column2-tablet-grid__span-4 column2-tablet-grid__start-5 column2-tablet-grid__row-1 column1-mobile-grid__span-4 column1-mobile-grid__row-1 column2-mobile-grid__span-4 column2-mobile-grid__row-2\">\n<div class=\"wp-block-jetpack-layout-grid-column wp-block-jetpack-layout-grid__padding-none is-vertically-aligned-center\">\n<h3 class=\"wp-block-heading\" id=\"if-you-don-t-know-what-pulsars-are\">If you don&#8217;t know what pulsars are: <\/h3>\n\n\n\n<p>Neutron stars are the collapsed cores of some massive stars after they explode in supernovae, and are the densest astrophysical objects we know of, weighting ~ 1.4 solar masses for a diameter of only ~25km. Had they collapsed further down, they would have formed a black hole, for which the notion of density is no longer defined. On the other hand, their magnetic field can be 100 billion times stronger than the magnetic field of the Earth. This creates an environment, the magnetosphere, in which utterly exotic phenomena can happen, whereby light is transformed into matter and matter into light. In particular, this results in a beam of light above the magnetic poles which, together with the rotation, makes the star appear to pulsate as the light passes on and off our line of sight. The environment of these stars contains physics that cannot be tested in the Solar system, let alone on Earth. Studying them is therefore a unique window on some of the most fundamental aspects of Nature.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-jetpack-layout-grid-column wp-block-jetpack-layout-grid__padding-none is-vertically-aligned-center\">\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Au coeur de l&#039;Univers - Les Pulsars\" width=\"1440\" height=\"810\" src=\"https:\/\/www.youtube.com\/embed\/9Tukgswynl4?start=1&#038;feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><figcaption class=\"wp-element-caption\">I explained pulsars in <a rel=\"noreferrer noopener\" href=\"https:\/\/www.youtube.com\/watch?time_continue=1&amp;v=9Tukgswynl4\" target=\"_blank\">an outreach video made by <strong>Cyril Plou<\/strong><\/a><strong>.<\/strong><\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-jetpack-layout-grid alignfull column1-desktop-grid__span-12 column1-desktop-grid__row-1 column1-tablet-grid__span-8 column1-tablet-grid__row-1 column1-mobile-grid__span-4 column1-mobile-grid__row-1\">\n<div class=\"wp-block-jetpack-layout-grid-column wp-block-jetpack-layout-grid__padding-none is-vertically-aligned-top\">\n<h3 class=\"wp-block-heading\" id=\"my-work\">My work<\/h3>\n\n\n\n<p>See <a href=\"https:\/\/luth.obspm.fr\/~luthier\/gvoisin\/mywork\/\" data-type=\"page\" data-id=\"60\">the dedicated page<\/a> for a more complete list of my activities. At a glance:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Quantum electrodynamics processes in pulsar magnetospheres: <\/strong>understanding the theory behind light-matter interactions in these extreme environments.<\/li>\n\n\n\n<li><strong>Test of gravity through pulsar timing: <\/strong> studying the motion of a pulsar in orbit with other stars, we obtained with my collaborators one of the most compelling tests of the theory of gravity, general relativity.<\/li>\n\n\n\n<li><strong>Extreme pulsar-companion interaction: <\/strong>studying a type of pulsar nicknamed &#8220;Spiders&#8221;, where the pulsar is literally irradiating, deforming, and evaporating its companion star.<\/li>\n\n\n\n<li><strong>Fast radio bursts: <\/strong>proposing models to explain these fantastic bursts of radio waves. <\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-jetpack-layout-grid alignfull column1-desktop-grid__span-2 column1-desktop-grid__start-6 column1-desktop-grid__row-1 column2-desktop-grid__span-4 column2-desktop-grid__start-8 column2-desktop-grid__row-1 column1-tablet-grid__span-4 column1-tablet-grid__row-1 column2-tablet-grid__span-4 column2-tablet-grid__start-5 column2-tablet-grid__row-1 column1-mobile-grid__span-4 column1-mobile-grid__row-1 column2-mobile-grid__span-4 column2-mobile-grid__row-2\">\n<div class=\"wp-block-jetpack-layout-grid-column wp-block-jetpack-layout-grid__padding-none\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><a href=\"http:\/\/www.cnrs.fr\/\"><img loading=\"lazy\" decoding=\"async\" width=\"100\" height=\"100\" src=\"https:\/\/luth.obspm.fr\/~luthier\/gvoisin\/wp-content\/uploads\/2021\/05\/logo-CNRS-3.png\" alt=\"\" class=\"wp-image-166\" style=\"width:75px;height:75px\"\/><\/a><\/figure>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-jetpack-layout-grid-column wp-block-jetpack-layout-grid__padding-none\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/www.observatoiredeparis.psl.eu\/\"><img loading=\"lazy\" decoding=\"async\" width=\"334\" height=\"73\" src=\"https:\/\/luth.obspm.fr\/~luthier\/gvoisin\/wp-content\/uploads\/2021\/05\/obsparis-PSL-1.png\" alt=\"Observatoire de Paris, Universit\u00e9 de Recherche PSL\" class=\"wp-image-164\" style=\"width:251px;height:55px\" srcset=\"https:\/\/people-lux.obspm.fr\/gvoisin\/wp-content\/uploads\/2021\/05\/obsparis-PSL-1.png 334w, https:\/\/people-lux.obspm.fr\/gvoisin\/wp-content\/uploads\/2021\/05\/obsparis-PSL-1-300x66.png 300w\" sizes=\"auto, (max-width: 334px) 100vw, 334px\" \/><\/a><\/figure>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>What&#8217;s up ? 2025: 2024: September 2023: June 2023: About me I am an astrophysicist working for the CNRS at Laboratory for the study of the Universe and eXtreme phenomena (LUX) of Paris Observatory (Laboratoire d\u2019\u00e9tude de l\u2019Univers et des ph\u00e9nom\u00e8nes eXtr\u00eames, Observatoire de Paris). My research focuses on a type of stars called pulsars,Continue reading &rarr;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-8","page","type-page","status-publish","hentry","no-thumb"],"_links":{"self":[{"href":"https:\/\/people-lux.obspm.fr\/gvoisin\/wp-json\/wp\/v2\/pages\/8","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/people-lux.obspm.fr\/gvoisin\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/people-lux.obspm.fr\/gvoisin\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/people-lux.obspm.fr\/gvoisin\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/people-lux.obspm.fr\/gvoisin\/wp-json\/wp\/v2\/comments?post=8"}],"version-history":[{"count":38,"href":"https:\/\/people-lux.obspm.fr\/gvoisin\/wp-json\/wp\/v2\/pages\/8\/revisions"}],"predecessor-version":[{"id":291,"href":"https:\/\/people-lux.obspm.fr\/gvoisin\/wp-json\/wp\/v2\/pages\/8\/revisions\/291"}],"wp:attachment":[{"href":"https:\/\/people-lux.obspm.fr\/gvoisin\/wp-json\/wp\/v2\/media?parent=8"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}