{"id":13425,"date":"2025-05-19T02:01:32","date_gmt":"2025-05-19T06:01:32","guid":{"rendered":"https:\/\/spinor.info\/weblog\/?p=13425"},"modified":"2025-05-19T02:01:32","modified_gmt":"2025-05-19T06:01:32","slug":"lensing-again","status":"publish","type":"post","link":"https:\/\/spinor.info\/weblog\/?p=13425","title":{"rendered":"Lensing again"},"content":{"rendered":"<p>I briefly revived a piece of software I wrote last year, modeling the effect of <a href=\"https:\/\/www.vttoth.com\/CMS\/github\/multiple-gravitational-lenses\">multiple gravitational lenses<\/a>. I long wanted to do this, it&#8217;s just a tad time consuming: to use my software for animations, I need to generate images one frame at a time.<\/p>\n<p>What I wanted to do is an animation that shows what an actual galaxy (as opposed to a point source of light) would look like when lensed. The galaxy in question is NGC-4414:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13426\" src=\"https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2025\/05\/ngc4414sm.png\" alt=\"\" width=\"450\" height=\"450\" srcset=\"https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2025\/05\/ngc4414sm.png 450w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2025\/05\/ngc4414sm-300x300.png 300w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2025\/05\/ngc4414sm-150x150.png 150w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2025\/05\/ngc4414sm-96x96.png 96w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2025\/05\/ngc4414sm-24x24.png 24w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2025\/05\/ngc4414sm-36x36.png 36w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2025\/05\/ngc4414sm-48x48.png 48w, https:\/\/spinor.info\/weblog\/wp-content\/uploads\/2025\/05\/ngc4414sm-64x64.png 64w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><\/p>\n<p>Nice spiral, isn&#8217;t it. Well, here&#8217;s what we&#8217;d see if we viewed it through an imperfect alignment of four gravitational lenses:<\/p>\n<div style=\"text-align: center;\"><video loop=\"loop\" controls=\"controls\" width=\"450\" height=\"450\"><span data-mce-type=\"bookmark\" style=\"display: inline-block; width: 0px; overflow: hidden; line-height: 0;\" class=\"mce_SELRES_start\">\ufeff<\/span><source src=\"\/weblog\/wp-content\/uploads\/2025\/05\/outputq.mp4\" type=\"video\/mp4\" \/><\/video><\/div>\n<p>I could watch this animation for hours.<\/p>\n<fb:like href='https:\/\/spinor.info\/weblog\/?p=13425' send='true' layout='standard' show_faces='true' width='450' height='65' action='like' colorscheme='light' font='lucida grande'><\/fb:like>","protected":false},"excerpt":{"rendered":"<p>I briefly revived a piece of software I wrote last year, modeling the effect of multiple gravitational lenses. I long wanted to do this, it&#8217;s just a tad time consuming: to use my software for animations, I need to generate images one frame at a time. What I wanted to do is an animation that <a href='https:\/\/spinor.info\/weblog\/?p=13425' class='excerpt-more'>[&#8230;]<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-13425","post","type-post","status-publish","format-standard","hentry","category-physics","category-3-id","post-seq-1","post-parity-odd","meta-position-corners","fix"],"_links":{"self":[{"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=\/wp\/v2\/posts\/13425","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=13425"}],"version-history":[{"count":6,"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=\/wp\/v2\/posts\/13425\/revisions"}],"predecessor-version":[{"id":13433,"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=\/wp\/v2\/posts\/13425\/revisions\/13433"}],"wp:attachment":[{"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=13425"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=13425"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/spinor.info\/weblog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=13425"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}