{"id":79163,"date":"2024-02-15T10:58:09","date_gmt":"2024-02-15T09:58:09","guid":{"rendered":"https:\/\/aktuelles.uni-frankfurt.de\/?p=79163"},"modified":"2024-04-23T21:43:26","modified_gmt":"2024-04-23T19:43:26","slug":"a-star-like-a-matryoshka-doll-new-theory-for-gravastars","status":"publish","type":"post","link":"https:\/\/aktuelles.uni-frankfurt.de\/en\/english\/a-star-like-a-matryoshka-doll-new-theory-for-gravastars\/","title":{"rendered":"A star like a Matryoshka doll: New theory for gravastars"},"content":{"rendered":"<p><strong>If gravitational condensate stars (or gravastars) actually existed, they would look similar to black holes to a distant observer. Two theoretical physicists at Goethe University Frankfurt have now found a new solution to Albert Einstein&#8217;s theory of general relativity, according to which gravitational stars could be structured like a Russian matryoshka doll, with one gravastar located inside another.<\/strong><\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2024\/02\/bild_Gravasterne-500x500.jpg\" alt=\"\" class=\"wp-image-79161\" srcset=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2024\/02\/bild_Gravasterne-500x500.jpg 500w, https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2024\/02\/bild_Gravasterne-300x300.jpg 300w, https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2024\/02\/bild_Gravasterne-150x150.jpg 150w, https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2024\/02\/bild_Gravasterne-12x12.jpg 12w, https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2024\/02\/bild_Gravasterne.jpg 650w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><figcaption class=\"wp-element-caption\">According to findings by physicists at Goethe University Frankfurt, a gravastar could look like a matryoshka doll. Image: Daniel Jampolski and Luciano Rezzolla, Goethe University Frankfurt<\/figcaption><\/figure>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>The interior of black holes remains a conundrum for science. In 1916, German physicist Karl Schwarzschild outlined a solution to Albert Einstein&#8217;s equations of general relativity, according to which the center of a black hole consists of a so-called singularity, a point at which space and time no longer exist. Here, the theory goes, all physical laws, including Einstein&#8217;s general theory of relativity, no longer apply; the principle of causality is suspended. This constitutes a great nuisance for science: after all, it means that no information can escape from a black hole beyond the so-called event horizon. This could be a reason why Schwarzschild&#8217;s solution did not attract much attention outside the theoretical realm for a long time \u2013 that is, until the first candidate for a black hole was discovered in 1971, followed by the discovery of the black hole in the center of our Milky Way in the 2000s, and finally the first image of a black hole, captured by the Event Horizon Telescope Collaboration in 2019.<\/p>\n\n\n\n<p>In 2001, Pawel Mazur and Emil Mottola proposed a different solution to Einstein&#8217;s field equations that led to objects which they called gravitational condensate stars, or gravastars. Contrary to black holes, gravastars have several advantages from a theoretical astrophysics perspective. On the one hand, they are almost as compact as black holes and also exhibit a gravity at their surface that is essentially as strong as that of a black hole, hence resembling a black hole for all practical purposes. On the other hand, gravastars do not have an event horizon, that is, a boundary from within which no information can be sent out, and their core does not contain a singularity. Instead, the center of gravastars is made up of an exotic \u2013 dark \u2013 energy that exerts a negative pressure to the enormous gravitational force compressing the star. The surface of gravastars is represented by a wafer-thin skin of ordinary matter, the thickness of which approaches zero.<\/p>\n\n\n\n<p>Theoretical physicists Daniel Jampolski and Prof. Luciano Rezzolla of Goethe University Frankfurt have now presented a solution to the field equations of general relativity that describes the existence of a gravastar inside another gravastar. They have given this hypothetical celestial object the name &#8222;nestar&#8220; (from the English \u201cnested\u201d).<\/p>\n\n\n\n<p>Daniel Jampolski, who discovered the solution as part of his Bachelor\u2019s thesis supervised by Luciano Rezzolla, says: \u201cThe nestar is like a matryoshka doll\u201d, adding that, \u201cour solution to the field equations allows for a whole series of nested gravastars.\u201d Whereas Mazur and Mottola posit that the gravastar has a near infinite thin skin consisting of normal matter, the nestar\u2019s matter-composed shell is somewhat thicker: \u201cIt\u2019s a little easier to imagine that something like this could exist.\u201d<\/p>\n\n\n\n<p>Luciano Rezzolla, Professor of Theoretical Astrophysics at Goethe University, explains: \u201cIt\u2019s great that even 100 years after Schwarzschild presented his first solution to Einstein\u2019s field equations from the general theory of relativity, it\u2019s still possible to find new solutions. It\u2019s a bit like finding a gold coin along a path that has been explored by many others before. Unfortunately, we still have no idea how such a gravastar could be created. But even if nestars don&#8217;t exist, exploring the mathematical properties of these solutions ultimately helps us to better understand black holes\u201d.<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"has-background\" style=\"background-color:#eeeeee\"><strong>Publication: <\/strong>Daniel Jampolski, Luciano Rezzolla: <strong>Nested solutions of gravitational condensate stars<\/strong>. Classical Quantum Gravity (2024) <a href=\"https:\/\/doi.org\/10.1088\/1361-6382\/ad2317\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/doi.org\/10.1088\/1361-6382\/ad2317<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>If gravitational condensate stars (or gravastars) actually existed, they would look similar to black holes to a distant observer. Two theoretical physicists at Goethe University Frankfurt have now found a [&hellip;]<\/p>\n","protected":false},"author":23,"featured_media":79160,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"footnotes":""},"categories":[126,254],"tags":[242],"post_folder":[],"class_list":["post-79163","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-english","category-research","tag-physics"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>A star like a Matryoshka doll: New theory for gravastars | Aktuelles aus der Goethe-Universit\u00e4t Frankfurt<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/aktuelles.uni-frankfurt.de\/en\/english\/a-star-like-a-matryoshka-doll-new-theory-for-gravastars\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A star like a Matryoshka doll: New theory for gravastars | Aktuelles aus der Goethe-Universit\u00e4t Frankfurt\" \/>\n<meta property=\"og:description\" content=\"If gravitational condensate stars (or gravastars) actually existed, they would look similar to black holes to a distant observer. 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