https://phys.org/news/2024-02-star-matryoshka-doll-theory-gravastars.html Phys.org Topics * Week's top * Latest news * Unread news * Subscribe [ ] Science X Account [ ] [ ] [*] Remember me Sign In Click here to sign in with or Forget Password? Not a member? Sign up Learn more * Nanotechnology * Physics * Earth * Astronomy & Space * Chemistry * Biology * Other Sciences * Medical Xpress Medicine * Tech Xplore Technology [INS::INS] * * share this! * 110 * Twit * Share * Email 1. Home 2. Physics 3. General Physics * * * --------------------------------------------------------------------- February 15, 2024 Editors' notes This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: fact-checked trusted source proofread A star like a Matryoshka doll: New theory for gravastars by Markus Bernards, Goethe University Frankfurt am Main A star like a Matryoshka doll: New theory for gravastars According to findings by physicists at Goethe University Frankfurt, a gravastar could look like a matryoshka doll. Credit: Daniel Jampolski and Luciano Rezzolla The interior of black holes remains a conundrum for science. In 1916, German physicist Karl Schwarzschild outlined a solution to Albert Einstein's equations of general relativity, in 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'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's solution did not attract much attention outside the theoretical realm--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. In 2001, Pawel Mazur and Emil Mottola proposed a different solution to Einstein's field equations that led to objects that 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 a gravastar is made up of an exotic (dark) energy that exerts a negative pressure to the enormous gravitational force compressing the star. The surface of a gravastar is represented by a wafer-thin skin of ordinary matter, the thickness of which approaches zero. [INS::INS] 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 "nestar" (from the English "nested"). The study is published in Classical and Quantum Gravity. Daniel Jampolski, who discovered the solution as part of his Bachelor's thesis supervised by Luciano Rezzolla, says, "The nestar is like a matryoshka doll. Our solution to the field equations allows for a whole series of nested gravastars." Whereas Mazur and Mottola posit that the gravastar has a near infinite thin skin consisting of normal matter, the nestar's matter-composed shell is somewhat thicker: "It's a little easier to imagine that something like this could exist." Luciano Rezzolla, Professor of Theoretical Astrophysics at Goethe University, explains, "It's great that even 100 years after Schwarzschild presented his first solution to Einstein's field equations from the general theory of relativity, it's still possible to find new solutions. It's 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't exist, exploring the mathematical properties of these solutions ultimately helps us to better understand black holes." More information: Daniel Jampolski et al, Nested solutions of gravitational condensate stars, Classical and Quantum Gravity (2024). DOI: 10.1088/1361-6382/ad2317 Provided by Goethe University Frankfurt am Main Citation: A star like a Matryoshka doll: New theory for gravastars (2024, February 15) retrieved 17 February 2024 from https://phys.org/ news/2024-02-star-matryoshka-doll-theory-gravastars.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. --------------------------------------------------------------------- Explore further Not all theories can explain the black hole M87* --------------------------------------------------------------------- 110 shares * Facebook * Twitter * Email Feedback to editors * Featured * Last Comments * Popular Saturday Citations: Einstein revisited (again); Atlantic geological predictions; how the brain handles echoes 8 hours ago 1 Diamond quantum memory with Germanium vacancy exceeds coherence time of 20 ms Feb 16, 2024 0 Flea toad may be world's smallest vertebrate Feb 16, 2024 0 Astronomers investigate the atmosphere of a nearby cold brown dwarf Feb 15, 2024 0 Application of ultrasound found to greatly speed up motility of human sperm Feb 15, 2024 1 --------------------------------------------------------------------- [gif] Examining viruses that can help 'dial up' carbon capture in the sea 1 hour ago [gif] New research helps create new antibiotic that evades bacterial resistance 3 hours ago [gif] From crop to cup: A new genetic map could make your morning coffee more climate resilient 5 hours ago [gif] Saturday Citations: Einstein revisited (again); Atlantic geological predictions; how the brain handles echoes 8 hours ago [gif] CERN researchers measure speed of sound in the quark-gluon plasma more precisely than ever before Feb 16, 2024 [gif] NASA's final tally shows spacecraft returned double the amount of asteroid rubble Feb 16, 2024 [gif] Harnessing light with hemispherical shells for improved photovoltaics Feb 16, 2024 [gif] New species of pirate spiders discovered on South Atlantic island Feb 16, 2024 [gif] Bacteria in the Arctic seabed are active all year round, researchers find Feb 16, 2024 [gif] Martians wanted: Apply here now for NASA's simulated yearlong Mars mission Feb 16, 2024 --------------------------------------------------------------------- Relevant PhysicsForums posts Single-Slit Diffraction -- Deriving the relation for the minima Feb 13, 2024 What is currently known about fields other than gravitaion? Feb 13, 2024 Is "scalar wave" a legitimate term? Feb 13, 2024 Speed of light and Euler's constant Feb 12, 2024 Can someone explain this statement on luminous transmittance? Feb 12, 2024 Lunar explosion physics Feb 12, 2024 More from Other Physics Topics --------------------------------------------------------------------- [INS::INS] * Related Stories [gif] Not all theories can explain the black hole M87* May 20, 2021 [gif] It's a fine line between a black hole energy factory and a black hole bomb Jan 30, 2024 [gif] The holographic secret of black holes Dec 19, 2023 [gif] Could this copycat black hole be a new type of star? Apr 18, 2023 [gif] Researchers suggest paired black holes pulled by cosmic expansion could seem to be one entity Oct 5, 2023 [gif] Jet from giant galaxy M87: Computer modelling explains black hole observations Nov 4, 2021 * Recommended for you [gif] CERN researchers measure speed of sound in the quark-gluon plasma more precisely than ever before Feb 16, 2024 [gif] Measuring neutrons to reduce nuclear waste: New technique paves the way for improved nuclear waste treatment facilities Feb 16, 2024 [gif] Study finds quantum state of a rotating superfluid can discharge in three ways Feb 16, 2024 [gif] Scientists report first look at electrons moving in real-time in liquid water Feb 15, 2024 [gif] New nuclei can help shape our understanding of fundamental science on Earth and in the cosmos Feb 15, 2024 [gif] Unlocking the full potential of Auger electron spectroscopy Feb 15, 2024 Load comments (1) Let us know if there is a problem with our content Use this form if you have come across a typo, inaccuracy or would like to send an edit request for the content on this page. For general inquiries, please use our contact form. For general feedback, use the public comments section below (please adhere to guidelines). Please select the most appropriate category to facilitate processing of your request [-- please select one -- ] [ ] [ ] [ ] [ ] [ ] Your message to the editors [ ] Your email (only if you want to be contacted back) [ ] Send Feedback Thank you for taking time to provide your feedback to the editors. Your feedback is important to us. However, we do not guarantee individual replies due to the high volume of messages. E-mail the story A star like a Matryoshka doll: New theory for gravastars Your friend's email [ ] Your email [ ] [ ] I would like to subscribe to Science X Newsletter. Learn more Your name [ ] Note Your email address is used only to let the recipient know who sent the email. Neither your address nor the recipient's address will be used for any other purpose. The information you enter will appear in your e-mail message and is not retained by Phys.org in any form. [ ] [ ] [ ] [ ] [ ] [ ] [ ] Your message [ ] Send Newsletter sign up Get weekly and/or daily updates delivered to your inbox. You can unsubscribe at any time and we'll never share your details to third parties. [ ] Subscribe More information Privacy policy Donate and enjoy an ad-free experience We keep our content available to everyone. Consider supporting Science X's mission by getting a premium account. Remove ads Maybe later Medical Xpress Medical Xpress Medical research advances and health news Tech Xplore Tech Xplore The latest engineering, electronics and technology advances Science X Science X The most comprehensive sci-tech news coverage on the web Newsletters [ ] Subscribe Science X Daily and the Weekly Email Newsletter are free features that allow you to receive your favorite sci-tech news updates in your email inbox Follow us * * * * * Top * Home * Search * Mobile version * Help * FAQ * About * Contact * Science X Account * Premium Account * Archive * News wire * Android app * iOS app * RSS feeds * Push notification (c) Phys.org 2003 - 2024 powered by Science X Network Privacy policy Terms of use E-mail newsletter [ ] Subscribe Follow us * * * * It appears that you are currently using Ad Blocking software. What are the consequences? x Quantcast