{"id":27961,"date":"2024-03-04T10:12:22","date_gmt":"2024-03-04T11:12:22","guid":{"rendered":"https:\/\/express24.ir\/d\/product\/%d9%85%d9%82%d8%a7%d9%84%d9%87-%da%86%d8%a7%d9%84%d8%b4%d9%87%d8%a7%db%8c-%d8%b9%d8%af%d8%af%db%8c-%d8%a8%d8%b1%d8%a7%db%8c-%d8%ad%d9%81%d8%b8-%d8%a7%d9%86%d8%b1%da%98%db%8c-%d8%af%d8%b1\/"},"modified":"2024-03-04T10:12:23","modified_gmt":"2024-03-04T11:12:23","slug":"%d9%85%d9%82%d8%a7%d9%84%d9%87-%da%86%d8%a7%d9%84%d8%b4%d9%87%d8%a7%db%8c-%d8%b9%d8%af%d8%af%db%8c-%d8%a8%d8%b1%d8%a7%db%8c-%d8%ad%d9%81%d8%b8-%d8%a7%d9%86%d8%b1%da%98%db%8c-%d8%af%d8%b1","status":"publish","type":"product","link":"https:\/\/express24.ir\/d\/product\/%d9%85%d9%82%d8%a7%d9%84%d9%87-%da%86%d8%a7%d9%84%d8%b4%d9%87%d8%a7%db%8c-%d8%b9%d8%af%d8%af%db%8c-%d8%a8%d8%b1%d8%a7%db%8c-%d8%ad%d9%81%d8%b8-%d8%a7%d9%86%d8%b1%da%98%db%8c-%d8%af%d8%b1\/","title":{"rendered":"\u0645\u0642\u0627\u0644\u0647 \u0686\u0627\u0644\u0634\u200c\u0647\u0627\u06cc \u0639\u062f\u062f\u06cc \u0628\u0631\u0627\u06cc \u062d\u0641\u0638 \u0627\u0646\u0631\u0698\u06cc \u062f\u0631 \u0634\u0628\u06cc\u0647\u200c\u0633\u0627\u0632\u06cc\u200c\u0647\u0627\u06cc N-\u062c\u0633\u0645 \u0647\u0627\u0644\u0647\u200c\u0647\u0627\u06cc \u0645\u0627\u062f\u0647 \u062a\u0627\u0631\u06cc\u06a9 \u062f\u0631 \u062d\u0627\u0644 \u0641\u0631\u0648\u067e\u0627\u0634\u06cc \u062e\u0648\u062f \u062a\u0639\u0627\u0645\u0644\u06cc"},"content":{"rendered":"\n\n\n\n\n\n\n\n\n\n\n
\u0639\u0646\u0648\u0627\u0646 \u0645\u0642\u0627\u0644\u0647 \u0628\u0647 \u0627\u0646\u06af\u0644\u06cc\u0633\u06cc <\/td>\nNumerical challenges for energy conservation in N-body simulations of collapsing self-interacting dark matter haloes<\/td>\n<\/tr>\n
\u0639\u0646\u0648\u0627\u0646 \u0645\u0642\u0627\u0644\u0647 \u0628\u0647 \u0641\u0627\u0631\u0633\u06cc <\/td>\n\u0645\u0642\u0627\u0644\u0647 \u0686\u0627\u0644\u0634 \u0647\u0627\u06cc \u0639\u062f\u062f\u06cc \u0628\u0631\u0627\u06cc \u062d\u0641\u0627\u0638\u062a \u0627\u0632 \u0627\u0646\u0631\u0698\u06cc \u062f\u0631 \u0634\u0628\u06cc\u0647 \u0633\u0627\u0632\u06cc N-\u0628\u062f\u0646 \u0627\u0632 \u0641\u0631\u0648\u067e\u0627\u0634\u06cc \u0647\u0627\u0644\u0647 \u0647\u0627\u06cc \u0645\u0627\u062f\u0647 \u062a\u0627\u0631\u06cc\u06a9 \u062e\u0648\u062f \u062f\u0631 \u062d\u0627\u0644 \u0641\u0631\u0648\u067e\u0627\u0634\u06cc<\/td>\n<\/tr>\n
\u0646\u0648\u06cc\u0633\u0646\u062f\u06af\u0627\u0646 <\/td>\nMoritz S. Fischer, Klaus Dolag, Hai-Bo Yu<\/td>\n<\/tr>\n
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\u0641\u0631\u0645\u062a \u0645\u0642\u0627\u0644\u0647: <\/td>\nPDF<\/td>\n<\/tr>\n
\u062a\u0639\u062f\u0627\u062f \u0635\u0641\u062d\u0627\u062a<\/td>\n10<\/td>\n<\/tr>\n
\u062f\u0633\u062a\u0647 \u0628\u0646\u062f\u06cc \u0645\u0648\u0636\u0648\u0639\u0627\u062a <\/td>\nCosmology and Nongalactic Astrophysics,Astrophysics of Galaxies,High Energy Physics – Phenomenology,\u06a9\u06cc\u0647\u0627\u0646 \u0634\u0646\u0627\u0633\u06cc \u0648 \u0627\u062e\u062a\u0631\u0641\u06cc\u0632\u06cc\u06a9 \u0646\u0648\u0646\u06af\u0627\u0644\u0627\u06cc\u06a9 , \u0627\u062e\u062a\u0631\u0641\u06cc\u0632\u06cc\u06a9 \u06a9\u0647\u06a9\u0634\u0627\u0646 \u0647\u0627 , \u0641\u06cc\u0632\u06cc\u06a9 \u0627\u0646\u0631\u0698\u06cc \u0628\u0627\u0644\u0627 – \u067e\u062f\u06cc\u062f\u0627\u0631\u0634\u0646\u0627\u0633\u06cc ,<\/td>\n<\/tr>\n
\u062a\u0648\u0636\u06cc\u062d\u0627\u062a <\/td>\nSubmitted 1 March, 2024; originally announced March 2024. , Comments: 10 pages, 6 figures<\/td>\n<\/tr>\n
\u062a\u0648\u0636\u06cc\u062d\u0627\u062a \u0628\u0647 \u0641\u0627\u0631\u0633\u06cc <\/td>\n\u0627\u0631\u0633\u0627\u0644 1 \u0645\u0627\u0631\u0633 2024 \u061b\u062f\u0631 \u0627\u0628\u062a\u062f\u0627 \u0645\u0627\u0631\u0633 2024 \u0627\u0639\u0644\u0627\u0645 \u0634\u062f \u060c \u0646\u0638\u0631\u0627\u062a: 10 \u0635\u0641\u062d\u0647 \u060c 6 \u0634\u06a9\u0644<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u0686\u06a9\u06cc\u062f\u0647<\/h2>\n

Dark matter (DM) haloes can be subject to gravothermal collapse if DM is not collisionless but has strong self-interactions. When the scattering can efficiently transfer heat from the centre to the outskirts, the central region of the halo collapses and reaches densities much higher than those for collisionless DM. This phenomenon is potentially observable in studies of strong lensing. Current theoretical efforts are motivated by observations of surprisingly dense substructures. A comparison with them requires accurate predictions. One method to obtain such predictions is to use N-body simulations. The collapsed haloes are extreme systems that pose severe challenges to state-of-the-art codes used to model self-interacting dark matter (SIDM). We investigate the root of such problems with a focus on energy non-conservation. We run N-body simulations with and without DM self-interactions of an isolated DM-only halo and change numerical parameters relevant to the accuracy of the simulation. We find that not only the numerical scheme for the DM self-interactions can lead to energy non-conservation but also the modelling of gravitational interaction and the time integration are problematic. The issues we found are: (a) particles changing their time step in a non-time-reversible manner; (b) the asymmetry in the tree-based gravitational force evaluation; (c) SIDM velocity kicks break the symplectic nature and time symmetry. Tuning the parameters of the simulation to achieve a high accuracy allows for conserving energy not only at early stages of the evolution but also at late ones. However, the cost of the simulations becomes prohibitively large. Some problems making the simulations of the gravothermal collapse phase inaccurate, can be overcome by choosing appropriate numerical schemes. However, others remain challenging. Our findings motivate further work on addressing these challenges.<\/p>\n

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  • \r\n\t\t\u0642\u06cc\u0645\u062a \u0647\u0631 \u0635\u0641\u062d\u0647 \u062a\u0631\u062c\u0645\u0647 \u062f\u0631 \u062d\u0627\u0644 \u062d\u0627\u0636\u0631 40 \u0647\u0632\u0627\u0631 \u062a\u0648\u0645\u0627\u0646 \u0645\u06cc \u0628\u0627\u0634\u062f. \r\n\t\t<\/li>\r\n\t\t
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  • \r\n\t\t\u06a9\u06cc\u0641\u06cc\u062a \u062a\u0631\u062c\u0645\u0647 \u0628\u0633\u06cc\u0627\u0631 \u0628\u0627\u0644\u0627 \u0645\u06cc \u0628\u0627\u0634\u062f. \u0645\u0642\u0627\u0644\u0647 \u0641\u0642\u0637 \u062a\u0648\u0633\u0637 \u0645\u062a\u0631\u062c\u0645\u06cc\u0646 \u0628\u0627 \u0645\u062f\u0631\u06a9 \u062f\u0627\u0646\u0634\u06af\u0627\u0647\u06cc \u0645\u062a\u0631\u062c\u0645\u06cc \u062a\u0631\u062c\u0645\u0647 \u0645\u06cc\u200c\u0634\u0648\u062f.\r\n\t\t<\/li>\r\n\t\t
  • \r\n\t\t\u06a9\u0644\u06cc\u0647 \u062c\u062f\u0627\u0648\u0644 \u0648 \u0641\u0631\u0645\u0648\u0644 \u0647\u0627 \u0646\u06cc\u0632 \u062f\u0631 \u0641\u0627\u06cc\u0644 \u062a\u062d\u0648\u06cc\u0644\u06cc \u0648\u0631\u062f \u062f\u0631\u062c \u0645\u06cc\u200c\u0634\u0648\u0646\u062f.\r\n\t\t<\/li>\r\n\t<\/td>\r\n\t\r\n\t\r\n<\/tr>\r\n<\/table>\r\n\r\n\r\n\n","protected":false},"excerpt":{"rendered":"

    \u0639\u0646\u0648\u0627\u0646 \u0645\u0642\u0627\u0644\u0647 \u0628\u0647 \u0627\u0646\u06af\u0644\u06cc\u0633\u06cc Numerical challenges for energy conservation in N-body simulations of collapsing self-interacting dark matter haloes \u0639\u0646\u0648\u0627\u0646 \u0645\u0642\u0627\u0644\u0647 […]<\/p>\n","protected":false},"featured_media":27,"comment_status":"open","ping_status":"closed","template":"","meta":{"pmpro_default_level":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}}},"product_cat":[15,21],"product_tag":[314,315,319,316,320,669],"class_list":{"0":"post-27961","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-15","7":"product_cat-21","8":"product_tag-astrophysics-of-galaxies","9":"product_tag-cosmology-and-nongalactic-astrophysics","10":"product_tag-high-energy-physics-phenomenology","11":"product_tag-316","12":"product_tag-320","13":"product_tag-669","14":"pmpro-has-access","15":"desktop-align-left","16":"tablet-align-left","17":"mobile-align-left","19":"first","20":"instock","21":"shipping-taxable","22":"purchasable","23":"product-type-variable"},"yoast_head":"\n\u0645\u0642\u0627\u0644\u0647 \u0686\u0627\u0644\u0634\u200c\u0647\u0627\u06cc \u0639\u062f\u062f\u06cc \u0628\u0631\u0627\u06cc \u062d\u0641\u0638 \u0627\u0646\u0631\u0698\u06cc \u062f\u0631 \u0634\u0628\u06cc\u0647\u200c\u0633\u0627\u0632\u06cc\u200c\u0647\u0627\u06cc N-\u062c\u0633\u0645 \u0647\u0627\u0644\u0647\u200c\u0647\u0627\u06cc \u0645\u0627\u062f\u0647 \u062a\u0627\u0631\u06cc\u06a9 \u062f\u0631 \u062d\u0627\u0644 \u0641\u0631\u0648\u067e\u0627\u0634\u06cc \u062e\u0648\u062f \u062a\u0639\u0627\u0645\u0644\u06cc - 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