نوع مقاله : مقاله پژوهشی

نویسندگان

گروه فیزیک دانشگاه قم، قم

چکیده

در این مقاله خواص فیزیکی قرص‌های برافزایشی نازک را در فضا- زمان ایستا و متقارن کروی کرمچالۀ پلی‌تروپیک چندگانه مطالعه ‏می‌کنیم. با استفاده از مدل نویکو- تورن، شار انرژی تابشی، توزیع دمای سطح قرص، شعاع داخلی‌ترین مدار دایره‌ای پایدار و بازده ‏تابشی قرص را به دست می‌آوریم. نتایج را با کرمچالۀ عبور پذیر موریس- تورن (کرمچالۀ ‏‎(TWH‏ و حل شوارتس‎ ‎شیلد مقایسه می‌کنیم. این مقایسه نشان می‌دهد که قرص‌های نازک در هندسۀ کرمچالۀ پلی‌تروپیک چندگانه نسبت به کرمچالۀ ‏TWH‏ و هندسۀ ‏شوارتس شیلد با همان جرم هندسی، داغ تر، درخشنده‌تر و پربازده‌ترند.

کلیدواژه‌ها

عنوان مقاله [English]

Thin accretion disks around multi-polytropic wormhole

نویسندگان [English]

  • M heydari-Fard
  • F Eghbalpoor

‎‎ ‎ Department of Physics, The University of Qom, Qom, Iran‎‎

چکیده [English]

In this paper, we study the physical properties of thin accretion disks in static and spherically symmetric multi-polytropic wormhole space-time. Using the Novikov-Thorne model, the electromagnetic flux, temperature distribution, innermost stable circular orbits and radiative efficiency of thin disks are obtained. Comparing the results with traversable wormholes obtained by Morris and Thorne (TWH) and the Schwarzschild solution, we show that thin accretion disks around multi-polytropic wormhole geometry are more luminous and more efficient than the TWH and Schwarzschild black hole.

کلیدواژه‌ها [English]

  • accretion disks
  • wormhole
  • black hole physics

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