کرمچاله های کیهانی در یک فضا زمان متقارن کروی ناهمگن

نوع مقاله : مقاله پژوهشی کامل

نویسندگان

دانشکده فیزیک دانشگاه شهید باهنر کرمان، کرمان، ایران

چکیده

در این مقاله ما دسته ای از جواب‌های کرمچاله‌ای دینامیکی در یک فضا زمان غیر همگن متقارن کروی را با در نظر گرفتن تابع سرخ گرایی وابسته به شعاع مطالعه نموده ایم. با تعمیم متریک فریدمان – روبرتسون – واکر جواب های دینامیکی کرمچاله ای با استفاده از یک معادله حالت خاص بین چگالی انرژی و مولفه های فشار محاسبه شده اند. ما این دسته از جواب ها را با انتخاب ثابت جدا سازی صفر تعیین و عامل مقیاس آنها را محاسبه نموده ایم. آهنگ انبساط دینامیکی کرمچاله ها با استفاده از معادله استاندارد فریدمان در کیهان شناسی تعیین می شوند. ما به معرفی کرمچاله هایی گذر پذیر با ارضاء شرایط انرژی در گلوگاه پرداخته ایم. در پایان شرایط انرژی ضعیف برای این دسته از جواب‌های کرمچاله‌ای بررسی شده اند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Cosmological wormholes in an Inhomogeneous Spherically Symmetric Space Time

نویسندگان [English]

  • mohammad reza mehdizadeh
  • jaber poorsolimani
Department of Physics, Shahid bahonar University of Kerman, Kerman. Iran
چکیده [English]

In this paper, we study a family of dynamical wormhole solutions in an inhomogeneous spherically symmetric space time by considering a specific radial dependent redshift function . Using a generalized Friedmann-Robertson-Walker spacetime, we derive analytical evolving wormhole geometries by assuming a particular equation of state for energy density and pressure profiles. We calculate these classes of solutions
for zero separation constant and their scale factor. The rate of expansion of these evolving wormholes is determined only by the standard Friedmann equation in cosmology . We introduce exact asymptotically flat solutions that respect energy conditions at throat. Finally, we investigate the weak energy condition for these solutions with detail

کلیدواژه‌ها [English]

  • wormhole
  • weak energy condition
  • cosmology
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