اینستاگرام تی پی بین
همایش ، رویداد ، ژورنال
حوزه های تحت پوشش رویداد
  • an expanding universe with constant pressure and no cosmological constant

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1015
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
    thanks to its fitting triumph, the λcdm paradigm is assumed to be the most powerful model, for describing the universe dynamics, over much the myriad of cosmological models. unfortunately, the quest of a self-consistent model remains not well explained, because it is not clear how to solve the problems of fine-tuning and coincidence, afflicting the λcdm framework; as a matter of fact, these theoretical drawbacks do not allow to consider the λcdm model, as the final picture of the modern cosmological scenario. here, we show that the simplest model, which provides a constant equation of state for the pressure, leads to a generalization of λcdm, reducing to it in a particular case. moreover, we highlight the physical mechanisms of this model, describing the thermodynamical reasons why a constant pressure should be negative in an expanding universe. in addition, we fit the free parameters of our model by minimizing the chi square through the age differential method, involving a direct measurement of h.

سوال خود را در مورد این مقاله مطرح نمایید :

با انتخاب دکمه ثبت پرسش، موافقت خود را با قوانین انتشار محتوا در وبسایت تی پی بین اعلام می کنم
مقالات جدیدترین رویدادها
مقالات جدیدترین ژورنال ها