کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1840002 1527726 2015 20 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
How universe evolves with cosmological and gravitational constants
ترجمه فارسی عنوان
چگونه جهان با ثابت های کیهانی و گرانشی تکامل یافته است
موضوعات مرتبط
مهندسی و علوم پایه ریاضیات فیزیک ریاضی
چکیده انگلیسی

With a basic varying space–time cutoff ℓ˜, we study a regularized and quantized Einstein–Cartan gravitational field theory and its domains of ultraviolet-unstable fixed point gir≳0gir≳0 and ultraviolet-stable fixed point guv≈4/3guv≈4/3 of the gravitational gauge coupling g=(4/3)G/GNewtong=(4/3)G/GNewton. Because the fundamental operators of quantum gravitational field theory are dimension-2 area operators, the cosmological constant is inversely proportional to the squared correlation length Λ∝ξ−2Λ∝ξ−2. The correlation length ξ characterizes an infrared size of a causally correlate patch of the universe. The cosmological constant Λ and the gravitational constant G   are related by a generalized Bianchi identity. As the basic space–time cutoff ℓ˜ decreases and approaches to the Planck length ℓplℓpl, the universe undergoes inflation in the domain of the ultraviolet-unstable fixed point girgir, then evolves to the low-redshift universe in the domain of ultraviolet-stable fixed point guvguv. We give the quantitative description of the low-redshift universe in the scaling-invariant domain of the ultraviolet-stable fixed point guvguv, and its deviation from the ΛCDM can be examined by low-redshift (z≲1)(z≲1) cosmological observations, such as supernova Type Ia.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Physics B - Volume 897, August 2015, Pages 326–345
نویسندگان
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