曲率驱动的加速度和纳什理论中的真空概念

IF 2.8 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

The European Physical Journal Plus Pub Date : 2025-04-24 DOI:10.1140/epjp/s13360-025-06258-4

Soumya Chakrabarti, Soumya Bhattacharya, Rabin Banerjee, Amitabha Lahiri

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引用次数: 0

摘要

我们讨论了纳什引力理论中的宇宙学含义，其中场方程是由里奇不变量中的拉格朗日二次方程导出的。找到了一个空间上齐次的精确解，它可以作为一个宇宙学玩具模型。使用\(JLA + OHD + BAO\)数据集的马尔可夫链蒙特卡罗模拟，将该模型的含义（偏离标准\(\Lambda\) CDM宇宙学）与标准观测期望进行比较。与光度距离模量的测量结果相比，哈勃的演化是令人满意的，减速参数的演化表明在目前的加速之前有一个减速时代。跃迁的红移是相当令人满意的。

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Curvature-driven acceleration and a notion of vacuum in Nash theory

We discuss the cosmological implications in the Nash theory of gravity, where the field equations are derived from a lagrangian quadratic in Ricci invariants. A spatially homogeneous exact solution is found which can serve as a cosmological toy model. The implications of this model (departures from a standard \(\Lambda\)CDM cosmology) are compared with standard observational expectations, using a Markov chain Monte Carlo simulation of \(JLA + OHD + BAO\) datasets. The Hubble evolution is satisfactory compared to the luminosity distance modulus measurements, and the evolution of deceleration parameter suggests an epoch of deceleration prior to the present acceleration. The redshift of transition is found to be quite satisfactory.

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来源期刊

The European Physical Journal Plus PHYSICS, MULTIDISCIPLINARY-

CiteScore

5.40

自引率

8.80%

发文量

1150

审稿时长

4-8 weeks

期刊介绍： The aims of this peer-reviewed online journal are to distribute and archive all relevant material required to document, assess, validate and reconstruct in detail the body of knowledge in the physical and related sciences. The scope of EPJ Plus encompasses a broad landscape of fields and disciplines in the physical and related sciences - such as covered by the topical EPJ journals and with the explicit addition of geophysics, astrophysics, general relativity and cosmology, mathematical and quantum physics, classical and fluid mechanics, accelerator and medical physics, as well as physics techniques applied to any other topics, including energy, environment and cultural heritage.