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

被引：0

作者：

Chakrabarti, Soumya ^{[1
]}

Bhattacharya, Soumya ^{[2
]}

Banerjee, Rabin ^{[2
]}

Lahiri, Amitabha ^{[2
]}

机构：

[1] Vellore Inst Technol, Sch Adv Sci, Tiruvalam Rd,Katpadi, Vellore 632014, Tamil Nadu, India

[2] SN Bose Natl Ctr Basic Sci, Dept Theoret Sci, JD Block,Sect 3, Kolkata 700106, India

来源：

EUROPEAN PHYSICAL JOURNAL PLUS | 2025年 / 140卷 / 04期

关键词：

BARYON ACOUSTIC-OSCILLATIONS; TELESCOPE RESULTS. I; GRAVITY THEORIES; BLACK-HOLE; LIMITATIONS; CONSTRAINTS; DIMENSIONS; HIERARCHY; SHADOW; SPACE;

D O I：

10.1140/epjp/s13360-025-06258-4

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\Lambda$$\end{document}CDM cosmology) are compared with standard observational expectations, using a Markov chain Monte Carlo simulation of JLA+OHD+BAO\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$JLA + OHD + BAO$$\end{document} 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.

引用

页数：9

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