Modified Gravity and Dark Energy Theories

A special issue of Universe (ISSN 2218-1997). This special issue belongs to the section "Gravitation".

Deadline for manuscript submissions: 30 November 2025 | Viewed by 1296

Special Issue Editor


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Guest Editor
The National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
Interests: general relativity; exact solutions of Einstein equations; dark energy theories; gravity theories beyond general relativity; black; hole solutions

Special Issue Information

Dear Colleagues,

In the past two decades, tremendous experimental and theoretical progress has been made, deepening our understanding of cosmic acceleration, but not solving its riddle. In cosmology, a widely used classification among physical models for acceleration distinguishes between dark energy and modified gravity. In this Special Issue, we will publish a thoroughly comprehensive survey of recent works on dark energy studies and modified theories of gravity and their astrophysical, gravitational, and cosmological consequence, as well as their phenomenology and characteristic observable signatures. The papers will cover dark energy models, all kinds of modified gravities, cosmic observational, gravitational, or theoretical constraints, black hole and stellar solutions in modified gravities, and so on.

Dr. Changjun Gao
Guest Editor

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Keywords

  • dark energy
  • modified gravity theories
  • black hole solutions
  • exact solutions
  • black hole thermodynamics
  • nature of spacetime
  • black hole physics
  • gravitational waves in modified gravity theories

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Published Papers (2 papers)

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Research

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10 pages, 230 KiB  
Article
A Small Cosmological Constant from a Large Number of Extra Dimensions
by Changjun Gao
Universe 2025, 11(2), 46; https://doi.org/10.3390/universe11020046 - 1 Feb 2025
Viewed by 660
Abstract
In this article, we consider the 4 + n dimensional spacetimes among which one is the four dimensional physical Universe and the other is an n-dimensional sphere with constant radius in the framework of Lanczos-Lovelock gravity. We find that the curvature of extra [...] Read more.
In this article, we consider the 4 + n dimensional spacetimes among which one is the four dimensional physical Universe and the other is an n-dimensional sphere with constant radius in the framework of Lanczos-Lovelock gravity. We find that the curvature of extra dimensional sphere contributes a huge but negative energy density provided that its radius is sufficiently small, such as the scale of Planck length. Therefore, the huge positive vacuum energy, i.e., the large positive cosmological constant is exactly cancelled out by the curvature of extra sphere. In the mean time the higher order of Lanczos-Lovelock term contributes an observations-allowed small cosmological constant if the number of extra dimensions is sufficiently large, such as n ≈ 69. Full article
(This article belongs to the Special Issue Modified Gravity and Dark Energy Theories)

Review

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43 pages, 520 KiB  
Review
Polynomial Affine Model of Gravity: After 10 Years
by Oscar Castillo-Felisola, Bastian Grez, Manuel Morocho-López, Jose Perdiguero, Aureliano Skirzewski, Jefferson Vaca-Santana and Nicolas Zambra-Gómez
Universe 2025, 11(3), 102; https://doi.org/10.3390/universe11030102 - 18 Mar 2025
Cited by 1 | Viewed by 273
Abstract
The polynomial affine model of gravity was proposed as an alternative to metric and metric-affine gravitational models. What, in the beginning, was thought to be a source of unpredictability—the presence of many terms in the action—turned out to be a milestone since it [...] Read more.
The polynomial affine model of gravity was proposed as an alternative to metric and metric-affine gravitational models. What, in the beginning, was thought to be a source of unpredictability—the presence of many terms in the action—turned out to be a milestone since it contains all possible combinations of the fields compatible with the covariance under diffeomorphisms. Here, we present a review of the advances in the analysis of the model after 10 years of its proposal and sketch the guidelines for our future perspectives. Full article
(This article belongs to the Special Issue Modified Gravity and Dark Energy Theories)
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