TL;DR
This paper reviews higher-dimensional gravity theories, comparing three approaches—compactified, projective, and noncompactified—and discusses their cosmological and astrophysical implications without current observational disproof.
Contribution
It provides a comparative analysis of three different higher-dimensional gravity frameworks and their potential observable consequences.
Findings
None of the three approaches can be ruled out observationally.
The paper highlights differences and similarities among the approaches.
Implications for cosmology and astrophysics are discussed.
Abstract
We review higher-dimensional unified theories from the general relativity, rather than the particle physics side. Three distinct approaches to the subject are identified and contrasted: compactified, projective and noncompactified. We discuss the cosmological and astrophysical implications of extra dimensions, and conclude that none of the three approaches can be ruled out on observational grounds at the present time.
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