منابع مشابه
Infinite Derivative Gravity: A Ghost and Singularity-free Theory
The objective of this thesis is to present a viable extension of general relativity free from cosmological singularities. A viable cosmology, in this sense, is one that is free from ghosts, tachyons or exotic matter, while staying true to the theoretical foundations of General Relativity such as general covariance, as well as observed phenomenon such as the accelerated expansion of the universe...
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We present an example of the quantum system with higher derivatives in the Lagrangian, which is ghost-free: the spectrum of the Hamiltonian is bounded from below and unitarity is preserved.
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Proposing new solution problems of the hierarchy and smallness of the cosmological constant using the Tev scale of the Standard Model in new framework of the higher-order gravity. The theory of higher derivative gravitation, whose action contains terms quadratic in the curvature in addition to the Einstein term, is a renormalizable field theory [1-5,6], but it is not free defect. This theory gi...
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Recent study has shown that a non-singular oscillating potential – a feature of Infinite Derivative Gravity (IDG) theories – matches current experimental data better than the standard GR potential. In this work we show that this non-singular oscillating potential can be given by a wider class of theories which allows the defocusing of null rays, and therefore geodesic completeness. We consolida...
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ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2018
ISSN: 1029-8479
DOI: 10.1007/jhep09(2018)044