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Geometric Foundations of Gravity
The theory of General Relativity is presented in the framework of general affine geometry. The theory has many equivalent guises, with different geometrical realisations and alternative interpretations for the...
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Article
Open AccessNoether symmetries in symmetric teleparallel cosmology
We consider a general theory of all possible quadratic, first-order derivative terms of the non-metricity tensor in the framework of Symmetric Teleparallel Geometry. We apply the Noether Symmetry Approach to c...
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Article
A note on viability of nonminimally coupled f(R) theory
Consistency conditions for nonminimally coupled f(R) theories have been derived by requiring the absence of tachyons and instabilities in the scalar fluctuations. This note confirms these results and clarifies a ...
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Article
The nature of spacetime in bigravity: Two metrics or none?
The possibility of matter coupling to two metrics at once is considered. This appears natural in the most general ghost-free, bimetric theory of gravity, where it unlocks an additional symmetry with respect to...
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Article
Open AccessCMB statistics in noncommutative inflation
Noncommutative geometry can provide effective description of physics at very short distances taking into account generic effects of quantum gravity. Inflation amplifies tiny quantum fluctuations in the early u...
