Modified Teleparallel Gravity induced by quantum fluctuations

Chen, Che-Yu; Kung, Yu-Hsien

doi:10.1016/j.dark.2022.100956

Cited by 8 publications

(12 citation statements)

References 38 publications

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“…After that, we will review the result of ref. [30], in which the authors proposed an effective theory in the teleparallel formulation to describe how quantum corrections may manifest in the classical gravitational theory, in the semi-classical regimes. We will use this effective model as our main consideration to implement the cosmological tests later.…”

Section: Teleparallel Gravity As Generated From Quantum Fluctuationsmentioning

confidence: 99%

“…The quantum effects in the resulting effective theories generically give rise to non-minimal couplings between matter and geometry. Very recently, this approach was applied to the teleparallel formulation [30] and the resulting effective theories are generically featured by non-minimal torsion-matter couplings.…”

Section: Jcap04(2022)052mentioning

confidence: 99%

“…[28,29] and, more recently, in ref. [30] where it was shown that semi-classically, such quantum fluctuations generally appear as modified gravity terms in the gravitational field equations. The key idea implemented in these papers is to decompose the fundamental gravitational field into a classical part and a quantum fluctuating part, may it be the metric in a curvature-based formulation or the tetrad in a teleparallel formulation.…”

Section: Introductionmentioning

confidence: 99%

“…This belongs to a class of general f (T, B, T ) gravity and was singled out in ref. [30] as novel due to the absence of an equivalent Riemannian formulation. We seek to constrain the modified gravity corrections and non-minimal matter couplings in this theory using cosmological observations.…”

Section: Introductionmentioning

confidence: 99%

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Confronting quantum-corrected teleparallel cosmology with observations

Bernardo

Chen

Said

et al. 2022

J. Cosmol. Astropart. Phys.

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It has been shown that at the semi-classical order, gravitational theories with quantum fluctuations can be effectively recast as modified theories of gravity with non-minimal gravity-matter couplings. We proceed from an observational perspective and see whether such quantum fluctuations can leave imprints on the late Universe. Within the teleparallel formulation, we investigate a representative model in this general class of modified gravitational theories inlaid with quantum fluctuations, and determine the cosmological parameters by using compiled late-time data sets. Furthermore, we assess the statistical significance of such quantum corrections compared to the standard cosmological model. The results mildly favor the inclusion of quantum corrections with a negative density parameter supporting a phantom-like dark energy. This edge is not sufficient to rule out either models but it supports the consideration of quantum corrections in a cosmological setting.

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Section: Teleparallel Gravity As Generated From Quantum Fluctuationsmentioning

confidence: 99%

Section: Jcap04(2022)052mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Confronting quantum-corrected teleparallel cosmology with observations

Bernardo

Chen

Said

et al. 2022

J. Cosmol. Astropart. Phys.

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“…These particle creation processes commonly appear when considering quantum field theory in curved spacetimes. In fact, the presence of non-minimal matter-gravity couplings can be regarded as one potential consequence when considering the semiclassical levels in quantizing gravity [10,11,12,13,14,15].…”

Section: Introductionmentioning

confidence: 99%

Slow-roll inflation in $f(R,T)$ gravity with a $RT$ mixing term

Chen¹,

Reyimuaji²,

Zhang³

2022

Preprint

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We consider slow-roll inflationary models in a class of modified theories of gravity which contains non-minimal curvature-inflaton couplings, i.e., the f (R, T ) gravity, where R is the Ricci scalar and T is the trace of the inflaton energy-momentum tensor. On top of the minimally coupled T that has been widely investigated in the literature, we further include a RT mixing term in the theory. This mixing term introduces non-minimal derivative couplings and plays an important role in inflationary dynamics. Taking chaotic and natural inflation as examples, we find that the predictions for spectral tilt and the tensor-to-scalar ratio are sensitive to the existence of the RT mixing term. In particular, by turning on this mixing term, it is possible to bring chaotic and natural inflation into better agreement with observational data.

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