Cosmological quantum entanglement: a possible testbed for the existence of Kalb–Ramond field

Paul, Tanmoy; Banerjee, Narayan

doi:10.1088/1361-6382/ab8bb9

Cited by 7 publications

(6 citation statements)

References 54 publications

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“…At this point we should also mention the so-called teleparallel theories of gravity [86][87][88][89][90], which, in contrast to the aforementioned contorted theories of gravity, in which both the metric and the torsion fields 4 For another model with dynamical, "running", dark energy, where the space-time is associated with a dynamical field (dynamical space time), and its phenomenological consequences, see [60,61]. 5 At this point we mention that there are several interesting works in the literature dealing with the rôle of string-inspired KR fields in cosmology, for instance, in the context of modified gravity models we refer the reader to the works in [69][70][71][72] for further details and comparison with our results reported in this review. For brane-world models, see, eg.…”

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confidence: 99%

Torsion in string-inspired cosmologies and the universe dark sector

Mavromatos

2021

Preprint

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I review several aspects of torsion in string-inspired cosmologies. In particular, I discuss its connection with fundamental, string-model independent, axion fields associated with the massless gravitational multiplet of the string. I argue in favour of the role of primordial gravitational anomalies coupled to such axions in inducing inflation of a type encountered in the "running-vacuum-model (RVM) " cosmological framework, without fundamental inflaton fields. The gravitational-anomaly terms owe their existence to the Green-Schwarz mechanism for the (extra-dimensional) anomaly cancellation, and may be non-trivial in such theories in the presence of (primordial) gravitational waves at early stages of the four-dimensional string Universe (after compactification). I also discuss how the torsion-induced stringy axions can acquire a mass in the post inflationary era, due to non perturbative effects, thus having the potential to play the rôle of (a component of) dark matter in such models. Finally, I describe briefly the current-era phenomenology of this model, with the emphasis placed on the possibility of alleviating tensions observed in the current-era cosmological data. A brief phenomenological comparison with other cosmological models in contorted geometries is also made.

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confidence: 99%

Torsion in string-inspired cosmologies and the universe dark sector

Mavromatos

2021

Preprint

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“…In fact, in effective four-dimensional gravitational field theory, which is obtained after compactification of the extra-dimensional string theory, this torsion is equivalent in the full quantum theory to a dynamical massless pseudoscalar field (KR axion), which is identified with the so-called string-model independent axion [67,68]. The presence of the pseudoscalar leads also to axion secondary hair in the (spinning) black holes of the theory [67] (at this point we mention that there are several interesting works in the literature dealing with the role of string-inspired KR fields in cosmology, for instance, in the context of modified gravity models we refer the reader to the works in [69][70][71][72] for further details and comparison with the results reported in this review. For brane-world models, see, e.g., Ref.…”

Section: Introduction: a Case For Going Beyond Gr And Riemannian Geometrymentioning

confidence: 99%

Torsion in String-Inspired Cosmologies and the Universe Dark Sector

Mavromatos

2021

Universe

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Several aspects of torsion in string-inspired cosmologies are reviewed. In particular, its connection with fundamental, string-model independent, axion fields associated with the massless gravitational multiplet of the string are discussed. It is argued in favour of the role of primordial gravitational anomalies coupled to such axions in inducing inflation of a type encountered in the “Running-Vacuum-Model (RVM)” cosmological framework, without fundamental inflaton fields. The gravitational-anomaly terms owe their existence to the Green–Schwarz mechanism for the (extra-dimensional) anomaly cancellation, and may be non-trivial in such theories in the presence of (primordial) gravitational waves at early stages of the four-dimensional string universe (after compactification). The paper also discusses how the torsion-induced stringy axions can acquire a mass in the post inflationary era, due to non-perturbative effects, thus having the potential to play the role of (a component of) dark matter in such models. Finally, the current-era phenomenology of this model is briefly described with emphasis placed on the possibility of alleviating tensions observed in the current-era cosmological data. A brief phenomenological comparison with other cosmological models in contorted geometries is also made.

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“…It is clear that the answer to this question is encrypted within such a late time phenomena which indeed carries the information of the early universe. One such phenomena is "cosmological quantum entanglement" of a scalar field coupled with the KR field [144]. Motivated by this, we also address the cosmological particle production and the quantum entanglement of the scalar field in the present review.…”

Section: Introductionmentioning

confidence: 99%

Antisymmetric Tensor Fields in Modified Gravity: A Summary

Paul

2020

Symmetry

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We provide various aspects of second rank antisymmetric Kalb–Ramond (KR) field in modified theories of gravity. The KR field energy density is found to decrease with the expansion of our universe at a faster rate in comparison to radiation and matter components. Thus as the universe evolves and cools down, the contribution of the KR field on the evolutionary process reduces significantly, and at present it almost does not affect the universe evolution. However the KR field has a significant contribution during early universe; in particular, it affects the beginning of inflation as well as increases the amount of primordial gravitational radiation and hence enlarges the value of tensor-to-scalar ratio in respect to the case when the KR field is absent. In regard to the KR field couplings, it turns out that in four dimensional higher curvature inflationary model the couplings of the KR field to other matter fields is given by 1/MPl (where MPl is known as the “reduced Planck mass” defined by MPl=18πG with G is the “Newton’s constant”) i.e., same as the usual gravity–matter coupling; however in the context of higher dimensional higher curvature model the KR couplings get an additional suppression over 1/MPl. Thus in comparison to the four dimensional model, the higher curvature braneworld scenario gives a better explanation of why the present universe carries practically no footprint of the Kalb–Ramond field. The higher curvature term in the higher dimensional gravitational action acts as a suitable stabilizing agent in the dynamical stabilization mechanism of the extra dimensional modulus field from the perspective of effective on-brane theory. Based on the evolution of KR field, one intriguing question can be—“sitting in present day universe, how do we confirm the existence of the Kalb–Ramond field which has considerably low energy density (with respect to the other components) in our present universe but has a significant impact during early universe?” We try to answer this question by the phenomena “cosmological quantum entanglement” which indeed carries the information of early universe. Finally, we briefly discuss some future perspectives of Kalb–Ramond cosmology at the end of the paper.

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Cosmological quantum entanglement: a possible testbed for the existence of Kalb–Ramond field

Cited by 7 publications

References 54 publications

Torsion in string-inspired cosmologies and the universe dark sector

Torsion in string-inspired cosmologies and the universe dark sector

Torsion in String-Inspired Cosmologies and the Universe Dark Sector

Antisymmetric Tensor Fields in Modified Gravity: A Summary

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