2019
DOI: 10.1140/epjc/s10052-019-7109-5
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Dynamical suppression of spacetime torsion

Abstract: A surprising feature of our present four dimensional universe is that its evolution appears to be governed solely by spacetime curvature without any noticeable effect of spacetime torsion. In the present paper, we give a possible explanation of this enigma through "cosmological evolution" of spacetime torsion in the backdrop of a higher dimensional braneworld scenario. Our results reveal that the torsion field may had a significant value at early phase of our universe, but gradually decreased with the expansio… Show more

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Cited by 13 publications
(9 citation statements)
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“…Moreover, the suppression of field has been discussed in several physical scenarios, e.g. in the context of warped brane-world models [60] with bulk Kalb-Ramond fields [61,62] and the related stabilization of the modulus [63], in the context of higher curvature gravity where the associated scalar degrees of freedom diminishes the coupling of such a field with the Standard Model fermions [64, and in the inflationary era induced by higher curvature gravity [66,67] and higher dimensions [68].…”
Section: Discussionmentioning
confidence: 99%
“…Moreover, the suppression of field has been discussed in several physical scenarios, e.g. in the context of warped brane-world models [60] with bulk Kalb-Ramond fields [61,62] and the related stabilization of the modulus [63], in the context of higher curvature gravity where the associated scalar degrees of freedom diminishes the coupling of such a field with the Standard Model fermions [64, and in the inflationary era induced by higher curvature gravity [66,67] and higher dimensions [68].…”
Section: Discussionmentioning
confidence: 99%
“…The demonstration goes as follows: its equation of state (EoS) parameter is unity, and the conservation equation of the KR field is given by _ ρ KR þ 6Hρ KR ¼ 0, solving which one obtains ρ KR ∝ 1=a 6 ; i.e., the energy density of the KR field decreases with faster rate in comparison to pressureless matter and radiation. (The negligible footprint of the KR field in the present Universe can also be described from the higher dimensional point of view [81] where the KR field is generally considered to be a bulk field and our four-dimensional visible Universe is a brane embedded within the higher dimensional spacetime; further a nondynamical approach is also presented in [82] to explain the imperceptible signatures of the KR field in our Universe.) Thereby, it clearly depicts that the present Universe may be free from the direct signatures of the KR field; however, the KR field has considerable effects during the early Universe (when the scale factor is small compared to the present one).…”
Section: A Holographic Cutoff For Fðrþ Inflationary Modelsmentioning
confidence: 92%
“…This in turn indicates a negligible field strength for axion whose suppression has been observed in several other physical scenarios, e.g. in the inflationary era induced by higher curvature gravity [102,103] and higher dimensions [104], in the warped braneworld scenario [105] with bulk Kalb-Ramond fields [106,107] and the related stabilization of the modulus [108] and so on. We further point out that our results are in agreement with a previous work [77] where such a conclusion has been independently arrived by investigating the observed jet power and the radiative efficiencies of the microquasars with the corresponding theoretical estimates in the Kerr-Sen background.…”
Section: Summary and Concluding Remarksmentioning
confidence: 75%