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Gravitational resonances in mimetic thick branes
http://repo.scoap3.org/record/32527
In this work, we investigate gravitational resonances in both single and double mimetic thick branes, which can provide a new way to detect the extra dimension. For the single brane model, we apply the relative probability proposed in [ Phys. Rev. D 80 (2009) 065019]. For the double brane model, we investigate the resonances quasi-localized on the double brane, on the sub-branes and between the sub-branes, respectively. To investigate the resonances quasi-localized on the double brane, we introduce two different definitions of the relative probability and find that the corresponding mass spectra of gravitational resonances are almost the same. For the gravitational resonances quasi-localized on sub-branes and between the sub-branes, the influence of the distance between the two sub-branes and the thickness of the sub-branes are analyzed and new features are found in both cases.Zhong, YiThu, 02 May 2019 14:59:33 GMThttp://repo.scoap3.org/record/32527urn:ISSN:1029-8479Springer/SISSA2019-04-29Constraints on generalized Eddington-inspired Born-Infeld branes
http://repo.scoap3.org/record/32271
The Palatini f(|Ω^|) gravity is a generalized theory of the Eddington-inspired Born-Infeld gravity, where ΩKN≡δKN+bgKLRLN(Γ) is an auxiliary tensor constructed with the spacetime metric g and independent connection Γ. In this paper, we study f(|Ω^|) theory with f(|Ω^|)=|Ω^|12+n in the thick brane scenario and give some constraints on the brane model. We finally found an analytic solution of the thick brane generated by a single scalar field. The behavior of the negative energy density denotes the localization of the thick brane at the origin of the extra dimension. In our braneworld, the warp factor is divergent at the boundary of the extra dimension while the brane system is asymptotically anti–de Sitter. It is shown that the tensor perturbation of the brane is stable and the massless graviton is localized on the thick brane. Therefore, the effective Einstein-Hilbert action on the brane can be rebuilt in the low-energy approximation. According to the recent test of the gravitational inverse-square law, we give some constraints on the f(|Ω^|) brane.Lin, Zi-ChaoSat, 13 Apr 2019 00:17:25 GMThttp://repo.scoap3.org/record/32271urn:ISSN:2470-0029APS2019-04-12Thick branes with inner structure in mimetic gravity
http://repo.scoap3.org/record/23189
In this paper, thick branes generated by mimetic scalar field are investigated. Three typical thick brane models are constructed and the linear tensor and scalar perturbations are analyzed. These branes have different inner structures, some of which are absent in general relativity. For each brane model, the solution is stable under both tensor and scalar perturbations. The tensor zero modes are localized on the branes, while the scalar perturbations do not propagate and they are not localized on the brane. As the branes split into multi sub-branes for specific parameters, the potentials of the tensor perturbations also split into multi-wells, and this may lead to new phenomenon in the resonance of the tensor perturbation and the localization of matter fields.Zhong, YiFri, 19 Jan 2018 16:25:58 GMThttp://repo.scoap3.org/record/23189urn:ISSN:1434-6052Springer/Società Italiana di Fisica2018-1-19Localization and mass spectra of various matter fields on Weyl thin brane
http://repo.scoap3.org/record/20558
It has been shown that the thin brane model in a five-dimensional Weyl gravity can deal with the wrong-signed Friedmann-like equation in the Randall–Sundrum-1 (RS1) model. In the Weyl brane model, there are also two branes with opposite brane tensions, but the four-dimensional graviton (the gravity zero mode) is localized near the negative tension brane, while our four-dimensional universe is localized on the positive tension brane. In this paper, we consider the mass spectra of various bulk matter fields (i.e., scalar, vector, and fermion fields) on the Weyl brane. It is shown that the zero modes of those matter fields can be localized on the positive tension brane under some conditions. The mass spectra of the bulk matter fields are equidistant for the higher excited states, and relatively sparse for the lower excited states. The size of the extra dimension determines the gap of the mass spectra. We also consider the correction to the Newtonian potential in this model and it is proportional to 1/r3 .Sui, Tao-TaoTue, 20 Jun 2017 22:20:38 GMThttp://repo.scoap3.org/record/20558urn:ISSN:1434-6052Springer/Società Italiana di Fisica2017-6-19Full linear perturbations and localization of gravity on f ( R , T ) brane
http://repo.scoap3.org/record/19060
We study the thick brane world system constructed in the recently proposed f ( R , T ) theories of gravity, with R the Ricci scalar and T the trace of the energy-momentum tensor. We try to get the analytic background solutions and discuss the full linear perturbations, especially the scalar perturbations. We compare how the brane world model is modified with that of general relativity coupled to a canonical scalar field. It is found that some more interesting background solutions are allowed, and only the scalar perturbation mode is modified. There is no tachyon state existing in this model and only the massless tensor mode can be localized on the brane, which recovers the effective four-dimensional gravity. These conclusions hold provided that two constraints on the original formalism of the action are satisfied.Gu, Bao-MinSat, 18 Feb 2017 11:16:27 GMThttp://repo.scoap3.org/record/19060urn:ISSN:1434-6052Springer/Società Italiana di Fisica2017-2-18