What local supersymmetry can do for cosmology?

Escamilla-Rivera, Celia; Obregón, O.; Morales‐Técotl, H. A.; Ureña–López, L. Arturo; Linares, Román; García‐Compeán, Hugo

doi:10.1063/1.3473863

Cited by 7 publications

(10 citation statements)

References 15 publications

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“…[16,17]. The compatibility between SNIa and BAO data was investigated in two different dark energy EoS reconstructions including the well known Chevalier-Polarski-Linder (CPL) model [18]. Further papers have also noticed this disagreement in cosmographic studies using different probes.…”

Section: Introductionmentioning

confidence: 99%

“…Secondly, priors on the cosmological parameters including Ω m and Ω b may strongly influence the estimated values of the EoS parameters [15,25]. However, by considering 1σ deviations of the matter fraction parameters for some priors, there appears no tension among SN Ia, BAO and their combination (SN Ia+BAO) [18]. Thirdly, as long as compatibility is concerned, one cannot ignore the fact that tension may be brought by some caveats in the dark energy EoS parametrization.…”

Section: Introductionmentioning

confidence: 99%

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Cosmic equation of state from combined angular diameter distances: Does the tension with luminosity distances exist?

Cao

Zhu

2014

Phys. Rev. D

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Using a relatively complete observational data concerning four angular diameter distance (ADD) measurements and combined SN+GRB observations representing current luminosity distance (LD) data, this paper investigates the compatibility of these two cosmological distances considering three classes of dark energy equation of state (EoS) reconstruction. In particular, we use strongly gravitationally lensed systems from various large systematic gravitational lens surveys and galaxy clusters, which yield the Hubble constant independent ratio between two angular diameter distances D ls /Ds data. Our results demonstrate that, with more general categories of standard ruler data, ADD and LD data are compatible at 1σ level. Secondly, we note that consistency between ADD and LD data is maintained irrespective of the EoS parameterizations: there is a good match between the universally explored CPL model and other formulations of cosmic equation of state. Especially for the truncated GEoS model with β = −2, the conclusions obtained with ADD and LD are almost the same. Finally, statistical analysis of generalized dark energy equation of state performed on four classes of ADD data provides stringent constraints on the EoS parameters w0, w β and β, which suggest that dark energy was a subdominant component at early times. Moreover, the GEoS parametrization with β ≃ 1 seems to be a more favorable two-parameter model to characterize the cosmic equation of state, because the combined angular diameter distance data (SGL+CBF+BAO+WMAP9) provide the best-fit value β = 0.751 +0.465 −0.480 .PACS numbers: 98.70.Vcwhere H 0 is the Hubble constant, c is the speed of light, E(z; p) = H/H 0 is the expansion rate that has different forms with different cosmological model parameters p, and Ω k is the spatial curvature density *

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cosmic equation of state from combined angular diameter distances: Does the tension with luminosity distances exist?

Cao

Zhu

2014

Phys. Rev. D

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“…In order to resolve these singularities, an appealing proposal for a modified theory of gravity, the so-called Eddingtoninspired Born-Infeld (EiBI) theory, was recently put forward in Ref. [2] and it has been subject to scrutiny in a number of works [3][4][5][6][7][8][9][10][11][12][13]. EiBI gravity is equivalent to general relativity in vacuum and does not propagate any degree of freedom other than a massless graviton.…”

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confidence: 99%

Surface Singularities in Eddington-Inspired Born-Infeld Gravity

Pani¹,

2012

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Eddington-inspired Born-Infeld gravity was recently proposed as an alternative to general relativity that offers a resolution of spacetime singularities. The theory differs from Einstein's gravity only inside matter due to nondynamical degrees of freedom, and it is compatible with all current observations. We show that the theory is reminiscent of Palatini f(R) gravity and that it shares the same pathologies, such as curvature singularities at the surface of polytropic stars and unacceptable Newtonian limit. This casts serious doubt on its viability.

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“…In this scenario, the vacuum solution for the wave equation is not the traditional due that extra terms that come from Weyl terms could play an important role in the propagation and speed of GWs. Previous results have been focused in weak field limit, studying the consequences of the quadratic part of the energy-momentum tensor in the dynamics of binary system (see for instance [31]) and also in extended theories of gravity [32,33].…”

Section: Arxiv:200108745v2 [Gr-qc] 31 Mar 2020mentioning

confidence: 99%

Gravitational waves in braneworlds after multi-messenger events

García‐Aspeitia

Escamilla-Rivera

2020

Eur. Phys. J. C

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The GW170817 event opened a new window to test modifications to General Relativity with the aim of discard or impose strong constraints in extra dimension theories of gravity. Concerning these theories, the Randall-Sundrum brane-world theory -4+1 spacetime model where its covariant Einstein field equations are composed with new extra terms that comes from extra dimensions -is begin tested in the multi-messenger astronomy field. In the same context, the aim of this paper is to impose new constrictions through measurements of the time-delay between the gravitational and electromagnetic signals: GW170817 and the recent S190425z, over the free cosmological parameters of this modified model. We assume that Gravitational Waves travel along a shortcut on the extra dimension. In addition, we consider the standard Λ CDM model and perform a likelihood analysis in order to study effects like the H 0 tension in comparison to this extra-dimensional theory, obtaining a reduced H 0 value of the order of 0.2% in the low energy limit of this theory.

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What local supersymmetry can do for cosmology?

Abstract: Abstract. We study the case of a supersymmetric FRW model in a flat space in the superfield formulation. Some exact solutions of the model are found and we provide a range of possible applications in the evolution of the Universe at early times for two scalar fields potentials.

Cited by 7 publications

References 15 publications

Cosmic equation of state from combined angular diameter distances: Does the tension with luminosity distances exist?

Cosmic equation of state from combined angular diameter distances: Does the tension with luminosity distances exist?

Surface Singularities in Eddington-Inspired Born-Infeld Gravity

Gravitational waves in braneworlds after multi-messenger events

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