Violencia Política y Conflictos Sociales en América Latina

Barreira, César; Arana, Roberto González; Rosero, Luis Fernando Trejos; Guerrero, Ivonne Molinares; Santos, José Vicente Tavares dos; Viscardi, Nilia; Barbero, Marcia; V., Loreto Correa; Serrano, Mary Luz Estupiñán; Siegert, Clara Inés Aramburo; Favaro, Orietta; Iuorno, Graciela; Aquino, Jania Perla Diógenes de

doi:10.14482/memor.22.6080

Cited by 8 publications

(8 citation statements)

References 13 publications

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“…In particular one can expect that, leaving the neutrino masses as free parameters, within the priors allowed by oscillation experiments, should improve the agreement with the data of the RR model, rendering it again competitive with ΛCDM. This possibility is currently being investigated in [98].…”

Section: Discussionmentioning

confidence: 99%

“…two massless and a massive neutrinos, with ν m ν = 0.06 eV, and we are fixing the effective number of neutrino species to N eff = 3.046. In the Conclusions, following [98], we will shortly comment on the effect of the neutrino masses.…”

Section: Parameter Space and Mcmcmentioning

confidence: 99%

“…In turn such larger neutrino masses would have the effect of decreasing σ 8 , which could render again the RR model fully competitive with ΛCDM, also from the point of view of fitting structure formation data. The corresponding analysis will be presented in [98].…”

Section: Growth Rate Data and Modified Structure Formationmentioning

confidence: 99%

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Non-local gravity and comparison with observational datasets. II. Updated results and Bayesian model comparison with ΛCDM

Dirian

Foffa

Kunz

et al. 2016

J. Cosmol. Astropart. Phys.

166

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We present a comprehensive and updated comparison with cosmological observations of two non-local modifications of gravity previously introduced by our group, the so called RR and RT models. We implement the background evolution and the cosmological perturbations of the models in a modified Boltzmann code, using CLASS. We then test the non-local models against the Planck 2015 TT, TE, EE and Cosmic Microwave Background (CMB) lensing data, isotropic and anisotropic Baryonic Acoustic Oscillations (BAO) data, JLA supernovae, H 0 measurements and growth rate data, and we perform Bayesian parameter estimation. We then compare the RR, RT and ΛCDM models, using the Savage-Dickey method. We find that the RT model and ΛCDM perform equally well, while the performance of the RR model with respect to ΛCDM depends on whether or not we include a prior on H 0 based on local measurements. arXiv:1602.03558v2 [astro-ph.CO] 22 May 2016 2 This is analogous to the fact that, in a Deser-Woodard type model, a term of the form R µν f (2 −1 Rµν ) shows instabilities [60].3 See also app. B below, where we will discuss a related issue on the comparison with Lunar Laser Ranging, raised in [64].4 It should also be appreciated that a non-local model such as the RT or the RR model only introduces one new parameter m, which replaces the cosmological constant in ΛCDM. By comparison, bigravity replaces the cosmological constant by a set of 5 parameters βn, n = 0, . . . , 4 and also introduces a new Planck mass associated to the second metric, and viable solutions are searched tuning this parameter space. Similarly, in the Deser-Woodard model one tunes a whole function f (X).

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Section: Discussionmentioning

confidence: 99%

Section: Parameter Space and Mcmcmentioning

confidence: 99%

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Non-local gravity and comparison with observational datasets. II. Updated results and Bayesian model comparison with ΛCDM

Dirian

Foffa

Kunz

et al. 2016

J. Cosmol. Astropart. Phys.

166

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“…A larger prior on neutrino masses would therefore favor the nonlocal models over Λ CDM. This possibility is currently being investigated[80].…”

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confidence: 99%

Nonlocal Infrared Modifications of Gravity. A Review

Maggiore

2017

Fundamental Theories of Physics

118

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We review an approach developed in the last few years by our group in which GR is modified in the infrared, at an effective level, by nonlocal terms associated to a mass scale. We begin by recalling the notion of quantum effective action and its associated nonlocalities, illustrating some of their features with the anomaly-induced effective actions in D = 2 and D = 4. We examine conceptual issues of nonlocal theories such as causality, degrees of freedoms and ghosts, stressing the importance of the fact that these nonlocalities only emerge at the effective level. We discuss a particular class of nonlocal theories where the nonlocal operator is associated to a mass scale, and we show that they perform very well in the comparison with cosmological observations, to the extent that they fit CMB, supernovae, BAO and structure formation data at a level fully competitive with Λ CDM, with the same number of free parameters. We explore some extensions of these 'minimal' models, and we finally discuss some directions of investigation for deriving the required effective nonlocality from a fundamental local QFT.

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“…Frente a este panorama complejo y crítico de la violencia global y de los conflictos armados internos e interestatales, América Latina se presenta como una de las regiones en donde no existe un nivel de confrontación armada como el que actualmente se vive en regiones como Siria, Irak y Libia, o, inclusive en Ucrania; ya que su caracterización no se encuentra mediada por fundamentalismos religiosos o de falta de identidad como nación; sino que se ubican más en el ámbito de la violencia política y los conflictos sociales (Barreira, González y Trejos, 2013) Estas circunstancias en Latinoamérica tienen diversas lecturas sobre las causas o factores que han tenido mayor incidencia, como es el caso de Tavares (2013) que considera que el problema radica en el déficit de transición democrática el cual se materializa en aspectos como "la situación de las prisiones; los modos de funcionamiento de las policías; las dificultades de acceso a la justicia; la selectividad social de la justicia penal; y la pérdida de legitimidad de las instituciones de control social" (p. 56).…”

Section: Panorámica Regional Del Conflicto Armado: América Latina Y Eunclassified

El riesgo permitido en las operaciones tipo beta desarrolladas por la fuerza aérea colombiana en el marco del conflicto armado interno en Colombia

Ángel¹,

Mauricio²

2016

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Violencia Política y Conflictos Sociales en América Latina

Cited by 8 publications

References 13 publications

Non-local gravity and comparison with observational datasets. II. Updated results and Bayesian model comparison with ΛCDM

Non-local gravity and comparison with observational datasets. II. Updated results and Bayesian model comparison with ΛCDM

Nonlocal Infrared Modifications of Gravity. A Review

El riesgo permitido en las operaciones tipo beta desarrolladas por la fuerza aérea colombiana en el marco del conflicto armado interno en Colombia

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