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Author Asenjo, F.A.; Hojman, S.A. doi  openurl
  Title Birefringent light propagation on anisotropic cosmological backgrounds Type Journal Article
  Year 2017 Publication Physical Review D Abbreviated Journal Phys. Rev. D  
  Volume 96 Issue 4 Pages 12 pp  
  Keywords  
  Abstract Exact electromagnetic wave solutions to Maxwell equations on anisotropic Bianchi I cosmological spacetime backgrounds are studied. The waves evolving on Bianchi I spacetimes exhibit birefringence (associated with linear polarization) and dispersion. The particular case of a vacuum-dominated anisotropic Universe, which reproduces a Friedmann-Robertson-Walker Universe (for late times)-while, for earlier times, it matches a Kasner Universe-is studied. The electromagnetic waves do not, in general, follow null geodesics. This produces a modification of the cosmological redshift, which is then dependent on light polarization, its dispersion, and its non-null geodesic behavior. New results presented here may help to tackle some issues related to the “horizon” problem.  
  Address [Asenjo, Felipe A.; Hojman, Sergio A.] Univ Adolfo Ibanez, UAI Phys Ctr, Santiago 7941169, Chile, Email: felipe.asenjo@uai.cl;  
  Corporate Author Thesis  
  Publisher Amer Physical Soc Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2470-0010 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000407716200007 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 756  
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Author Canfora, F.E.; Dudal, D.; Justo, I.F.; Pais, P.; Salgado-Rebolledo, P.; Rosa, L.; Vercauteren, D. doi  openurl
  Title Double nonperturbative gluon exchange: An update on the soft-Pomeron contribution to pp scattering Type Journal Article
  Year 2017 Publication Physical Review C Abbreviated Journal Phys. Rev. C  
  Volume 96 Issue 2 Pages 8 pp  
  Keywords  
  Abstract We employ a set of recent, theoretically motivated fits to nonperturbative unquenched gluon propagators to check on how far double gluon exchange can be used to describe the soft sector of pp scattering data (total and differential cross section). In particular, we use the refined Gribov-Zwanziger gluon propagator (as arising from dealing with the Gribov gauge fixing ambiguity) and the massive Cornwall-type gluon propagator (as motivated from Dyson-Schwinger equations) in conjunction with a perturbative quark-gluon vertex, next to a model based on the nonperturbative quark-gluon Maris-Tandy vertex, popular from Bethe-Salpeter descriptions of hadronic bound states. We compare the cross sections arising from these models with older ISR and more recent TOTEM and ATLAS data. The lower the value of total energy root s, the better the results appear to be.  
  Address [Canfora, F. E.; Pais, P.] Ctr Estudios Cient, Casilla 1469, Valdivia, Chile, Email: fcanforat@gmail.com;  
  Corporate Author Thesis  
  Publisher Amer Physical Soc Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2469-9985 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000407017900004 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 751  
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Author Ekman, R.; Asenjo, F.A.; Zamanian, J. doi  openurl
  Title Relativistic kinetic equation for spin-1/2 particles in the long-scale-length approximation Type Journal Article
  Year 2017 Publication Physical Review E Abbreviated Journal Phys. Rev. E  
  Volume 96 Issue 2 Pages 8 pp  
  Keywords  
  Abstract In this paper, we derive a fully relativistic kinetic theory for spin-1/2 particles and its coupling to Maxwell's equations, valid in the long-scale-length limit, where the fields vary on a scale much longer than the localization of the particles; we work to first order in (h) over bar. Our starting point is a Foldy-Wouthuysen (FW) transformation, applicable to this regime, of the Dirac Hamiltonian. We derive the corresponding evolution equation for the Wigner quasidistribution in an external electromagnetic field. Using a Lagrangian method we find expressions for the charge and current densities, expressed as free and bound parts. It is furthermore found that the velocity is nontrivially related to the momentum variable, with the difference depending on the spin and the external electromagnetic fields. This fact that has previously been discussed as “hidden momentum” and is due to that the FW transformation maps pointlike particles to particle clouds for which the prescription of minimal coupling is incorrect, as they have multipole moments. We express energy and momentum conservation for the system of particles and the electromagnetic field, and discuss our results in the context of the Abraham-Minkowski dilemma.  
  Address [Ekman, R.; Zamanian, J.] Umea Univ, Dept Phys, SE-90187 Umea, Sweden  
  Corporate Author Thesis  
  Publisher Amer Physical Soc Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2470-0045 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000408118100012 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 759  
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Author Garmendia, M.L.; Mondschein, S.; Matus, O.; Murrugarra, R.; Uauy, R. doi  openurl
  Title Predictors of gestational weight gain among Chilean pregnant women: The Chilean Maternal and Infant Nutrition Cohort study Type Journal Article
  Year 2017 Publication Health Care For Women International Abbreviated Journal Health Care Women Int.  
  Volume 38 Issue 8 Pages 892-904  
  Keywords  
  Abstract We identified factors associated with gestational weight gain (GWG) in 1,654 Chilean pregnant women with full-term pregnancies. At baseline, we collected information about sociodemographic, gyneco-obstetric, anthropometric, and health-care-related factors. We found that prepregnancy nutritional body mass index was the most important factor related to GWG above recommendations (overweight: ratio of relative risks [RRR] = 2.31, 95% confidence interval [CI, 1.73, 3.09] and obesity: RRR = 2.90, 95% CI [2.08, 4.03]). We believe that women who are overweight/obese at the beginning of pregnancy should be identified because of their higher risk, and that adequate strategies should be designed and implemented to help them achieve a healthy GWG.  
  Address [Luisa Garmendia, Maria; Uauy, Ricardo] Univ Chile, Inst Nutr & Food Technol, Libano 5524, Santiago, Chile, Email: mgarmendia@inta.uchile.cl  
  Corporate Author Thesis  
  Publisher Taylor & Francis Inc Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0739-9332 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000407518400009 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 758  
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Author Munoz, F.D.; Pumarino, B.J.; Salas, I.A. pdf  doi
openurl 
  Title Aiming low and achieving it: A long-term analysis of a renewable policy in Chile Type Journal Article
  Year 2017 Publication Energy Economics Abbreviated Journal Energy Econ.  
  Volume 65 Issue Pages 304-314  
  Keywords Planning model; Renewable portfolio standard; Renewable energy certificates  
  Abstract We use an Integrated Resource Planning model to assess the costs of meeting a 70% renewables target by 2050 in Chile. This model is equivalent to a long-term equilibrium in electricity and renewable energy certificate (REC) markets under perfect competition. We consider different scenarios of demand growth, resource eligibility (e.g., large hydropower), and transmission system configuration. Our numerical results indicate that the sole characteristics of the available renewable resources in the country and reductions in technology costs will provide sufficient economic incentives for private investors to supply a fraction of renewables larger than 70% for a broad range of scenarios, meaning that the proposed target will likely remain a symbolic government effort. Increasing transmission capacity between the northern and central interconnected systems could reduce total system cost by $400 million per year and increase the equilibrium share of non conventional renewable energy (NCRE) in the system from 45% to 52%, without the need for any additional policy incentive. Surprisingly, imposing a 70% of NCRE by 2050 results in a REC price lower than the noncompliance fine used for the current target of 20% of NCRE by 2025, the latter of which represents the country's maximum willingness to pay for the attributes of electricity supplied from NCRE resources. (C) 2017 Elsevier B.V. All rights reserved.  
  Address [Munoz, Francisco D.; Pumarino, Bruno J.; Salas, Ignacio A.] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Diagonal Torres 2640,Oficina 303D, Santiago, Chile, Email: fdmunoz@uai.cl  
  Corporate Author Thesis  
  Publisher Elsevier Science Bv Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0140-9883 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000406731900028 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 753  
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Author Nasirov, S.; Agostini, C.A.; Silva, C. doi  openurl
  Title An assessment of the implementation of renewable energy sources in the light of concerns over Chilean policy objectives Type Journal Article
  Year 2017 Publication Energy Sources Part B-Economics Planning And Policy Abbreviated Journal Energy Sources Part B  
  Volume 12 Issue 8 Pages 715-721  
  Keywords Chile; MCDA; policy objectives; renewable energy; sensitivity analysis  
  Abstract In recent years, the development of renewable energies in the electricity market in Chile has gained significant attention as a key alternative for energy sources diversification and meeting three key policy objectives: energy availability, environmental protection, and social-economic development. This study aims to assess various renewable energy sources in order to select suitable sources to accomplish the different policy goals in a country like Chile. For this purpose, a Multi-Criteria Decision Analysis (MCDA) method is employed to evaluate the relative importance of policy objectives. In addition, a sensitivity analysis is conducted to build various different policy scenarios measuring the impact of variations on the current weights of the decision criteria. The results show that solar, wind, and small hydro are the preferred sources in the Chilean renewable energy portfolio, maximizing the objective of meeting the three policy goals at the same time.  
  Address [Nasirov, Shahriyar; Silva, Carlos] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Ave Diagonal Torres 2640, Santiago, Chile, Email: shahriyar.nasirov@uai.cl  
  Corporate Author Thesis  
  Publisher Taylor & Francis Inc Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1556-7249 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000407930900006 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 757  
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