Results 21 to 30 of about 24,382 (148)
Accelerated expansion from a non-minimal gravitational coupling to matter
, 2010 It is shown that a non-minimal coupling between the scalar curvature and the matter Lagrangian density may account for the accelerated expansion of the Universe and provide, through mimicking, for a viable unification of dark energy and dark matter.
Bertolami, O., Frazao, P., Páramos, J.
core +1 more source
Inflation with a massive vector field nonminimally coupled to gravity
, 2016 We study the possibility that inflation is driven by a massive vector field with SO(3) global symmetry nonminimally coupled to gravity. From an E^3-invariant Robertson-Walker metric we propose an Ansatz for the vector field, allowing us to study the ...
Bertolami, O., Bessa, V., Páramos, J.
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Support system for speculation by exchange trades funds
Mokslas: Lietuvos Ateitis, 2022 The paper examines the possibilities of speculating in exchangetraded funds by using artificial intelligence. The main goal of the research is to create a support system for speculative decisionmaking for investors operating in exchange-traded funds ...
Gediminas Tumaševičius +1 more
doaj +1 more source
, 2012 In this work we study the dynamics of gravitational collapse of a homogeneous dust sphere in a model exhibiting a linear non-minimal coupling between matter and curvature. The evolution of the scale factor and the matter density is obtained for different
Bastos, C., Páramos, J.
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Estudio florístico de los páramos de pajonal meridionales de Ecuador
Revista Peruana de Biología, 2013 El presente trabajo es un estudio de la flora de los páramos de pajonal seriales de distintos macizos montañosos de los Andes del Sur de Ecuador (provincias de Azuay y Loja) comprendidos entre los 2850 m y 3635 m.
Jesús Izco +3 more
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Frontiers in Ecology and Evolution, 2023 Páramos are one of the flagship ecosystems in the Northern Andes; the provision of water for millions of people in this region depends on these unique high mountains located at above 3,500 m of altitude.
Camilo Castillo-Estupiñan
doaj +1 more source
Probing the Flyby Anomaly with the future STE-QUEST mission
, 2012 In this study, we demonstrate that the flyby anomaly, an unexpected acceleration detected in some of the gravitational assists of the Galileo, NEAR, Cassini and Rosetta spacecraft, could be probed by accurate orbital tracking available in the proposed ...
Hechenblaikner, Gerald, Páramos, Jorge
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Grassland Research, EarlyView.Plant species richness was greater in summer in both alpine and subalpine grassland ecosystems. Soil moisture demonstrates significant positive correlations with soil organic carbon and total nitrogen across seasonal periods. Microbial α‐diversity peaks during summer but maintains functional stability across seasons.
Huma Ali +4 more
wiley +1 more source
Revista Mexicana de Biodiversidad, 2021 Some recent contributions to the biogeographic regionalization of the Páramo province are reviewed and compared. As a result, a consensus regionalization is proposed, recognizing 6 subprovinces and 11 districts: Páramos del Norte subprovince (Sierra ...
Juan J. Morrone
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Using global positioning systems to test extensions of General Relativity
, 2011 We consider the feasibility of using the Galileo Navigation Satellite System to constrain possible extensions or modifications to General Relativity, by assessing the impact of the related additions to the Newtonian potential and comparing with the ...
Bertolami, O., Páramos, J.
core +1 more source