Results 51 to 60 of about 32,030 (214)
Generalized curvature-matter couplings in modified gravity
, 2014 In this work, we review a plethora of modified theories of gravity with generalized curvature-matter couplings. The explicit nonminimal couplings, for instance, between an arbitrary function of the scalar curvature $R$ and the Lagrangian density of ...
Harko, Tiberiu, Lobo, Francisco S. N.
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Matter density perturbations in modified gravity models with arbitrary coupling between matter and geometry [PDF]
, 2009 We consider theories with an arbitrary coupling between matter and gravity and obtain the perturbation equation of matter on subhorizon scales. Also, we derive the effective gravitational constant $G_{eff}$ and two parameters $\Sigma$ and $\eta$, which ...
C. Wetterich +4 more
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Diversity and Distributions, Volume 32, Issue 5, May 2026.ABSTRACT Aim Peru, a megadiverse country, has developed conservation plans for some threatened wildlife species. This study produced spatially explicit data integrating Species Distribution Models (SDMs) into a geospatial analysis of connectivity within the protected areas (PAs) network.
Alexander Cotrina‐Sanchez +4 more
wiley +1 more source
Energy Conditions in $f(R,T,R_{\mu\nu}T^{\mu\nu})$ Gravity
, 2013 We discuss the validity of the energy conditions in a newly modified theory named as $f(R,T,R_{\mu\nu}T^{\mu\nu})$ gravity, where $R$ and $T$ represent the scalar curvature and trace of the energy-momentum tensor.
Sharif, M., Zubair, M.
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Revealing patterns of endemism in the transatlantic family Chelodesmidae (Polydesmida: Diplopoda)
Cladistics, Volume 42, Issue 2, Page 159-171, April 2026.Abstract With fossil records dating back to the Silurian/Late Ordovician, millipedes stand out as one of the earliest terrestrial animal groups. Their limited vagility and high endemism make them valuable tools for formulating and testing biogeographic hypotheses, including those related to macro‐vicariance events.
Rodrigo Salvador Bouzan +4 more
wiley +1 more source
Paramos smulkiam ir vidutiniam verslui efektyvumo vertinimas
Ekonomika, 2007 Straipsnyje analizuojamos paramos smulkiam ir vidutiniam verslui (SW) efektyvumo vertinimo problemos, pateikiami argumentai, kodėl būtina sukurti paramos SW efektyvumo vertinimo daugiakriterinę metodiką, pagrįstą socialinio, ekonominio ir aplinkosauginio
Dalia Štreimikienė +2 more
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Journal of Biogeography, Volume 53, Issue 4, April 2026.ABSTRACT Aim To identify Neotropical ecoregions experiencing compound environmental exposure to El Niño/La Niña‐driven climate variability, deforestation trends and fire‐induced forest loss. Location Neotropical realm. Methods We quantified historical exposure to ENSO‐related climate variability by correlating the Oceanic Niño Index with four ...
Andres González‐González +3 more
wiley +1 more source
Recuperación del funcionamiento hidrológico de ecosistemas de páramo en Colombia
Revista U.D.C.A Actualidad & Divulgación Científica, 2017 Los páramos son ecosistemas que se caracterizan por una alta humedad relativa, alta frecuencia de niebla y por tener una vegetación arbustiva y herbácea, adaptada a las condiciones de alta montaña. En condiciones naturales estos ecosistemas presentan una
María Fernanda Cárdenas +1 more
doaj +3 more sources
Revista Facultad Nacional de Agronomía Medellín, 2008 Este estudio se realizó en el Área de Manejo Especial (AME) “Sistema de Páramos y Bosques Altoandinos del Noroccidente Medio Antioqueño”, localizada en el Departamento de Antioquia, Colombia. El AME tiene una extensión total de 34.358,74 ha.
Leodán Andrés Otaya Burbano +2 more
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Modified Gravity with a Non-minimal Gravitational Coupling to Matter
, 2012 We consider modified theories of gravity with a direct coupling between matter and geometry, denoted by an arbitrary function in terms of the Ricci scalar.
S. W. Hawking, Yousef Bisabr
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