Results 151 to 160 of about 9,790 (281)

Density perturbations in warm inflation and COBE normalization

, 2002
Starting from a gauge invariant treatment of perturbations an analytical expression for the spectrum of long wavelength density perturbations in warm inflation is derived. The adiabatic and entropy modes are exhibited explicitly. As an application of the
de Oliveira, H.P.
core   +1 more source

Age‐related trends in niche position and specialization in Neotropical vertebrates

Ecography, EarlyView.
Species' niche positions and breadths within a region's environmental space, measured through ecological niche factor analysis (ENFA) as marginality and specialization, can reflect evolutionary constraints related to lineage age. The ‘internal incumbency' hypothesis predicts that older species, due to competitive preemption, occupy more central niche ...
Carlos Calderón del Cid, Fabricio Villalobos, Ricardo Dobrovolski, Bruno Vilela   +3 more
wiley   +1 more source

Plant adaptive strategies respond to environmental change across European grassland habitats

Ecography, EarlyView.
Grassland ecosystems are facing rapid and ongoing change driven by intensified land‐use and accelerated climate change, highlighting the urgent need to understand their potential adaptation and response to environmental change. We analyzed data from 52 980 vegetation plots spanning all major grassland habitats in Europe (including alpine, rocky, sandy,
Xiao‐Peng Tan, Petr Pyšek, Milan Chytrý, Irena Axmanová, Jan Divíšek, Ilona Knollová, Svetlana Aćić, Idoia Biurrun, Hans Henrik Bruun, Jürgen Dengler, Tetiana Dziuba, Emmanuel Garbolino, Attila Lengyel, Jonathan Lenoir, Ricarda Pätsch, Aaron Pérez‐ Haase, Valerijus Rašomavičius, Eszter Ruprecht, Urban Šilc, Kiril Vassilev, Yi‐Jun Wang, Wen‐Yong Guo   +21 more
wiley   +1 more source

Constraining warm inflation with the cosmic microwave background

, 2004
We discuss the spectrum of scalar density perturbations from warm inflation when the friction coefficient Γ in the inflaton equation is dependent on the inflaton field.
Hall, Lisa M.H., Berera, Arjun, Moss, Ian G.   +2 more
core   +1 more source

Perturbation Spectra of Warm Inflation in f(Q, T) Gravity

The Astrophysical Journal
We investigate the warm inflationary scenario within the context of the linear version of f ( Q , T ) gravity, coupled with both the inflaton scalar field and the radiation field, under the conditions of the strong dissipation regime. First, we calculate
Maryam Shiravand, Mehrdad Farhoudi, Parviz Goodarzi   +2 more
doaj   +1 more source

Thermal gravitons from warm inflation

Physical Review D
In warm inflation (WI), the persistent thermal bath that is sustained by dissipative interactions with the inflaton field produces a stochastic background of gravitational waves (GWs). In this paper we study the production and evolution of these GWs.
Gabriele Montefalcone, Barmak Shams Es Haghi, Tao Xu, Katherine Freese   +3 more
openaire   +2 more sources

Citizen science deepens the ecological and climatic dimensions of mosquito surveillance

Ecography, EarlyView.
As mosquito‐borne diseases continue to expand worldwide, integrating citizen science into vector surveillance presents untapped potential. This study compares ecological models of Aedes albopictus, an invasive mosquito and global vector of dengue and other arboviruses, in Spain (2020–2022), using two contrasting data sources: traditional traps and ...
Catuxa Cerecedo‐Iglesias, John R. B. Palmer, Frederic Bartumeus   +2 more
wiley   +1 more source

Climatic drivers prevail in montane and lowland Odonata latitudinal diversity gradients, but human modification erodes lowland patterns

Ecography, EarlyView.
Latitudinal diversity gradients (LDGs) arise from the interplay of historical, ecological, and evolutionary processes, yet these drivers may differ across landforms. Mountains, with steep elevational and climatic gradients, often sustain distinct diversity dynamics compared with adjacent lowlands, where vertical climatic gradients are weak and human ...
Zhenyuan Liu, Bo‐Ping Han, Haomiao Zhang, Ramiro Martín‐Devasa, Jens‐Christian Svenning, Janne Soininen   +5 more
wiley   +1 more source

Solar Fuels Via Methane Valorization: Thermochemical Pathways, Unified Metrics, and Techno‐Economic Perspectives

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
A first‐of‐its‐kind review benchmarks three solar methane valorization pathways with unified performance metrics for clean fuel production. Meeting global climate targets and sustainable energy demands requires carbon‐neutral fuels and innovative conversion pathways.
Muhammad Abdulmoez, Amjad Othman, Majid Linjawi, Amro Al‐Qutub   +3 more
wiley   +1 more source

Forecasting heart failure: Seasonal alignment of heart failure outcomes in New York

ESC Heart Failure, Volume 12, Issue 2, Page 819-831, April 2025.
Abstract Background Seasonal variations have been observed in heart failure (HF) hospitalization. Numerous explanatory mechanisms have been proposed, but no prior studies have examined potential contributors directly. Our objective was to identify specific factors that could contribute to seasonal variability using a large longitudinal dataset of HF ...
Prerna Gupta, Ellen Brinza, Prateeti Khazanie, Pamela N. Peterson, P Michael Ho, David P. Kao   +5 more
wiley   +1 more source