Results 61 to 70 of about 60,199 (278)

COSMOLOGICAL PERTURBATIONS AND THE RUNNING COSMOLOGICAL CONSTANT MODEL [PDF]

International Journal of Modern Physics D, 2012
We study the matter density fluctuations in the running cosmological constant (RCC) model using linear perturbations in the longitudinal gauge. Using this observable, we calculate the growth rate of structures and the matter power spectrum, and compare these results to SDSS data and the available data for linear growth rate.
openaire   +2 more sources

Indigenous resurgence in the Blue Economy: Relational values to guide kelp mariculture

People and Nature, EarlyView.
Abstract Decisions about how to use ocean spaces are increasingly attuned to issues of social equity, environmental sustainability and climate resilience, yet often bypass local governance, knowledge, values and thus objectives. To inform future decisions about kelp harvest and mariculture activities on the west coast of Canada, we co‐designed research
Sarah B. Gutzmann, Charles Humchitt, Kevin Kowalchuk, Dorothy Hunt, Alyssa Allchurch, Andrés Cisneros‐Montemayor, Anne K. Salomon   +6 more
wiley   +1 more source

SCALAR COSMOLOGICAL PERTURBATIONS OF PRESSURELESS MATTER IN THE BRANEWORLD MODEL

Odessa Astronomical Publications, 2012
We present a complete set of differential equations describing the evolution of scalar cosmological perturbations of pressureless matter on the brane in the general case where the action of the model contains the induced-curvature term as well as the ...
A. V. Viznyuk, Yu. V. Shtanov
doaj   +1 more source

Evolution of Nonlinear Cosmological Perturbations

Physical Review Letters, 2005
We define fully non-perturbative generalizations of the uniform density and comoving curvature perturbations, which are known, in the linear theory, to be conserved on sufficiently large scales for adiabatic perturbations. Our non-linear generalizations are defined geometrically, independently of any coordinate system.
Langlois, David, Vernizzi, F.
openaire   +4 more sources

Topological‐defect‐featured order evolution of liquid crystals

Responsive Materials, EarlyView.
This review provides a comprehensive introduction to the recent advances in the topological‐defect‐featured order evolution of liquid crystal (LCs), including the stimulus‐driven dynamics of defects in nematic LCs, topological defect morphological transformation during phase transitions, advanced strategies for regulating and applications of ...
Jin‐Bing Wu, Daoxing Luo, Zhenghao Guo, Yan‐Qing Lu, Wei Hu   +4 more
wiley   +1 more source

Cosmological influence of super-Hubble perturbations

, 2005
The existence of cosmological perturbations of wavelength larger than the Hubble radius is a generic prediction of the inflationary paradigm. We provide the derivation beyond perturbation theory of a conserved quantity which generalizes the linear ...
Kolb, Edward W., Matarrese, Sabino, Notari, Alessio, Riotto, Antonio   +3 more
core   +1 more source

A time varying speed of light as a solution to cosmological puzzles [PDF]

, 1999
We consider the cosmological implications of light travelling faster in the early Universe. We propose a prescription for deriving corrections to the cosmological evolution equations while the speed of light $c$ is changing. We then show how the horizon,
A. Albrecht, A. Guth, A. Guth, A. Linde, A. Linde, A. Starobinsky, A. Vilenkin, Andreas Albrecht, C. M. Will, H. Kodama, J. Bardeen, J. Barrow, J. Barrow, J. D. Bekenstein, J. D. Bekenstein, J. E. Solheim, J. Levin, J. Levin, J. Levin, J. Moffat, J. Moffat, J. Peebles, João Magueijo, P. Steinhardt, R. H. Dicke, S. W. Hawking, T. Kibble, V. Mukhanov, V. Mukhanov, W. A. Baum, Y. Hu   +30 more
core   +2 more sources

Integrating multimodal data and machine learning for entrepreneurship research

Strategic Entrepreneurship Journal, EarlyView.
Abstract Research Summary Extant research in neuroscience suggests that human perception is multimodal in nature—we model the world integrating diverse data sources such as sound, images, taste, and smell. Working in a dynamic environment, entrepreneurs are expected to draw on multimodal inputs in their decision making.
Yash Raj Shrestha, Vivianna Fang He
wiley   +1 more source

Cosmological Perturbations in Phantom Dark Energy Models

Universe, 2017
The ΛCDM paradigm, characterised by a constant equation of state w = − 1 for dark energy, is the model that better fits observations. However, the same observations strongly support the possibility of a dark energy content where the corresponding
Imanol Albarran, Mariam Bouhmadi-López, João Morais   +2 more
doaj   +1 more source

Irregular universe in the Nieh-Yan modified teleparallel gravity

Physics Letters B, 2023
The Nieh-Yan modified teleparallel gravity is a model which modifies the general relativity equivalent teleparallel gravity by a coupling between the Nieh-Yan density and an axion-like field.
Mingzhe Li, Haomin Rao
doaj   +1 more source