Results 101 to 110 of about 59,420 (206)

Overview of the MMT 60‐Day GEER Experiment on Geologic Samples at Venus Surface Conditions

Journal of Geophysical Research: Planets, Volume 130, Issue 12, December 2025.
Abstract Laboratory experiments on the behavior of rock and mineral samples under Venus conditions can yield a better understanding of gas‐solid chemical weathering on the Venus surface. The Glenn Extreme Environments Rig (GEER) vessel can maintain Venus surface temperature, pressure and a nine‐gas atmosphere for months.
Martha S. Gilmore, Alison R. Santos, Jeffrey Balcerski, Laura B. Breitenfeld, M. Darby Dyar, Daniel Gerges, Joern Helbert, Ian Henry, Noam Izenberg, Jennifer M. Jackson, Tibor Kremic, Dorothy Lukco, Molly McCanta, Craig Motil, Kyle Phillips, Sara T. Port, Joseph Rymut, Maximilian C. Scardelletti, Mark Sprouse, Mikhail Yu. Zolotov   +19 more
wiley   +1 more source

Axial gravitational normal modes of uniform density star in Anti-de Sitter spacetime

Nuclear Physics B
The article studies the dynamical behavior of axial gravitational perturbations of homogeneous stars in Anti-de Sitter spacetime. Because the radial coordinate r transforms into the tortoise coordinate y=y(r), obeying y(r=0)=0 and y(r ...
Kai Lin, Alan B. Pavan, Amilcar Rabelo De Queiroz, Elcio Abdalla   +3 more
doaj   +1 more source

WKB approximation for inflationary cosmological perturbations [PDF]

, 2003
Jérôme Martin, Dominik J. Schwarz
openalex   +1 more source

Trade Networks and Consumer Practices in Amedeka, Ghana: Negotiating “Nkudzedze” From the Late 19th to Mid‐20th Centuries

American Anthropologist, Volume 127, Issue 4, Page 757-776, December 2025.
ABSTRACT This paper examines local taste practices in the era of “legitimate trade” when the trade in botanical (e.g., palm oil, palm kernel oil, and cocoa) and nonbotanical (e.g., ivory, textiles) commodities replaced the trade in enslaved Africans. Following the 1807 British abolition of the Atlantic trade in enslaved people, the locus of the trade ...
Dela Kuma
wiley   +1 more source

TASI Lectures on Cosmological Perturbations

, 2013
We present a self-contained summary of the theory of linear cosmological perturbations. We emphasize the effect of the six parameters of the minimal cosmological model, first, on the spectrum of Cosmic Microwave Background temperature anisotropies, and ...
Lesgourgues, Julien
core   +1 more source

A simplified structure for the second order cosmological perturbation equations [PDF]

, 2012
Claes Uggla, John Wainwright, Claes Uggla, John Wainwright   +3 more
openalex   +1 more source

The Dialectic of Backsliding: Thinking with Habermas About Democratic Progress and Regression

European Journal of Philosophy, Volume 33, Issue 4, Page 1274-1290, December 2025.
Abstract There is widespread agreement that we are living in an age of “democratic backsliding,” in which a growing number of formally democratic countries are falling behind previously achieved levels of democratization. But on what grounds can we claim that one level of democratic development is “higher” or “lower” than another?
Fabio Wolkenstein
wiley   +1 more source

Local Limit of Nonlocal Gravity: Cosmological Perturbations

The Astrophysical Journal
We explore the cosmological implications of the local limit of nonlocal gravity, which is a classical generalization of Einstein’s theory of gravitation within the framework of teleparallelism.
Javad Tabatabaei, Abdolali Banihashemi, Shant Baghram, Bahram Mashhoon   +3 more
doaj   +1 more source

Curvature and topology dependency of the cosmological spectra

Results in Physics, 2019
In this article we investigate dependency of two important cosmological random fields defined on spatial slices of the FLRW universe and their spectra on the geometry and topology of the background universe.
Ali A. Asgari, Amir H. Abbassi, Jafar Khodagholizadeh   +2 more
doaj   +1 more source

Doubly-gauge-invariant formalism of brane-world cosmological perturbations [PDF]

, 2002
Shinji Mukohyama
openalex   +1 more source