Results 91 to 100 of about 298,499 (308)

Varying fine-structure constant cosmography

Physics Letters B, 2022
Cosmography is a phenomenological and relatively model-independent approach to cosmology, where physical quantities are expanded as a Taylor series in the cosmological redshift, or in related variables.
C.J.A.P. Martins, F.P.S.A. Ferreira, P.V. Marto   +2 more
doaj   +1 more source

Branon dark matter: an introduction

, 2004
This is a brief introduction to branon physics and its role in the dark matter problem. We pay special attention to the phenomenological consequences, both in high-energy particle physics experiments and in astrophysical and cosmological observations ...
Cembranos, J. A. R., Dobado, A., Maroto, A. L.   +2 more
core   +1 more source

The DEEP2 Galaxy Redshift Survey: The Voronoi-Delaunay Method Catalog of Galaxy Groups [PDF]

, 2012
We present a public catalog of galaxy groups constructed from the spectroscopic sample of galaxies in the fourth data release from the Deep Extragalactic Evolutionary Probe 2 (DEEP2) Galaxy Redshift Survey, including the Extended Groth Strip (EGS).
Aaron A. Dutton, Alison L. Coil, Andrew C. Phillips, Benjamin J. Weiner, Berlind, Brian F. Gerke, Christopher N. A. Willmer, Coil, Coil, Coil, Coil, Conroy, David C. Koo, David J. Rosario, Davis, Davis, Evrard, Faber, Fang, Gerke, Gladders, Hao, Jeffrey A. Newman, Kai Noeske, Kenney, Klypin, Knobel, Koester, Li, Lihwai Lin, Lilly, Liu, Ma, Marc Davis, Marinoni, Michael C. Cooper, Miller, Newman, Newman, Nicholas Konidaris, Nolthenius, Puragra Guhathakurta, Renbin Yan, S. M. Faber, Soares-Santos, Tinker, Willmer, Yan, Zheng, Zheng   +49 more
core   +3 more sources

The effect of early diagenetic processes on the quantification of fossil micrometeorite abundance and flux in the geological record

Meteoritics &Planetary Science, EarlyView.
Abstract Fossil micrometeorites (MMs) recovered from lithified sedimentary rocks, particularly iron‐rich (I‐type) cosmic spherules (CSs) provide valuable insights into past dust‐forming events. Their abundances, when combined with estimates of local sedimentation rates can be used to reconstruct the flux of extraterrestrial dust.
Isabelle S. Mattia, Matthew J. Genge, Martin D. Suttle   +2 more
wiley   +1 more source

Cosmology with X-ray Cluster Baryons [PDF]

, 2006
X-ray cluster measurements interpreted with a universal baryon/gas mass fraction can theoretically serve as a cosmological distance probe. We examine issues of cosmological sensitivity for current (e.g.
, , , , Branch D Perlmutter S Baron E Nugent P, Eric V Linder, Ferramacho L D Blanchard A, Gastaldello F, Hallman E J Motl P M Burns J O Norman M L, Linder E V, Loeb A, Nagai D Vikhlinin A Kravtsov A V, Rapetti D Allen S W Con X Facility Science Team, Sasaki S   +13 more
core   +3 more sources

ASTROPHYSICAL POLARIMETRY OF COSMOLOGICAL SOURCES [PDF]

CPT and Lorentz Symmetry, 2002
Kostelecky and Mewes have recently shown that sensitive constraints can be placed on some aspects of Lorentz symmetry violation using certain astronomical data on high-redshift sources. Here, I introduce that data in its astronomical context, making it clear that these data are robust and accurate for their purpose.
openaire   +2 more sources

Small‐scale elemental abundance variations in Ryugu particles from touchdown 1

Meteoritics &Planetary Science, EarlyView.
Abstract Ryugu materials closely resemble CI chondrites' mineralogical, chemical, and isotopic compositions; yet minor but resolvable differences in certain elemental abundances are evident. In this study, the bulk chemical compositions of eight individual Ryugu particles (1.5–4.3 mg) from the first touchdown site (TD1) were determined using triple ...
Karina López García, Tetsuya Yokoyama, Ikshu Gautam, Makiko K. Haba, Tsuyoshi Iizuka, Nao Nakanishi, Ryota Fukai   +6 more
wiley   +1 more source

Evolution of the fine-structure constant in runaway dilaton models

Physics Letters B, 2015
We study the detailed evolution of the fine-structure constant α in the string-inspired runaway dilaton class of models of Damour, Piazza and Veneziano.
C.J.A.P. Martins, P.E. Vielzeuf, M. Martinelli, E. Calabrese, S. Pandolfi   +4 more
doaj   +1 more source

Initial study of regolith exposure ages and burial conditions on Ryugu: Cosmogenic nuclides score in two touchdowns

Meteoritics &Planetary Science, EarlyView.
Abstract Surface processes on the asteroid Ryugu have been investigated using cosmic‐ray‐produced radionuclides, 10Be, 26Al, and 36Cl, and stable noble gases, on eight samples returned by the Hayabusa2 spacecraft. The 10Be and 26Al along with 21Ne measurements indicate that the two Chamber A samples A0105 collected during the first touchdown (TD) were ...
Kunihiko Nishiizumi, Keisuke Nagao, Marc W. Caffee, Ryuji Okazaki, Jozef Masarik, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Hiroshi Naraoka, Hikaru Yabuta, Kanako Sakamoto, Kasumi Yogata, Toru Yada, Shogo Tachibana, Sei‐ichiro Watanabe, Yuichi Tsuda, Masanao Abe, Kazuya Kumagai, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Hirotaka Sawada, Satoshi Tanaka, Tomohiro Usui, Koji Wada, Hajime Yano, Makoto Yoshikawa, Hayabusa2 Initial Analysis Volatile Team   +30 more
wiley   +1 more source

Petrography and mineral chemistry of Northeast Africa 053—A remnant of Martian crystal mush

Meteoritics &Planetary Science, EarlyView.
Abstract In Earth's igneous systems, crystal mushes, crystal‐rich frameworks permeated by silicate melt, represent a common and fundamental stage in the evolution of magma bodies. However, whether crystal mushes occur within Martian igneous systems and play a comparable role is unknown. Here, we present a comprehensive petrography and mineral chemistry
Xhonatan Shehaj, Eleonora Ammannito, Giovanni Pratesi   +2 more
wiley   +1 more source