Results 61 to 70 of about 1,922 (181)

Exploring Dark Photon Production and Kinetic Mixing Constraints in Heavy‐Ion Collisions

Astronomische Nachrichten, Volume 346, Issue 3-4, March-May 2025.
ABSTRACT Vector U‐bosons, often referred to as “dark photons,” are potential candidates for mediating dark matter interactions. In this study, we outline a procedure to derive theoretical constraints on the upper bound of the kinetic mixing parameter ϵ2MU$$ {\upvarepsilon}^2\left({M}_U\right) $$ using dilepton data from heavy‐ion from SIS to RHIC ...
Adrian William Romero Jorge, Elena Bratkovskaya, Taesoo Song, Laura Sagunski   +3 more
wiley   +1 more source

Stochastic Quantum Mechanics in Curved Spaces: Application to Schwarzschild Black Holes

Astronomische Nachrichten, Volume 346, Issue 3-4, March-May 2025.
ABSTRACT In this work, we start from the hypothesis that the universe lives in a Gravitational Wave Background (GWB). From this hypothesis, it follows that space–time is not locally flat because we have to take into account the fluctuations of the GWB in space–time. This implies that sufficiently small particles will feel these oscillations, preventing
Juan S. Jerez‐Rodriguez, Tonatiuh Matos   +1 more
wiley   +1 more source

JWST Imaging of the Closest Globular Clusters—V. The White Dwarfs Cooling Sequence of M4

Astronomische Nachrichten, Volume 346, Issue 2, February 2025.
ABSTRACT We combine infrared (IR) observations collected by the James Webb Space Telescope with optical deep images by the Hubble Space Telescope taken ~20 years earlier to compute proper‐motion membership for the globular cluster (GC) M4 (NGC 6121) along its entire white dwarf (WD) cooling sequence (CS).
Luigi R. Bedin, Mattia Libralato, Maurizio Salaris, Domenico Nardiello, Michele Scalco, Massimo Griggio, Jay Anderson, Pierre Bergeron, Andrea Bellini, Roman Gerasimov, Adam J. Burgasser, Daniel Apai   +11 more
wiley   +1 more source

Revisiting Variable Stars Near Globular Clusters South of −29° Declination

Astronomische Nachrichten, Volume 346, Issue 2, February 2025.
ABSTRACT We review an often‐cited but seldom‐accessed catalogue by Fourcade and Laborde (1966) of 785 variable stars near 47 southern Galactic globular clusters, and recover the locations of 85 stars that were not incorporated into subsequent variable star catalogues and hence have become “lost” to the literature.
Andrew C. Layden, Julia Evangelista, Sakshi Gupta, Mithilesh Mittameda, Eva Mulloy, Sohan I. Muslim, Tiyinoluwa Olushola‐Alao, Akul Rishi   +7 more
wiley   +1 more source

Riemann Solitons on Homogeneous Siklos Spacetimes

Journal of Mathematics, Volume 2025, Issue 1, 2025.
In this paper, we investigate the properties of Riemann solitons on homogeneous Siklos spacetimes. Siklos spacetimes, which are special solutions to Einstein’s equations with a wave‐like potential, provide a suitable setting for studying the geometric properties of Riemann solitons.
Mehdi Jafari, Amirhesam Zaeim, Adele Alemahdi, Erhan Güler   +3 more
wiley   +1 more source

The effect of vorticity on the feeding of a freshwater grazer

Limnology and Oceanography, Volume 69, Issue S1, Page S54-S66, December 2024.
Abstract The transfer of energy through zooplankton grazing on phytoplankton is one of the most important interactions in aquatic ecosystems, yet the role of hydrodynamic forces is not fully understood. Factors that influence these interactions include algal size and shape and the interactions between grazer and alga dictated by hydrodynamic forces ...
Luc Goulet, Warren Joseph Sproule Currie, Josef Daniel Ackerman   +2 more
wiley   +1 more source

A Unified Empirical Timescale for Galaxy Dynamics from Kinematic Scale Competition [PDF]

Lachlan McGill
  +4 more sources

Kinematic Constraints on Evolutionary Scenarios for Blue Compact Dwarf Galaxies. I. Neutral Gas Dynamics [PDF]

, 2001
Liese van Zee, John J. Salzer, Evan D. Skillman   +2 more
openalex   +1 more source

Mapping galaxy components with kinematics : dynamical models with stellar and gaseous kinematics

, 2020
Mapping galaxy mass distribution is an important means of understanding galaxy morphology and the nature of dark matter haloes, and therefore build up our knowledge of galaxy formation and evolution. Analytical and numerical dynamical models are powerful methods to model galaxy mass distributions based on galaxy stellar kinematics, and are strengthened
openaire   +2 more sources

Ionised gas kinematics and dynamical masses of z ≳ 6 galaxies from JADES/NIRSpec high-resolution spectroscopy

Astronomy & Astrophysics
We explore the kinematic gas properties of six 5.5 < z < 7.4 galaxies in the JWST Advanced Deep Extragalactic Survey (JADES), using high-resolution JWST/NIRSpec multi-object spectroscopy of the rest-frame optical emission lines [OIII] and Hα. The objects are small and of low stellar mass (∼1 kpc; M* ∼ 107 − 9 M⊙), less massive than any galaxy ...
de Graaff, Anna, Rix, Hans-Walter, Carniani, Stefano, Suess, Katherine, Charlot, Stéphane, Curtis-Lake, Emma, Arribas, Santiago, Baker, William, Boyett, Kristan, Bunker, Andrew, Cameron, Alex, Chevallard, Jacopo, Curti, Mirko, Eisenstein, Daniel, Franx, Marijn, Hainline, Kevin, Hausen, Ryan, Ji, Zhiyuan, Johnson, Benjamin, Jones, Gareth, Maiolino, Roberto, Maseda, Michael, Nelson, Erica, Parlanti, Eleonora, Rawle, Tim, Robertson, Brant, Tacchella, Sandro, Übler, Hannah, Williams, Christina, Willmer, Christopher, Willott, Chris   +30 more
openaire   +3 more sources