Results 91 to 100 of about 207,815 (342)
A VLBI Proper Motion Analysis of the Recoiling Supermassive Black Hole Candidate Mrk 1018
The Astrophysical Journal, 2023 Mrk 1018 is a nearby changing-look active galactic nucleus (AGN) that has oscillated between spectral Type 1.9 and Type 1 over a period of 40 yr. Recently, a recoiling supermassive black hole (rSMBH) scenario has been proposed to explain the spectral and
Gregory Walsh +2 more
doaj +1 more source
Advanced Robotics Research, EarlyView.A codesign multiobjective optimization framework was developed to enhance the morphology and controller of a snake‐like robot driven by artificial muscles. It improved planar locomotion, agility, and power efficiency. The approach optimized link geometry and controller gains, revealing that shorter muscles near joints and longer linkages maximize ...
Ayla Valles, Mahdi Haghshenas‐Jaryani
wiley +1 more source
Constraining the EdGB theory with extreme mass-ratio inspirals
European Physical Journal C: Particles and FieldsThe Einstein-dilaton-Gauss–Bonnet (EdGB) theory is a modified theory of gravity which include a scalar field to couple with the higher order curvature terms.
Jing Tan +3 more
doaj +1 more source
Observation of gravitational waves by light polarization
European Physical Journal C: Particles and Fields, 2021 We provide analysis to determine the effects of gravitational waves on electromagnetic waves, using perturbation theory in general relativity. Our analysis is performed in a completely covariant manner without invoking any coordinates.
Chan Park, Dong-Hoon Kim
doaj +1 more source
High frequency sources of gravitational waves
, 2003 Sources of high frequency gravitational waves are reviewed. Gravitational collapse, rotational instabilities and oscillations of the remnant compact objects are potentially important sources of gravitational waves.
Andersson +21 more
core +2 more sources
Quintessence and gravitational waves
Physical Review D, 2000 We investigate some aspects of quintessence models with a non-minimally coupled scalar field and in particular we show that it can behave as a component of matter with $-3 \lesssim P/\rho \lesssim 0$. We study the properties of gravitational waves in this class of models and discuss their energy spectrum and the cosmic microwave background anisotropies
Riazuelo, Alain, Uzan, Jean-Philippe
openaire +2 more sources
Soft Robotic Snake with Tunable Undulatory Gait for Efficient Underwater Locomotion
Advanced Robotics Research, EarlyView.This study designs an underwater soft snake robot using 3D‐printed soft actuators, controlled by specific signals to generate sinusoidal undulation. Results show a positive correlation between speed and swing amplitude, with optimal performance at 2/3π phase offset, PLA tail, 1.2 voltage growth rate, and 6s undulation period achieving a maximum speed ...
Huichen Ma, Junjie Zhou, Raye Yeow
wiley +1 more source
Analytical and Numerical Analysis of Circumbinary Disk Dynamics. I. Coplanar Systems
The Astrophysical JournalWe present an analytical and numerical study of a system composed of a stellar binary pair and a massless, locally isothermal viscous accretion disk that is coplanar to the binary orbital plane.
Siddharth Mahesh +2 more
doaj +1 more source
Sistemnì Doslìdženâ ta Informacìjnì Tehnologìï, 2019 In this research the energy density was calculated and the spin momentum density of Moon’s gravitational waves in the rectilinear coordinates’ system of Moon’s gravity and Earth’s global temperature. At first, we assumed an action principle that combines
Yoshio Matsuki, Petro I. Bidyuk
doaj +1 more source
No evidence for the blue-tilted power spectrum of relic gravitational waves
, 2015 In this paper, we constrain the tilt of the power spectrum of relic gravitational waves by combining the data from BICEP2/Keck array and Planck (BKP) and the Laser Interferometer Gravitational-Waves Observatory (LIGO).
Huang, Qing-Guo, Wang, Sai
core +1 more source