Results 121 to 130 of about 2,866,947 (383)

The velocity of gravitational waves [PDF]

Physics Letters A, 1999
We examine the propagation of gravitational waves in the new field theory of gravitation recently proposed by Novello-De Lorenci-Luciane (NDL). This examination is done on a solvable case corresponding to a spherically symmetric static configuration. We show that in NDL theory the velocity of gravitational waves is lower than light velocity.
Novello, M., De Lorenci, V. A., de Freitas, Luciane R., Aguiar, O. D.   +3 more
openaire   +2 more sources

Recent Advances in Variable‐Stiffness Robotic Systems Enabled by Phase‐Change Materials

Advanced Robotics Research, EarlyView.
Phase‐change materials (PCMs), such as shape memory alloys, hydrogels, shape memory polymers, liquid crystal elastomers, and low‐melting‐point alloys, are driving advancements in stiffness‐tunable robotic systems across a wide range of applications. This review highlights recent progress in PCM‐enabled robotics, focusing on their underlying mechanisms,
Sukrit Gaira, Liao Wu, Ming Li, Priyank Kumar, Xiaopeng Li, Shi‐Yang Tang   +5 more
wiley   +1 more source

Spin gravitational resonance and graviton detection

, 2016
We develop a gravitational analogue of spin magnetic resonance, called spin gravitational resonance, whereby a gravitational wave interacts with a magnetic field to produce a spin transition. In particular, an external magnetic field separates the energy
Quach, James Q.
core   +1 more source

Cosmological Gravitational Wave in a Gravity with Quadratic Order Curvature Couplings [PDF]

, 1996
We present a set of equations describing the cosmological gravitational wave in a gravity theory with quadratic order gravitational coupling terms which naturally arise in quantum correction procedures. It is known that the gravitational wave equation in
A. A. Starobinsky, A. S. Eddington, B. S. DeWitt, B. Whitt, C. W. Misner, E. Alvarez, E. M. Lifshitz, G. ’t Hooft, Hyerim Noh, I. Antoniadis, I. L. Shapiro, J. D. Barrow, J. Hwang, J. Hwang, J. Hwang, J. Hwang, Jai-chan Hwang, K. S. Stelle, L. Amendola, L. H. Ford, L. P. Grishchuk, M. Green, M. H. Goroff, N. D. Birrell, R. Sachs, V. F. Mukhanov, W. Pauli   +26 more
core   +2 more sources

The Optimization of Frequency Distribution Based on Genetic Algorithm for Space Gravitational Wave Observatories

Applied Sciences
The three spacecraft of the space gravitational wave antenna employ heterodyne interferometry to mitigate the effects of Doppler shift. Constrained by laser relative intensity noise (RIN) and the sampling frequency constraints of phase readout circuits ...
Lixiao Zeng, Haojie Li, Weilai Yao, Jianyu Wang, Xindong Liang   +4 more
doaj   +1 more source

• On the Polarization of Gravitational Waves

, 2012
Physical properties of gravitational waves, belonging to the larger class of exact solutions of Einstein field equations which are invariant for a non-Abelian two-dimensional Lie algebra of Killing fields, are described. It is shown that in the would be quantum theory of gravity they correspond to spin $−1$ massless particles.
openaire   +3 more sources

Gravitational wave heating

Physical Review D
It was shown in previous work that when a gravitational wave (GW) passes through a viscous shell of matter the magnitude of the GW will be damped and there are astrohysical circumstances in which the damping is almost complete. The energy transfer from the GWs to the fluid will increase its temperature.
Vishnu Kakkat, Nigel T. Bishop, Amos S. Kubeka   +2 more
openaire   +2 more sources

Multiobjective Codesign Optimization of a Planar Pneumatic Artificial Muscle‐Based Snake‐Like Robot for Enhanced Agility and Energy Efficiency

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

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

Electromagnetic follow-up of gravitational wave transient signal candidates

, 2012
Pioneering efforts aiming at the development of multi-messenger gravitational wave and electromagnetic astronomy have been made. An electromagnetic observation follow-up program of candidate gravitational wave events has been performed (Dec 17 2009 to ...
Abadie J, Abadie J, Abadie J, Abadie J, Abadie J, Abbott B P, Acernese F, Buskulic D for the LVC, Fairhurst S, Gehrels N, Kanner J, Kelley, Marica Branchesi, Nuttall L K, Perley R A, Richmond M, Searle A C, White D J   +17 more
core   +1 more source