Results 61 to 70 of about 63,236 (296)
DeWitt Boundary Condition in One-Loop Quantum Cosmology
Universe, 2023 DeWitt’s suggestion that the wave function of the universe should vanish at the classical Big Bang singularity is considered here within the framework of one-loop quantum cosmology.
Giampiero Esposito
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The nature of gravitational singularities
, 2004 The nature of gravitational singularities, long mysterious, has now become clear through a combination of mathematical and numerical analysis. As the singularity is approached, the time derivative terms in the field equations dominate, and the ...
Berger B., DAVID GARFINKLE, Uggla C.
core +1 more source
Recent Advances in Collective Behaviors of Micro/Nanomotor Swarms
Advanced Materials, EarlyView.This review describes the driving forces behind collective motion, explores the self‐organization of micro/nano swarms across zero‐dimensional (0D), one‐dimensional (1D), two‐dimensional (2D), and three‐dimensional (3D) spaces, and highlights their potential in drug delivery, environmental monitoring, and smart devices.
Siwen Sun +4 more
wiley +1 more source
Enhanced Approaches to Gravitational Lensing: A Regular Charged Black Hole in Weak Field Limit
Spektra: Jurnal Fisika dan AplikasinyaGravitational lensing, an integral aspect of general relativity, profoundly impacts our understanding of black holes (BH’s). The presence of a centered singularity resulting from gravitational collapse is a fundamental characteristic of a BH. Nonetheless,
H. M. U. Din, H. S. Ramadhan
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Autonomous Spatiotemporal Regulation of Reversible Hydrogel Actuators by Chemical Reaction Networks
Advanced Materials, EarlyView.Hydrogel actuators with reversible response to thiols are developed using reversible binding of thiols to Michael acceptors. Autonomous spatiotemporal regulation of reversible movement of these hydrogels is achieved using thiol‐based chemical reaction networks containing both positive and negative feedback.
Fan Liao +3 more
wiley +1 more source
Formation and evaporation of an electrically charged black hole in conformal gravity
European Physical Journal C: Particles and Fields, 2018 Extending previous work on the formation and the evaporation of black holes in conformal gravity, in the present paper we study the gravitational collapse of a spherically symmetric and electrically charged thin shell of radiation.
Cosimo Bambi +3 more
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Aqueously Upcycled Lignin with Emergent Tribonegativity for Skin‐Integrated Triboelectronics
Advanced Materials, EarlyView.Aqueously upcycled lignin is transformed into a printable ink that self‐assembles into a nanotextured surface during printing with the highest reported biopolymer‐based tribonegativity. The resulting skin‐integrated triboelectric sensor enables high‐fidelity cardiovascular monitoring and objective mental workload classification, demonstrating a ...
Robert Ccorahua‐Santo +3 more
wiley +1 more source
Advanced Materials, EarlyView.Residual magnetization induces pronounced mechanical anisotropy in ultra‐soft magnetorheological elastomers, shaping deformation and actuation even without external magnetic fields. This study introduces a computational‐experimental framework integrating magneto‐mechanical coupling into topology optimization for designing soft magnetic actuators with ...
Carlos Perez‐Garcia +3 more
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Particle motion and tidal force in a non-vacuum-charged naked singularity
European Physical Journal C: Particles and FieldsWe investigate the gravitational field of a charged, non-vacuum, non-rotating, spherically symmetric body of mass M assuming a static solution to the Einstein–Maxwell field equations.
Divyesh P. Viththani +3 more
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Gravitational perfect fluid collapse in Gauss–Bonnet gravity
European Physical Journal C: Particles and Fields, 2017 The Einstein Gauss–Bonnet theory of gravity is the low-energy limit of heterotic super-symmetric string theory. This paper deals with gravitational collapse of a perfect fluid in Einstein–Gauss–Bonnet gravity by considering the Lemaitre–Tolman–Bondi ...
G. Abbas, M. Tahir
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