Results 11 to 20 of about 18,585 (259)
Journal of Cosmology and Astroparticle Physics, 2020 23 pages, 6 main figures, comments are ...
Ilyas, Amara +4 more
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Spectrum of Cuscuton bounce [PDF]
Journal of Cosmology and Astroparticle Physics, 2021 Abstract It has been recently shown that a cosmological bounce model based on Cuscuton gravity does not have any ghosts or curvature instabilities. We explore whether Cuscuton bounce can provide an alternative to inflation for generating near scale-invariant scalar perturbations.
Kim, J. Leo, Geshnizjani, Ghazal
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Drop impact dynamic and directional transport on dragonfly wing surface
Friction, 2023 The ability of dragonflies to fly in the rain without being wetted by raindrops has motivated researchers to investigate the impact behavior of a drop on the superhydrophobic wings of dragonflies.
Jing Xu +4 more
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The Effect of the Width of an Aluminum Plate on a Bouncing Steel Ball [PDF]
International Scholastic Journal of Science, 2013 The effect of the distance between clamping supports of an aluminum alloy plate on the coefficient of restitution of a bouncing steel ball was investigated. The plate was supported on two wooden blocks with a meter stick secured on either side.
Christine Hathaway, Hanh Nguyen
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Classical and Quantum Gravity, 2004 14 pages, Revtex; (v2) minor revisions; (v3) reference ...
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Journal of Cosmology and Astroparticle Physics, 2018 In general relativity producing a regular bounce entails violation of Null Energy Condition for a dynamical source in the model. That generically indicates existence of ghosts or other instabilities. However, in cuscuton modification of gravity, the correspondence between a background bounce and violation of Null Energy Condition for dynamical sources ...
Boruah, Supranta S. +3 more
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Investigation into the Trampoline Dynamic Characteristics and Analysis of Double Bounce Vibrations
Sensors, 2022 Double bounce is an unusual and potentially very hazardous phenomenon that most trampoline users may have experienced, yet few would have really understood how and why it occurs.
David Eager +5 more
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International Journal of Modern Physics A, 2009 We investigate if theories yielding bouncing cosmological models also generate wormhole solutions. We show that two of them present sensible traversable static wormhole solutions, while for the third possibility such solutions are absent.
Pinto-Neto, N. +2 more
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Journal of Cosmology and Astroparticle Physics, 2007 By demanding that a bounce is nonsingular and that perturbations are well-behaved at all times, we narrow the scope of possible models with one degree of freedom that can describe a bounce in the absence of spatial curvature. We compute the general properties of the transfer matrix of perturbations through the bounce, and show that spectral distortions
Abramo, L. Raul, Peter, Patrick
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Journal of Cosmology and Astroparticle Physics, 2011 We present a wide class of models which realise a bounce in a spatially flat Friedmann universe in standard General Relativity. The key ingredient of the theories we consider is a noncanonical, minimally coupled scalar field belonging to the class of theories with Kinetic Gravity Braiding / Galileon-like self-couplings.
Easson, Damien A. +2 more
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