منابع مشابه
Cosmic String Created from Vacuum Fluctuation
The possibility of the cosmic string creation by the vacuum fluctuations of quantum fields in the self-consistent semiclassical theory of gravity is discussed. We use the approximate method for obtaining vacuum expectation value of the renormalized stress-energy tensor of conformally invariant quantum fields in static cylindrically symmetric spacetimes. We have obtained the particular solutions...
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We show that the bubbles S ×S2can be created from vacuum fluctuation in certain De Sitter universe, so the space-time foam-like structure might really be constructed from bubbles of S × S in the very early inflating phase of our universe. But whether such foam-like structure persisted during the later evolution of the universe is a problem unsolved now. PACS: 04.20.Gz, 04.60.Ds Typeset using RE...
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A luminescence pulse is observed from laser-created bubbles in pressurized liquid nitrogen and argon, occurring at the first collapse point of the bubble motion. The duration of the light pulse depends linearly on the bubble size, ranging from 200 ns to 1 micros for bubbles with maximum diameters between 0.2 and 1 mm. The spectrum of the light consists entirely of atomic lines, which surprising...
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Histotripsy is a therapy that focuses short-duration, high-amplitude pulses of ultrasound to incite a localized cavitation cloud that mechanically breaks down tissue. To investigate the mechanism of cloud formation, high-speed photography was used to observe clouds generated during single histotripsy pulses. Pulses of 5-20 cycles duration were applied to a transparent tissue phantom by a 1-MHz ...
متن کاملTopological vacuum bubbles by anyon braiding
According to a basic rule of fermionic and bosonic many-body physics, known as the linked cluster theorem, physical observables are not affected by vacuum bubbles, which represent virtual particles created from vacuum and self-annihilating without interacting with real particles. Here we show that this conventional knowledge must be revised for anyons, quasiparticles that obey fractional exchan...
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ژورنال
عنوان ژورنال: Chinese Physics Letters
سال: 2001
ISSN: 0256-307X,1741-3540
DOI: 10.1088/0256-307x/18/8/303