Results 11 to 20 of about 549,979 (269)
Collapse of vacuum bubbles in a vacuum [PDF]
Physical Review D, 2011 Motivated by the discovery of a plenitude of metastable vacua in a string landscape and the possibility of rapid tunneling between these vacua, we revisit the dynamics of a false vacuum bubble in a background de Sitter spacetime. We find that there exists a large parameter space that allows the bubble to collapse into a black hole or to form a wormhole.
Ng, Kin-Wang, Wang, Shang-Yung
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The Unruh Vacuum and the “In-Vacuum” in Reissner-Nordström Spacetime
Universe, 2023 The Unruh vacuum is widely used as a quantum state to describe black hole evaporation since, near the horizon, it reproduces the physical state of a quantum field, the so-called “in-vacuum”, in the case where a black hole is formed by gravitational collapse.
Balbinot R., Fabbri A.
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Vacuum energy and θ-vacuum [PDF]
Nuclear Physics B - Proceedings Supplements, 2004 The highly non-trivial structure of the $θ$--vacuum encodes many of the fundamental properties of gauge theories. In particular, the response of the vacuum to the $θ$--term perturbation is sensitive to the existence of confinement, chiral symmetry breaking, etc. We analyze the dependence of the vacuum energy density on theta around two special values, $
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HYDRODYNAMICS OF THE VACUUM [PDF]
International Journal of Modern Physics A, 2006 Hydrodynamics is the appropriate "effective theory" for describing any fluid medium at sufficiently long length scales. This paper treats the vacuum as such a medium and derives the corresponding hydrodynamic equations. Unlike a normal medium the vacuum has no linear sound-wave regime; disturbances always "propagate" nonlinearly.
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The vacuum-vacuum amplitude and Bogoliubov coefficients [PDF]
Journal of Experimental and Theoretical Physics, 2003 Even if the electromagnetic field does not create pairs, virtual pairs lead to the appearance of a phase in vacuum-vacuum amplitude. This makes it necessary to distinguish the in- and out-solutions even when it is commonly assumed that there is only one complete set of solutions as, for example, in the case of a constant magnetic field.
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Applied Sciences, 2022 The pulsed laser has gradually become the standard method of studying the single-event effects of micro-nano devices, and it is a powerful supplement to heavy ion experiments on single-event effects.
Heng An +6 more
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Communications in Mathematical Physics, 1992 The spacelike asymptotic structure of physical states in local quantum theory is analysed. It is shown that this structure can be described in terms of a vacuum state if the theory satisfies a condition of timelike asymptotic abelianess. Theories which violate this condition can have an involved asymptotic vacuum structure as is illustrated by a simple
Buchholz, Detlev, Wanzenberg, Rainer
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UV-LIGA Microfabrication for 1.1 THz Staggered Double-Grating Slow-Wave Structures
MicromachinesIn this paper, a 1.1 THz staggered double-grating slow-wave structure (SWS) for traveling wave tubes (TWTs) is fabricated using UV-LIGA processes based on RD-2150 photoresist.
Qi Jiang +4 more
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Research on the Withstand Voltage Properties of Cr/Mn-Doped Al2O3 Ceramics in Vacuum
Electronic MaterialsAl2O3 ceramics are widely used in vacuum electronic devices. However, surface flashover in a vacuum during the application of high voltage significantly influences their reliability and restricts the development of vacuum electronic devices.
Dandan Feng +5 more
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