Testing for multiple bubbles in the copper price: Periodically collapsing behavior

Testing for Periodically Collapsing Bubbles: an Generalized Sup Adf Test

Identifying explosive bubbles under the influence of their periodically collapsing property has long been a concern in bubble testing literature. In this paper, we argue that the sup Augmented Dickey-Fuller (ADF) test (Phillips, Wu and Yu, 2009), which implements a right-tail ADF test and a sup test on a forward expanding sample sequence, is sensitive to the sample starting point when there are...

a simple procedure for detecting periodically collapsing rational bubbles ¤

Jets from Collapsing Bubbles

When an asymmetric bubble collapses it generally produces a well defined high velocity jet. This is remarkable because one might expect such a collapse to produce a complex or chaotic flow rather than an ordered one. I present a dimensional argument for the ubiquity of jets from collapsing bubbles, and model the aspherical collapse of a bubble with pieces of Rayleigh’s solution for spherical co...

Collapsing Sub-critical Bubbles *

In the standard scenario, the electroweak phase transition is a first order phase transition which completes by the nucleation of critical bubbles. Recently, there has been speculation that the standard picture of the electroweak phase transition is incorrect. Instead, it has been proposed that throughout the phase transition appreciable amounts of both broken and unbroken phases of SU(2) coexi...

Fission of Collapsing Cavitation Bubbles

High-speed observations (for example, Lauterborn and Bolle 1975, Tomita and Shima 1990, Frost and Sturtevant 1986) clearly show that though a collapsing cavitation bubble approaches its minimum size as a coherent single volume, it usually reappears in the first rebounding frame as a cloud of much smaller bubbles or as a highly distorted single volume (see, for example, figure 2). This paper exp...