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True Collapse and False Collapse [article]

Philip Pearle
1998 arXiv   pre-print
It is argued that various "decoherence" based approaches, illustrated by models in which a density matrix undergoes "False Collapse," do not satisfactorily resolve these problems of SQT.  ...  It is shown how the model based upon the Continuous Spontaneous Localization (CSL) theory, in which an individual statevector undergoes "True Collapse," gives a satisfactory description of events.  ...  It suggests that density matrix's False Collapse only makes sense if, actually, it corresponds to statevector's True Collapse.  ... 
arXiv:quant-ph/9805049v1 fatcat:q3r352bjobc2hemcxfaph3fr4e

Collapse Dynamics and Collapse Models

Richard B. Larson
1977 Symposium - International astronomical union  
In this report we shall discuss briefly the current status of theoretical attempts to understand this problem, based on calculations of the dynamics of collapsing clouds and protostars.  ...  There are two reasons for a nonuniform collapse: (1) any initial density inhomogeneities in a collapsing cloud tend to be amplified because the densest regions collapse fastest, and (2) the collapse of  ...  The nonhomologous collapse found in the spherical case occurs also in the two-and three-dimensional collapse calculations (see below), and has many important implications for the later evolution of collapsing  ... 
doi:10.1017/s0074180900142354 fatcat:hrscq6k4yvbzhbj7vyiwpnmgpm

Collapse

Constance Smith
2020 Focaal: Journal of Global and Historical Anthropology  
In Nairobi, the speed of urban growth is producing a parallel threat of architectural failure: in a recent spate of tower block collapses, many have died.  ...  Nairobians describe collapsed tower blocks as "fake," referring to ideas of the counterfeit, as well as anxieties about morally suspect economies.  ...  Of the tenants I met who had been displaced by collapses, most were back living in tenements similar to those that had collapsed.  ... 
doi:10.3167/fcl.2020.860102 fatcat:nveprqvzt5cktehnd4zyiqwvei

Collapse

Ernest Walsh
1922 Poetry  
COLLAPSE  ... 
fatcat:ku3czpgee5ciljcia5li2docpa

Collapse? What Collapse? Societal Change Revisited

A. Lawler
2010 Science  
As far back as the 1800s, research- Collapse? What Collapse?  ...  "There was no collapse," he insists.  ... 
doi:10.1126/science.330.6006.907 pmid:21071644 fatcat:kxk7nxvhyzb37lvddwstzxcpsy

Gravitational collapse: expanding and collapsing regions

M. Sharif, G. Abbas
2010 General Relativity and Gravitation  
The minimal pressure provides the gateway to explore the expanding and collapsing regions.  ...  We investigate the expanding and collapsing regions by taking two well-known spherically symmetric spacetimes.  ...  We find that in the region, where collapse occurs, density re-mains finite which means that collapse does not end as singularity and hence known as non-singular collapse.  ... 
doi:10.1007/s10714-010-0952-1 fatcat:d2ugqth5sbcghj4w2mi6siazyu

Shock-Induced Bubble Collapse versus Rayleigh Collapse

Anil Kapahi, Chao-Tsung Hsiao, Georges L Chahine
2015 Journal of Physics, Conference Series  
This paper compares two physical mechanisms for the collapse of a bubble near a rigid wall: a traveling shock-induced collapse and a Rayleigh-like collapse due to a uniform rise of the pressure around  ...  scenarios, uniform collapse (solid lines) and shock collapse (dashed lines).  ...  The Rayleigh-like collapse scenario results in a faster collapse compared to the shock-induced collapse scenario for the same driving pressure.  ... 
doi:10.1088/1742-6596/656/1/012128 fatcat:evymcrzpgnaebmnb36zlysxxjq

Analyzing Collapsed Contingency Tables Without Actually Collapsing

Paul D. Allison
1980 American Sociological Review  
s (1975: 47) collapsibility theorem.  ...  Even when one has a computer program to do the collapsing, it can be inconvenient to shift back and forth between different collapsed tables.  ... 
doi:10.2307/2095247 fatcat:v3u2d3vxjbbzbfjyjjhnii2dwa

Knots in collapsible and non-collapsible balls [article]

Bruno Benedetti, Frank H. Lutz
2013 arXiv   pre-print
We exhibit a second 3-ball B_12,38 with 12 vertices that is collapsible and evasive, but not shellable.  ...  We construct the first explicit example of a simplicial 3-ball B_15,66 that is not collapsible. It has only 15 vertices.  ...  A (not necessarily pure) d-complex C is collapsible if it collapses onto a single vertex.  ... 
arXiv:1303.2070v2 fatcat:74eashjmfndgnfyyrnvxcskjqu

Iatrogenic collapse

B Hemphill
1979 BMJ (Clinical Research Edition)  
Iatrogenic collapse SIR,-Your leading article on iatrogenic collapse (18 August, p 408) pointed out that the Joint Committee on Contraception recommended that at the insertion of intrauterine contraceptive  ... 
doi:10.1136/bmj.2.6190.608-a pmid:497725 pmcid:PMC1596544 fatcat:okp6joseszcj7chkps2wln6ljm

Texture collapse

T. Prokopec, A. Sornborger, R. H. Brandenberger
1992 Physical Review D, Particles and fields  
We study single-texture collapse using a leapfrog discretization method on a 30X30X30 spatial lattice.  ...  For radially asymmetric cases, contraction of one axis (pancake case) slightly reduces collapse time and critical winding, and contraction of two axes (cigar case) reduces collapse time and critical winding  ...  This means that no collapse occurs.  ... 
doi:10.1103/physrevd.45.1971 pmid:10014569 fatcat:s2ukcf4zqbddnfy62stjfcyjgu

Gravitational Collapse

H. BONDI
1964 Nature  
NATURE 275 LETTERS TO THE EDITOR MATHEMATICS Gravitational Collapse IN recent discussionst of the problem of gravitational collapse reference has repeatedly been made to the 'nucleonic mass' of a body  ...  IN recent discussionst of the problem of gravitational collapse reference has repeatedly been made to the 'nucleonic mass' of a body as an integral involving the density and pressure of the material.  ... 
doi:10.1038/202275a0 fatcat:lj4yi5txnncvlk2tzcbj3s2xpi

Voltage collapse

M.L. Crow, B.C. Lesieutre
1994 IEEE potentials  
Therefore, most of the effort focused on voltage collapse has centered on predicting the occurrence of a collapse by finding an estimate, or index, of how close the system is to the critical point.  ...  (c) Energy measure between SOP, UOP, and PMPT Fig. 3 Comparison of voltage collapse indices.  ... 
doi:10.1109/45.283883 fatcat:g66jx57ksfchnnxahlf42d7tci

Collapsing Closures [chapter]

Xuan Li, Andy King, Lunjin Lu
2006 Lecture Notes in Computer Science  
This tactic collapses closure calculations in two important respects.  ...  This paper shows how abstract unification can be reformulated so that closures can be collapsed in two senses.  ...  identifiers can be collapsed into a single computation.  ... 
doi:10.1007/11799573_13 fatcat:dgykvlx7ajdarbk4j5jqf6scrm

GRAVITATIONAL COLLAPSE

T. Y. Thomas
1964 Proceedings of the National Academy of Sciences of the United States of America  
of the body will be large during a small time interval at the beginning of the collapse.  ...  Hence these local explosions may well be self-perpetuating provided they are created in sufficient number in the initial stage of the collapse.  ... 
doi:10.1073/pnas.52.5.1309 pmid:16578580 pmcid:PMC300441 fatcat:rtmrfz2x65efxc4uhbpwhzbwgy
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