On causal structure of homogeneous Lorentzian manifolds

1989 ◽  
Vol 21 (10) ◽  
pp. 1027-1045 ◽  
Author(s):  
A. Levichev
Keyword(s):  
Causal Structure ◽  
Lorentzian Manifolds

scholarly journals Spacetime Causal Structure and Dimension from Horismotic Relation

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
O. C. Stoica
Keyword(s):  
Causal Structure ◽  
Differentiable Manifold ◽  
Conformal Structure ◽  
Lorentzian Manifolds ◽  
Causal Sets ◽  
Discretization Methods ◽  
Starting Point ◽  
Theories Of Gravity ◽  
Natural Way ◽  
Construction Works

A reflexive relation on a set can be a starting point in defining the causal structure of a spacetime in General Relativity and other relativistic theories of gravity. If we identify this relation as the relation between lightlike separated events (the horismos relation), we can construct in a natural way the entire causal structure: causal and chronological relations, causal curves, and a topology. By imposing a simple additional condition, the structure gains a definite number of dimensions. This construction works with both continuous and discrete spacetimes. The dimensionality is obtained also in the discrete case, so this approach can be suited to prove the fundamental conjecture of causal sets. Other simple conditions lead to a differentiable manifold with a conformal structure (the metric up to a scaling factor) as in Lorentzian manifolds. This structure provides a simple and general reconstruction of the spacetime in relativistic theories of gravity, which normally requires topological structure, differential structure, and geometric structure (which decomposes in the conformal structure, giving the causal relations and the volume element). Motivations for such a reconstruction come from relativistic theories of gravity, where the conformal structure is important, from the problem of singularities, and from Quantum Gravity, where various discretization methods are pursued, particularly in the causal sets approach.

Special, radical, failure of reduction in psychiatry

2019 ◽  
Vol 42 ◽  
Author(s):  
Don Ross
Keyword(s):  
Mental Disorder ◽  
Brain Structure ◽  
Causal Structure ◽  
Network Models ◽  
Gambling Addiction ◽  
Brain Disorder ◽  
Mental Processes ◽  
Special Radical ◽  
Intentional Relationships

AbstractUse of network models to identify causal structure typically blocks reduction across the sciences. Entanglement of mental processes with environmental and intentional relationships, as Borsboom et al. argue, makes reduction of psychology to neuroscience particularly implausible. However, in psychiatry, a mental disorder can involve no brain disorder at all, even when the former crucially depends on aspects of brain structure. Gambling addiction constitutes an example.

Blocking Is Sensitive to Causal Structure in 4-Year-Old and 8-Year-Old Children

2005 ◽  
Vol 52 (4) ◽  
pp. 264-271 ◽  
Author(s):  
Tom Beckers ◽  
Uschi Van den Broeck ◽  
Marij Renne ◽  
Stefaan Vandorpe ◽  
Jan De Houwer ◽  
...  
Keyword(s):  
Young Children ◽  
Associative Learning ◽  
Learning Theory ◽  
Causal Structure ◽  
Age Groups ◽  
Learning Task ◽  
Contingency Learning

Abstract. In a contingency learning task, 4-year-old and 8-year-old children had to predict the outcome displayed on the back of a card on the basis of cues presented on the front. The task was embedded in either a causal or a merely predictive scenario. Within this task, either a forward blocking or a backward blocking procedure was implemented. Blocking occurred in the causal but not in the predictive scenario. Moreover, blocking was affected by the scenario to the same extent in both age groups. The pattern of results was similar for forward and backward blocking. These results suggest that even young children are sensitive to the causal structure of a contingency learning task and that the occurrence of blocking in such a task defies an explanation in terms of associative learning theory.

Institutional actors: Children’s emerging beliefs about the causal structure of social roles.

2020 ◽  
Vol 56 (1) ◽  
pp. 70-80
Author(s):  
Alexander Noyes ◽  
Frank C. Keil ◽  
Yarrow Dunham
Keyword(s):  
Social Roles ◽  
Causal Structure ◽  
Institutional Actors

Institutional actors: Children’s emerging beliefs about the causal structure of social roles

2019 ◽  
Author(s):  
Alexander Noyes ◽  
Frank Keil ◽  
Yarrow Dunham
Keyword(s):  
Soccer Player ◽  
Social Roles ◽  
Social Role ◽  
Causal Structure ◽  
Executive Orders ◽  
The Social ◽  
The World ◽  
Children's Beliefs ◽  
Institutional Actors ◽  
The U.S

Institutions make new forms of acting possible: Signing executive orders, scoring goals, and officiating weddings are only possible because of the U.S. government, the rules of soccer, and the institution of marriage. Thus, when an individual occupies a particular social role (President, soccer player, and officiator) they acquire new ways of acting on the world. The present studies investigated children’s beliefs about institutional actions, and in particular whether children understand that individuals can only perform institutional actions when their community recognizes them as occupying the appropriate social role. Two studies (Study 1, N = 120 children, 4-11; Study 2, N = 90 children, 4-9) compared institutional actions to standard actions that do not depend on institutional recognition. In both studies, 4- to 5-year-old children believed all actions were possible regardless of whether an individual was recognized as occupying the social role. In contrast, 8- to 9-year-old children robustly distinguished between institutional and standard actions; they understood that institutional actions depend on collective recognition by a community.

scholarly journals Causal imprinting in causal structure learning

2012 ◽  
Vol 65 (3) ◽  
pp. 381-413 ◽  
Author(s):  
Eric G. Taylor ◽  
Woo-kyoung Ahn
Keyword(s):  
Structure Learning ◽  
Causal Structure
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