Populating the Landscape: A Top Down Approach
نویسندگان
چکیده
We put forward a framework for cosmology that combines the string landscape with no boundary initial conditions. In this framework, amplitudes for alternative histories for the universe are calculated with final boundary conditions only. This leads to a top down approach to cosmology, in which the histories of the universe depend on the precise question asked. We study the observational consequences of no boundary initial conditions on the landscape, and outline a scheme to test the theory. This is illustrated in a simple model landscape that admits several alternative inflationary histories for the universe. Only a few of the possible vacua in the landscape will be populated. We also discuss in what respect the top down approach differs from other approaches to cosmology in the string landscape, like eternal inflation. [email protected] [email protected]
منابع مشابه
A Comparative Study of Effect of Bottom-up and Top-down Instructional Approaches on EFL Learners’ Vocabulary Recall and Retention
This quasi-experimental study investigated the effect of bottom-up and top-down instructional approaches on English as a foreign language (EFL) vocabulary recall and retention. To this end, 44 high school students from two intact classes were assigned to bottom-up (n = 21) and top-down (n = 23) groups. The participants were exposed to 20 hours of explicit vocabulary instruction during 10 weeks ...
متن کاملOntology-Driven Document Enrichment: Principles and Case Studies
In this paper we present an approach to document enrichment, which consists of associating formal knowledge models to archives of documents, to provide intelligent knowledge retrieval and (possibly) additional knowledge services, beyond what is available using 'standard' information retrieval and search facilities. The approach is ontology-driven, in the sense that the construction of the knowl...
متن کاملCase Studies in Ontology-Driven Document Enrichment
In this paper we present an approach to document enrichment, which consists of associating formal knowledge models to archives of documents, to provide intelligent knowledge retrieval and (possibly) additional knowledge services, beyond what is available using 'standard' information retrieval and search facilities. The approach is ontology-driven, in the sense that the construction of the knowl...
متن کاملآسیبشناسی برنامۀ درس طراحی در رشتۀ معماری منظر در ایران 1
The Landscape Architecture program in the educational and research system of Iran is no more than two decades old. As a professional discipline, its theoretical and practical grounds need to be developed to assist in training professionals and localization purposes. Also, training for design, as the core of the pedagogy and practice in landscape architecture, requires the broadening of concepts...
متن کامل