English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The present study, on the expansion of universe, is based on an assumptionregarding the possibility of inter-conversion between matter and dark energy,through some interaction of matter with the scalar field in the framework ofBrans-Dicke theory. The field equations for a spatially flat space-time havebeen solved using an empirical dependence of scalar field parameter upon thescale factor. To represent the behaviour regarding the non-conservation ofmatter, a function, expressed in terms of the Hubble parameter, has beenempirically incorporated into the field equations. Their solution shows that,this function, whose value is proportional to the matter content of theuniverse, decreases monotonically with time. This matter-field interactiongenerates late time acceleration, causing the deceleration parameter to changeits sign from positive to negative. Time dependence of the proportion of darkenergy component of the universe has been determined and shown graphically.Time variation of gravitational constant and the Brans-Dicke dimensionlessparameter has been analyzed in the present study. The rate of generation ofdark energy from matter has been found to affect the time variations ofdeceleration parameter and gravitational constant.

A Study of Cosmic Expansion Generated by Non-conservation of Matter in the Framework of Brans-Dicke Theory