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 Tools annual

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 Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

The motive of this work is to study gravitational collapse in Husainspace-time in Brans-Dicke gravity theory. Among many scalar-tensor theories ofgravity, Brans-Dicke is the simplest and the impact of it can be regulated bytwo parameters associated with it, namely, the Brans-Dicke parameter, $\omega$,and the potential-scalar field dependency parameter $n$ respectively. V.Husain's work on exact solution for null fluid collapse in 1996 has influencedmany authors to follow his way to find the end-state of thehomogeneous/in-homogeneous dust cloud. Vaidya's metric is used all over tofollow the nature of future outgoing radial null geodesics. Detecting whetherthe central singularity is naked or wrapped by an event horizon, by theexistence of future directed radial null geodesic emitted in past from thesingularity is the basic objective. To point out the existence of positivetrajectory tangent solution, both particular parametric cases(through tabularforms) and wide range contouring process have been applied. Precisely, perfectfluid's EoS satisfies a wide range of phenomena : from dust to exotic fluidlike dark energy. We have used the EoS parameter $k$ to determine the end stateof collapse in different cosmological era. Our main target is to check low$\omega$ (more deviations from Einstein gravity-more Brans Dicke effect) andnegative $k$ zones. This particularly throws light on the nature of theend-state of collapse in accelerated expansion in Brans Dicke gravity. It isseen that for positive values of EoS parameter $k$, the collapse results in ablack hole, whereas for negative values of $k$, naked singularity is the onlyoutcome. It is also to be noted that "low $\omega$" leads to the possibility ofgetting more naked singularities even for a non-accelerating universe.

Gravitational Collapse In Husain Space-time For Brans-Dicke Gravity Theory with Power-law Potential