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

Using a representation of spatial infinity based in the properties ofconformal geodesics, the first terms of an expansion for the Bondi mass for thedevelopment of time symmetric, conformally flat initial data are calculated. Asit is to be expected, the Bondi mass agrees with the ADM at the sets where nullinfinity ``touches'' spatial infinity. The second term in the expansion isproportional to the sum of the squared norms of the Newman-Penrose constants ofthe spacetime. In base of this result it is argued that these constants mayprovide a measure of the incoming radiation contained in the spacetime. This isillustrated by means of the Misner and Brill-Lindquist data sets.Comment: Revtex, 5 page

Early radiative properties of the developments of time-symmetric conformally flat initial data