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

In this work we consider the possibility of describing the current evolutionof the universe, without the introduction of any cosmological constant or darkenergy (DE), by modifying the Einstein-Hilbert (EH) action. In the context ofthe f(R) gravities within the metric formalism, we show that it is possible tofind an action without cosmological constant which exactly reproduces thebehavior of the EH action with cosmological constant. In addition the f(R)action is analytical at the origin having Minkowski and Schwarzschild as vacuumsolutions. The found f(R) action is highly non-trivial and must be written interms of hypergeometric functions but, in spite of looking somewhat artificial,it shows that the cosmological constant, or more generally the DE, is not alogical necessity.Comment: 5 pages, no figure

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>f</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mi>R</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:math>gravity without a cosmological constant

f(R)gravity without a cosmological constant