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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We construct a generalization of the standard $\Lambda$CDM model, wherein wesimultaneously replace the spatially flat Robertson-Walker metric with itssimplest anisotropic generalization (LRS Bianchi I metric), and couple the colddark matter to the gravity in accordance with the energy-momentum squaredgravity (EMSG) of the form $f(T_{\mu\nu}T^{\mu\nu})\proptoT_{\mu\nu}T^{\mu\nu}$. These two modifications -- namely, two new stifffluid-like terms of different nature -- can mutually cancel out, i.e., theshear scalar can be screened completely, and reproduce mathematically exactlythe same Friedmann equation of the standard $\Lambda$CDM model. This evades theBBN limits on the anisotropy, and thereby provides an opportunity to manipulatethe cosmic microwave background quadrupole temperature fluctuation at thedesired amount. We further discuss the consequences of the model on the veryearly times and far future of the Universe. This study presents also an exampleof that the EMSG of the form $f(T_{\mu\nu}T^{\mu\nu})\proptoT_{\mu\nu}T^{\mu\nu}$, as well as similar type other constructions, is notnecessarily relevant only to very early Universe but may even be considered inthe context of a major problem of the current cosmology related to thepresent-day Universe, the so-called $H_0$ problem.

Screening anisotropy via energy-momentum squared gravity: $\Lambda$CDM model with hidden anisotropy