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 employ gauge-gravity duality to study the backreaction effect of4-dimensional large-$N$ quantum field theories on constant-curvaturebackgrounds, and in particular de Sitter space-time. The field theoriesconsidered are holographic QFTs, dual to RG flows between UV and IR CFTs. Wecompute the holographic QFT contribution to the gravitational effective actionfor 4d Einstein manifold backgrounds. We find that for a given value of thecosmological constant $\lambda$, there generically exist two backreactedconstant-curvature solutions, as long as $\lambda < \lambda_{\textrm{max}} \simM_p^2 / N^2$, otherwise no such solutions exist. Moreover, the backreactioneffect interpolates between that of the UV and IR CFTs. We also find that, atfinite cutoff, a holographic theory always reduces the bare cosmologicalconstant, and this is the consequence of thermodynamic properties of thepartition function of holographic QFTs on de Sitter.

Back-reaction in massless de Sitter QFTs: holography, gravitational DBI action and f(R) gravity