Non-singular space-times with a negative cosmological constant: V. Boson stars

Abstract

We prove existence of large families of solutions of Einsteincomplex scalar field equations with a negative cosmological constant, with a stationary or static metric and a time-periodic complex scalar field.

Non-singular spacetimes with a negative cosmological constant: IV. Stationary black hole solutions with matter fields

“…It is clear that the method opens further possibilities, which remain to be explored. For example, the technique is used in [17] to construct boson star solutions.…”

Cosmographic analysis of a closed bouncing universe with the varying cosmological constant in $f(R,T)$ gravity

“…While this doesn't seem to agree with some observations which show a tiny positive value of Λ (≈ 10 −123 ) [84], the negative value of Λ can also fit a large data set and solve the eternal acceleration problem [85]. The negative Λ approach has been studied by many authors [85][86][87][88][89][90]. The negative Λ is also supported in the framework of the AdS/CFT correspondence [91].…”

Transition from decelerating to accelerating universe with quadratic equation of state in f(R,T) gravity

“…While observations suggest a very small positive Λ (Perlmutter et al 1999;Tonry et al 2003;Clocchiatti et al 2006), negative Λ is also possible by other observations and can present a solution to the eternal acceleration problem which has been shown to be a consequence of the positive Λ (Vincenzo et al 2008). The negative Λ approach has been studied by many authors (Cardenas et al 2003;Grande et al 2006;Gong and Wang 2007;Vincenzo et al 2008;Prokopec 2011;Landry et al 2012;Maeda and Ohta 2014;Baier et al 2015;Ahmed and Alamri 2018;ChruÅ›ciel et al 2018), and it is shown to be supported by the AdS/CFT correspondence (Aharony et al 2000). The possibility of observationally viable FRW cosmologies with negative Λ has been shown by (Prokopec 2011).…”

“…A stable de Sitter solution with negative Λ has been found in Gauss-Bonnet gravity by (Maeda and Ohta 2014). Solutions of Einsteincomplex scalar field equations with negative Λ has been presented in (ChruÅ›ciel et al 2018). So, the current solution with negative Λ has a solid theoretical and observational ground.…”