Antoniadis, Ignatios Benakli, Karim

We propose a generalisation of the Weak Gravity Conjecture in de Sitter space by studying charged black-holes and comparing the gravitational and an abelian gauge forces. Using the same condition as in flat space, namely the absence of black-hole remnants, one finds that for a given mass $m$ there should be a state with a charge $q$ bigger than a m...

Chandra, Kapil
Published in
Open Astronomy

In our study of the validity of Hawking’s predicted radiation temperature of a black-hole, we found that the calculated temperature is another form of Zeldovich’s expression for the cosmological constant. We reasoned that as Zeldovich predicted the extreme value of cosmological constant thus Hawking might have also predicted an extreme temperature....

haba, zbigniew

The time-dependent cosmological term arises from the energy-momentum tensor calculated in a state different from the ground state. We discuss the expectation value of the energy-momentum tensor on the right hand side of Einstein equations in various (approximate) quantum pure as well as mixed states. We apply the classical slow-roll field evolution...

Sanchez, Norma G.

The standard model of the universe is further completed back in time before inflation in agreement with observations, classical-quantum gravity duality and quantum space-time. Quantum vacuum energy bends the space-time and produces a constant curvature de Sitter background. We link de Sitter universe and the cosmological constant to the (classical ...

Bronnikov, K. Santos, N. O. Wang, Anzhong

With the arrival of the era of gravitational wave astronomy, the strong gravitational field regime will be explored soon in various aspects. In this article, we provide a general review over cylindrical systems in Einstein's theory of general relativity. In particular, we first review the general properties, both local and global, of several import...

Delmas-Rigoutsos, Yannis

This article suggests a new quantum mechanical framework to investigate the relations between space-time and particles. First, we introduce a formal framework to deal with possible worlds, we say potential worlds, independent of interpretations: the quantical modal logic. This framework is compatible but simpler than multiple-world and pilot-wave i...

Kehagias, Alex Lüst, Dieter Lüst, Severin
Published in
Journal of High Energy Physics

In the first part of this paper we will work out a close and so far not yet noticed correspondence between the swampland approach in quantum gravity and geometric flow equations in general relativity, most notably the Ricci flow. We conjecture that following the gradient flow towards a fixed point, which is at infinite distance in the space of back...

Demaerel, Thibaut; Maes, Christian; 7115; Struyve, Ward; 60284;

status: published

cremaschini, claudio tessarotto, massimo

The manifestly-covariant Hamiltonian structure of classical General Relativity is shown to be associated with a path-integral synchronous Hamilton variational principle for the Einstein field equations. A realization of the same variational principle in both unconstrained and constrained forms is provided. As a consequence, the cosmological constan...

Ghosh, Jewel Kumar Kiritsis, Elias Nitti, Francesco Witkowski, Lukas T.

We employ gauge-gravity duality to study the backreaction effect of 4-dimensional large-$N$ quantum field theories on constant-curvature backgrounds, and in particular de Sitter space-time. The field theories considered are holographic QFTs, dual to RG flows between UV and IR CFTs. We compute the holographic QFT contribution to the gravitational ef...