Abstract In this work, we present the thermodynamic study of a model that considers black hole as condensate gravitons. model, spacetime is not asymptotically flat because topological defect introduces an angle deficit in like Global Monopole solutions. We have obtained correction to Hawking temperature plus negative pressure associated with mass M . way, graviton condensate, which assumed be a...

We study general Lorentz invariant theories of massive gravitons. We show that, contrary to the standard lore, there exist consistent theories where the graviton mass term violates Pauli-Fierz structure. For theories where the graviton is a resonance, this does not imply the existence of a scalar ghost if the deviation from a Pauli-Fierz structure becomes sufficiently small at high energies. Th...

For there is always a wrong sign in the mass of graviton in the so-called perturbation expansion approximation of both Minkowski and de Sitter spacetimes, the existence of gravitational wave from the metric perturbation of de Sitter spacetime is doubtful. We try another way to start from the assumption that the gravitational wave equation should be both general covariant and conformal invariant...

Massive gravity previously constructed as the spin-2 quantum gauge theory is studied in the classical limit. The vector graviton field v which does not decouple in the limit of vanishing graviton mass gives rise to a modification of general relativity. The modified Schwarzschild solution contains a contribution from the v-field which can be interpreted as the dark matter mass density. We calcul...

Observations by laser interferometric detectors of gravitational waves from inspiraling compact binary systems can be used to search for a dependence of the waves’ propagation speed on wavelength, and thereby to bound the mass or Compton wavelength of a putative graviton. We study the effect of including higher harmonics, as well as their post-Newtonian amplitude corrections, in the template gr...

In this paper we lay the foundations of causal quantum gravity, i.e. of a quantum theory of self-interacting symmetric massless rank-2 tensor gauge fields, the gravitons, on flat space-time, in the framework of causal perturbation theory. The causal inductive construction of the S-matrix for quantum gravity leads to a very satisfactory treatment of the ultraviolet problem. Here we concentrate o...

A heuristic model of a composite graviton is presented motivated by open string field theory. The model simply assumes a composite closed string sector, world sheet conformal invariance and the observed open string states, i.e., standard model particles, as an input. A UV to IR map from the open string to the closed string sectors naturally emerges. The IR cutoff of the lightest observed fermio...

We study the full bosonic spectrum around giant and dual giant graviton probes in exactly marginally deformed backgrounds. Considering supersymmetric and non–supersymmetric three–parameter deformations of AdS5 × S, we perform a detailed analysis of small fluctuations for both the expanded D3–brane configurations. In particular, we enhance the scalar spectra of frequencies found in our previous ...

Some results of author’s work in a non-geometrical approach to quantum gravity are reviewed here, among them: a quantum mechanism of classical gravity giving a possibility to compute the Newton constant; asymptotic freedom at short distances; interaction of photons with the graviton background leading to the important cosmological consequences; the time delay of photons due to interactions with...