Scalar and tensor glueballs as gravitons

Abstract

The graviton solutions for the glueball spectrum of ref.[1] interpreted in a different manner lead to very interesting results which we describe in this comment.

Fluctuation and dissipation from a deformed string/gauge duality model

“…In Refs. [70][71][72][73][74][75][76]78] this metric was used to study many aspects of holographic high energy physics. In these references, k is a constant that can be related to Λ QCD .…”

“…Within this approach one can calculate quarkantiquark potential at zero and finite temperature, hadronic spectra, etc. [70][71][72][73][74][75][76][77][78][79].…”

“…The main goal of this work is to study zero and finite temperature string fluctuations using a deformed AdS space with the introduction of an exponential factor exp k=r 2 in the metric, motivated by the success of this approach to hadronic physics [70][71][72][73][74][75][76][77][78][79]. We calculate thermal fluctuations, the admittance from linear response, and two-point functions, and we show explicitly that the fluctuationdissipation theorem holds in this setup.…”

Proton structure functions from an AdS/QCD model with a deformed background

“…6 we show our results for the ratio F 2 =2F 1 versus q 2 , where one can see that this ratio is approximately equal to one, especially for large q 2 and x → 1, as anticipated by Eq. (55). It is worthwhile to mention that this is an approximately Callan-Gross relation F 2 ¼ 2xF 1 , for x → 1.…”

“…Such a deformation was considered before in a wide range of AdS/ QCD studies, as can be seen in Refs. [48][49][50][51][52][53][54][55][56][57][58][59][60][61][62]. Our DIS structure functions are compared with experimental data showing good agreement for large x.…”