Zobrazeno 1 - 10
of 98
pro vyhledávání: '"B. Guberina"'
Publikováno v:
Physics Letters B. 636(2):80-85
We present a holographic dark-energy model in which the Newton constant $G_{N}$ scales in such a way as to render the vacuum energy density a true constant. Nevertheless, the model acts as a dynamical dark-energy model since the scaling of $G_{N}$ go
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d3dba83cc9cd5912390cbddf5138de2d
Publikováno v:
Physics Letters B
The preasymptotic effects originating from the four-quark operators are disentangled from the other contributions by considering appropriate combinations of inclusive decay rates. Under the assumption of the isospin and heavy-quark symmetry, a set of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::412ac1d1bb48715604633f13b5ee877d
https://doi.org/10.1016/s0370-2693(00)00620-1
https://doi.org/10.1016/s0370-2693(00)00620-1
Autor:
Claudio O. Dib, B. Guberina
Publikováno v:
Physics Letters B. 255:113-116
The ΔQ=−ΔS transitions in semileptonic decays of neutral kaons are estimated. We find a suppression of 10−7 with respect to the allowed ΔQ=ΔS transition, within the standard model. Asymmetries in semileptonic decays of KL and Ks as well as ti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a6eb6796536be22ae57e8c3dc66027da
https://doi.org/10.1016/0370-2693(91)91149-p
https://doi.org/10.1016/0370-2693(91)91149-p
We study the infrared effective theory of gravity that stems from the quantum trace anomaly. Quantum fluctuations of the metric induce running of the cosmological constant and the Newton constant at cosmological scales. By imposing the generalized Bi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::befb2f54cdcbf0ec6e8a12d02b372ff9
http://arxiv.org/abs/0707.3830
http://arxiv.org/abs/0707.3830
It has been well established by today that the concept of holographic dark energy (HDE) does entail a serious candidate for the dark energy of the universe. Here we deal with models where the holographic bound for dark energy is not saturated for a l
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::85192ff61f1756557b5bf8e5f62e6e49
http://arxiv.org/abs/astro-ph/0611299
http://arxiv.org/abs/astro-ph/0611299
We consider a holographic dark energy model, in which both the CC energy density rho_Lambda and the Newton constant G_N are varying quantities, to study the problem of setting an effective field-theory IR cutoff. Assuming that ordinary matter scales
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7aebbdb4a931eafda448cde8473fbb1a
We use the generalized holographic dark energy model, in which both the cosmological constant (CC) and Newton's constant G_N are scale-dependent, to set constraints on the renormalization-group (RG) evolution of both quantities phrased within quantum
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a7fdccf765e2bcbaf9436ca96f8b1f6c
https://www.bib.irb.hr/204521
https://www.bib.irb.hr/204521
Publikováno v:
Physical Review D. 70
We investigate a possible background of the type {omega}{sub c}{sup 0}{yields}{xi}{sub c}{sup +}{pi}{sup -} to the CLEO {xi}{sub c}{sup +} lifetime measurement. This decay mode may lead to an overestimate of the {xi}{sub c}{sup +} decay length and, t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::45633d6f20823bc107844e13603466a7
https://doi.org/10.1103/physrevd.70.117501
https://doi.org/10.1103/physrevd.70.117501
For cosmologies including scale dependence of both the cosmological and the gravitational constant, an additional consistency condition dictated by the Bianchi identities emerges, even if the energy-momentum tensor of ordinary matter stays individual
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d93754ca8496aaf14d63e546818cd099
For a generic quantum field theory we study the role played by the renormalization-group (RG) running of the cosmological constant (CC) in determining the ultimate fate of the universe. We consider the running of the CC of generic origin (the vacuum
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ab620b7206597f248af7dfeda8f8e4d4
http://arxiv.org/abs/hep-ph/0211184
http://arxiv.org/abs/hep-ph/0211184