Results 1  10
of
19
A selftuning mechanism in (3+p)d gravityscalar theory
 J. High Energy Phys
, 2007
"... We present a new type of selftuning mechanism for (3+p)d brane world models in the framework of gravityscalar theory. This new type of selftuning mechanism exhibits a remarkable feature. In the limit gs → 0, gs being the string coupling, the geometry of bulk spacetime remains virtually unchanged ..."
Abstract

Cited by 3 (3 self)
 Add to MetaCart
(Show Context)
We present a new type of selftuning mechanism for (3+p)d brane world models in the framework of gravityscalar theory. This new type of selftuning mechanism exhibits a remarkable feature. In the limit gs → 0, gs being the string coupling, the geometry of bulk spacetime remains virtually unchanged by an introduction of the Standard Model(SM)brane, and consequently it is virtually unaffected by quantum fluctuations of SM fields with support on the SMbrane. Such a feature can be obtained by introducing NeveuSchwarz(NS)brane as a background brane on which our SMbrane is to be set. Indeed, field equations naturally suggest the existence of the background NSbrane. Among the given such models, of the most interest is the case with Λ = 0, where Λ represents the bulk cosmological constant. This model contains a pair of coincident branes (of the SM and the NSbranes), one of which is a codimension2 brane placed at the origin of 2d transverse space ( ≡ Σ2), another a codimension1 brane placed at the edge of Σ2. These two branes are (anti) Tduals of each other, and one of them may be identified as our SMbrane plus the background NSbrane. In the presence of the background NSbrane (and in the absence of Λ), the 2d transverse space Σ2 becomes an orbifold R2/Zn with an appropriate deficit angle. But this is only possible if the (3 + p)d Planck scale M3+p and the string scale Ms( ≡ 1 / √ α ′ ) are of the same order, which accords with the hierarchy assumption [1, 2, 3] that the electroweak scale mEW is the only short distance scale existing in nature. PACS number: 04.50.+h Keywords: cosmological constant problem, brane world, selftuning, NSbrane
Baryon vertices in AdS black hole background
"... We numerically computed the energy of QCD string junctions in nonsupersymmetric SU(N) gauge theories as the energy of brane configurations in the background of AdS black hole solutions, and extracted the contribution of baryon vertices. We obtain a negative vertex energy for the three and fourdim ..."
Abstract

Cited by 1 (0 self)
 Add to MetaCart
We numerically computed the energy of QCD string junctions in nonsupersymmetric SU(N) gauge theories as the energy of brane configurations in the background of AdS black hole solutions, and extracted the contribution of baryon vertices. We obtain a negative vertex energy for the three and fourdimensional YangMills theories and a vanishing vertex energy for the fivedimensional theory. Although string theory was originally constructed for the purpose of describing the behavior of quarks in hadrons, it has been developed for long time independently of hadron physics as a possible form for a theory unifying gravity and other interactions, because it can be formulated only in 10 or 26 spacetime dimensions,
A GridRPC Model and
 API for EndUser Applications, Tech. rep., Global Grid Forum (GGF) (jul 2005). URL http://www.gridforum.org/documents/GFD.52.pdf
"... We introduce the flavor symmetry ZM×ZN×D4 into the SU(6)×SU(2)R stringinspired model. The cyclic group ZM and the dihedral group D4 are R symmetries, while ZN is a nonR symmetry. By imposing the anomalyfree conditions on the model, we obtain a viable solution under many phenomenological constrain ..."
Abstract

Cited by 1 (0 self)
 Add to MetaCart
We introduce the flavor symmetry ZM×ZN×D4 into the SU(6)×SU(2)R stringinspired model. The cyclic group ZM and the dihedral group D4 are R symmetries, while ZN is a nonR symmetry. By imposing the anomalyfree conditions on the model, we obtain a viable solution under many phenomenological constraints coming from the particle spectra. For the neutrino sector, we find a LMAMSW solution but no SMAMSW solution. The solution includes phenomenologically acceptable results concerning fermion masses and mixings and also concerning hierarchical energy scales including the GUT scale, the µ scale and the Majorana mass scale of Rhanded neutrinos. It is likely that in the framework of a unified theory, the characteristic patterns of fermion masses and mixings are closely linked to the flavor symmetry. In addition, it is feasible that the flavor symmetry also controls the GUT scale, the µ scale and the Majorana mass scale of Rhanded neutrinos. In a previous paper1) the authors
and WilsonLoop
, 2000
"... The renormalization group equations of the YangMills theory are examined in the noncritical string theory according to the framework of the holography. Under a simple ansatz for the tachyon, we could find several interesting solutions which are classified by the value of the tachyon potential at t ..."
Abstract
 Add to MetaCart
(Show Context)
The renormalization group equations of the YangMills theory are examined in the noncritical string theory according to the framework of the holography. Under a simple ansatz for the tachyon, we could find several interesting solutions which are classified by the value of the tachyon potential at the vacuum. We show two typical, asymptoticfree solutions which are different in their infrared behaviors. For both types of solutions, we could obtain quarkconfinement potential from the Wilsonloop. The stability of the tachyon and the ZigZag symmetry are also discussed for these solutions. 1
from Noncritical String
, 2000
"... The renormalization group equations of the YangMills theory are examined in the noncritical string theory according to the framework of the holography. Under a simple ansatz for the tachyon, we could find several interesting solutions which are classified by the value of the tachyon potential at t ..."
Abstract
 Add to MetaCart
(Show Context)
The renormalization group equations of the YangMills theory are examined in the noncritical string theory according to the framework of the holography. Under a simple ansatz for the tachyon, we could find several interesting solutions which are classified by the value of the tachyon potential at the vacuum. We show two typical, asymptoticfree solutions which are different in their infrared behaviors. For both types of solutions, we could obtain quarkconfinement potential from the Wilsonloop. The stability of the tachyon and the ZigZag symmetry are also discussed for these solutions. 1
Noname manuscript No. (will be inserted by the editor) Slowly Rotating Black Holes in BransDickeMaxwell Theory
, 901
"... Abstract In this paper, we construct a class of (n+1)dimensional (n ≥ 4) slowly rotating black hole solutions in BransDikceMaxwell theory with a quadratic potential. These solutions can represent black holes with inner and outer event horizons, an extreme black hole and a naked singularity and th ..."
Abstract
 Add to MetaCart
(Show Context)
Abstract In this paper, we construct a class of (n+1)dimensional (n ≥ 4) slowly rotating black hole solutions in BransDikceMaxwell theory with a quadratic potential. These solutions can represent black holes with inner and outer event horizons, an extreme black hole and a naked singularity and they are neither asymptotically flat nor (anti)de Sitter. We compute the Euclidean action and use it to obtain the conserved and thermodynamics quantities such as entropy which does not obey the area law. We also compute the angular momentum and the gyromagnetic ratio for these type of black holes where the gyromagnetic ratio is modified in BransDicke theory compared to the Einstein theory. Keywords Black Holes · Thermodynamics · BransDicke 1 introduction BransDicke theory [1] is perhaps the most alternative theory to the Einstein general relativity. This theory contains both Mach’s principle and Dirac’s large number hypothesis. The theory has recently received interest as it arises naturally as the low energy limit of many theories of quantum gravity such as the supersymmetric string theory or the KaluzaKlein theory and is also found consistent with present cosmological observations [2]. The theory contains an adjustable parameter ω that represents the strength of coupling between scalar field and the matter. For certain values of ω, the BD theory agrees with GR in postNewtonian limit up to any desired accuracy and hence weakfield observations cannot rule out the BD theory in favor of general relativity [3], although the singularity problem has remained yet. Shortly after the appearance of this theory one of its authors, C. Brans obtained the statically spherically symmetric solutions [4]. After that many authors have investigated black holes in BransDicke theory [5]. Hawking has proved in four dimensions the stationary and vacuum BransDicke solution is just the Kerr solution with
New Instabilities of Nonlocal String Theories
"... We study “multitrace ” deformations of large N master fields in models with a mass gap. In particular, we determine the conditions for the multitrace couplings to drive tachyonic instabilities. These tachyons represent new local instabilities of the associated nonlocal string theories. In the partic ..."
Abstract
 Add to MetaCart
(Show Context)
We study “multitrace ” deformations of large N master fields in models with a mass gap. In particular, we determine the conditions for the multitrace couplings to drive tachyonic instabilities. These tachyons represent new local instabilities of the associated nonlocal string theories. In the particular case of Dpbranes at finite temperature, we consider topologychanging phase transitions and the effect of multitrace perturbations on the corresponding phase diagrams.
unknown title
, 1998
"... We give a short introduction to and a partial review of the work on the calculation of Wilson loops and Q ¯ Qpotentials via the conjectured AdS/CFT duality. Included is a discussion of the relative weight of the stringy correction to the target space background versus the correction by the quantum ..."
Abstract
 Add to MetaCart
(Show Context)
We give a short introduction to and a partial review of the work on the calculation of Wilson loops and Q ¯ Qpotentials via the conjectured AdS/CFT duality. Included is a discussion of the relative weight of the stringy correction to the target space background versus the correction by the quantum fluctuations of the string world sheet. 1 Based on talks at the conferences “32 nd
A selftuning mechanism in 6d gravityscalar theory
, 2007
"... We present a new type of selftuning mechanism for 6d brane world models in the framework of gravityscalar theory. This new type of selftuning mechanism exhibits a remarkable feature. In the weak coupling limit gs → 0, the geometry of bulk spacetime remains virtually unchanged by an introduction o ..."
Abstract
 Add to MetaCart
(Show Context)
We present a new type of selftuning mechanism for 6d brane world models in the framework of gravityscalar theory. This new type of selftuning mechanism exhibits a remarkable feature. In the weak coupling limit gs → 0, the geometry of bulk spacetime remains virtually unchanged by an introduction of the Standard Model(SM)brane, and consequently it is virtually unaffected by quantum corrections to the brane tension due to the dynamics of SM degrees of freedom. Such a feature can be obtained by introducing NeveuSchwarz(NS)brane as a background brane on which our SMbrane is to be set. Indeed, field equations naturally require the existence of the background NSbrane. Among the given such models, of the most interest is the case with Λ = 0, where Λ represents the bulk cosmological constant. This model contains two coincident branes (of the SM and the NSbranes), one of which is a codimension2 brane placed at the origin of 2d transverse space ( ≡ Σ2), another a codimension1 brane placed at the edge of Σ2. These two branes are Tduals of each other, and one of them is identified as our SMbrane (plus the background NSbrane). In the presence of the background NSbrane (and in the absence of Λ), the 2d transverse space Σ2 becomes R2 (or an orbifold R2/Zn) with an appropriate deficit angle. But this is possible only if the 6d Planck scale M6 and the string scale Ms( ≡ 1 / √ α ′ ) are of the same order, which accords with an assumption [1, 2, 3] that the electroweak scale mEW is the only short distance scale in nature. PACS number: 04.50.+h Keywords: cosmological constant problem, 6d brane world, selftuning, NSbrane
unknown title
, 1998
"... We give a short introduction to and a partial review of the work on the calculation of Wilson loops and Q ¯ Qpotentials via the conjectured AdS/CFT duality. Included is a discussion of the relative weight of the stringy correction to the target space background versus the correction by the quantum ..."
Abstract
 Add to MetaCart
(Show Context)
We give a short introduction to and a partial review of the work on the calculation of Wilson loops and Q ¯ Qpotentials via the conjectured AdS/CFT duality. Included is a discussion of the relative weight of the stringy correction to the target space background versus the correction by the quantum fluctuations of the string world sheet. 1 Based on talks at the conferences “32 nd