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1.
We obtain exact results in α′ for open and closed A-model topological string amplitudes on a large class of toric Calabi-Yau threefolds by using their correspondence with five
dimensional gauge theories. The toric Calabi-Yaus that we analyze are obtained as minimal resolution of cones over Y
p,q
manifolds and give rise via M-theory compactification to SU(p) gauge theories on . As an application we present a detailed study of the local case and compute open and closed genus zero Gromov-Witten invariants of the orbifold. We also display the modular structure of the topological wave function and give predictions for higher genus amplitudes.
The mirror curve in this case is the spectral curve of the relativistic A
1 Toda chain. Our results also indicate the existence of a wider class of relativistic integrable systems associated to generic
Y
p,q
geometries. 相似文献
2.
The multiplicity dependence of inclusive spectra of identified hadrons (π, K,
, K
S
0
, and Λ) produced in high-energy
p and pp collisions is studied. Analysis of experimental data on high-p
T hadron cross sections obtained at the Tevatron and RHIC is performed in the framework of z scaling. Independence of the scaling function ψ(z) on the multiplicity density dN
ch/dη is established. The multiplicity density measured in nucleon-nucleon collisions reaches much higher values than the corresponding
quantity [1/(0.5N
p)]dN
ch/dη obtained in heavy-ion collisions. Its influence on particle production reveals properties of self-similarity and fractality.
The relation between the scaling variable z and thermodynamic quantities (“heat capacity” and “temperature”) of the medium associated with the produced inclusive particle
is discussed. Search for z-scaling violation in
p and pp collisions at very high multiplicities as an indication of new-physics phenomena is suggested.
The text was submitted by the authors in English. 相似文献
3.
V. A. Bednyakov Ju. A. Budagov A. V. Gladyshev D. I. Kazakov E. V. Khramov D. I. Khubua 《Physics of Atomic Nuclei》2009,72(4):619-637
Prospects for observation of a SUSY-like signal from two gluinos are investigated within a certain region of the mSUGRA parameter space, where the cross section of the two-gluino production
in pp-collisions at the LHC ( = 14 TeV) is estimated at a rather high level of 17.3 pb. In this so-called EGRET-preferred region, the lightest stable neutralinos
χ
10 can serve as cold-dark-matter particles and can naturally explain the excess of diffuse Galactic gamma rays observed by the
EGRET space apparatus. The -event selection relies on a clear signature when decay products of each gluino contain one b
pair, one or two l
pair(s) or one or two light q
pair(s), and a neutralino. Rather high transverse missing energy carried away by the two neutralinos is the essential signature
of the events using of which allows the relevant Standard Model background to be reduced significantly. Furthermore, distributions
of the reconstructed invariant masses of two opposite-charged-lepton or light-jet pairs produced by the χ
20 → χ
10
l
+
l
− and χ
20 → χ
10
q
three-body decays have kinematic end points which measure the difference between masses of χ
20 and χ
10. In particular, it was found that these signatures of selected processes demonstrate good prospects for discovery of gluinos
at the LHC. These signatures allow one to distinguish different mSUGRA parameters m
1/2 within the EGRET-preferred region (at a higher than 6σ confidence level with 300 fb−1 data).
The text was submitted by the authors in English. 相似文献
4.
In wurtzite-based quantum wells and superlattices with the c axis parallel to the layer plane, this plane is parallel either to a symmetry plane of the wurtzite lattice (type I structures,
the 〈110〉 growth direction) or to a glide plane containing the c axis (type II structures, the 〈100〉 growth direction). In both cases, the space symmetry of the structure depends on the parity of the number of monolayers
within the slab(s). The point symmetry is C
2v
except for the type II structures with odd monolayer number(s). The latter structures have the σ
v
point symmetry and can have a built-in electric field. Quite different selection rules, depending on the structure symmetry,
govern electron optical transitions and exciton radiative recombination.
The major part of the proceedings of the XIII Feofilov Symposium was published in Fizika Tverdogo Tela (Physics of the Solid State), 2008, Vol. 50, No. 9.
The text was submitted by the authors in English. 相似文献
5.
The notion of a p-adic superspace is introduced and used to give a transparent construction of the Frobenius map on p-adic cohomology of a smooth projective variety over (the ring of p-adic integers), as well as an alternative construction of the crystalline cohomology of a smooth projective variety over
(finite field with p elements).
Partly supported by NSF grant No. DMS 0505735. 相似文献
6.
The spectral action on the equivariant real spectral triple over is computed explicitly. Properties of the differential calculus arising from the Dirac operator are studied and the results
are compared to the commutative case of the sphere .
UMR 6207, – Unité Mixte de Recherche du CNRS et des Universités Aix-Marseille I, Aix-Marseille II et de l’Université du Sud
Toulon-Var, Laboratoire affilié à la FRUMAM – FR 2291.
Partially supported by Polish Government grants 189/6.PRUE/2007/7; 115/E-343/SPB/6.PR UE/DIE and N 201 1770 33. 相似文献
7.
V. V. Kassandrov 《Physics of Atomic Nuclei》2009,72(5):813-827
First principles should predetermine physical geometry and dynamics both together. In the “algebrodynamics” they follow solely
from the properties of biquaternion algebra and the analysis over . We briefly present the algebrodynamics over Minkowski background based on a nonlinear generalization to of the Cauchi-Riemann analyticity conditions. Further, we consider the effective real geometry uniquely resulting from the
structure of multiplication and found it to be of the Minkowski type, with an additional phase invariant. Then we pass to study the primordial
dynamics that takes place in the complex space and brings into consideration a number of remarkable structures: an ensemble of identical correlated matter pre-elements
(“duplicons”), caustic-like signals (interaction carriers), a concept of random complex time resulting in irreversibility
of physical time at macrolevel, etc. In partucular, the concept of “dimerous electron” naturally arises in the framework of
complex algebrodynamics and, together with the above-mentioned phase invariant, allows for a novel approach to explanation
of quantum interference phenomena alternative to recently accepted wave—particle dualism paradigm.
The text was submitted by the author in English. 相似文献
8.
M. Janek V. P. Ladygin L. S. Azhgirey T. Uesaka Yu. V. Gurchin M. Hatano K. Itoh A. Yu. Isupov J. -T. Karachuk H. Kato T. Kawabata V. A. Krasnov A. N. Khrenov A. S. Kiselev V. A. Kizka J. Kliman A. K. Kurilkin P. K. Kurilkin N. B. Ladygina A. N. Livanov Y. Maeda A. I. Malakhov V. Matousek M. Morhach J. Nishikawa Yu. K. Pilipenko T. Ohnishi H. Okamura S. M. Piyadin S. G. Reznikov T. Saito S. Sakaguchi H. Sakai N. Sakamoto S. Sakoda Y. Sasamoto Y. Satou K. Sekiguchi K. Suda M. A. Shikhalev A. Tamii I. Turzo N. Uchigashima T. A. Vasiliev K. Yako L. S. Zolin 《Physics of Atomic Nuclei》2008,71(9):1495-1501
The investigation of the spin structure of d, 3H, and 3He has been performed at the RIKEN acceleration research facility and VBLHE. Vector A
y
and tensor A
yy
, A
xx
, A
xz
analyzing powers for
d → 3Hen and
d → 3Hp are presented at 270 MeV. Themirror channels (3Hen and 3Hp) are comparedto each other in order to find possible manifestation of charge-symmetry breaking. The preliminary results on
the polarization observables for
d → 3Hp at 200MeV are also presented. The obtained data are compared with one-nucleon-exchange calculations.As a byproduct,
d → pX and
12C → pX breakup reactions are investigated at 140, 200, and 270MeV. The experimental data on
p elastic scattering were obtained at 270, 880, and 2000 MeV at the Nuclotron. The polarization of the deuteron beam was measured
at 270 MeV at the internal target station. The preliminary data on the vector A
y
and tensor A
yy
, A
xx
analyzing powers for the
p elastic scattering at 880 MeV are presented. The calculations on A
y
, A
yy
, and A
xx
analyzing powers for the
p elastic scattering at 880 MeV were performed in the framework of the multiple-scattering model.
The text was submitted by the authors in English. 相似文献
9.
For the Lie algebra
N we introduce a system of differential operators called the dynamical operators. We prove that the dynamical differential operators commute with the
N rational quantized Knizhnik–Zamolodchikov difference operators. We describe the transformations of the dynamical operators under the natural action of the
N Weyl group.Mathematics Subject Classifications (2000). 17B37, 17B80, 81R10. 相似文献
10.
Tadayoshi Adachi 《Letters in Mathematical Physics》2007,82(1):1-8
For an N-body Stark Hamiltonian , the resolvent estimate holds uniformly in with Re and Im , where , and is a compact interval. This estimate is well known as the limiting absorption principle. In this paper, we report that by
introducing the localization in the configuration space, a refined resolvent estimate holds uniformly in with Re and Im .
Dedicated to Professor Hideo Tamura on the occasion of his 60th birthday 相似文献
11.
The paper is devoted to the calculation of two-loop (α
s
2) MSSM corrections to the relation between the pole mass of the t quark and its running mass in the scheme. Firstly, the value of the second-order contribution from large-mass expansion in mt/M
SUSY is studied. Contrary to our expectations, this contribution turned out to be negligible. As a by-product of this calculation,
the two-loop anomalous dimension of the running quark mass is obtained in the supersymmetric QCD. Secondly, the influence of the two-loop corrections to the t-quark mass on the predicted superpartner masses is investigated.
The text was submitted by the authors in English. 相似文献
12.
We show that the algebra of commuting Hamiltonians of the homogeneous XXX Heisenberg model has simple spectrum on the subspace of singular vectors of the tensor product of two-dimensional -modules. As a byproduct we show that there exist exactly two-dimensional vector subspaces with a basis such that deg f = l, deg g = n − l + 1 and f (u)g(u − 1) − f (u − 1)g(u) = (u + 1)
n
.
Supported in part by NSF grant DMS-0601005.
Supported in part by RFFI grant 08-01-00638.
Supported in part by NSF grant DMS-0555327. 相似文献
13.
G. A. Kozlov 《Physics of Particles and Nuclei Letters》2009,6(1):18-20
The leptonic () decay of a heavy quark-antiquark bound state T(
Q) with a Higgs-boson H emission is investigated. Applying the low-energy theorem to meson-Higgs coupling allows one to estimate the probability
of the decay T(
Q) →
H. Only the simple version of the Standard Model extension containing two-Higgs doublet is considered.
The text was submitted by the author in English. 相似文献
14.
Xiang Liu Zhi-Gang Luo Yan-Rui Liu Shi-Lin Zhu 《The European Physical Journal C - Particles and Fields》2009,61(3):411-428
We perform a systematic study of the possible molecular states composed of a pair of heavy mesons such as
,
,
in the framework of the meson exchange model. The exchanged mesons include the pseudoscalar, scalar and vector mesons. Through
our investigation, we find the following results. (1) The structure X(3764) is not a molecular state. (2) There exists strong attraction in the range r<1 fm for the
system with J=0,1. If future experiments confirm Z
+(4051) as a loosely bound molecular state, its quantum number is probably J
P
=0+. Its partner state Φ
**0 may be searched for in the π
0
χ
c1 channel. (3) Vector meson exchange provides strong attraction in the
channel together with pion exchange. A bound state solution may exist with a reasonable cutoff parameter Λ∼1.4 GeV. X(3872) may be accommodated as a molecular state dynamically although drawing a very definite conclusion needs further investigation.
(4) The
molecular state may exist. 相似文献
15.
S. M. Bilenky 《Physics of Particles and Nuclei》2008,39(5):641-673
Phenomenological issues of CP violation in the quark sector of the Standard Model are discussed. We consider quark mixing in the SM, standard, and Wolfenstein
parametrization of the CKM mixing matrix and unitarity triangle. We discuss the phenomenology of CP violation in K
L
0 and B
d
0()-decays. The standard unitarity triangle fit of the existing data is discussed. In appendix A we compare the K
0 ⇆ , B
d,s
0 ⇆
, etc. oscillations with neutrino oscillations. In Appendix B we derive the evolution equation for the M − system in the Weisskopf-Wigner approximation.
The text was submitted by the author in English. 相似文献
16.
A.?Bartl W.?Majerotto K.?M?nig A.?N.?Skachkova N.?B.?Skachkov 《Physics of Particles and Nuclei Letters》2009,6(3):181-189
We study pair production of scalar top quarks (stop, ) in e
+
e
− collisions with the subsequent decay of the top squarks into b quarks and charginos . We simulate this process by using PYTHIA6.4 for the beam energy 2E
b
= = 350, 400, 500, 800, 1000 GeV. A set of criteria for physical variables is proposed, which provides good separation of stop
signal events from top quark pair production being the main background. These criteria allow us to reconstruct the mass of
the top squark with an integrated luminosity of 1000 fb−1 provided that the neutralino mass is known.
The article is published in the original. 相似文献
17.
Let
be a Hilbert space with an inner product
. In Jajte, R., and Paszkiewicz, A. (1978, Vector measure on the closed subspaces of a Hilbert space, Studia Mathematica
63, 229–251), the
-measure on the logic of all orthogonal projections on
H was studied. We examine the
-measure on the hyperbolic logic of all J-projections on a Krein space.
PACS: 03.65.Ta, 03.65.Db, 03.65.Ca. 相似文献
18.
We present results for the universal anomalous dimension γ
uni(j) of Wilson twist-2 operators in the = 4 supersymmetric Yang-Mills theory in the first four orders of perturbation theory.
The text was submitted by the authors in English. 相似文献
19.
Shu-Fan Mo Ji-Rong Ren Li Zhao Tao Zhu 《International Journal of Theoretical Physics》2009,48(3):645-657
In this paper, by making use of Duan’s topological current theory, the branch process of Chern-Simons (CS) p-branes is discussed in detail. Chern-Simons (CS) p-branes are found generating or annihilating at the limit points and encountering, splitting, or merging at the bifurcation
points and higher degenerated points systematically of the vector order parameter field
. Furthermore, it is also shown that CS p-branes are found splitting or merging at the degenerate point of field function
but the total topological charges of the CS p-branes are still unchanged. 相似文献
20.
A trajectory attractor is constructed for the 2D Euler system containing an additional dissipation term −ru, r > 0, with periodic boundary conditions. The corresponding dissipative 2D Navier-Stokes system with the same term −ru and with viscosity v > 0 also has a trajectory attractor, . Such systems model large-scale geophysical processes in atmosphere and ocean (see [1]). We prove that → as v → 0+ in the corresponding metric space. Moreover, we establish the existence of the minimal limit of the trajectory attractors as v → 0+. We prove that is a connected invariant subset of . The connectedness problem for the trajectory attractor by itself remains open.
Dedicated to the memory of Leonid Volevich
Partially supported by the Russian Foundation for Basic Research (projects no 08-01-00784 and 07-01-00500). The first author
has been partially supported by a research grant from the Caprio Foundation, Landau Network-Cento Volta. 相似文献