February 1993 arXiv papers — page 5

D. Comelli, M. Pietroni

We show that in the Minimal Supersymmetric Standard Model one--loop effects at finite temperature may lead to a spontaneous breaking of CP invariance in the scalar sector. Requiring that the breaking takes place at the critical temperature for the electroweak phase transition, we find that the parameters space is compatible with a mass of the Higgs pseudosca

M. Hayakawa, A. I. Sanda

It is known that the existing experimental limit for$ CPT $ violation is rather poor; the 10 \% level at best. The $ \DSDQ $ rule is tested only up to 2 \%. In this note, we discuss the possibility of measuring $ T, CP, CPT $ and $ \DSDQ $ rule violations in the neutral $ K $ meson system. It is shown that not all the symmetry breaking parameters can be dete

C. F. Baillie, D. Espriu, D. A. Johnston

Ambartzumian et.al. suggested that the modified Steiner action functional had desirable properties for a random surface action. However, Durhuus and Jonsson pointed out that such an action led to an ill-defined grand-canonical partition function and suggested that the addition of an area term might improve matters. In this paper we investigate this and other

H. J. Schulz

Lecture notes from the Jerusalem Winter School on Theoretical Physics "Correlated Electron Systems", Dec. 1991 -- Jan. 1992. Contains a review of recent and not so recent results in the theory of correlated fermions in one dimension.

Nicholas B. Tufillaro

Recent progress toward classifying low-dimensional chaos measured from time series data is described. This classification theory assigns a template to the time series once the time series is embedded in three dimensions. The template describes the primary folding and stretching mechanisms of phase space responsible for the chaotic motion. Topological invaria

ET Vishniac, PH Diamond

We review mechanisms for the transport of angular momentum in accretion disks that are low mass, in the sense that the gravitational forces produced by the material in these disks has a negligible effect on disk dynamics. There is no established consensus on how this transport takes place. We note that for phenomenological reasons the traditional $α$ model i

D. C. Zheng, L. Zamic, H. Müther

It has been shown in the past that in a shell model calculation, restricted to 1Hbar*Omega 1p-1h configurations, the energy splitting between the lowest J=0-, T=0 and J=0-, T=1 states in 16O is mainly due to the tensor component of the nucleon-nucleon interaction. In this work, we extend the calculation to include 3Hbar*Omega 2p-2h and 3p-3h configurations.

Maria Girardi, William B. Johnson

A Banach space $\X$ has the complete continuity property (CCP) if each bounded linear operator from $L_1$ into $\X$ is completely continuous (i.e., maps weakly convergent sequences to norm convergent sequences). The main theorem shows that a Banach space failing the CCP (resp., failing the CCP and failing cotype) has a subspace with a finite dimensional deco

E. Alvarez, J. M. Gracia-Bondia, C. P. Martin

We have investigated the standard one-loop quantum corrections for a particularly simple non-commutative geometry model containing fermions interacting with a unique abelian gauge field and a unique scalar through Yukawa couplings. In this model there are certain relations among the different coupling constants quite similar to the ones appearing in the Conn

Igor Pesando

We consider vector induced lattice gauge theories, in particular we consider the QED induced and we show that at negative temperature corresponds to the dimer problem while at positive temperature it describes a gas of branched polymers with loops. We argue that these models are critical at $D_{cr}=6$ for $N\ne\infty$ and they are {\sl not} critical for $N=\

Jan de Boer, Tjark Tjin

By quantizing the generalized Drinfeld-Sokolov reduction scheme for arbitrary $sl_2$ embeddings we show that a large set $\cal W$ of quantum W algebras can be viewed as (BRST) cohomologies of affine Lie algebras. The set $\cal W$ contains many known $W$ algebras such as $W_N$ and $W_3^{(2)}$. Our formalism yields a completely algorithmic method for calculati

D. V. Nanopoulos, H. Pois

We have explored the electroweak phase transition in minimal supergravity models by extending previous analysis of the one-loop Higgs potential to include finite temperature effects. Minimal supergravity is characterized by two higgs doublets at the electroweak scale, gauge coupling unification, and universal soft-SUSY breaking at the unification scale. We h

Harry. J. Lipkin

The main motivation for B factories is the investigation of CP violation. We consider two questions: 1) Why has there been essentially no experimental progress in CP violation in the 28 years since its discovery in 1964? 2) Why do we expect better results from B factories?

John F. Donoghue, Barry R. Holstein

Recent attempts to detect the pion polarizability via analysis of $γγ\rightarrowππ$ measurements are examined. The connection between calculations based on dispersion relations and on chiral perturbation theory is established by matching the low energy chiral amplitude with that given by a full dispersive treatment. Using the values for the polarizability re

T. Elliott, S. F. King, P. L. White

We obtain an improved upper bound on the lightest neutral CP-even Higgs boson mass from a low energy renormalisation-group analysis of the Higgs sector of the next-to-minimal supersymmetric standard model. We find $m_h< 145$ GeV for $m_t=90$ GeV, decreasing to $m_h< 123$ GeV for $m_t=180$ GeV. We also discuss the light Higgs spectrum in the region of paramet

G. W. Gibbons, H. J. Pohle

A basic problem in quantizing a field in curved space is the decomposition of the classical modes in positive and negative frequency. The decomposition is equivalent to a choice of a complex structure in the space of classical solutions. In our construction the real tunneling geometries provide the link between the this complex structure and analytic propert

G. Ristow, H. J. Herrmann

Recent experiments by Baxter et al. showed the existence of density waves in granular material flowing out of a hopper. We show, using Molecular Dynamics Simulations, that this effect is a consequence of static friction and find that these density fluctuations follow a $1/f$ spectrum. The effect is enhanced when the opening angle of the hopper decreases.

Osamu Narikiyo, Daijiro Yoshioka

The collective charge-excitation spectrum of a double quantum well system in a strong magnetic field is obtained within the random phase approximation. Correction to the spectrum coming from the finiteness of the magnetic field is calculated up to the first order in inverse of the magnetic field. Dependencies on the magnetic field of (i) the velocity of long

A. V. Chubukov, A. Sokol

The specific heat and susceptibility data for $^3$He on Grafoil are analyzed in the framework of the Landau Fermi liquid theory. The dominant interaction between $^3$He quasiparticles is found to be in the p-wave channel for most experimentally accessible areal densities of $^{3}$He. This interaction is attractive and gives rise to the p-wave transition temp

X. Artru

An inventory is made of the experiments which can measure the transversely polarized quark distributions and fragmentation functions at leading twist. (Contribution to the 10th International Symposium on High Energy Spin Physics, Nagoya, Japan, Nov. 9-14, 1992)

Kevin Cahill

In theories with spontaneous symmetry breaking, the loop expansion of the effective potential is awkward. In such theories, the exact effective potential $V(ϕ_c,T)$ is real and convex (as a function of the classical field $ϕ_c$), but its perturbative series can be complex with a real part that is concave. These flaws limit the utility of the effective potent

A. Z. Mekjian, S. J. Lee

Various features of the mass yields in heavy ion collisions are studied. The mass yields are discussed in terms of iterative one dimensional discrete maps. These maps are shown to produce orbits for a monomer or for a nucleus which generate the mass yields and the distribution of cluster sizes. Simple Malthusian dynamics and non-linear Verhulst dynamics are

S. J. Lee, A. Z. Mekjian

A simple model is used to explore issues related to self-similarity, intermittency and scaling behavior in nuclear collisions. Both scaled factorial moments and power moments are considered in the investigation of these features. The product mass yields are used to construct probability distributions and generalized Renyi entropies. The scaling properties of

M. Lukin, A. Stern, I. Yakushin

We examine the problem of defining Lagrangian and Hamiltonian mechanics for a particle moving on a quantum plane $Q_{q,p}$. For Lagrangian mechanics, we first define a tangent quantum plane $TQ_{q,p}$ spanned by noncommuting particle coordinates and velocities. Using techniques similar to those of Wess and Zumino, we construct two different differential calc

A. Nakamichi, T. Ueno

A new vector field is introduced into 2-form Einstein gravity in four dimensions to restore a large symmetry of its topological version. Two different expressions for the BRST charge are given in the system: one of them associated with a set of irreducible symmetries and the other with a set of on-shell reducible symmetries.

Eric D&#39;Hoker, D. H. Phong

The Type II Superstring amplitude to 1-loop order is given by an integral of $\vartheta$-functions over the moduli space of tori, which diverges for real momenta. We construct the analytic continuation which renders this amplitude well defined and finite, and we find the expected poles and cuts in the complex momentum plane.

E. Abdalla, M. C. B. Abdalla, G. Sotkov, M. Stanishkov

We discuss the infinite dimensional algebras appearing in integrable perturbations of conformally invariant theories, with special emphasis in the structure of the consequent non-abelian infinite dimensional algebra generalizing $W_\infty$ to the case of a non abelian group. We prove that the pure left-symmetry as well as the pure right-sector of the thus ob

A. Berkovich, C. Gomez, G. Sierra

In this paper we consider a class of the 2D integrable models. These models are higher spin XXZ chains with an extra condition of the commensurability between spin and anisotropy. The mathematics underlying this commensurability is provided by the quantum groups with deformation parameter being an Nth root of unity. Our discussion covers a range of topics in

Amine M. El Gradechi

In this work we extend Onofri and Perelomov&#39;s coherent states methods to the recently introduced $OSp(1/2)$ coherent states. These latter are shown to be parametrized by points of a supersymplectic supermanifold, namely the homogeneous superspace $OSp(1/2)/U(1)$, which is clearly identified with a supercoadjoint orbit of $OSp(1/2)$ by exhibiting the corr

V. Pleitez, M. D. Tonasse

We consider a model for the electroweak interactions with $SU(3)_L\otimes U(1)_N$ gauge symmetry. We show that, it is the conservation of $F=L+B$ which forbids massive neutrinos and the neutrinoless double beta decay, $(ββ)_{0ν}$. Explicit and spontaneous breaking of $F$ imply that the neutrinos have an arbitrary mass and $(ββ)_{0ν}$ proceeds also with some

Tae-Sun Park, Dong-Pil Min, Mannque Rho

Chiral perturbation theory in heavy-fermion formalism is developed for meson-exchange currents in nuclei and applied to nuclear axial- charge transitions. Calculation is performed to the next-to-leading order in chiral expansion which involves graphs up to one loop. The result turns out to be very simple. The previously conjectured notion of &#34;chiral filt

Apoorva Patel

I review the current status of lattice QCD results. I concentrate on new analytical developments and on numerical results relevant to phenomenology.

L. K. Patel, N. Dadhich

We present a singularity free class of inhomogeneous cylindrical universes filled with stiff perfect fluid $(ρ= p)$. Its matter free $ (ρ= 0)$ limit yield two distinct vacuum spacetimes which can be considered as analogues of Kasner solution for inhomogeneous singularity free spacetime.

J. Audretsch, A. Economou, C. O. Lousto

The gravitational field of monopoles, cosmic strings and domain walls is studied in the quadratic gravitational theory $R+αR^2$ with $α|R|\ll 1$, and is compared with the result in Einstein&#39;s theory. The metric aquires modifications which correspond to a short range `Newtonian&#39; potential for gauge cosmic strings, gauge monopoles and domain walls and

Yutaka Hosotani

(Review) Properties of neutral and charged anyon fluids are examined, with the main focus on the question whether or not a charged anyon fluid exhibits a superconductivity at zero and finite temperature. Quantum mechanics of anyon fluids is precisely described by Chern-Simons gauge theory. The random phase approximation (RPA), the linearized self-consistent

Ross H. McKenzie, J. A. Sauls

Features in the zero sound attenuation near the pair-breaking edge in superfluid $^3$He-B have been observed in large magnetic fields. Schopohl and Tewordt [{\sl J. Low Temp. Phys.} {\bf 57}, 601 (1984)] claim that the $J=1^-, M=\pm 1$ order-parameter collective modes couple to zero sound as a result of the distortion of the equilibrium order parameter by a

Marco Andreatta, Jarosław A. Wiśniewski

Let $X$ be a normal variety over the field of complex numbers with log terminal singularities and the canonical divisor $K_X$ being ${\bf Q}$-Gorenstein. Assume that $L$ is an ample line bundle over $X$ and $ϕ: X\to Y$ is a morphism supported by $K_X+rL$ for some positive rational number $r$. In the present paper we study the evaluation $ϕ^*ϕ_*(L)\to L$ and