119421763
High precision study of the space distribution of the colour flux in the SU(2) lattice gauge theory
Abstract The work of the Cracow-LSU collaboration on the space structure of the colour fields around the static charges is reported. We find that the large cancellations between the electric and magnetic energy densities lead to a narrow tube.
121664310
Energy and action of the colour fields around static quarks
Abstract Results on the profiles of the confining tube in the energy and action densities are discussed. Lattice sum rules are tested in detail.
16267009
Structure of Abrikosov vortices in SU(2) lattice gauge theory
Abstract We calculate the electric flux and magnetic monopole current distribution in the presence of a static quark-antiquark pair of SU(2) lattice gauge theory in the maximal Abelian gauge. The current distribution confines the flux in a dual Abrikosov vortex whose core size is comparable to the flux penetration depth. The observed structure is described by a dual Ginzburg-Landau model.
45414206
Measurement of the penetration depth and coherence length in U(1) and SU(2) dual Abrikosov vortices
Abstract We calculate the electric field and the curl of the magnetic monopole current for U(1) and for SU(2) in the maximal Abelian gauge in the mid-plane between a quark antiquark pair. The results can be understood as a dual Abrikosov vortex in the Ginzburg-Landau theory.
118798864
Monopoles and Confinement in Lattice-Gauge Theory.
A C K N O W LED G EM ENTS I am indebted to my advisor, R ichard H aym aker, for his guidance, pa­ tience and encouragem ent during this p ro ject. I am happy to thank him for m any hours of fruitful discussions, for m uch help w ith program m ing, and for taking a lot of trouble to help me gain an appreciation of particle physics in general. I am grateful for his support in encouraging me to a tten d various conferences and sum m er schools, and in giving me the opportun ity to present talks. I am also happy to thank our collaborator, D ana Browne for encour­ agem ent and advice, for being very generous w ith his time, for invaluable help w ith this p ro ject, and also for helping me w ith program m ing, w riting papers, and Tq X . I am also glad to acknowledge useful discussions and help from Chen-H an Lee. I would also like to thank my friends C hristopher C hapm an, Shyamoli C haudhuri, C h itra Guruswamy, Ja i Won Kim, Evan M auceli, Ying Cai Peng, Vijay Poduri, Hossein Sadeghpour, Z ahra Sadeghpour, Jyo tsna V ijapurkar. Bing Yu, and Lijun Zhang, for the ir help and support. M ost of all, I am indebted to my family, w ithout whose support and encouragem ent this work would not have been possible. This work was done on the Physics SUN cluster (LEQSF(90-92)-ENH-12) and on the IBM 3090.
121208723
Profiles of the confining tube
Abstract Progress in studying colour fields generated by static sources in quenched and unquenched QCD is reported.
115683962
Unveiling the population of high-redshift radio galaxies using centimeter GMRT survey
Ultra Steep Spectrum (USS) radio sources are one of the efficient tracers of High Redshift Radio Galaxies (HzRGs). To search for HzRGs candidates, we investigate properties of a large sample of faint USS sources derived from our deep 325 MHz GMRT observations combined with 1.4 GHz VLA data on the two subfields (i.e., VLA-VIMOS VLT Deep Survey (VVDS) and Subaru X-ray Deep Field (SXDF)) in the XMM-LSS field. The available redshift estimates show that majority of our USS sample sources are at higher redshifts with the median redshifts ~ 1.18 and ~ 1.57 in the VLA-VVDS and SXDF fields. In the VLA-VVDS field, ~ 20% of USS sources lack the redshift estimates as well as the detection in the deep optical, IR surveys, and thus these sources may be considered as potential high-z candidates. The radio luminosity distributions suggest that a substantial fraction (~ 40%) of our USS sample sources are radio-loud sources, distributed over redshifts ~ 0.5 to 4.
1626474
Maximally realistic causal quantum mechanics
Abstract We present a causal Hamiltonian quantum mechanics in 2 n -dimensional phase space which is more realistic than de Broglie–Bohm mechanics. The positive definite phase space density reproduces as marginals the correct quantum probability densities of n +1 different complete commuting sets of observables e.g. positions, momenta and n −1 other sets.
119959917
Bounds on elastic absorptive parts
We reduce the general problem of obtaining bounds on elastic absorptive parts of a scattering amplitude subject to unitarity restrictions and any number of constraints involving partial wave amplitudes linearly to a form where it can be directly applied to any such problem. A series of bounds on absorptive parts for positive momentum transfer square t, within the Lehmann-Martin ellipse, is derived. These involve a knowledge of the first few momentum transfer derivatives of the absorptive part in the forward direction, i.e., t = 0. Upper and lower bounds on the higher t-derivatives of the absorptive part at t = 0 are also given.
121168534
Fractionally charged non-leaking dyons and fermions in a bag
We consider a fermion of chargee confined to a spherical bag with a Dirac monopole of strengthg at its centre. We find that the boundary conditions making the lowest angular momentum hamiltonian self-adjoint are characterized by a unitary matrixU, and the corresponding vacuum charge has a fractional part 2|eg|α/π where detU = -exp (2iα). Boundary conditions for conservation of helicity,CP, CT andPT are displayed. We demonstrate the possibility of a fractionally charged dyon whose interaction with a fermion conserves helicity. We also show thatthe simultaneous validity of helicity, CP, CT and PT requires integer vacuum charge.
117752946
Study of neutron-induced background and its effect on the search of 0$\nu\beta\beta$ decay in $\rm^{124}Sn$
Neutron-induced background has been studied in various components of the TIN.TIN detector, which is under development for the search of Neutrinoless Double Beta Decay in $\rm^{124}Sn$. Fast neutron flux $\sim10^{6}~n~cm^{-2}s^{-1}$ covering a broad energy range ($ \sim0.1$ to $ \sim18$~MeV) was generated using $^{9}Be(p,n)^{9}B$ reaction. In addition, reactions with quasi-monoenergetic neutrons were also studied using $^{7}Li(p,n)^{7}Be$ reaction. Among the different cryogenic support structures studied, Teflon is found to be preferable compared to Torlon as there is no high energy gamma background ($E_\gamma >$ 1 MeV). Contribution of neutron-induced reactions in $\rm ^{nat, 124} $Sn from other Sn isotopes (A = 112 -- 122) in the energy region of interest, namely, around the $Q_{\beta\beta}$ of $\rm^{124}Sn$ ($E \sim$ 2.293 MeV), is also investigated.