194 research outputs found
Lattice electrons in constant magnetic field: Bethe like ansatz
We use the functional representation of Heisenberg-Weyl group and obtain
equation for the spectrum of the model, which is more complicated than Bethes
ones, but can be written explicitly through theta functions.Comment: 8 pages, LATE
Comparative Studies of Cross-border M&A and Greenfield Investments in Response to Changes in Tax Regulation and Administration of Host Economies
We study and compare the impact of tax indicators, described by Paying Taxes scores of Doing Business report, on two modes of FDI in equity capital- greenfield FDI and cross-border mergers and acquisitions (M&As). Then, we apply 25 percent improvement to each tax factor and evaluate this effect on inbound flow of FDI determinants. The study compares four methods-the ordinary least squares, random-effects, fixed-effects, and Hausman-Taylor models- applied to the panel data for one hundred sixty countries for the period from 2009 to 2017. The consummate range of Hausman-Taylor tools when applied to studies of panel datasets with time-varying, time-invariant and endogenous parameters of tax administration reveals the divergence among the factors appealing to M&A and greenfield investors. The study assesses the higher sensitivity of M&A to the factors of economic development, overall business friendliness and location of a potential host economy. The countries at the lower end of GDP per capita performance are more likely to attract foreign direct investments, if the message about the domestic reforms in tax regulations and administration targets greenfield investors
The Effects of Presumptive Methods of Taxation on Revenue Mobilization in the Value
Recent economic studies of presumptive taxation in the ECA region suggest negative effects of these tax modes on tax revenues mobilization. This study uses a three-stage methodology to estimate the effect of presumptive taxation on revenue mobilization for the VAT. First, we develop a new approach to estimate the true VAT potential tax base in an economy that includes presumptive taxation. Next, the paper assesses potential tax collections reflecting true taxable capacity and a tax effort index, suggesting the presence of inefficiencies in the tax system and sizable tax avoidance. Second, we use regression analysis to test for the scale of impact of presumptive taxation on VAT collections. Third, we use vector autoregression analysis (VAR) to analyze the bidirectional effect of VAT actual and potential collection and presumptive taxation modes in short and long-term perspective. For contrasting the variance of impact of presumptive taxation on VAT mobilization we use two different presumptive tax modes, simplified tax and presumptive payments, with different tax structures. We use data for Armenia for the numerical application of the analysis. Our findings reveal that, indeed, Armenia’s simplified tax has a significant distorting and diminishing effect on VAT collections. Meanwhile, presumptive payments have a positive impact on VAT mobilization
Can Tax Regulation and Administration Practices Impact Foreign Direct Investments?
We examine the impacts of the indicators contributing to the effectiveness of tax regulation performances described by the topic of Paying Taxes in Doing Business report on the foreign direct investment inflows. We further focus on the effects the same determinants have on two different modes of FDI: greenfield FDI and cross-border mergers and acquisitions (M&As). This study uses panel data of one hundred fifty-six countries across all regions. The methodology applies random effects econometric tool to conduct a global investigation on the relation between the level of tax regulation and administration performances and the types of FDI, with further more focalized extraction of information applied to seventeen geographic regions. The main findings suggest that while the high degree model does not detect strong significant relations between factors of tax administration and types of FDI; however, a more scrupulous analysis by regions reveals strong correlations between effective tax regulations and levels of foreign direct investment flows to host economies. Additionally, the study suggests that differentiated factors of tax administration and regulation tools should be considered due to the regional affiliation of a potential host economy to drive foreign investments. The results of the study can be used as a guidance for country administrators in assessment of those specific determinants that could lead to improvement of targeted types of FDI in their specific country as part of a given region. Also, the investors may find the results useful for the evaluation of tax regulations and administration performances in potential host countries in terms of targeted investments
Localization-delocalization transition in the quasi-one-dimensional ladder chain with correlated disorder
The generalization of the dimer model on a two-leg ladder is defined and
investigated both, analytically and numerically. For the closed system we
calculate the Landauer resistance analytically and found the presence of the
point of delocalization at the band center which is confirmed by the numerical
calculations of the Lyapunov exponent. We calculate also analytically the
localization length index and present the numerical investigations of the
density of states (DOS). For the open counterpart of this model the
distribution of the Wigner delay times is calculated numerically. It is shown
how the localization-delocalization transition manifest itself in the behavior
of the distribution.Comment: 9 pages, 10 figures, Revte
Composite fermion state of spin-orbit coupled bosons
We consider spinor Bose gas with the isotropic Rashba spin-orbit coupling in
2D. We argue that at low density its groundstate is a composite fermion state
with a Chern-Simons gauge field and filling factor one. The chemical potential
of such a state scales with the density as \mu \propto n^{3/2}. This is a lower
energy per particle than \mu \propto n for the earlier suggested groundstate
candidates: a condensate with broken time-reversal symmetry and a spin density
wave state.Comment: 15 pages, 7 figures, Revte
Grassmann-Gaussian integrals and generalized star products
In quantum scattering on networks there is a non-linear composition rule for
on-shell scattering matrices which serves as a replacement for the
multiplicative rule of transfer matrices valid in other physical contexts. In
this article, we show how this composition rule is obtained using Berezin
integration theory with Grassmann variables.Comment: 14 pages, 2 figures. In memory of Al.B. Zamolodichiko
Perturbation theory in radial quantization approach and the expectation values of exponential fields in sine-Gordon model
A perturbation theory for Massive Thirring Model (MTM) in radial quantization
approach is developed. Investigation of the twisted sector in this theory
allows us to calculate the vacuum expectation values of exponential fields of the sine-Gordon theory in first order over Massive Thirring
Models coupling constant. It appears that the apparent difficulty in radial
quantization of massive theories, namely the explicite ''time'' dependence of
the Hamiltonian, may be successfully overcome. The result we have obtained
agrees with the exact formula conjectured by Lukyanov and Zamolodchikov and
coincides with the analogous calculations recently carried out in dual angular
quantization approach by one of the authors.Comment: 16 pages, no figures, LaTe
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