Algebraic K-theory, A^1-homotopy and Riemann-Roch theorems

In this article, we show that the combination of the constructions done in SGA 6 and the A^1-homotopy theory naturally leads to results on higher algebraic K-theory. This applies to the operations on algebraic K-theory, Chern characters and Riemann-Roch theorems.Comment: 39 pages; minor changes (typos, references

How growth and location are sensitive to transport and telecommunication infrastructures?

This paper is an extension of the new economic geography and growth model of Martin (1999) which proposes an interesting framework to analyze the effects of the european regional policy. We introduce imperfect interregional knowledge spillovers in this framework which are diffused by two infrastructures : transport and telecommunication infrastructures. If an investment in transport infrastructures may be at the origin of a centrifugal effect through non market interactions, we show that only a policy improving telecommunication can reduce regional inequalities and attain higher aggregate growth rate.Growth, Geography, Public policies

Technical change and agglomeration

Although economic historians consider technical change to be a significant factor explaining the evolution of the spatial organization of an economy, economic geography still fails to address this important issue. By developing a simple two-region general equilibrium model under monopolistic competition, we show that agglomeration is triggered by technological progress shifting production towards more skill intensive techniques.Skill-biased change economic geography

Public Good Spillovers and Location of Firms

Impact of positive public good spillovers on international capital tax competition in a spatial economy with two countries imperfectly integrated and with different levels of productivity.Localisation des entreprises; Economie internationale; Externalités; Concurrence fiscale

Coleman maps and the p-adic regulator

This paper is a sequel to our earlier paper "Wach modules and Iwasawa theory for modular forms" (arXiv: 0912.1263), where we defined a family of Coleman maps for a crystalline representation of the Galois group of Qp with nonnegative Hodge-Tate weights. In this paper, we study these Coleman maps using Perrin-Riou's p-adic regulator L_V. Denote by H(\Gamma) the algebra of Qp-valued distributions on \Gamma = Gal(Qp(\mu (p^\infty) / Qp). Our first result determines the H(\Gamma)-elementary divisors of the quotient of D_{cris}(V) \otimes H(\Gamma) by the H(\Gamma)-submodule generated by (\phi * N(V))^{\psi = 0}, where N(V) is the Wach module of V. By comparing the determinant of this map with that of L_V (which can be computed via Perrin-Riou's explicit reciprocity law), we obtain a precise description of the images of the Coleman maps. In the case when V arises from a modular form, we get some stronger results about the integral Coleman maps, and we can remove many technical assumptions that were required in our previous work in order to reformulate Kato's main conjecture in terms of cotorsion Selmer groups and bounded p-adic L-functions.Comment: 27 page

Absolute accuracy in membrane-based ac nanocalorimetry

To achieve accurate results in nanocalorimetry a detailed analysis and understanding of the behavior of the calorimetric system is required. There are especially two system-related aspects that should be taken in consideration: the properties of the empty cell and the effect of the thermal link between sample and cell. Here we study these two aspects for a membrane-based system where heater and thermometer are both in good contact with each other and the center of the membrane. Practical, analytical expressions for describing the frequency dependence of heat capacity, thermal conductance, and temperature oscillation of the system are formulated and compared with measurements and numerical simulations. We finally discuss the experimental conditions for an optimal working frequency, where high resolution and good absolute accuracy are combined

How labor market rigidities shape business taxation in a global economy?

We investigate the impact of trade liberalization upon the taxation of capital within a context of labor market rigidities. Using a model of trade and location, we show that labor market imperfections not only strengthen tax competition but also affect the relationship between trade integration and tax policies. Capital taxation follows a J-shaped relationship with trade costs when labor markets are flexible, whereas it may increase with falling trade costs in the presence of trade unions acting as Stackelberg leaders or playing simultaneously with governments. In addition, we analyze the outcome which arises from di§erences between the various countries' labor market institutions. Trade liberalization reduces the international differences in wage and capital taxation, making the unionized country more attractive.Tax competition; unions; capital mobility; trade integration

Trade integration and the destination of subsidies

We build a model of trade and location with two countries which differ with respect to their level of productivity. Public spending has two possible allocations: a direct subsidy to immobile households or a wage subsidy to mobile firms. We show that firms receive a lower net tax subsidy in the high-productivity country than in the low productivity one. Despite this less generous policy, the former country can host a larger share of firms, so that its total spending for firms can be higher than in the low productivity country when trade costs are low enough. The welfare analysis suggest that the second-best optimum requires an increase in the subsidy to households in both countries when the economies are weakly integrated or the productivity gap is low or the share of capital incomes redistributed outside the two economies is high.trade integration, firm location, public expenditure composition