6,150 research outputs found
The McCarran-Walter Act:A Contradictory Legacy on Race, Quotas, and Ideology
The McCarran-Walter Act of 1952 ended the blanket exclusion of immigrants based on race and created the foundation for current immigration law, but imposed a racialized immigration quota system and new ideological grounds for exclusion
Percolation line of stable clusters in supercritical fluids
We predict that self-bound clusters of particles exist in the supercritical
phase of simple fluids. These clusters, whose internal temperature is lower
than the global temperature of the system, define a percolation line that
starts at the critical point. This line should be physically observable.
Possible experiments showing the validity of these predictions are discussed.Comment: 5 pages, 3 figures, corrected some typo
A note on market completeness with American put options
We consider a non necessarily complete financial market with one bond and one risky asset, whose price process is modelled by a suitably integrable, strictly positive, cà dlà g process over . Every option price is defined as the conditional expectation under a given equivalent (true) martingale measure , the same for all options. We show that every positive contingent claim on can be approximately replicated (in -sense) by investing dynamically in the underlying and statically in all American put options (of every strike price and with the same maturity ). We also provide a counter-example to static hedging with European call options of all strike prices and all maturities .
Evolution of Complexity in Out-of-Equilibrium Systems by Time-Resolved or Space-Resolved Synchrotron Radiation Techniques
Out-of-equilibrium phenomena are attracting high interest in physics,
materials science, chemistry and life sciences. In this state, the study of
structural fluctuations at different length scales in time and space are
necessary to achieve significant advances in the understanding of
structure-functionality relationship. The visualization of patterns arising
from spatiotemporal fluctuations is nowadays possible thanks to new advances in
X-ray instrumentation development that combine high resolution both in space
and in time. We present novel experimental approaches using high brilliance
synchrotron radiation sources, fast detectors and focusing optics, joint with
advanced data analysis based on automated statistical, mathematical and imaging
processing tools. This approach has been used to investigate structural
fluctuations in out-of-equilibrium systems in the novel field of inhomogeneous
quantum complex matter at the crossing point of technology, physics and
biology. In particular, we discuss how nanoscale complexity controls the
emergence of high temperature superconductivity (HTS), myelin functionality and
formation of hybrid organic-inorganic nanostructures. The emergent complex
geometries, opening novel venues to quantum technology and to development of
quantum physics of living systems, are discussedComment: 18 pages, 7 figure
Multivariate utility maximization with proportional transaction costs and random endowment
In this paper we deal with a utility maximization problem at finite horizon on a continuous-time market with conical (and time varying) constraints (particularly suited to model a currency market with proportional transaction costs). In particular, we extend the results in Campi and Owen (2011) to the situation where the agent is initially endowed with a random and possibly unbounded quantity of assets. We start by studying some basic properties of the value function (which is now defined on a space of random variables), then we dualize the problem following some convex analysis techniques which have proven very useful in this field of research. We finally prove the existence of a solution to the dual and (under an additional boundedness assumption on the endowment) to the primal problem. The last section of the paper is devoted to an application of our results to utility indifference pricing.Transaction costs ; Foreign exchange market ; Multivariate utility function ; Optimal portfolio ; Duality theory ; Random endowment ; Utility-based pricing
Close-Form Pricing of Benchmark Equity Default Swaps Under the CEV Assumption
Equity Default Swaps are new equity derivatives designed as a product for credit investors.Equipped with a novel pricing result, we provide closedform values that give an analytic contribution to the viability of cross-asset trading related to credit risk.Cross-Asset Trading of Credit Risk;Constant-Elasticity-of-Variance (CEV) Diffusion
On the spot-futures no-arbitrage relations in commodity markets
In commodity markets the convergence of futures towards spot prices, at the
expiration of the contract, is usually justified by no-arbitrage arguments. In
this article, we propose an alternative approach that relies on the expected
profit maximization problem of an agent, producing and storing a commodity
while trading in the associated futures contracts. In this framework, the
relation between the spot and the futures prices holds through the
well-posedness of the maximization problem. We show that the futures price can
still be seen as the risk-neutral expectation of the spot price at maturity and
we propose an explicit formula for the forward volatility. Moreover, we provide
an heuristic analysis of the optimal solution for the
production/storage/trading problem, in a Markovian setting. This approach is
particularly interesting in the case of energy commodities, like electricity:
this framework indeed remains suitable for commodities characterized by
storability constraints, when standard no-arbitrage arguments cannot be safely
applied
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