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The stochastic relaxion
Published 2023-06-01“…We investigate the regime where the relaxion is subject to large fluctuations during inflation. The stochastic dynamics of the relaxion is described by means of the Fokker-Planck formalism. …”
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Stochastic Volatility.
Published 2005“…Stochastic volatility (SV) is the main concept used in the elds of nancial economics and mathematical nance to deal with the endemic time-varying volatility and codependence found in nancial markets. …”
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Stochastic Runge-Kutta method for stochastic delay differential equations /
Published 2012Subjects: “…Stochastic differential equations…”
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Stochastic Runge-Kutta method for stochastic delay differential equations /
Published 2012Subjects: “…Stochastic differential equations…”
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Stochastic Runge-Kutta method for stochastic delay differential equations
Published 2012“…Random effect and time delay are inherent properties of many real phenomena around us, hence it is required to model the system via stochastic delay differential equations(SDDEs). However,the complexity arises due to the presence of both randomness and time delay.The analytical solution of SDDEs is hard to be found.In such a case, a numerical method provides a way to solve the problem.Nevertheless, due to the lacking of numerical methods available for solving.SDDEs,a wide range of researchers among the mathematicians and scientists have not incorporated the important features of the real phenomena,which include randomness and time delay in modeling the system.Hence,this research aims to generalize the convergence proof of numerical methods for SDDEs when the drift and diffusion functions are Taylor expansion and to develop a stochastic Runge—Kutta for solving SDDEs Motivated by the relative paucity of numerical methods accessible in simulating the strong solution of SDDEs,the numerical schemes developed in this research is hoped to bridge the gap between the evolution of numerical methods in ordinary differential equations(ODEs), delay differential equations (DDEs),stochastic differential equations(SDEs)and SDDEs.The extension of numerical methods of SDDEs is far from complete.Rate of convergence of recent numerical methods available in approximating the solution of SDDEs only reached the order of 1.0. …”
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Estimating Stochastic Volatility under the Assumption of Stochastic Volatility of Volatility
Published 2020-04-01Subjects: Get full text
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An extension of the stochastic sewing lemma and applications to fractional stochastic calculus
Published 2024-01-01“…We give an extension of Lê’s stochastic sewing lemma. The stochastic sewing lemma proves convergence in $L_m$ of Riemann type sums $\sum _{[s,t] \in \pi } A_{s,t}$ for an adapted two-parameter stochastic process A, under certain conditions on the moments of $A_{s,t}$ and of conditional expectations of $A_{s,t}$ given $\mathcal F_s$ . …”
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Real Option Valuation with Stochastic Interest Rate and Stochastic Volatility
Published 2019-11-01“…Keyword: real options, stochastic interest rate model, stochastic volatility model, simulation…”
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Stochastic evolution equations for large portfolios of stochastic volatility models
Published 2017“…We consider a large market model of defaultable assets in which the asset price processes are modelled as Heston-type stochastic volatility models with default upon hitting a lower boundary. …”
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ocean windspeeds forecast by Gaidai multivariate risk assessment method, utilizing deconvolution scheme
Published 2024-09-01Subjects: Get full text
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Probabilistic Approach for Determination of Thick Pressure Vessels Reliability
Published 2024-01-01Subjects: Get full text
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Water-energy-food nexus and its stochastic dynamics: case study Greece
Published 2024-12-01Subjects: Get full text
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Fifth-stage stochastic runge-kutta method for stochastic differential equations
Published 2018“…Hence, models for these systems are required via stochastic differential equations (SDEs). However, it is often difficult to find analytical solutions of SDEs. …”
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2-stage Stochastic Runge-Kutta for Stochastic Delay Differential Equations
Published 2014“…This paper proposes a newly developed one-step derivative-free method, that is 2-stage stochastic Runge-Kutta (SRK2) to approximate the solution of stochastic delay differential equations (SDDEs) with a constant time lag, r 0. …”
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Conference or Workshop Item