Wednesday, April 4, 2018

stochastic processes - PDE for Pricing Interest Rate Derivatives


Suppose that interest rate r(t) follows some short-rate models, say Vasicek, so thatdr=a(br)dt+σdZ, with constants a,b,σ.



It is well known that the price of zero-coupon bond P(r,t) at current time t maturing at T with face value 1 follows (for example, see McDonald's Derivatives Markets, 3rd ed, p.758): σ222Pr2+a(br)Pr+PtrP=0

with boundary condition P(r,T)=1. Note that we could write P(r,t)=EQ[eTtr(u)du|Ft] for all tT.


Trying to generalize, for some smooth condition of h(r,T) depending only on r at T: If we define Q(r,t)=EQ[eTtr(u)duh(r,T)|Ft] for all tT, does the following PDE σ222Qr2+a(br)Qr+QtrQ=0

with boundary condition Q(r,T)=h(r,T) hold?




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