Suppose that interest rate r(t) follows some short-rate models, say Vasicek, so thatdr=a(b−r)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): σ22∂2P∂r2+a(b−r)∂P∂r+∂P∂t−rP=0
with boundary condition P(r,T)=1. Note that we could write P(r,t)=EQ[e−∫Ttr(u)du|Ft] for all t≤T.
Trying to generalize, for some smooth condition of h(r,T) depending only on r at T: If we define Q(r,t)=EQ[e−∫Ttr(u)duh(r,T)|Ft] for all t≤T, does the following PDE σ22∂2Q∂r2+a(b−r)∂Q∂r+∂Q∂t−rQ=0
with boundary condition Q(r,T)=h(r,T) hold?
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