Speaker
Pritam Nanda
(Saha institute of nuclear physics)
Description
We revisit the symmetries of an isolated horizon (IH), exploiting some freedom in the choice of intrinsic data. The supertranslations are realized as additional symmetries. Furthermore, it is shown that all smooth vector fields tangent to the cross sections are Hamiltonian. We show that joining two IHs which differ in these Hamiltonians and boundary data, under the action of a supertranslation, necessarily requires the inclusion of an intermediate phase which requires the inclusion of a stress-energy tensor. In this phase, the boundary is null and nonexpanding but not an IH and invariably leads to a violation of the dominant energy condition. The assumptions allow us to reconstruct the (classically) pathological stress-energy tensor also.
| Session | Formal Theory |
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Author
Pritam Nanda
(Saha institute of nuclear physics)
