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13 papers · 1 filter
Log-space Algorithms for Paths and Matchings in k-trees
Bireswar Das, Samir Datta, Prajakta Nimbhorkar
Reachability and shortest path problems are NL-complete for general graphs. They are known to be in L for graphs of tree-width 2 [JT07]. However, for graphs of tree-width larger th…
On nonsupersymmetric $\BC^4/\BZ_N$, tachyons, terminal singularities and flips
K. Narayan
We investigate nonsupersymmetric $\BC^4/\BZ_N$ orbifold singularities using their description in terms of the string worldsheet conformal field theory and its close relation with t…
Neutrino Condensate as Origin of Dark Energy
Jitesh R. Bhatt, Bipin R. Desai, Ernest Ma +2
We propose a new solution to the origin of dark energy. We suggest that it was created dynamically from the condensate of a singlet neutrino at a late epoch of the early Universe t…
Null cosmological singularities and free strings
K. Narayan
We continue exploring free strings in the background of null Kasner-like cosmological singularities, following arXiv:0904.4532 [hep-th]. We study the free string Schrodinger wavefu…
Locally compact abelian groups with symplectic self-duality
Amritanshu Prasad, Ilya Shapiro, M. K. Vemuri
Is every locally compact abelian group which admits a symplectic self-duality isomorphic to the product of a locally compact abelian group and its Pontryagin dual? Several sufficie…
Toeplitz CAR flows and type I factorizations
Masaki Izumi, R. Srinivasan
Toeplitz CAR flows are a class of E_0-semigroups including the first type III example constructed by R. T. Powers. We show that the Toeplitz CAR flows contain uncountably many mutu…