Search Results

Freezing of Moduli by N=2 Dyons [ Abstract, 47 Cites, , Pre-print PDF ]

47Kallosh, Renata; Shmakova, Marina; Wong, Wing Kai (1996-07-10) In Physical Review D 54 6284 (1996)

In N=2 ungauged supergravity we have found the most general double-extreme dyonic black holes with arbitrary number n_v of constant vector multiplets and n_h of constant hypermultiplets. They are double-extreme: 1) supersymmetric with coinciding horizons, 2) the mass for a given set of quantized charges ... Comment: 23 pages, no figures, ref. added, minor corrections, version to appear in Phys. Rev. D

Exact Duality in String Effective Action [ Abstract, 44 Cites, , Pre-print PDF ]

44Bergshoeff, Eric; Entrop, Ingeborg; Kallosh, Renata (1994-01-06) In Physical Review D 49 6663 (1994)

We formulate sigma-model duality transformations in terms of spin connection. This allows to investigate the symmetry of the string action including higher order α' corrections. An important feature of the new duality transformations is a simple homogeneous transformation rule of the spin connection ( ... Comment: 23 p, Stanford University preprint SU-ITP-93-37 (some references added)

Brane World Sum Rules [ Abstract, 44 Cites, , Pre-print PDF ]

44Gibbons, Gary; Kallosh, Renata; Linde, Andrei (2000-11-24) In JHEP 0101 022 (2001)

A set of consistency conditions is derived from Einstein equations for brane world scenarios with a spatially periodic internal space. In particular, the sum of the total tension of the flat branes and the non-negative integral of the gradient energy of the bulk scalars must vanish. This constraint ... Comment: 13 pages, JHEP, references added

M/String Theory, S-branes and Accelerating Universe [ Abstract, 43 Cites, , Pre-print PDF ]

43Gutperle, Michael; Kallosh, Renata; Linde, Andrei (2003-04-28) In JCAP 0307 001 (2003)

Recently it was observed that the hyperbolic compactification of M/string theory related to S-branes may lead to a transient period of acceleration of the universe. We study time evolution of the corresponding effective 4d cosmological model supplemented by cold dark matter and show that it is mar ... Comment: 8 pages, 5 figs, significant modifications are made

Superconformal Actions in Killing Gauge [ Abstract, 41 Cites, , Pre-print PDF ]

41Kallosh, Renata (1998-07-28) oai:arXiv.org:hep-th/9807206

The classical superconformal actions of branes in adS superspaces have a closed form depending on a matrix M² quadratic in fermions, as found in hep-th/9805217. One can gauge-fix the local κ-symmetry using the Killing spinors of the brane in the bulk. We show that in such gauges the superconformal ... Comment: 9 pages, Latex

Supersymmetric Multiple Basin Attractors [ Abstract, 40 Cites, , Pre-print PDF ]

40Kallosh, Renata; Linde, Andrei; Shmakova, Marina (1999-10-02) In JHEP 9911 010 (1999)

We explain that supersymmetric attractors in general have several critical points due to the algebraic nature of the stabilization equations. We show that the critical values of the cosmological constant of the adS₅ vacua are given by the topological (moduli independent) formulae analogous to the ... Comment: 14 pages, 1 fig, JHEP, added proof of positivity of vector metric at critical points, analysis of interpolating solutions, and refs

The Non-BPS Black Hole Attractor Equation [ Abstract, 39 Cites, , Pre-print PDF ]

39Kallosh, Renata; Sivanandam, Navin; Soroush, Masoud (2006-01-31) In JHEP 0603 060 (2006)

We study the attractor mechanism for extremal non-BPS black holes with an infinite throat near horizon geometry, developing, as we do so, a physical argument as to why such a mechanism does not exist in non-extremal cases. We present a detailed derivation of the non-supersymmetric attractor equation. ... Comment: 32 Pages, 2 Figures, LaTeX; v2: typos corrected, references added

Observational Bounds on Cosmic Doomsday [ Abstract, 37 Cites, , Pre-print PDF ]

37Kallosh, Renata; Kratochvil, Jan; Linde, Andrei et al (2003-07-10) In JCAP 0310 015 (2003)

Recently it was found, in a broad class of models, that the dark energy density may change its sign during the evolution of the universe. This may lead to a global collapse of the universe within the time t_c ~ 10¹⁰-10¹¹ years. Our goal is to find what bounds on the future lifetime of the universe can ... Comment: 11 pages, 6 figures, revtex4

Supersymmetric Rotating Black Holes and Attractors [ Abstract, 35 Cites, , Pre-print PDF ]

35Kallosh, Renata; Rajaraman, Arvind; Wong, Wing Kai (1996-11-13) In Physical Review D 55 3246 (1997)

Five-dimensional stringy rotating black holes are embedded into N=2 supergravity interacting with one vector multiplet. The existence of an unbroken supersymmetry of the rotating solution is proved directly by solving the Killing spinor equations. The asymptotic enhancement of supersymmetry near the ... Comment: 7 pages,latex

Covariant Quantization of D-branes [ Abstract, 34 Cites, , Pre-print PDF ]

34Kallosh, Renata (1997-05-08) In Physical Review D 56 3515 (1997)

We have found that kappa-symmetry allows a covariant quantization provided the ground state of the theory is strictly massive. For D-p-branes a Hamiltonian analysis is performed to explain the existence of a manifestly supersymmetric and Lorentz covariant description of the BPS states of the theory. ... Comment: 16 pages, no figures