Results 31 to 40 of about 618 (129)
The Landscape, the Swampland and the Era of Precision Cosmology
Fortschritte der Physik, Volume 67, Issue 1-2, January-February 2019., 2019 Abstract We review the advanced version of the KKLT construction and pure de Sitter supergravity, involving a nilpotent multiplet, with regard to various conjectures that de Sitter state cannot exist in string theory. We explain why we consider these conjectures problematic and not well motivated, and why the recently proposed alternative string theory
Yashar Akrami +3 more
wiley +1 more source
Non-perturbative Temperature Instabilities in N=4 Strings [PDF]
, 1999 We derive a universal thermal effective potential, which describes all possible high-temperature instabilities of the known N=4 superstrings, using the properties of gauged N=4 supergravity.
Kounnas, Costas +2 more
core +1 more source
On the existence of heterotic-string and type-II-superstring field theory vertices
Journal of Geometry and PhysicsWe consider two problems associated to the space of Riemann surfaces that are closely related to string theory. We first consider the problem of existence of heterotic-string and type-II-superstring field theory vertices in the product of spaces of bordered surfaces parameterizing left- and right-moving sectors of these theories. It turns out that this
Seyed Faroogh Moosavian, Yehao Zhou
openaire +2 more sources
CCNV Space‐Times as Potential Supergravity Solutions
Advances in Mathematical Physics, Volume 2018, Issue 1, 2018., 2018 It is of interest to study supergravity solutions preserving a nonminimal fraction of supersymmetries. A necessary condition for supersymmetry to be preserved is that the space‐time admits a Killing spinor and hence a null or time‐like Killing vector field.
A. Coley +3 more
wiley +1 more source
Calabi‐Yau Manifolds, Hermitian Yang‐Mills Instantons, and Mirror Symmetry
Advances in High Energy Physics, Volume 2017, Issue 1, 2017., 2017 We address the issue of why Calabi‐Yau manifolds exist with a mirror pair. We observe that the irreducible spinor representation of the Lorentz group Spin(6) requires us to consider the vector spaces of two forms and four forms on an equal footing. The doubling of the two‐form vector space due to the Hodge duality doubles the variety of six‐dimensional
Hyun Seok Yang +2 more
wiley +1 more source
New BPS states from bosonic/heterotic duality
Journal of High Energy PhysicsIn this paper, we consider the recently proposed bosonic/heterotic duality that relates the heterotic superstrings to the noncritical bosonic string. Although the latter is nonsupersymmetric, it can be viewed as pseudo-supersymmetric in that the theory ...
Kai-Peng Lu, H. Lü, Liang Ma
doaj +1 more source
Pair production and gravity as the weakest force
Journal of High Energy Physics, 2020 The Weak Gravity Conjecture (WGC) is usually formulated in terms of the stability of extremal black-holes or in terms of long distance Coulomb/Newton potentials.
Eduardo Gonzalo, Luis E. Ibáñez
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Fortschritte der Physik, Volume 73, Issue 9-10, October 2025.Abstract The unification of conformal and fuzzy gravities with internal interactions is based on the facts that i) the tangent group of a curved manifold and the manifold itself do not necessarily have the same dimensions and ii) both gravitational theories considered here have been formulated in a gauge theoretic way.
Gregory Patellis +3 more
wiley +1 more source
Advances in High Energy Physics, Volume 2013, Issue 1, 2013., 2013 The 4D Kerr geometry displays many wonderful relations with quantum world and, in particular, with superstring theory. The lightlike structure of fields near the Kerr singular ring is similar to the structure of Sen solution for a closed heterotic string.
Alexander Burinskii, P. Bussey
wiley +1 more source
Quantization of heterotic strings in a Goedel/Anti de Sitter spacetime and chronology protection
, 2004 23 pages; v2: minor changes, references added, version to appear in JHEPWe show that a Goedel-like deformation of AdS3 in heterotic string theory can be realized as an exact string background.
Israël, Dan
core +2 more sources