Results 41 to 50 of about 5,303 (156)
Theta expansion of first massive vertex operator in pure spinor
Journal of High Energy Physics, 2018 We provide the covariant superspace equations that are sufficient to determine the complete θ expansion of the vertex operator of the open string massive states with (mass)2 = 1/α′ in pure spinor formalism of superstring theory.
Subhroneel Chakrabarti +2 more
doaj +1 more source
Eleven Dimensional Origin of String/String Duality: A One Loop Test [PDF]
, 1995 Membrane/fivebrane duality in D=11 implies Type IIA string/Type IIA fivebrane duality in D=10, which in turn implies Type IIA string/heterotic string duality in D=6.
Duff, M. J., Liu, James T., Minasian, R.
core +3 more sources
A Note on the dS Swampland Conjecture, Non‐BPS Branes and K‐Theory
Fortschritte der Physik, Volume 67, Issue 11, November 2019., 2019 Abstract We point out that the de Sitter swampland conjecture would be falsified if classical fluxed Type IIA orientifold vacua with a single non‐BPS D7‐brane were indeed part of the string theory landscape. In other words, the dS swampland conjecture implies the cancellation of K‐theory charges on a compact space.
Ralph Blumenhagen +2 more
wiley +1 more source
Journal of High Energy Physics, 2023 The α ′-expansion of string theory provides a rich set of higher-dimension operators, indexed by ζ values, which can be used to study color-kinematics duality and the double copy. These two powerful properties, actually first noticed in tree-level string
Alex Edison, Micah Tegevi
doaj +1 more source
Dilaton vertices of the closed superstring and the heterotic string
Physics Letters B, 1988 Abstract BRST - and conformally invariant dilaton vertices of the closed superstring and the heterotic string are constructed, whose counter terms are consistent with the dilaton terms introduced in the non-linear sigma model approach of string theory.
openaire +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.
I. Antoniadis +2 more
semanticscholar +1 more source
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
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
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
doaj +1 more source