scholarly journals Nontrival cosmological constant in brane worlds with unorthodox lagrangians

2011 ◽  
Vol 2011 (07) ◽  
pp. 007-007 ◽  
Author(s):  
Stefan Förste ◽  
Hans Peter Nilles ◽  
Ivonne Zavala
Keyword(s):  
Cosmological Constant ◽  
Brane Worlds

scholarly journals de Sitter in non-supersymmetric string theories: no-go theorems and brane-worlds

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Ivano Basile ◽  
Stefano Lanza
Keyword(s):  
Flux Compactifications ◽  
Cosmological Constant ◽  
Dimensional Reduction ◽  
Brane World ◽  
De Sitter ◽  
Top Down ◽  
Brane Worlds ◽  
Concrete Realization ◽  
String Models ◽  
String Theories

Abstract We study de Sitter configurations in ten-dimensional string models where supersymmetry is either absent or broken at the string scale. To this end, we derive expressions for the cosmological constant in general warped flux compactifications with localized sources, which yield no-go theorems that extend previous works on supersymmetric cases. We frame our results within a dimensional reduction and connect them to a number of Swampland conjectures, corroborating them further in the absence of supersymmetry. Furthermore, we construct a top-down string embedding of de Sitter brane-world cosmologies within unstable anti-de Sitter landscapes, providing a concrete realization of a recently revisited proposal.

scholarly journals BLACK HOLES IN THE PRESENCE OF COSMOLOGICAL CONSTANT AND LARGE-N BRANE WORLD

2009 ◽  
Vol 24 (26) ◽  
pp. 2107-2118 ◽  
Author(s):  
MINGXING LUO ◽  
SIBO ZHENG
Keyword(s):  
Cosmological Constant ◽  
Higher Dimensions ◽  
Brane World ◽  
Gauge Fields ◽  
Brane Worlds ◽  
Gravitational Theories ◽  
Large N ◽  
Gauge Gravity ◽  
Gravity Duality ◽  
Constant Dilaton

Gravitational theories including negative cosmological constant, dilaton and gauge fields are explored in higher dimensions, in which black hole solutions are shown to exist and their asymptotic behaviors are obtained. Based on these solutions, effective Randall–Sundrum brane worlds are constructed. In the framework of gauge/gravity duality, effects from cosmological constant on the spectra of standard model fields on the branes are perturbatively calculated.

scholarly journals STRING THEORY AS A UNIVERSAL LANGUAGE

2001 ◽  
Vol 16 (28) ◽  
pp. 4511-4525 ◽  
Author(s):  
A. M. POLYAKOV
Keyword(s):  
String Theory ◽  
Cosmological Constant ◽  
Gauge Theories ◽  
Higher Dimensions ◽  
Brane Worlds ◽  
Open Strings ◽  
Universal Language ◽  
Conformal Gauge

This article, based on the Klein lecture, contains some new results and new speculations on various topics. They include discussion of open strings in the AdS space, unusual features of D-branes, conformal gauge theories in higher dimensions. We also comment on the infrared screening of the cosmological constant and on the ''brane worlds.''

scholarly journals STATE OF THE UNIFICATION ADDRESS

2001 ◽  
Vol 16 (supp01a) ◽  
pp. 77-91 ◽  
Author(s):  
M. J. DUFF
Keyword(s):  
String Theory ◽  
Cosmological Constant ◽  
Brane World ◽  
Brane Worlds ◽  
Self Tuning ◽  
M Theory

After reviewing how M-theory subsumes string theory, I report broadly on some new and interesting developments, focusing on the "brane world": circumventing no-go theorems for supersymmetric brane-worlds, complementarity of the Maldacena and Randall-Sundrum pictures; self-tuning of the cosmological constant. I conclude with the top ten unsolved problems.

scholarly journals Curved dilatonic brane worlds and the cosmological constant problem

2000 ◽  
Vol 17 (24) ◽  
pp. L163-L167 ◽  
Author(s):  
Natxo Alonso-Alberca ◽  
Bert Janssen ◽  
Pedro J Silva
Keyword(s):  
Cosmological Constant ◽  
Cosmological Constant Problem ◽  
Brane Worlds

scholarly journals D-BRANE WORLDS AND THE COSMOLOGICAL CONSTANT

2006 ◽  
Vol 21 (03) ◽  
pp. 213-229
Author(s):  
P. GUSIN ◽  
J. WARCZEWSKI
Keyword(s):  
Energy Density ◽  
Cosmological Constant ◽  
Perfect Fluid ◽  
Speed Of Sound ◽  
Energy Momentum Tensor ◽  
Momentum Tensor ◽  
Brane Worlds

The cosmological constant on a D-brane is analyzed. This D-brane is in the background produced by the p-brane solutions. The energy–momentum tensor in this model has been found and the form of the cosmological constant has been derived. This energy–momentum tensor is interpreted as an energy–momentum tensor for a perfect fluid on the D-brane. The energy density and the pressure for this fluid have been derived. As it turned out the pressure is negative but the speed of sound is real.

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