scholarly journals On first-order formalism in string theory

2006 ◽  
Vol 633 (2-3) ◽  
pp. 375-381 ◽  
Author(s):  
Andrei S. Losev ◽  
Andrei Marshakov ◽  
Anton M. Zeitlin
Keyword(s):  
String Theory ◽  
First Order

scholarly journals On supersymmetric AdS4 orientifold vacua

2020 ◽  
Vol 2020 (8) ◽  
Author(s):  
Fernando Marchesano ◽  
Eran Palti ◽  
Joan Quirant ◽  
Alessandro Tomasiello
Keyword(s):  
String Theory ◽  
Cosmological Constant ◽  
Bianchi Identities ◽  
Expansion Parameter ◽  
First Order ◽  
Ricci Flat ◽  
Key Features ◽  
One To One ◽  
Calabi Yau Manifolds

Abstract In this work we study ten-dimensional solutions to type IIA string theory of the form AdS4 × X6 which contain orientifold planes and preserve $$ \mathcal{N} $$ N = 1 supersymmetry. In particular, we consider solutions which exhibit some key features of the four-dimensional DGKT proposal for compactifications on Calabi-Yau manifolds with fluxes, and in this sense may be considered their ten-dimensional uplifts. We focus on the supersymmetry equations and Bianchi identities, and find solutions to these that are valid at the two-derivative level and at first order in an expansion parameter which is related to the AdS cosmological constant. This family of solutions is such that the background metric is deformed from the Ricci-flat one to one exhibiting SU(3) × SU(3)-structure, and dilaton gradients and warp factors are induced.

scholarly journals GRAVITY ON NONCOMMUTATIVE D-BRANES

2003 ◽  
Vol 18 (07) ◽  
pp. 1051-1066 ◽  
Author(s):  
F. ARDALAN ◽  
H. ARFAEI ◽  
M. R. GAROUSI ◽  
A. GHODSI
Keyword(s):  
String Theory ◽  
Effective Action ◽  
Low Energy ◽  
Bosonic String ◽  
First Order ◽  
Energy Scattering ◽  
Bosonic String Theory ◽  
Brane Action

The effective action for the low energy scattering of two gravitons with a D-brane in the presence of a constant antisymmetric B field in bosonic string theory is calculated and the modification to the standard D-brane action to first order in α′ is obtained.

scholarly journals First order string theory and the Kodaira-Spencer equations. I

2009 ◽  
Vol 2009 (09) ◽  
pp. 028-028 ◽  
Author(s):  
O Gamayun ◽  
A.S Losev ◽  
A Marshakov
Keyword(s):  
String Theory ◽  
First Order

scholarly journals PERTURBATION OF THE GROUND VARIETIES OF c=1 STRING THEORY

1993 ◽  
Vol 08 (33) ◽  
pp. 3187-3199 ◽  
Author(s):  
DEBASHIS GHOSHAL ◽  
PORUS LAKDAWALA ◽  
SUNIL MUKHI
Keyword(s):  
String Theory ◽  
Moduli Space ◽  
The Self ◽  
The Other ◽  
Cosmological Perturbation ◽  
First Order ◽  
Singular Varieties ◽  
Universal Deformations ◽  
Other Hand

We discuss the effect of perturbations on the ground rings of c=1 string theory at the various compactification radii defining the AN points of the moduli space. We argue that perturbations by plus-type moduli define ground varieties which are equivalent to the unperturbed ones under redefinitions of the coordinates and hence cannot smoothen the singularity. Perturbations by the minus-type moduli, on the other hand, lead to semi-universal deformations of the singular varieties that can smoothen the singularity under certain conditions. To first order, the cosmological perturbation by itself can remove the singularity only at the self-dual (A1) point.

scholarly journals Fate of the Born–Infeld Solution in String Theory

2003 ◽  
Vol 18 (24) ◽  
pp. 1681-1689 ◽  
Author(s):  
G. Karatheodoris ◽  
A. Pinzul ◽  
A. Stern
Keyword(s):  
String Theory ◽  
First Order

We argue that the Born–Infeld solution on the D9-brane is unstable under inclusion of derivative corrections to Born–Infeld theory coming from string theory. More specifically, we find no electrostatic solutions to the first-order corrected Born–Infeld theory on the D9-brane which give a finite value for the Lagrangian.

scholarly journals First order string theory and the Kodaira-Spencer equations. II

2009 ◽  
Vol 2009 (09) ◽  
pp. 065-065
Author(s):  
O Gamayun ◽  
A Marshakov
Keyword(s):  
String Theory ◽  
First Order

scholarly journals COSMOLOGICAL SOLUTIONS WITH DILATON AND MAXIMALLY SYMMETRIC SPACE IN STRING THEORY

1992 ◽  
Vol 01 (01) ◽  
pp. 223-245 ◽  
Author(s):  
A.A. TSEYTLIN
Keyword(s):  
String Theory ◽  
Symmetric Space ◽  
Central Charge ◽  
Time Dependent ◽  
Leading Order ◽  
Spatial Curvature ◽  
Regular Solutions ◽  
First Order ◽  
Cosmological Solutions ◽  
Open Question

Time-dependent solutions of the leading-order string effective equations for a nonzero central charge deficit and curved maximally-symmetric space are studied. Some regular solutions are found for the case of nontrivial antisymmetric tensor and vector backgrounds (in various dimensions) and negative spatial curvature. It remains an open question which conformal theories are exact generalizations of these solutions. An analogy between the string cosmological solutions and the solutions of the standard first order renormalisation group equations interpolating between “static” conformal theories is discussed.

scholarly journals O(D, D) and the string α′ expansion: an obstruction

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Stanislav Hronek ◽  
Linus Wulff
Keyword(s):  
Field Theory ◽  
String Theory ◽  
First Order ◽  
Duality Symmetry ◽  
Independent Invariant ◽  
Double Field Theory ◽  
Set Up ◽  
String Theories

Abstract Double Field Theory (DFT) is an attempt to make the O(d, d) T-duality symmetry of string theory manifest, already before reducing on a d-torus. It is known that supergravity can be formulated in an O(D, D) covariant way, and remarkably this remains true to the first order in α′. We set up a systematic way to analyze O(D, D) invariants, working order by order in fields, which we carry out up to order α′3. At order α′ we recover the known Riemann squared invariant, while at order α′2 we find no independent invariant. This is compatible with the α′ expansion in string theory. However, at order α′3 we show that there is again no O(D, D) invariant, in contradiction to the fact that all string theories have quartic Riemann terms with coefficient proportional to ζ (3). We conclude that DFT and similar frameworks cannot capture the full α′ expansion in string theory.

Dual systems for all: Higher-order, role-based relational reasoning as a uniquely derived feature of human cognition

2019 ◽  
Vol 42 ◽  
Author(s):  
Daniel J. Povinelli ◽  
Gabrielle C. Glorioso ◽  
Shannon L. Kuznar ◽  
Mateja Pavlic
Keyword(s):  
Temporal Reasoning ◽  
Higher Order ◽  
Important Case ◽  
Human Cognition ◽  
Relational Reasoning ◽  
Dual Systems ◽  
First Order ◽  
Reasoning System ◽  
Role Based

Abstract Hoerl and McCormack demonstrate that although animals possess a sophisticated temporal updating system, there is no evidence that they also possess a temporal reasoning system. This important case study is directly related to the broader claim that although animals are manifestly capable of first-order (perceptually-based) relational reasoning, they lack the capacity for higher-order, role-based relational reasoning. We argue this distinction applies to all domains of cognition.

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