scholarly journals Spin structures on almost-flat manifolds

2016 ◽  
Vol 16 (2) ◽  
pp. 783-796 ◽  
Author(s):  
Anna Gąsior ◽  
Nansen Petrosyan ◽  
Andrzej Szczepański
Keyword(s):  
Spin Structures ◽  
Flat Manifolds

Second Stiefel-Whitney class and spin structures on flat manifolds of diagonal type

2011 ◽  
Author(s):  
Sergio Console ◽  
Juan Pablo Rossetti ◽  
Roberto J. Miatello ◽  
Carlos Herdeiro ◽  
Roger Picken
Keyword(s):  
Spin Structures ◽  
Whitney Class ◽  
Flat Manifolds

Spin Structures on Flat Manifolds

2006 ◽  
Vol 148 (4) ◽  
pp. 283-296 ◽  
Author(s):  
K. Dekimpe ◽  
M. Sadowski ◽  
A. Szczepański
Keyword(s):  
Spin Structures ◽  
Flat Manifolds

scholarly journals Spin structures on flat manifolds

2015 ◽  
Vol 436 ◽  
pp. 277-291 ◽  
Author(s):  
Rafał Lutowski ◽  
Bartosz Putrycz
Keyword(s):  
Spin Structures ◽  
Flat Manifolds

scholarly journals Spin structures of flat manifolds of diagonal type

2019 ◽  
Vol 21 (2) ◽  
pp. 333-344
Author(s):  
Rafał Lutowski ◽  
Nansen Petrosyan ◽  
Jerzy Popko ◽  
Andrzej Szczepański
Keyword(s):  
Spin Structures ◽  
Flat Manifolds

scholarly journals Stringy tachyonic instabilities of non-supersymmetric Ricci flat backgrounds

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Bobby Samir Acharya ◽  
Gerardo Aldazabal ◽  
Eduardo Andrés ◽  
Anamaría Font ◽  
Kumar Narain ◽  
...  
Keyword(s):  
Small Radius ◽  
Vacuum Energy Density ◽  
Large Radius ◽  
Spin Structures ◽  
Special Holonomy ◽  
Conformal Field ◽  
Ricci Flat ◽  
Flat Manifolds ◽  
Superstring Theories ◽  
M Theory

Abstract Superstring/M-theory compactified on compact Ricci flat manifolds have recently been conjectured to exhibit instabilities whenever the metrics do not have special holonomy. We use worldsheet conformal field theory to investigate instabilities of Type II superstring theories on compact, Ricci flat, spin 3-manifolds including a worldsheet description of their spin structures. The instabilities are signalled by the appearance of stringy tachyons at small radius and a negative (1-loop) vacuum energy density at large radius. We briefly discuss the extension to higher dimensions.

scholarly journals Corrigendum to: Spin Structures on Flat Manifolds with Cyclic Holonomy

2011 ◽  
Vol 39 (7) ◽  
pp. 2659-2659
Author(s):  
Gerhard Hiss ◽  
Andrzej Szczepański
Keyword(s):  
Spin Structures ◽  
Flat Manifolds

scholarly journals CLASSIFICATION OF SPIN STRUCTURES ON FOUR‐DIMENSIONAL ALMOST‐FLAT MANIFOLDS

Mathematika ◽  
2018 ◽  
Vol 64 (1) ◽  
pp. 253-266
Author(s):  
R. Lutowski ◽  
N. Petrosyan ◽  
A. Szczepański
Keyword(s):  
Spin Structures ◽  
Flat Manifolds

Spin Structures on Flat Manifolds with Cyclic Holonomy

2008 ◽  
Vol 36 (1) ◽  
pp. 11-22 ◽  
Author(s):  
Gerhard Hiss ◽  
Andrzej Szczepański
Keyword(s):  
Spin Structures ◽  
Flat Manifolds

scholarly journals Crystallographic groups and flat manifolds from surface braid groups

2020 ◽  
pp. 107560
Author(s):  
Daciberg Lima Gonçalves ◽  
John Guaschi ◽  
Oscar Ocampo ◽  
Carolina de Miranda e Pereiro
Keyword(s):  
Braid Groups ◽  
Crystallographic Groups ◽  
Flat Manifolds
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