Zobrazeno 1 - 10
of 30
pro vyhledávání: '"Ümit Ertem"'
Autor:
Ümit Ertem
Publikováno v:
Nuclear Physics B, Vol 1007, Iss , Pp 116665- (2024)
Modifications of Dirac operators in supergravity flux backgrounds are considered. Modified spin curvature operators and squares of modified Dirac operators corresponding to Schrödinger-Lichnerowicz-like formulas are obtained for different types of f
Externí odkaz:
https://doaj.org/article/300a07f89c224af2b33e452dad1c97be
Autor:
Ümit Ertem
Publikováno v:
Differential Geometry and its Applications. 54:236-244
The basic first-order differential operators of spin geometry that are Dirac operator and twistor operator are considered. Special types of spinors defined from these operators such as twistor spinors and Killing spinors are discussed. Symmetry opera
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ca41354c01e3a7947469deb5bf8a4504
https://doi.org/10.1016/j.difgeo.2017.04.002
https://doi.org/10.1016/j.difgeo.2017.04.002
The motion of membranes interacting with external fields in space-times with curvature and torsion is considered. The intrinsic and extrinsic properties of the immersion are fused together to form a stress tensor for the corresponding material hypers
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f9081e14bdf00bdbe095f997ac7aaf28
http://arxiv.org/abs/1903.07374
http://arxiv.org/abs/1903.07374
Publikováno v:
Nuclear Physics
M-theory backgrounds in the form of unwarped compactifications with or without fluxes are considered. We construct the bilinear forms of supergravity Killing spinors for different choices of spinor inner products on these backgrounds. The equations s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3cc7ef593ef809a24929a5c6b8e4b186
https://doi.org/10.1016/j.nuclphysb.2020.115248
https://doi.org/10.1016/j.nuclphysb.2020.115248
Autor:
Ümit Ertem, Özgür Açık
We generalize the symmetry superalgebras of isometries and geometric Killing spinors on a manifold to include all the hidden symmetries of the manifold generated by Killing spinors in all dimensions. We show that bilinears of geometric Killing spinor
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e6d8fa9d4eaebb284cc815fea93232ae
http://arxiv.org/abs/1806.01079
http://arxiv.org/abs/1806.01079
Autor:
Özgür Açık, Ümit Ertem
Publikováno v:
Physical Review
Spin raising and lowering operators for massless field equations constructed from twistor spinors are considered. Solutions of the spin-$\frac{3}{2}$ massless Rarita-Schwinger equation from source-free Maxwell fields and twistor spinors are construct
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::98fdeb54ba89204f5c5d94df64382ba0
https://aperta.ulakbim.gov.tr/record/34307
https://aperta.ulakbim.gov.tr/record/34307
Autor:
Ümit Ertem
Real and complex Clifford bundles and Dirac operators defined on them are considered. By using the index theorems of Dirac operators, table of topological invariants is constructed from the Clifford chessboard. Through the relations between K-theory
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4ba1e1cc8a09bf71e85a1784ed10e703
http://arxiv.org/abs/1709.01778
http://arxiv.org/abs/1709.01778
Autor:
Ümit Ertem
We show that the first-order symmetry operators of twistor spinors can be constructed from conformal Killing-Yano forms in conformally-flat backgrounds. We express the conditions on conformal Killing-Yano forms to obtain mutually commuting symmetry o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f74056e01e62b9c1b2c7d1dcc11d1f68
http://arxiv.org/abs/1605.03361
http://arxiv.org/abs/1605.03361
Autor:
Ümit Ertem
Publikováno v:
Volume: 40, Issue: 2 113-126
Turkish Journal of Physics
Turkish Journal of Physics
We consider the bosonic sectors of supergravity theories in ten and eleven dimensions which correspond to the low energy limits of string theories and M-theory. The solutions of supergravity field equations are known as supergravity backgrounds and t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::60e8761436065a1e2d0ab5e1b4101c49
https://dergipark.org.tr/tr/pub/tbtkphysics/issue/35847/401842
https://dergipark.org.tr/tr/pub/tbtkphysics/issue/35847/401842
Autor:
Ümit Ertem
We construct the first-order symmetry operators of Killing spinor equation in terms of odd Killing-Yano forms. By modifying the Schouten-Nijenhuis bracket of Killing-Yano forms, we show that the symmetry operators of Killing spinors close into an alg
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3d7d336fdba9504a270a3d2c88ad2c08
http://arxiv.org/abs/1602.03750
http://arxiv.org/abs/1602.03750