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On the degrees of freedom of R$^{2}$ gravity in flat spacetime
/ Hell, Anamaria (Tokyo U., IPMU) ; Lust, Dieter (Munich U. ; Munich, Max Planck Inst.) ; Zoupanos, George (Munich, Max Planck Inst. ; Natl. Tech. U., Athens ; CERN ; Heidelberg U.)
We study the degrees of freedom of $R^2$ gravity in flat spacetime with two approaches. By rewriting the theory a la Stueckelberg, and implementing Lorentz-like gauges to the metric perturbations, we confirm that the pure theory propagates one scalar degree of freedom, while the full theory contains two tensor modes in addition. [...]
arXiv:2311.08216; LMU-ASC 34/23; MPP-2023-256.-
2024-02-07 - 36 p.
- Published in : JHEP 2402 (2024) 039
Fulltext: 2311.08216 - PDF; Publication - PDF;
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Bimetric, Conformal Supergravity and its Superstring Embedding
/ Ferrara, Sergio (CERN ; Frascati ; UCLA) ; Kehagias, Alex (Natl. Tech. U., Athens) ; Lüst, Dieter (CERN ; Munich U., ASC ; Munich, Max Planck Inst.)
We discuss the connection between Weyl$^2$ supergravity and superstrings and further discuss holography between 4-dimensional, ${\cal N}=4$ superconformal Weyl$^2$ supergravity and ${\cal N}=8$, higher spin-four theory on $AdS_5$. The Weyl$^2$ plus Einstein supergravity theory is a special kind of a bimetric gravity theory and consists of a massless graviton multiplet plus an additional massive spin-two supermultiplet. [...]
arXiv:1810.08147; CERN-TH-2018-222; MPP-2018-249; LMU-ASC 64/18; LMU-ASC-64-18.-
2019-05-20 - 33 p.
- Published in : JHEP 05 (2019) 100
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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Aspects of Weyl Supergravity
/ Ferrara, Sergio (CERN ; Frascati ; UCLA) ; Kehagias, Alex (Natl. Tech. U., Athens) ; Lüst, Dieter (CERN ; Munich U., ASC ; Munich, Max Planck Inst.)
In this paper we study the spectrum of all conformal, ${\cal N}$-extended supergravities (${\cal N}=1,2,3,4$) in four space-time dimensions. When these theories are obtained as massless limit of Einstein plus Weyl$^2$supergravity, the appropriate counting of the enhanced gauge symmetries allow us to derive the massless spectrum which consist of a dipole ghost graviton multiplet, a ${\cal N}$-fold tripole ghost gravitino, the third state belonging to a spin 3/2 multiplet and a residual vector multiplet present for non-maximal ${\cal N}<4$ theories. [...]
arXiv:1806.10016; CERN-TH-2018-144; MPP-2018-142; LMU-ASC 39/18; LMU-ASC-39-18.-
2018-08-31 - 22 p.
- Published in : JHEP 08 (2018) 197
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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Spin-four N=7 W-Supergravity: S-fold and Double Copy Construction
/ Ferrara, Sergio (CERN ; Frascati ; UCLA) ; Lüst, Dieter (CERN ; Munich U., ASC ; Munich, Max Planck Inst.)
In the present investigation we consider the possibility of having new massive, higher spin W-supergravity theories, which do not exist as four-dimensional perturbative models. These theories are based on a double copy construction of two supersymmetric field theories, where at least one factor is given by a N=3 field theory, which is a non-perturbative S-fold of N=4 super Yang-Mills theory. [...]
arXiv:1805.10022; LMU-ASC-29-18; CERN-TH-2018-112; MPP-2018-87; LMU-ASC 29/18.-
2018-07-18 - 33 p.
- Published in : JHEP 07 (2018) 114
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: arXiv:1805.10022 - PDF; 1805.10022 - PDF;
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Stringy origin of diboson and dijet excesses at the LHC
/ Anchordoqui, Luis A. (Lehman Coll. ; CUNY, Graduate School - U. Ctr. ; Amer. Museum Natural Hist.) ; Antoniadis, Ignatios (Paris, LPTHE ; CERN ; U. Bern, AEC) ; Goldberg, Haim (Northeastern U.) ; Huang, Xing (Taiwan, Natl. Normal U.) ; Lust, Dieter (Munich U., ASC ; Munich, Max Planck Inst.) ; Taylor, Tomasz R. (Northeastern U.)
Very recently, the ATLAS and CMS collaborations reported diboson and dijet excesses above standard model expectations in the invariant mass region of 1.8 -2.0 TeV. Interpreting the diboson excess of events in a model independent fashion suggests that the vector boson pair production searches are best described by WZ or ZZ topologies, because states decaying into W^+W^- pairs are strongly constrained by semileptonic searches. [...]
MPP--2015--155; LMU-ASC-45-15; arXiv:1507.05299; MPP-2015-155; LMU-ASC 45-15.-
2015-08-15 - 5 p.
- Published in : Phys. Lett. B 749 (2015) 484-488
Article from SCOAP3: PDF; Elsevier Open Access article: PDF; Preprint: PDF; External link: Preprint
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9.
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Aspects of Quadratic Gravity
/ Alvarez-Gaume, Luis (CERN) ; Kehagias, Alex (Natl. Tech. U., Athens ; Geneva U., CAP) ; Kounnas, Costas (Ecole Normale Superieure) ; Lust, Dieter (CERN ; Munich, Max Planck Inst. ; Munich U., ASC) ; Riotto, Antonio (Geneva U., CAP)
We discuss quadratic gravity where terms quadratic in the curvature tensor are included in the action. After reviewing the corresponding field equations, we analyze in detail the physical propagating modes in some specific backgrounds. [...]
arXiv:1505.07657; LMU-ASC 26-15; MPP-2015-95; CERN-PH-TH-2015-099.-
Geneva : CERN, 2016 - 24 p.
- Published in : Fortsch. Phys.: 64 (2016) , no. 2-3, pp. 176-189
Fulltext: PDF; External link: Preprint
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13th Hellenic School and Workshops on Elementary Particle Physics and Gravity : Workshop on Noncommutative Field Theory and Gravity - CORFU2013-NC
8 - 15 Sep 2013
- Corfu, Greece
/ Anagnostopoulos, Konstantinos (ed.); Lechtenfeld, Olaf (ed.); Lüst, Dieter (ed.); Kawai, Hikaru (ed.); Nishimura, Jun (ed.); Steinacker, Harold (ed.); Szabo, Richard (ed.); Watamura, Satoshi (ed.); Zoupanos, George (ed.)
2014
- Published in : Fortschr. Phys. 62 (2014)
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