Logo der Universität Hamburg

A1 – Particle Physics from String Compactifications

Project Leaders

Wilfried Buchmüller (e-mail | group homepage)

Jan Louis (e-mail | group homepage)


The project centers around questions at the interface of particle physics and string theory. More specifically the goal is to study models of particle physics which enlarge the Standard Model (SM) and which lead to testable predictions at the LHC. During Phase I the emphasis has been on heterotic string compactifications which contain grand unified field theories (GUTs) in six dimensions as intermediate step. The main topics of Phase II have been the connection of GUT-like orbifold models with smooth Calabi-Yau compactifications, the issue of moduli stabilization in orbifold, intersecting brane and F-theory models and specific predictions of these models concerning light higgsinos. In Phase III we continue our studies of string inspired supersymmetric phenomenology but in view of the recent results from the LHC broaden the scope of the project by addressing the question of embedding composite Higgs models in string theory.


Paul Oehlmann

Kai Schmidt-Hoberg

Alexander Westphal

Former members

Dmitry Belyaev

Iman Benmachiche

Felix Brümmer

Kwang Sik Jeong

Oleg Lebedev

Danny Martinez-Pedrera

Jan Moeller

Susha Parameswaran

Saul Ramos-Sanchez

Robert Richter

Fabian Rühle

Martin Schasny

Jonas Schmidt

Roberto Valandro

Andreas Weiler

Lucila Zárate


Get these publications as bibtex-file

"A low Fermi scale from a simple gaugino-scalar mass relation"
Brümmer, Felix and Buchmüller, Wilfried
JHEP 03, 075 (2014)
doi: 10.1007/JHEP03(2014)075
eprint: 1311.1114 [hep-ph]

"Long-lived higgsinos as probes of gravitino dark matter at the LHC"
Bobrovskyi, S. and Hajer, J. and Rydbeck, S.
JHEP 1302, 133 (2013)
doi: 10.1007/JHEP02(2013)133
eprint: 1211.5584 [hep-ph]

"String Constraints on Discrete Symmetries in MSSM Type II Quivers"
Anastasopoulos, Pascal and Cvetic, Mirjam and Richter, Robert and Vaudrevange, Patrick K.S.
JHEP 1303, 011 (2013)
doi: 10.1007/JHEP03(2013)011
eprint: 1211.1017 [hep-th]

"Discrete symmetries in semi-realistic orientifold compactifications"
Anastasopoulos, P. and Cvetic, M. and Richter, R. and Vaudrevange, P. K. S.
Proceedings, 12th Hellenic School and Workshops on Elementary Particle Physics and Gravity CORFU2012-ST, CORFU2012-PU and CORFU2012-SM: Corfu, Greece, September 8-27, 2012, PoS (2013)
[ link ]

"Voisin-Borcea Manifolds and Heterotic Orbifold Models"
Buchmüller, W. and Louis, J. and Schmidt, J. and Valandro, R.
JHEP 1210, 114 (2012)
doi: 10.1007/JHEP10(2012)114
eprint: 1208.0704 [hep-th]

"D-Branes at del Pezzo Singularities: Global Embedding and Moduli Stabilisation"
Cicoli, Michele and Krippendorf, Sven and Mayrhofer, Christoph and Quevedo, Fernando and Valandro, Roberto
JHEP 1209, 019 (2012)
doi: 10.1007/JHEP09(2012)019
eprint: 1206.5237 [hep-th]

"Algebraic description of G-flux in F-theory: new techniques for F-theory phenomenology"
Braun, Andreas P. and Collinucci, Andres and Valandro, Roberto
Fortsch.Phys. 60, 934-940 (2012)
doi: 10.1002/prop.201200018
eprint: 1202.5029 [hep-th]

"The Fermi scale as a focus point of high-scale gauge mediation"
Brümmer, F. and Buchmüller, W.
JHEP 1205, 006 (2012)
doi: 10.1007/JHEP05(2012)006
eprint: 1201.4338 [hep-ph]

"6D Effective Action of Heterotic Compactification on K3 with Nontrivial Gauge Bundles"
Louis, Jan and Schasny, Martin and Valandro, Roberto
JHEP 1204, 028 (2012)
doi: 10.1007/JHEP04(2012)028
eprint: 1112.5106 [hep-th]

"Searching for light higgsinos with b-jets and missing leptons"
Bobrovskyi, S. and Brümmer, F. and Buchmüller, W. and Hajer, J.
JHEP 1201, 122 (2012)
doi: 10.1007/JHEP01(2012)122
eprint: 1111.6005 [hep-ph]

"Moduli Stabilisation for Chiral Global Models"
Cicoli, Michele and Mayrhofer, Christoph and Valandro, Roberto
JHEP 1202, 062 (2012)
doi: 10.1007/JHEP02(2012)062
eprint: 1110.3333 [hep-th]

"G-flux in F-theory and algebraic cycles"
Braun, Andreas P. and Collinucci, Andres and Valandro, Roberto
Nucl.Phys. B856, 129-179 (2012)
doi: 10.1016/j.nuclphysb.2011.10.034
eprint: 1107.5337 [hep-th]

"Revisiting Coupling Selection Rules in Heterotic Orbifold Models"
Kobayashi, Tatsuo and Parameswaran, Susha L. and Ramos-Sanchez, Saul and Zavala, Ivonne
JHEP 1205, 008 (2012)
doi: 10.1007/JHEP12(2012)049, 10.1007/JHEP05(2012)008
eprint: 1107.2137 [hep-th]

"Light Higgsinos as Heralds of Higher-Dimensional Unification"
Brümmer, F. and Buchmüller, W.
JHEP 1107, 010 (2011)
doi: 10.1007/JHEP07(2011)010
eprint: 1105.0802 [hep-ph]

"Moduli fixing in semirealistic string compactifications"
Ramos-Sanchez, Saul
J.Phys.Conf.Ser. 287, 012021 (2011)
doi: 10.1088/1742-6596/287/1/012021
eprint: 1101.3803 [hep-th]

"On Moduli Stabilisation and de Sitter Vacua in MSSM Heterotic Orbifolds"
Parameswaran, Susha L. and Ramos-Sanchez, Saul and Zavala, Ivonne
JHEP 1101, 071 (2011)
doi: 10.1007/JHEP01(2011)071
eprint: 1009.3931 [hep-th]

"Coupling Brane Fields to Bulk Supergravity"
Parameswaran, Susha L. and Schmidt, Jonas
Phys.Lett. B696, 131-137 (2011)
doi: 10.1016/j.physletb.2010.11.069
eprint: 1008.3832 [hep-th]

"Dynamical Matter-Parity Breaking and Gravitino Dark Matter"
Schmidt, Jonas and Weniger, Christoph and Yanagida, Tsutomu T.
Phys.Rev. D82, 103517 (2010)
doi: 10.1103/PhysRevD.82.103517
eprint: 1008.0398 [hep-ph]

"Proton Hexality in Local Grand Unification"
Forste, Stefan and Nilles, Hans Peter and Ramos-Sanchez, Saul and Vaudrevange, Patrick K.S.
Phys.Lett. B693, 386-392 (2010)
doi: 10.1016/j.physletb.2010.08.057
eprint: 1007.3915 [hep-ph]

"The mu-problem, the NMSSM and string theory"
Ramos-Sanchez, Saul
Fortsch.Phys. 58, 748-752 (2010)
doi: 10.1002/prop.201000058
eprint: 1003.1307 [hep-ph]

"The NMSSM and String Theory"
Lebedev, Oleg and Ramos-Sanchez, Saul
Phys.Lett. B684, 48-51 (2010)
doi: 10.1016/j.physletb.2009.12.058
eprint: 0912.0477 [hep-ph]

"Light Moduli in Almost No-Scale Models"
Buchmüller, Wilfried and Moller, Jan and Schmidt, Jonas
Nucl.Phys. B826, 365-378 (2010)
doi: 10.1016/j.nuclphysb.2009.10.024
eprint: 0909.0482 [hep-ph]

"Heterotic compactifications on SU2-structure backgrounds"
Louis, Jan and Martinez-Pedrera, Danny and Micu, Andrei
JHEP 09, 012 (2009)
doi: 10.1088/1126-6708/2009/09/012
eprint: 0907.3799 [hep-th]

"Enhanced Symmetries of Orbifolds from Moduli Stabilization"
Buchmüller, Wilfried and Catena, Riccardo and Schmidt-Hoberg, Kai
Nucl.Phys. B821, 1-20 (2009)
doi: 10.1016/j.nuclphysb.2009.06.007
eprint: 0902.4512 [hep-th]

"General Perturbations for Braneworld Compactifications and the Six Dimensional Case"
Parameswaran, S. L. and Randjbar-Daemi, S. and Salvio, A.
JHEP 03, 136 (2009)
doi: 10.1088/1126-6708/2009/03/136
eprint: 0902.0375 [hep-th]

"The Fate of Unstable Gauge Flux Compactifications"
Burgess, C. P. and Parameswaran, S. L. and Zavala, I.
JHEP 05, 008 (2009)
doi: 10.1088/1126-6708/2009/05/008
eprint: 0812.3902 [hep-th]

"Higgs versus Matter in the Heterotic Landscape"
Buchmüller, Wilfried and Schmidt, Jonas
Nucl.Phys. B807, 265-289 (2009)
doi: 10.1016/j.nuclphysb.2008.09.011
eprint: 0807.1046 [hep-th]

"Simple d=4 supergravity with a boundary"
Belyaev, Dmitry V. and van Nieuwenhuizen, Peter
JHEP 09, 069 (2008)
doi: 10.1088/1126-6708/2008/09/069
eprint: 0806.4723 [hep-th]

"Small Extra Dimensions from the Interplay of Gauge and Supersymmetry Breaking"
Buchmüller, Wilfried and Catena, Riccardo and Schmidt-Hoberg, Kai
Nucl.Phys. B804, 70-89 (2008)
doi: 10.1016/j.nuclphysb.2008.06.012
eprint: 0803.4501 [hep-ph]

"The Effective action of the heterotic string compactified on manifolds with SU3 structure"
Benmachiche, Iman and Louis, Jan and Martinez-Pedrera, Danny
Class.Quant.Grav. 25, 135006 (2008)
doi: 10.1088/0264-9381/25/13/135006
eprint: 0802.0410 [hep-th]

"Rigid supersymmetry with boundaries"
Belyaev, Dmitry V. and van Nieuwenhuizen, Peter
JHEP 04, 008 (2008)
doi: 10.1088/1126-6708/2008/04/008
eprint: 0801.2377 [hep-th]

"Tensor calculus for supergravity on a manifold with boundary"
Belyaev, Dmitry V. and van Nieuwenhuizen, Peter
JHEP 02, 047 (2008)
doi: 10.1088/1126-6708/2008/02/047
eprint: 0711.2272 [hep-th]

"Axion-dilaton cosmology and dark energy"
Catena, Riccardo and Moller, Jan
JCAP 0803, 012 (2008)
doi: 10.1088/1475-7516/2008/03/012
eprint: 0709.1931 [hep-ph]

"Seesaw neutrinos from the heterotic string"
Buchmüller, Wilfried and Hamaguchi, Koichi and Lebedev, Oleg and Ramos-Sanchez, Saul and Ratz, Michael
Phys.Rev.Lett. 99, 021601 (2007)
doi: 10.1103/PhysRevLett.99.021601
eprint: hep-ph/0703078 [HEP-PH]

"Bulk-brane supergravity"
Belyaev, Dmitry V.
SUSY 2007 Proceedings, 15th International Conference on Supersymmetry and Unification of Fundamental Interactions, July 26 - August 1, 2007, Karlsruhe, Germany (2007)
eprint: 0710.4540 [hep-th] [ link ]

"Gauge-Higgs Unification from the Heterotic String"
Schmidt, Jonas
AIP Conf.Proc. 957, 349-352 (2007)
doi: 10.1063/1.2823799
eprint: 0708.4305 [hep-th]

"Local SU5 Unification from the Heterotic String"
Buchmüller, W. and Ludeling, C. and Schmidt, Jonas
JHEP 0709, 113 (2007)
doi: 10.1088/1126-6708/2007/09/113
eprint: 0707.1651 [hep-ph]


PhD thesis: "String inspired soft terms and the Higgs mass in the NMSSM"
Lucila Zarate
Universität Hamburg (2016)
[ link ]

PhD thesis: "Effective action of heterotic compactification on K3 with non-trivial gauge bundles"
Schasny, Martin
Universität Hamburg (2012)
[ link ]

PhD thesis: "Local Grand Unification in the Heterotic Landscape"
Schmidt, Jonas
Fortsch.Phys. 58, 3-111 (2010)
Universität Hamburg (2009)
doi: 10.1002/prop.200900079
eprint: 0906.5501 [hep-th]

PhD thesis: "GUT scale extra dimensions and light moduli in supergravity and cosmology"
Möller, Jan
Universität Hamburg (2010)
doi: 10.3204/DESY-THESIS-2010-017

Master thesis: "The Fayet-Iliopoulos D-term in field and string theory"
Kappl, Rolf
Universität Ulm (2008)
[ link ]

Master thesis: "Dark energy in scalar-tensor theories"
Möller, Jan
Universität Hamburg (2007)

Impressum  | last modified 03 Feb 2017