I am a physicist, working mainly on early universe cosmology. In my research, I explore mathematical models for the very early universe, in particular models that try to explain the big bang.
Below is a list of my scientific papers. The e-Print links lead to freely available versions.
Delicate curvature bounces in the no-boundary wave function and in the late universe
Jean-Luc Lehners (Potsdam, Max Planck Inst.), Jerome Quintin (U. Waterloo (main) and Perimeter Inst. Theor. Phys.)
e-Print: 2403.15205 [gr-qc]
NUTs, Bolts and Stokes Phenomena in the No-Boundary Wave Function
Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 2402.10501 [gr-qc]
Higher-order gravity, finite action, and a safe beginning for the universe
Jean-Luc Lehners (Potsdam, Max Planck Inst.), K.S. Stelle (Imperial Coll., London)
e-Print: 2312.14048 [hep-th]
DOI: 10.1140/epjp/s13360-024-05125-y
Published in: Eur.Phys.J.Plus 139 (2024), 380
Stability of axion-dilaton wormholes
Caroline Jonas (Leuven U.), George Lavrelashvili (Javakhishvili State U.), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 2312.08971 [hep-th]
DOI: 10.1103/PhysRevD.109.086022 (publication)
Published in: Phys.Rev.D 109 (2024) 8, 086022
A small Universe
Jean-Luc Lehners (Potsdam, Max Planck Inst.), Jerome Quintin (U. Waterloo (main) and Perimeter Inst. Theor. Phys.)
e-Print: 2309.03272 [hep-th]
DOI: 10.1016/j.physletb.2024.138488 (publication)
Published in: Phys.Lett.B 850 (2024), 138488
Zoo of axionic wormholes
Caroline Jonas (Potsdam, Max Planck Inst.), George Lavrelashvili (Razmadze Math. Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 2306.11129 [hep-th]
DOI: 10.1103/PhysRevD.108.066012 (publication)
Published in: Phys.Rev.D 108 (2023) 6, 066012
Review of the no-boundary wave function
Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 2303.08802 [hep-th]
DOI: 10.1016/j.physrep.2023.06.002 (publication)
Published in: Phys.Rept. 1022 (2023), 1-82
Allowable complex scalars from Kaluza-Klein compactifications and metric rescalings
Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 2209.14669 [hep-th]
DOI: 10.1103/PhysRevD.107.046004 (publication)
Published in: Phys.Rev.D 107 (2023) 4, 046004
How to create universes with internal flux
Jean-Luc Lehners (Potsdam, Max Planck Inst.), Rahim Leung (Imperial Coll., London), K.S. Stelle (Imperial Coll., London)
e-Print: 2209.08960 [hep-th]
DOI: 10.1103/PhysRevD.107.046006 (publication)
Published in: Phys.Rev.D 107 (2023) 4, 046006
Uses of complex metrics in cosmology
Caroline Jonas (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Jerome Quintin (Potsdam, Max Planck Inst. and Fields Inst., Toronto and U. Waterloo (main))
e-Print: 2205.15332 [hep-th]
DOI: 10.1007/JHEP08(2022)284
Published in: JHEP 08 (2022), 284
Revisiting the no-boundary proposal with a scalar field
Caroline Jonas (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Vincent Meyer (Humboldt U., Berlin and Zurich, ETH)
e-Print: 2112.07986 [hep-th]
DOI: 10.1103/PhysRevD.105.043529 (publication)
Published in: Phys.Rev.D 105 (2022) 4, 043529
Allowable complex metrics in minisuperspace quantum cosmology
Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 2111.07816 [hep-th]
DOI: 10.1103/PhysRevD.105.026022 (publication)
Published in: Phys.Rev.D 105 (2022) 2, 026022
Scalar lumps with two horizons
George Lavrelashvili (Tbilisi State U.), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 2109.04180 [gr-qc]
DOI: 10.1103/PhysRevD.105.024051 (publication)
Published in: Phys.Rev.D 105 (2022) 2, 024051
Wave function of simple universes analytically continued from negative to positive potentials
Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 2105.12075 [hep-th]
DOI: 10.1103/PhysRevD.104.063527 (publication)
Published in: Phys.Rev.D 104 (2021) 6, 063527
Scalar lumps with a horizon
George Lavrelashvili (Tbilisi State U. and Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Marc Schneider (Potsdam, Max Planck Inst.)
e-Print: 2104.13403 [hep-th]
DOI: 10.1103/PhysRevD.104.044007 (publication)
Published in: Phys.Rev.D 104 (2021) 4, 044007
Cosmological consequences of a principle of finite amplitudes
Caroline Jonas (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Jerome Quintin (Potsdam, Max Planck Inst.)
e-Print: 2102.05550 [hep-th]
DOI: 10.1103/PhysRevD.103.103525 (publication)
Published in: Phys.Rev.D 103 (2021) 10, 103525
Quantum Circuit Complexity of Primordial Perturbations
Jean-Luc Lehners (Potsdam, Max Planck Inst.), Jerome Quintin (Potsdam, Max Planck Inst.)
e-Print: 2012.04911 [hep-th]
DOI: 10.1103/PhysRevD.103.063527 (publication)
Published in: Phys.Rev.D 103 (2021) 6, 063527
No-boundary solutions are robust to quantum gravity corrections
Caroline Jonas (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 2008.04134 [hep-th]
DOI: 10.1103/PhysRevD.102.123539
Published in: Phys.Rev.D 102 (2020), 123539
Lessons for quantum cosmology from anti–de Sitter black holes
Alice Di Tucci (Potsdam, Max Planck Inst.), Michal P. Heller (NCBJ, Warsaw), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 2007.04872 [hep-th]
DOI: 10.1103/PhysRevD.102.086011
Published in: Phys.Rev.D 102 (2020) 8, 086011
No-boundary prescriptions in Lorentzian quantum cosmology
Alice Di Tucci (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Laura Sberna (Perimeter Inst. Theor. Phys.)
e-Print: 1911.06701 [hep-th]
DOI: 10.1103/PhysRevD.100.123543 (publication)
Published in: Phys.Rev.D 100 (2019) 12, 123543
A Safe Beginning for the Universe?
Jean-Luc Lehners (Potsdam, Max Planck Inst.), K.S. Stelle (Imperial Coll., London)
e-Print: 1909.01169 [hep-th]
DOI: 10.1103/PhysRevD.100.083540
Published in: Phys.Rev.D 100 (2019) 8, 083540
Homogeneous Transitions during Inflation: a Description in Quantum Cosmology
Sebastian F. Bramberger (Potsdam, Max Planck Inst.), Alice Di Tucci (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1907.05782 [gr-qc]
DOI: 10.1103/PhysRevD.101.063501
Published in: Phys.Rev.D 101 (2020) 6, 063501
Quantum Incompleteness of Inflation
Alice Di Tucci (Potsdam, Max Planck Inst.), Job Feldbrugge (Perimeter Inst. Theor. Phys.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Neil Turok (Perimeter Inst. Theor. Phys.)
e-Print: 1906.09007 [hep-th]
DOI: 10.1103/PhysRevD.100.063517
Published in: Phys.Rev.D 100 (2019) 6, 063517
Kerr-NUT-de Sitter as an Inhomogeneous Non-Singular Bouncing Cosmology
Andrés Anabalón (Adolfo Ibanez U.), Sebastian F. Bramberger (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1904.07285 [hep-th]
DOI: 10.1007/JHEP09(2019)096
Published in: JHEP 09 (2019), 096
No-Boundary Proposal as a Path Integral with Robin Boundary Conditions
Alice Di Tucci (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1903.06757 [hep-th]
DOI: 10.1103/PhysRevLett.122.201302
Published in: Phys.Rev.Lett. 122 (2019) 20, 201302
Nonsingular bounces catalyzed by dark energy
Sebastian F. Bramberger (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1901.10198 [hep-th]
DOI: 10.1103/PhysRevD.99.123523
Published in: Phys.Rev.D 99 (2019) 12, 123523
No smooth beginning for spacetime
Jean-Luc Lehners (Potsdam, Max Planck Inst.)
DOI: 10.1142/9789811258251_0005 , 10.1142/S0218271819300052
Published in:, Int.J.Mod.Phys.D 28 (2018) 02, 1930005
Small-Field and Scale-Free: Inflation and Ekpyrosis at their Extremes
Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1807.05240 [hep-th]
DOI: 10.1088/1475-7516/2018/11/001
Published in: JCAP 11 (2018), 001
Unstable no-boundary fluctuations from sums over regular metrics
Alice Di Tucci (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1806.07134 [gr-qc]
DOI: 10.1103/PhysRevD.98.103506
Published in: Phys.Rev.D 98 (2018) 10, 103506
Inconsistencies of the New No-Boundary Proposal
Job Feldbrugge (Perimeter Inst. Theor. Phys.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Neil Turok (Perimeter Inst. Theor. Phys.)
e-Print: 1805.01609 [hep-th]
DOI: 10.3390/universe4100100
Published in: Universe 4 (2018) 10, 100
Spinor driven cosmic bounces and their cosmological perturbations
Shane Farnsworth (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Taotao Qiu (Hua-Zhong Normal U.)
e-Print: 1709.03171 [gr-qc]
DOI: 10.1103/PhysRevD.96.083530
Published in: Phys.Rev.D 96 (2017) 8, 083530
No rescue for the no boundary proposal: Pointers to the future of quantum cosmology
Job Feldbrugge (Perimeter Inst. Theor. Phys.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Neil Turok (Perimeter Inst. Theor. Phys.)
e-Print: 1708.05104 [hep-th]
DOI: 10.1103/PhysRevD.97.023509
Published in: Phys.Rev.D 97 (2018) 2, 023509
No smooth beginning for spacetime
Job Feldbrugge (Perimeter Inst. Theor. Phys.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Neil Turok (Perimeter Inst. Theor. Phys.)
e-Print: 1705.00192 [hep-th]
DOI: 10.1103/PhysRevLett.119.171301
Published in: Phys.Rev.Lett. 119 (2017) 17, 171301
Lorentzian Quantum Cosmology
Job Feldbrugge (Perimeter Inst. Theor. Phys.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Neil Turok (Perimeter Inst. Theor. Phys.)
e-Print: 1703.02076 [hep-th]
DOI: 10.1103/PhysRevD.95.103508
Published in: Phys.Rev.D 95 (2017) 10, 103508
Wavefunction of anisotropic inflationary universes with no-boundary conditions
Sebastian F. Bramberger (Potsdam, Max Planck Inst.), Shane Farnsworth (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1701.05753 [hep-th]
DOI: 10.1103/PhysRevD.95.083513
Published in: Phys.Rev.D 95 (2017) 8, 083513
Quantum Transitions Through Cosmological Singularities
Sebastian F. Bramberger (Potsdam, Max Planck Inst.), Thomas Hertog (Leuven U.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Yannick Vreys (Leuven U.)
e-Print: 1701.05399 [hep-th]
DOI: 10.1088/1475-7516/2017/07/007
Published in: JCAP 07 (2017), 007
Converting entropy to curvature perturbations after a cosmic bounce
Angelika Fertig (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Enno Mallwitz (Potsdam, Max Planck Inst.), Edward Wilson-Ewing (Potsdam, Max Planck Inst.)
e-Print: 1607.05663 [hep-th]
DOI: 10.1088/1475-7516/2016/10/005
Published in: JCAP 10 (2016), 005
Quantum tunneling from paths in complex time
Sebastian F. Bramberger (Potsdam, Max Planck Inst.), George Lavrelashvili (Razmadze Math. Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1605.02751 [hep-th]
DOI: 10.1103/PhysRevD.94.064032
Published in: Phys.Rev.D 94 (2016) 6, 064032
Wormhole creation by quantum tunnelling
Lorenzo Battarra (Potsdam, Max Planck Inst.), George Lavrelashvili (Potsdam, Max Planck Inst. and Razmadze Math. Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1603.08728 [gr-qc]
DOI: 10.1142/9789813226609_0123
Published in:
Nonsingular bouncing cosmology: Consistency of the effective description
Michael Koehn (Pennsylvania U.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Burt Ovrut (Pennsylvania U.)
e-Print: 1512.03807 [hep-th]
DOI: 10.1103/PhysRevD.93.103501
Published in: Phys.Rev.D 93 (2016) 10, 103501
The Non-Minimal Ekpyrotic Trispectrum
Angelika Fertig (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1510.03439 [hep-th]
DOI: 10.1088/1475-7516/2016/01/026
Published in: JCAP 01 (2016), 026
Running of the scalar spectral index in bouncing cosmologies
Jean-Luc Lehners (Potsdam, Max Planck Inst.), Edward Wilson-Ewing (Potsdam, Max Planck Inst.)
e-Print: 1507.08112 [astro-ph.CO]
DOI: 10.1088/1475-7516/2015/10/038
Published in: JCAP 10 (2015), 038
Conflation: a new type of accelerated expansion
Angelika Fertig (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Enno Mallwitz (Potsdam, Max Planck Inst.)
e-Print: 1507.04742 [hep-th]
DOI: 10.1088/1475-7516/2016/08/073
Published in: JCAP 08 (2016), 073
Towards a Solution of the Negative Mode Problem in Quantum Tunnelling with Gravity
Michael Koehn (Pennsylvania U.), George Lavrelashvili (Razmadze Math. Inst. and Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1504.04334 [hep-th]
DOI: 10.1103/PhysRevD.92.023506
Published in: Phys.Rev.D 92 (2015) 2, 023506
New Ekpyrotic Quantum Cosmology
Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1504.02467 [hep-th]
DOI: 10.1016/j.physletb.2015.09.032
Published in: Phys.Lett.B 750 (2015), 242-246
Classical Inflationary and Ekpyrotic Universes in the No-Boundary Wavefunction
Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1502.00629 [hep-th]
DOI: 10.1103/PhysRevD.91.083525
Published in: Phys.Rev.D 91 (2015) 8, 083525
Creation of wormholes by quantum tunnelling in modified gravity theories
Lorenzo Battarra (Potsdam, Max Planck Inst.), George Lavrelashvili (Potsdam, Max Planck Inst. and Razmadze Math. Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1407.6026 [hep-th]
DOI: 10.1103/PhysRevD.90.124015
Published in: Phys.Rev.D 90 (2014) 12, 124015
On the No-Boundary Proposal for Ekpyrotic and Cyclic Cosmologies
Lorenzo Battarra (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1407.4814 [hep-th]
DOI: 10.1088/1475-7516/2014/12/023
Published in: JCAP 12 (2014), 023
On the Creation of the Universe via Ekpyrotic Instantons
Lorenzo Battarra (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1406.5896 [hep-th]
DOI: 10.1016/j.physletb.2015.01.028
Published in: Phys.Lett.B 742 (2015), 167-171
Cosmological Perturbations Through a Non-Singular Ghost-Condensate/Galileon Bounce
Lorenzo Battarra (Potsdam, Max Planck Inst.), Michael Koehn (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Burt A. Ovrut (Pennsylvania U.)
e-Print: 1404.5067 [hep-th]
DOI: 10.1088/1475-7516/2014/07/007
Published in: JCAP 07 (2014), 007
General mechanism for producing scale-invariant perturbations and small non-Gaussianity in ekpyrotic models
Anna Ijjas (Potsdam, Max Planck Inst. and Rutgers U., Piscataway), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Paul J. Steinhardt (Princeton U.)
e-Print: 1404.1265 [astro-ph.CO]
DOI: 10.1103/PhysRevD.89.123520
Published in: Phys.Rev.D 89 (2014) 12, 123520
Non-Canonical Inflation in Supergravity
Rhiannon Gwyn (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1402.5120 [hep-th]
DOI: 10.1007/JHEP05(2014)050
Published in: JHEP 05 (2014), 050
Scalars with Higher Derivatives in Supergravity and Cosmology
Michael Koehn (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Burt A. Ovrut (Pennsylvania U.)
DOI: 10.1007/978-3-319-03774-5_7
Published in: Springer Proc.Phys. 153 (2014), 115-143
Ghost Condensation in \(N=1\) Supergravity
Michael Koehn (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Burt Ovrut (Pennsylvania U.)
DOI: 10.1007/978-3-319-03774-5_9
Published in: Springer Proc.Phys. 153 (2014), 163-178
Ekpyrotic Perturbations With Small Non-Gaussian Corrections
Angelika Fertig (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Enno Mallwitz (Potsdam, Max Planck Inst.)
e-Print: 1310.8133 [hep-th]
DOI: 10.1103/PhysRevD.89.103537
Published in: Phys.Rev.D 89 (2014) 10, 103537
Cosmological super-bounce
Michael Koehn (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Burt A. Ovrut (Pennsylvania U.)
e-Print: 1310.7577 [hep-th]
DOI: 10.1103/PhysRevD.90.025005
Published in: Phys.Rev.D 90 (2014) 2, 025005
Quantum-to-classical transition for ekpyrotic perturbations
Lorenzo Battarra (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1309.2281 [hep-th]
DOI: 10.1103/PhysRevD.89.063516
Published in: Phys.Rev.D 89 (2014) 6, 063516
Zoology of instanton solutions in flat potential barriers
Lorenzo Battarra (Potsdam, Max Planck Inst.), George Lavrelashvili (Razmadze Math. Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1307.7954 [hep-th]
DOI: 10.1103/PhysRevD.88.104012
Published in: Phys.Rev.D 88 (2013), 104012
Planck 2013 results support the cyclic universe
Jean-Luc Lehners (Potsdam, Max Planck Inst.), Paul J. Steinhardt (Harvard-Smithsonian Ctr. Astrophys. and Princeton U. and Princeton U., CTP)
e-Print: 1304.3122 [astro-ph.CO]
DOI: 10.1103/PhysRevD.87.123533
Published in: Phys.Rev.D 87 (2013) 12, 123533
Supersymmetric cubic Galileons have ghosts
Michael Koehn (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Burt Ovrut (Pennsylvania U.)
e-Print: 1302.0840 [hep-th]
DOI: 10.1103/PhysRevD.88.023528
Published in: Phys.Rev.D 88 (2013) 2, 023528
Scalars with higher derivatives in supergravity and cosmology
Jean-Luc Lehners (Potsdam, Max Planck Inst.)
DOI: 10.22323/1.177.0118
Published in: PoS Corfu2012 (2013), 118
Ghost condensate in $N=1$ supergravity
Michael Koehn (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Burt Ovrut (Pennsylvania U.)
e-Print: 1212.2185 [hep-th]
DOI: 10.1103/PhysRevD.87.065022
Published in: Phys.Rev.D 87 (2013) 6, 065022
DBI Inflation in N=1 Supergravity
Michael Koehn (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Burt A. Ovrut (Pennsylvania U.)
e-Print: 1208.0752 [hep-th]
DOI: 10.1103/PhysRevD.86.123510
Published in: Phys.Rev.D 86 (2012), 123510
Negative Modes of Oscillating Instantons
Lorenzo Battarra (Potsdam, Max Planck Inst.), George Lavrelashvili (Razmadze Math. Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1208.2182 [hep-th]
DOI: 10.1103/PhysRevD.86.124001
Published in: Phys.Rev.D 86 (2012), 124001
Higher-Derivative Chiral Superfield Actions Coupled to N=1 Supergravity
Michael Koehn (Potsdam, Max Planck Inst.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Burt A. Ovrut (Pennsylvania U.)
e-Print: 1207.3798 [hep-th]
DOI: 10.1103/PhysRevD.86.085019
Published in: Phys.Rev.D 86 (2012), 085019
Eternal Inflation With Non-Inflationary Pocket Universes
Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1206.1081 [hep-th]
DOI: 10.1103/PhysRevD.86.043518
Published in: Phys.Rev.D 86 (2012), 043518
Cycles in the Multiverse
Matthew C. Johnson (Perimeter Inst. Theor. Phys.), Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1112.3360 [hep-th]
DOI: 10.1103/PhysRevD.85.103509
Published in: Phys.Rev.D 85 (2012), 103509
Diversity in the Phoenix Universe
Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1107.4551 [hep-th]
DOI: 10.1103/PhysRevD.84.103518
Published in: Phys.Rev.D 84 (2011), 103518
Cosmic Bounces and Cyclic Universes
Jean-Luc Lehners (Potsdam, Max Planck Inst.)
e-Print: 1106.0172 [hep-th]
DOI: 10.1088/0264-9381/28/20/204004
Published in: Class.Quant.Grav. 28 (2011), 204004
Supersymmetric Galileons
Justin Khoury (Pennsylvania U.), Jean-Luc Lehners (Potsdam, Max Planck Inst.), Burt A. Ovrut (Pennsylvania U.)
e-Print: 1103.0003 [hep-th]
DOI: 10.1103/PhysRevD.84.043521
Published in: Phys.Rev.D 84 (2011), 043521
Supersymmetric P(X,$\phi$) and the Ghost Condensate
Justin Khoury (Pennsylvania U.), Jean-Luc Lehners (Perimeter Inst. Theor. Phys. and Potsdam, Max Planck Inst.), Burt Ovrut (Pennsylvania U.)
e-Print: 1012.3748 [hep-th]
DOI: 10.1103/PhysRevD.83.125031
Published in: Phys.Rev.D 83 (2011), 125031
Dynamical Selection of the Primordial Density Fluctuation Amplitude
Jean-Luc Lehners (Princeton U., CTP), Paul J. Steinhardt (Princeton U., CTP and Princeton U.)
e-Print: 1008.4567 [hep-th]
DOI: 10.1103/PhysRevLett.106.081301
Published in: Phys.Rev.Lett. 106 (2011), 081301
Ekpyrotic Non-Gaussianity: A Review
Jean-Luc Lehners (Princeton U.)
e-Print: 1001.3125 [hep-th]
DOI: 10.1155/2010/903907
Published in: Adv.Astron. 2010 (2010), 903907
Non-Gaussianity Generated by the Entropic Mechanism in Bouncing Cosmologies Made Simple
Jean-Luc Lehners (Princeton U., CTP), Paul J. Steinhardt (Princeton U., CTP and Princeton U.)
e-Print: 0909.2558 [hep-th]
DOI: 10.1103/PhysRevD.80.103520
Published in: Phys.Rev.D 80 (2009), 103520
Multifield Cosmological Perturbations at Third Order and the Ekpyrotic Trispectrum
Jean-Luc Lehners (Princeton U., CTP), Sebastien Renaux-Petel (APC, Paris)
e-Print: 0906.0530 [hep-th]
DOI: 10.1103/PhysRevD.80.063503
Published in: Phys.Rev.D 80 (2009), 063503
The Return of the Phoenix Universe
Jean-Luc Lehners (Princeton U., CTP), Paul J. Steinhardt (Princeton U., CTP and Princeton U.), Neil Turok (Perimeter Inst. Theor. Phys.)
e-Print: 0910.0834 [hep-th]
DOI: 10.1142/S0218271809015977
Published in: Int.J.Mod.Phys.D 18 (2009), 2231-2235
Non-Gaussianity as a Probe of the Physics of the Primordial Universe and the Astrophysics of the Low Redshift Universe
E. Komatsu (Texas U. and Tokyo U.), N. Afshordi (Perimeter Inst. Theor. Phys.), N. Bartolo (Padua U.), D. Baumann (Harvard U.), J.R. Bond (Toronto U.) et al.
e-Print: 0902.4759 [astro-ph.CO]
Dark Energy and the Return of the Phoenix Universe
Jean-Luc Lehners (Princeton U., CTP), Paul J. Steinhardt (Princeton U., CTP and Princeton U.)
e-Print: 0812.3388 [hep-th]
DOI: 10.1103/PhysRevD.79.063503
Published in: Phys.Rev.D 79 (2009), 063503
Ekpyrotic and Cyclic Cosmology
Jean-Luc Lehners
e-Print: 0806.1245 [astro-ph]
DOI: 10.1016/j.physrep.2008.06.001
Published in: Phys.Rept. 465 (2008), 223-263
Intuitive understanding of non-gaussianity in ekpyrotic and cyclic models
Jean-Luc Lehners (Princeton U., CTP), Paul J. Steinhardt (Princeton U., CTP and Princeton U.)
e-Print: 0804.1293 [hep-th]
DOI: 10.1103/PhysRevD.78.023506 , 10.1103/PhysRevD.79.129902
Published in: Phys.Rev.D 78 (2008), 023506, Phys.Rev.D 79 (2009), 129902 (erratum)
Non-Gaussian density fluctuations from entropically generated curvature perturbations in Ekpyrotic models
Jean-Luc Lehners (Princeton U., CTP), Paul J. Steinhardt (Princeton U., CTP and Princeton U.)
e-Print: 0712.3779 [hep-th]
DOI: 10.1103/PhysRevD.77.063533 , 10.1103/PhysRevD.79.129903
Published in: Phys.Rev.D 77 (2008), 063533, Phys.Rev.D 79 (2009), 129903 (erratum)
Bouncing Negative-Tension Branes
Jean-Luc Lehners (Cambridge U., DAMTP), Neil Turok (Cambridge U., DAMTP)
e-Print: 0708.0743 [hep-th]
DOI: 10.1103/PhysRevD.77.023516
Published in: Phys.Rev.D 77 (2008), 023516
Bouncing and Colliding Branes
Jean-Luc Lehners (Cambridge U., DAMTP)
e-Print: 0708.2633 [hep-th]
DOI: 10.1063/1.2823796
Published in: AIP Conf.Proc. 957 (2007) 1, 337-340
Kaluza-Klein induced supersymmetry breaking for braneworlds in type IIB supergravity
Jean-Luc Lehners (Cambridge U., DAMTP), Paul Smyth (Leuven U.), K.S. Stelle (Imperial Coll., London)
e-Print: 0704.3343 [hep-th]
DOI: 10.1016/j.nuclphysb.2007.08.016
Published in: Nucl.Phys.B 790 (2008), 89-110
Generating ekpyrotic curvature perturbations before the big bang
Jean-Luc Lehners (Cambridge U., DAMTP), Paul McFadden (Amsterdam U.), Neil Turok (Cambridge U., DAMTP), Paul J. Steinhardt (Princeton U.)
e-Print: hep-th/0702153 [hep-th]
DOI: 10.1103/PhysRevD.76.103501
Published in: Phys.Rev.D 76 (2007), 103501
Effective Actions for Heterotic M-Theory
Jean-Luc Lehners (Cambridge U., DAMTP), Paul McFadden (Amsterdam U.), Neil Turok (Cambridge U., DAMTP)
e-Print: hep-th/0612026 [hep-th]
DOI: 10.1103/PhysRevD.76.023501
Published in: Phys.Rev.D 76 (2007), 023501
Colliding Branes in Heterotic M-theory
Jean-Luc Lehners (Cambridge U., DAMTP), Paul McFadden (Amsterdam U.), Neil Turok (Cambridge U., DAMTP)
e-Print: hep-th/0611259 [hep-th]
DOI: 10.1103/PhysRevD.75.103510
Published in: Phys.Rev.D 75 (2007), 103510
Stability of Horava-Witten spacetimes
J.-L. Lehners (Imperial Coll., London), P. Smyth (Imperial Coll., London and Leuven U.), K.S. Stelle (Imperial Coll., London)
e-Print: hep-th/0501212 [hep-th]
DOI: 10.1088/0264-9381/22/13/005
Published in: Class.Quant.Grav. 22 (2005), 2589-2606
D=5 M theory radion supermultiplet dynamics
Jean-Luc Lehners (Imperial Coll., London), K.S. Stelle (Imperial Coll., London)
e-Print: hep-th/0210228 [hep-th]
DOI: 10.1016/S0550-3213(03)00265-7
Published in: Nucl.Phys.B 661 (2003), 273-288