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C6 – Scalar Fields in Cosmology: Inflation, Dark Matter, Dark Energy



Project Leaders

Jan Louis (e-mail | group homepage)

Alexander Westphal (e-mail | group homepage)


Abstract

Scalar fields, moduli and dilaton, play a crucial role in effective low energy theories derived from string theory. Cosmologically, they are important for inflation and dark energy, and they also lead to the moduli problem and strong constraints on the history of the early universe. In this project we shall investigate the connections between cosmology and supergravity extensions of the Standard Model based on string theory. In particular we aim at the explicit realisation of inflation and sufficiently long-lived de Sitter vacua in string theory and at the study of their implications for the nature of Dark Matter. We also extend our investigations to explore the signatures of these supersymmetric models for LHC.


Researchers

Mafalda Dias

Andreas Ringwald


Former members

Ido Ben-Dayan

Clare Burrage

Koushik Dutta

Christian Groß

Gonzalo A. Palma

Markus Rummel


Former PI

Laura Covi



Publications


Get these publications as bibtex-file


"An Etude on Global Vacuum Energy Sequester"
D'Amico, Guido and Kaloper, Nemanja and Padilla, Antonio and Stefanyszyn, David and Westphal, Alexander and Zahariade, George
eprint: 1705.08950 [hep-th]

"Inflation with a graceful exit in a random landscape"
Pedro, Francisco G. and Westphal, Alexander
JHEP 03, 163 (2017)
doi: 10.1007/JHEP03(2017)163
eprint: 1611.07059 [hep-th]

"Nonequilibrium random matrix theory: Transition probabilities"
Pedro, Francisco Gil and Westphal, Alexander
Phys. Rev. E95, 032144 (2017)
doi: 10.1103/PhysRevE.95.032144
eprint: 1606.07768 [cond-mat.stat-mech]

"Runaway Relaxion Monodromy"
McAllister, Liam and Schwaller, Pedro and Servant, Geraldine and Stout, John and Westphal, Alexander
eprint: 1610.05320 [hep-th]

"Corrections to ns and nt from high scale physics"
Broy, Benedict J.
Phys. Rev. D94, 103508 (2016)
doi: 10.1103/PhysRevD.94.109901, 10.1103/PhysRevD.94.103508
eprint: 1609.03570 [hep-th]

"α' Inflation: moduli stabilisation and observable tensors from higher derivatives"
Cicoli, Michele and Ciupke, David and de Alwis, Senarath and Muia, Francesco
JHEP 09, 026 (2016)
doi: 10.1007/JHEP09(2016)026
eprint: 1607.01395 [hep-th]

"Scalar Potential from Higher Derivative N = 1 Superspace"
Ciupke, David
eprint: 1605.00651 [hep-th]

"Gravitational Waves in Bouncing Cosmologies from Gauge Field Production"
Ben-Dayan, Ido
JCAP 1609, 017 (2016)
doi: 10.1088/1475-7516/2016/09/017
eprint: 1604.07899 [astro-ph.CO]

"Plateau Inflation from Random Non-Minimal Coupling"
Broy, Benedict J. and Coone, Dries and Roest, Diederik
JCAP 1606, 036 (2016)
doi: 10.1088/1475-7516/2016/06/036
eprint: 1604.05326 [hep-th]

"Hypercharge Axion and the Diphoton 750 GeV Resonance"
Ben-Dayan, Ido and Brustein, Ram
eprint: 1601.07564 [hep-ph]

"Towards Axion Monodromy Inflation with Warped KK-Modes"
Hebecker, Arthur and Moritz, Jakob and Westphal, Alexander and Witkowski, Lukas T.
Phys. Lett. B754, 328-334 (2016)
doi: 10.1016/j.physletb.2017.02.029, 10.1016/j.physletb.2016.01.030
eprint: 1512.04463 [hep-th]

"Axion Monodromy and the Weak Gravity Conjecture"
Hebecker, Arthur and Rompineve, Fabrizio and Westphal, Alexander
JHEP 04, 157 (2016)
doi: 10.1007/JHEP04(2016)157
eprint: 1512.03768 [hep-th]

"Starobinsky-Type Inflation from α'-Corrections"
Broy, Benedict J. and Ciupke, David and Pedro, Francisco G. and Westphal, Alexander
JCAP 1601, 001 (2016)
doi: 10.1088/1475-7516/2016/01/001
eprint: 1509.00024 [hep-th]

"Vacuum energy sequestering and conformal symmetry"
Ben-Dayan, Ido and Richter, Robert and Ruehle, Fabian and Westphal, Alexander
JCAP 1605, 002 (2016)
doi: 10.1088/1475-7516/2016/05/002
eprint: 1507.04158 [hep-th]

"Constraints on small-scale cosmological fluctuations from SNe lensing dispersion"
Ben-Dayan, Ido and Takahashi, Ryuichi
Mon. Not. Roy. Astron. Soc. 455, 552-562 (2016)
doi: 10.1093/mnras/stv2356
eprint: 1504.07273 [astro-ph.CO]

"Impact of cosmic variance on the local measurement of H0"
Marozzi, Giovanni and Ben-Dayan, Ido and Durrer, Ruth and Schwarz, Dominik J.
Proceedings, 14th International Symposium Frontiers of Fundamental Physics FFP14: Marseille, France, July 15-18, 2014, PoS (2016)
[ link ]

"Gravitational Waves in the Early Universe from Gauge Field Production"
Ben-Dayan, Ido
Proceedings, 51st Rencontres de Moriond, Cosmology session: La Thuile, Italy, March 19-26, 2016, ARISF (2016)
[ link ]

"Classification of Shift-Symmetric No-Scale Supergravities"
Ciupke, David and Zarate, Lucila
JHEP 11, 179 (2015)
doi: 10.1007/JHEP11(2015)179
eprint: 1509.00855 [hep-th]

"Pole inflation — Shift symmetry and universal corrections"
Broy, Benedict J. and Galante, Mario and Roest, Diederik and Westphal, Alexander
JHEP 12, 149 (2015)
doi: 10.1007/JHEP12(2015)149
eprint: 1507.02277 [hep-th]

"Higher-Derivative Supergravity and Moduli Stabilization"
Ciupke, David and Louis, Jan and Westphal, Alexander
JHEP 10, 094 (2015)
doi: 10.1007/JHEP10(2015)094
eprint: 1505.03092 [hep-th]

"Bifid Throats for Axion Monodromy Inflation"
Retolaza, Ander and Uranga, Angel M. and Westphal, Alexander
JHEP 07, 099 (2015)
doi: 10.1007/JHEP07(2015)099
eprint: 1504.02103 [hep-th]

"Challenges for Large-Field Inflation and Moduli Stabilization"
Buchmuller, Wilfried and Dudas, Emilian and Heurtier, Lucien and Westphal, Alexander and Wieck, Clemens and Winkler, Martin Wolfgang
JHEP 04, 058 (2015)
doi: 10.1007/JHEP04(2015)058
eprint: 1501.05812 [hep-th]

"Disentangling the fR - Duality"
Broy, Benedict J. and Pedro, Francisco G. and Westphal, Alexander
JCAP 1503, 029 (2015)
doi: 10.1088/1475-7516/2015/03/029
eprint: 1411.6010 [hep-th]

"On Soft Limits of Large-Scale Structure Correlation Functions"
Ben-Dayan, Ido and Konstandin, Thomas and Porto, Rafael A. and Sagunski, Laura
JCAP 1502, 026 (2015)
doi: 10.1088/1475-7516/2015/02/026
eprint: 1411.3225 [astro-ph.CO]

"String cosmology — Large-field inflation in string theory"
Westphal, Alexander
Int. J. Mod. Phys. A30, 1530024 (2015)
doi: 10.1142/S0217751X15300240
eprint: 1409.5350 [hep-th]

"Power Spectrum of Inflationary Attractors"
Broy, Benedict J. and Roest, Diederik and Westphal, Alexander
Phys. Rev. D91, 023514 (2015)
doi: 10.1103/PhysRevD.91.023514
eprint: 1408.5904 [hep-th]

"Towards Natural Inflation in String Theory"
Ben-Dayan, Ido and Pedro, Francisco G. and Westphal, Alexander
Phys. Rev. D92, 023515 (2015)
doi: 10.1103/PhysRevD.92.023515
eprint: 1407.2562 [hep-th]

"String Cosmology — Large-Field Inflation in String Theory"
Westphal, Alexander
Adv. Ser. Direct. High Energy Phys. 22, 351-384 (2015)
doi: 10.1142/9789814602686_0012

"Drifting Oscillations in Axion Monodromy"
Flauger, Raphael and McAllister, Liam and Silverstein, Eva and Westphal, Alexander
eprint: 1412.1814 [hep-th]

"Lensing dispersion of SNIa and small scales of the primordial power spectrum"
Ben-Dayan, Ido
Proceedings, 49th Rencontres de Moriond on Cosmology: La Thuile, Italy, March 15-22, 2014 (2014)
eprint: 1408.3004 [astro-ph.CO] [ link ]

"Just enough inflation: power spectrum modifications at large scales"
Cicoli, Michele and Downes, Sean and Dutta, Bhaskar and Pedro, Francisco G. and Westphal, Alexander
JCAP 1412, 030 (2014)
doi: 10.1088/1475-7516/2014/12/030
eprint: 1407.1048 [hep-th]

"The Powers of Monodromy"
McAllister, Liam and Silverstein, Eva and Westphal, Alexander and Wrase, Timm
JHEP 09, 123 (2014)
doi: 10.1007/JHEP09(2014)123
eprint: 1405.3652 [hep-th]

"Chaotic Inflation in Supergravity after Planck and BICEP2"
Kallosh, Renata and Linde, Andrei and Westphal, Alexander
Phys. Rev. D90, 023534 (2014)
doi: 10.1103/PhysRevD.90.023534
eprint: 1405.0270 [hep-th]

"Hierarchical Axion Inflation"
Ben-Dayan, Ido and Pedro, Francisco Gil and Westphal, Alexander
Phys. Rev. Lett. 113, 261301 (2014)
doi: 10.1103/PhysRevLett.113.261301
eprint: 1404.7773 [hep-th]

"R2 log R quantum corrections and the inflationary observables"
Ben-Dayan, Ido and Jing, Shenglin and Torabian, Mahdi and Westphal, Alexander and Zarate, Lucila
JCAP 1409, 005 (2014)
doi: 10.1088/1475-7516/2014/09/005
eprint: 1404.7349 [hep-th]

"The value of H0 in the inhomogeneous Universe"
Ben-Dayan, Ido and Durrer, Ruth and Marozzi, Giovanni and Schwarz, Dominik J.
Phys. Rev. Lett. 112, 221301 (2014)
doi: 10.1103/PhysRevLett.112.221301
eprint: 1401.7973 [astro-ph.CO]

"Moduli spaces in AdS4 supergravity"
de Alwis, Senarath and Louis, Jan and McAllister, Liam and Triendl, Hagen and Westphal, Alexander
JHEP 05, 102 (2014)
doi: 10.1007/JHEP05(2014)102
eprint: 1312.5659 [hep-th]

"Constraining the primordial power spectrum from SNIa lensing dispersion"
Ben-Dayan, Ido and Kalaydzhyan, Tigran
Phys. Rev. D90, 083509 (2014)
doi: 10.1103/PhysRevD.90.083509
eprint: 1309.4771 [astro-ph.CO]

"Low-ℓ CMB power loss in string inflation"
Pedro, Francisco G. and Westphal, Alexander
JHEP 04, 034 (2014)
doi: 10.1007/JHEP04(2014)034
eprint: 1309.3413 [hep-th]

"Accidental inflation from Kähler uplifting"
Ben-Dayan, Ido and Jing, Shenglin and Westphal, Alexander and Wieck, Clemens
JCAP 1403, 054 (2014)
doi: 10.1088/1475-7516/2014/03/054
eprint: 1309.0529 [hep-th]

"Extended No-Scale Structure and α'2 Corrections to the Type IIB Action"
Pedro, Francisco G. and Rummel, Markus and Westphal, Alexander
eprint: 1306.1237 [hep-th]

"Heterotic Moduli Stabilisation"
Cicoli, Michele and de Alwis, Senarath and Westphal, Alexander
JHEP 10, 199 (2013)
doi: 10.1007/JHEP10(2013)199
eprint: 1304.1809 [hep-th]

"Average and dispersion of the luminosity-redshift relation in the concordance model"
Ben-Dayan, I. and Gasperini, M. and Marozzi, G. and Nugier, F. and Veneziano, G.
JCAP 1306, 002 (2013)
doi: 10.1088/1475-7516/2013/06/002
eprint: 1302.0740 [astro-ph.CO]

"Finding all flux vacua in an explicit example"
Martinez-Pedrera, Danny and Mehta, Dhagash and Rummel, Markus and Westphal, Alexander
JHEP 1306, 110 (2013)
doi: 10.1007/JHEP06(2013)110
eprint: 1212.4530 [hep-th]

"Relations between canonical and non-canonical inflation"
Gwyn, Rhiannon and Rummel, Markus and Westphal, Alexander
JCAP 1312, 010 (2013)
doi: 10.1088/1475-7516/2013/12/010
eprint: 1212.4135 [hep-th]

"Resonant non-Gaussianity with equilateral properties"
Gwyn, Rhiannon and Rummel, Markus and Westphal, Alexander
JCAP 1304, 040 (2013)
doi: 10.1088/1475-7516/2013/04/040
eprint: 1211.0070 [hep-th]

"Metastable Electroweak Vacuum: Implications for Inflation"
Lebedev, Oleg and Westphal, Alexander
Phys.Lett. B719, 415-418 (2013)
doi: 10.1016/j.physletb.2012.12.069
eprint: 1210.6987 [hep-ph]

"Building an explicit de Sitter"
Louis, Jan and Rummel, Markus and Valandro, Roberto and Westphal, Alexander
JHEP 1210, 163 (2012)
doi: 10.1007/JHEP10(2012)163
eprint: 1208.3208 [hep-th]

"Validity of the kink approximation to the tunneling action"
Dutta, Koushik and Hector, Cecelie and Konstandin, Thomas and Vaudrevange, Pascal M. and Westphal, Alexander
Phys.Rev. D86, 123517 (2012)
doi: 10.1103/PhysRevD.86.123517
eprint: 1202.2721 [hep-th]

"More Exact Tunneling Solutions in Scalar Field Theory"
Dutta, Koushik and Hector, Cecelie and Vaudrevange, Pascal M. and Westphal, Alexander
Phys.Lett. B708, 309-313 (2012)
doi: 10.1016/j.physletb.2012.01.026
eprint: 1110.2380 [hep-th]

"The Overshoot Problem in Inflation after Tunneling"
Dutta, Koushik and Vaudrevange, Pascal M. and Westphal, Alexander
JCAP 1201, 026 (2012)
doi: 10.1088/1475-7516/2012/01/026
eprint: 1109.5182 [hep-th]

"A sufficient condition for de Sitter vacua in type IIB string theory"
Rummel, Markus and Westphal, Alexander
JHEP 1201, 020 (2012)
doi: 10.1007/JHEP01(2012)020
eprint: 1107.2115 [hep-th]

"Collider constraints on interactions of dark energy with the Standard Model"
Brax, Philippe and Burrage, Clare and Davis, Anne-Christine and Seery, David and Weltman, Amanda
JHEP 09, 128 (2009)
doi: 10.1088/1126-6708/2009/09/128
eprint: 0904.3002 [hep-ph]

"Active Galactic Nuclei Shed Light on Axion-like- Particles"
Burrage, Clare and Davis, Anne-Christine and Shaw, Douglas J.
Phys. Rev. Lett. 102, 201101 (2009)
doi: 10.1103/PhysRevLett.102.201101
eprint: 0902.2320 [astro-ph.CO]

"Constructing de Sitter vacua in no-scale string models without uplifting"
Covi, Laura and Gomez-Reino, Marta and Gross, Christian and Palma, Gonzalo A. and Scrucca, Claudio A.
JHEP 03, 146 (2009)
doi: 10.1088/1126-6708/2009/03/146
eprint: 0812.3864 [hep-th]

"No metastable de Sitter vacua in N=2 supergravity with only hypermultiplets"
Gomez-Reino, Marta and Louis, Jan and Scrucca, Claudio A.
JHEP 02, 003 (2009)
doi: 10.1088/1126-6708/2009/02/003
eprint: 0812.0884 [hep-th]

"Constraints on modular inflation in supergravity and string theory"
Covi, Laura and others
JHEP 08, 055 (2008)
doi: 10.1088/1126-6708/2008/08/055
eprint: 0805.3290 [hep-th]

"de Sitter vacua in no-scale supergravities and Calabi-Yau string models"
Covi, Laura and others
JHEP 06, 057 (2008)
doi: 10.1088/1126-6708/2008/06/057
eprint: 0804.1073 [hep-th]


Theses


PhD thesis: "Higher-Derivative Supergravity and String Cosmology"
Ciupke, David
Universität Hamburg (2016)
doi: 10.3204/PUBDB-2016-03670
[ link ]

PhD thesis: "Inflation and Effective Shift Symmetries"
Broy, Benedict Johannes
Universität Hamburg (2016)
doi: 10.3204/PUBDB-2016-03859
[ link ]

PhD thesis: "Vacua and Inflation in String Theory and Supergravity"
Rummel, Markus
Universität Hamburg (2013)
[ link ]

PhD thesis: "De Sitter vacua and inflation in no-scale string models"
Gross, Christian
Universität Hamburg (2009)
[ link ]

Impressum  | last modified 30 May 2017