By Dr Jan Hamann

Journal articles

Finelli F; Hamann J; Leach SM; Lesgourgues J, 2010, 'Single-field inflation constraints from CMB and SDSS data', JCAP, 1004, pp. 011 - 011, http://dx.doi.org/10.1088/1475-7516/2010/04/011

Hamann J; Hannestad S; Raffelt GG; Wong YYY, 2009, 'Isocurvature forecast in the anthropic axion window', JCAP, 0906, pp. 022 - 022, http://dx.doi.org/10.1088/1475-7516/2009/06/022

Hamann J; Balbi A; Lesgourgues J; Quercellini C, 2009, 'Optimising Boltzmann codes for the Planck era', JCAP, 0904, pp. 011 - 011, http://dx.doi.org/10.1088/1475-7516/2009/04/011

Hamann J; Wong YYY, 2008, 'Effects of CMB temperature uncertainties on cosmological parameter estimation', JCAP, 0803, pp. 025 - 025, http://dx.doi.org/10.1088/1475-7516/2008/03/025

Hamann J; Lesgourgues J; Valkenburg W, 2008, 'How to constrain inflationary parameter space with minimal priors', JCAP, 0804, pp. 016 - 016, http://dx.doi.org/10.1088/1475-7516/2008/04/016

Valkenburg W; Hamann J; Krauss LM, 2008, 'Impact of prior assumptions on Bayesian estimates of inflation parameters and the expected gravitational waves signal from inflation', Phys. Rev., D78, pp. 063521 - 063521, http://dx.doi.org/10.1103/PhysRevD.78.063521

Hamann J; Hannestad S; Melchiorri A; Wong YYY, 2008, 'Nonlinear corrections to the cosmological matter power spectrum and scale-dependent galaxy bias: Implications for parameter estimation', JCAP, 0807, pp. 017 - 017, http://dx.doi.org/10.1088/1475-7516/2008/07/017

Hamann J; Hannestad S; Sloth MS; Wong YYY, 2008, 'Observing trans-Planckian ripples in the primordial power spectrum with future large scale structure probes', JCAP, 0809, pp. 015 - 015, http://dx.doi.org/10.1088/1475-7516/2008/09/015

Hamann J; Lesgourgues J; Mangano G, 2008, 'Using BBN in cosmological parameter extraction from CMB: A Forecast for PLANCK', JCAP, 0803, pp. 004 - 004, http://dx.doi.org/10.1088/1475-7516/2008/03/004

Hamann J; Hannestad S; Sloth MS; Wong YYY, 2007, 'How robust are inflation model and dark matter constraints from cosmological data?', Phys. Rev., D75, pp. 023522 - 023522, http://dx.doi.org/10.1103/PhysRevD.75.023522

Hamann J; Covi L; Melchiorri A; Slosar A, 2007, 'New Constraints on Oscillations in the Primordial Spectrum of Inflationary Perturbations', Phys. Rev., D76, pp. 023503 - 023503, http://dx.doi.org/10.1103/PhysRevD.76.023503

Hamann J; Hannestad S; Raffelt GG; Wong YYY, 2007, 'Observational bounds on the cosmic radiation density', Journal of Cosmology and Astroparticle Physics, 0708, pp. 021 - 021, http://dx.doi.org/10.1088/1475-7516/2007/08/021

Covi L; Hamann J; Melchiorri A; Slosar A; Sorbera I, 2006, 'Inflation and WMAP three year data: Features have a Future!', Phys. Rev., D74, pp. 083509 - 083509, http://dx.doi.org/10.1103/PhysRevD.74.083509

Conference Papers

Hannestad S; Hamann J; Mirizzi A; Raffelt GG; Wong YYY, 2009, 'Cosmological axion bounds', in Proceedings, 5th Patras Workshop on Axions, WIMPs and WISPs (AXION-WIMP 2009): Durham, UK, July 13-17, 2009, pp. 141 - 144, http://dx.doi.org/10.3204/DESY-PROC-2009-05/hannestad_steen

Theses / Dissertations

Hamann J, 2007, Inflation and Cosmological Parameter Estimation, Hamburg U., http://dx.doi.org/10.3204/DESY-THESIS-2007-016

Working Papers

Yi K; Chen J; Zhou B; Lio P; Fan Y; Hamann J, 2022, Approximate Equivariance SO(3) Needlet Convolution, http://dx.doi.org, https://arxiv.org/abs/2206.10385

Hamann J; Gia QTL; Sloan IH; Wang YG; Womersley RS, 2019, A New Probe of Gaussianity and Isotropy applied to the CMB Maps, http://dx.doi.org, https://arxiv.org/abs/1911.11442v2

Preprints

Cohen N; Hamann J, 2026, (The) Wiggles going non-linear, https://arxiv.org/abs/2605.30953v2

Kang Y; Bin H; Li D; Hamann J, 2026, TUNeS: Neural Emulation of Large-Scale Structure Across Redshifts, https://arxiv.org/abs/2603.18165v1

Cohen N; Hamann J; Malhotra A, 2026, Bayesian optimisation for Bayesian evidence (BOBE) -- a fast and efficient likelihood emulator for model selection, https://arxiv.org/abs/2601.11150v1

Hamann J; Kang Y, 2024, Non-Gaussianity in CMB lensing from full-sky simulations, https://arxiv.org/abs/2411.02774v3

Hamann J; Gia QTL; Sloan IH; Womersley RS, 2024, Removing the mask -- reconstructing a scalar field on the sphere from a masked field, http://dx.doi.org/10.48550/arxiv.2309.14815

Hamann J; Kang Y, 2023, A Minkowski Functional Analysis of the Cosmic Microwave Background Weak Lensing Convergence, https://doi.org/10.1088/1475-7516/2024/05/076

Deshpande M; Hamann J; Sengupta D; White M; Williams AG; Wong YYY, 2023, Revisiting Cosmological Constraints on Supersymmetric SuperWIMPs, http://dx.doi.org/10.48550/arxiv.2309.05709

Wons J; Dimastrogiovanni E; Fasiello M; Hamann J; Johnson MC, 2023, Enhancing Bispectrum Estimators for Galaxy Redshift Surveys with Velocities, https://doi.org/10.1103/PhysRevD.108.L021305

Hamann J; Malhotra A, 2022, Constraining primordial tensor features with the anisotropies of the Cosmic Microwave Background, https://doi.org/10.1088/1475-7516/2022/12/015

Yi K; Chen J; Wang YG; Zhou B; Liò P; Fan Y; Hamann J, 2022, Approximate Equivariance SO(3) Needlet Convolution, http://dx.doi.org/10.48550/arxiv.2206.10385

Hamann J; Wons J, 2021, Optimising Inflationary Features the Bayesian Way, https://doi.org/10.1088/1475-7516/2022/03/036

Hamann J; Gia QTL; Sloan IH; Wang YG; Womersley RS, 2020, A New Probe of Gaussianity and Isotropy applied to the CMB Maps, http://dx.doi.org/10.48550/arxiv.1911.11442

Yi K; Guo Y; Fan Y; Hamann J; Wang YG, 2020, CosmoVAE: Variational Autoencoder for CMB Image Inpainting, https://arxiv.org/abs/2001.11651v1

Poulter H; Ali-Haïmoud Y; Hamann J; White M; Williams AG, 2019, CMB constraints on ultra-light primordial black holes with extended mass distributions, https://arxiv.org/abs/1907.06485v1

Aghamousa A; Hamann J; Shafieloo A, 2017, A non-parametric consistency test of the $Λ$CDM model with Planck CMB data, https://doi.org/10.1088/1475-7516/2017/09/031

Xu Y; Hamann J; Chen X, 2016, Precise measurements of inflationary features with 21 cm observations, https://doi.org/10.1103/PhysRevD.94.123518

Chluba J; Hamann J; Patil SP, 2015, Features and New Physical Scales in Primordial Observables: Theory and Observation, https://doi.org/10.1142/S0218271815300232

Archidiacono M; Basse T; Hamann J; Hannestad S; Raffelt G; Wong YYY, 2015, Future cosmological sensitivity for hot dark matter axions, http://dx.doi.org/10.48550/arxiv.1502.03325

Basse T; Hamann J; Hannestad S; Wong YYY, 2014, Getting leverage on inflation with a large photometric redshift survey, http://dx.doi.org/10.48550/arxiv.1409.3469

Basse T; Bjaelde OE; Hamann J; Hannestad S; Wong YYY, 2014, Dark energy properties from large future galaxy surveys, http://dx.doi.org/10.48550/arxiv.1304.2321

Hamann J; Hasenkamp J, 2013, A new life for sterile neutrinos: resolving inconsistencies using hot dark matter, https://doi.org/10.1088/1475-7516/2013/10/044

Arina C; Hamann J; Trotta R; Wong YYY, 2012, Evidence for dark matter modulation in CoGeNT?, http://dx.doi.org/10.48550/arxiv.1111.3238

Hamann J, 2011, Evidence for extra radiation? Profile likelihood versus Bayesian posterior, https://doi.org/10.1088/1475-7516/2012/03/021

Hamann J; Hannestad S; Raffelt GG; Wong YYY, 2011, Sterile neutrinos with eV masses in cosmology -- how disfavoured exactly?, http://dx.doi.org/10.48550/arxiv.1108.4136

Arina C; Hamann J; Wong YYY, 2011, A Bayesian view of the current status of dark matter direct searches, http://dx.doi.org/10.48550/arxiv.1105.5121

Hamann J; Hannestad S; Raffelt GG; Tamborra I; Wong YYY, 2010, Cosmology seeking friendship with sterile neutrinos, http://dx.doi.org/10.48550/arxiv.1006.5276

Hamann J; Hannestad S; Lesgourgues J; Rampf C; Wong YYY, 2010, Cosmological parameters from large scale structure - geometric versus shape information, http://dx.doi.org/10.48550/arxiv.1003.3999

Hamann J; Shafieloo A; Souradeep T, 2009, Features in the primordial power spectrum? A frequentist analysis, https://doi.org/10.1088/1475-7516/2010/04/010

Finelli F; Hamann J; Leach SM; Lesgourgues J, 2009, Single-field inflation constraints from CMB and SDSS data, https://doi.org/10.1088/1475-7516/2010/04/011

Hannestad S; Hamann J; Mirizzi A; Raffelt GG; Wong YYY, 2009, Cosmological axion bounds, http://dx.doi.org/10.48550/arxiv.0910.5706

Hamann J; Hannestad S; Raffelt GG; Wong YYY, 2009, Isocurvature forecast in the anthropic axion window, http://dx.doi.org/10.48550/arxiv.0904.0647

Hamann J; Balbi A; Lesgourgues J; Quercellini C, 2009, Optimising Boltzmann codes for the Planck era, https://doi.org/10.1088/1475-7516/2009/04/011

Hamann J; Hannestad S; Sloth MS; Wong YYY, 2008, Observing trans-Planckian ripples in the primordial power spectrum with future large scale structure probes, http://dx.doi.org/10.48550/arxiv.0807.4528

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