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Dr Hidde Jense
(he/him)
Teams and roles for Hidde Jense
Research Associate
Research student
Overview
I am a post-graduate research student, working on Cosmology with Prof. Erminia Calabrese since October 2020. Before this, I obtained both my Bachelor's and Master's degrees at Leiden University, graduating with my Master's thesis on an Effective Field Theory description of Multi-Field Inflation.
Within my PhD research, I am working with observations of the CMB by the Atacama Cosmology Telescope (ACT) and the Simons Observatory (SO) collaboration. Within these collaborations, I work on the pipeline for foreground extraction and cosmological parameter estimation.
I have recently written a WMAP likelihood and a Planck likelihood for combined experiments (i.e. ACT+WMAP, ACT+Planck, etc.).
Apart from cosmology, I am always interested in talking about linguistics, where my main interest lies in the languages of the Near East during the pre-Classical era (specifically Old-Persian, Ugaritic and Sumerian are a focus of my current studies).
Publication
2025
- Atkins, Z. et al. 2025. The Atacama Cosmology Telescope: semi-analytic covariance matrices for the DR6 CMB power spectra. Journal of Cosmology and Astroparticle Physics 2025(5), article number: 15. (10.1088/1475-7516/2025/05/015)
- Giardiello, S., Ade, P., Calabrese, E., Harrison, I., Jense, H. and Tucker, C. 2025. The Atacama Cosmology Telescope: DR6 maps. [Online]. ArXiv: Cornell university. (10.48550/arXiv.2503.14451) Available at: https://doi.org/10.48550/arXiv.2503.14451
- Giardiello, S., Calabrese, E., Jense, H., Ade, P., Harrison, I. and Tucker, C. 2025. The Atacama Cosmology Telescope: DR6 constraints on extended cosmological models. [Online]. ArXiv: Cornell university. (10.48550/arXiv.2503.14454) Available at: https://doi.org/10.48550/arXiv.2503.14454
- Jense, H., Harrison, I., Calabrese, E., Mancini, A. S., Bolliet, B., Dunkley, J. and Hill, J. 2025. A complete framework for cosmological emulation and inference with CosmoPower. RAS Techniques and Instruments 4, article number: rzaf002. (10.1093/rasti/rzaf002)
2024
- Jense, H. 2024. Precision cosmology from small-scale CMB observations. PhD Thesis, Cardiff University.
- Giardiello, S. et al. 2024. The Simons Observatory: impact of bandpass, polarization angle and calibration uncertainties on small-scale power spectrum analysis. Journal of Cosmology and Astroparticle Physics 2024, article number: 8. (10.1088/1475-7516/2024/09/008)
- Bolliet, B., Spurio Mancini, A., Hill, J. C., Madhavacheril, M., Jense, H. T., Calabrese, E. and Dunkley, J. 2024. High-accuracy emulators for observables in ΛCDM, Neff, Σmν, and w cosmologies. Monthly Notices of the Royal Astronomical Society 531(1), pp. 1351–1370. (10.1093/mnras/stae1201)
- Coulton, W. et al. 2024. Atacama cosmology telescope: High-resolution component-separated maps across one third of the sky. Physical Review D (particles, fields, gravitation, and cosmology) 109(6), article number: 63530. (10.1103/PhysRevD.109.063530)
- Qu, F. J. et al. 2024. The Atacama Cosmology Telescope: A measurement of the DR6 CMB lensing power spectrum and its implications for structure growth. Astrophysical Journal 962(2), article number: 112. (10.3847/1538-4357/acfe06)
- Madhavacheril, M. S. et al. 2024. The Atacama Cosmology Telescope: DR6 gravitational lensing map and cosmological parameters. Astrophysical Journal 962(2), article number: 113. (10.3847/1538-4357/acff5f)
2023
- Li, Z. et al. 2023. The Simons Observatory: a new open-source power spectrum pipeline applied to the Planck legacy data. Journal of Cosmology and Astroparticle Physics 2023(9), article number: 48. (10.1088/1475-7516/2023/09/048)
Articles
- Atkins, Z. et al. 2025. The Atacama Cosmology Telescope: semi-analytic covariance matrices for the DR6 CMB power spectra. Journal of Cosmology and Astroparticle Physics 2025(5), article number: 15. (10.1088/1475-7516/2025/05/015)
- Jense, H., Harrison, I., Calabrese, E., Mancini, A. S., Bolliet, B., Dunkley, J. and Hill, J. 2025. A complete framework for cosmological emulation and inference with CosmoPower. RAS Techniques and Instruments 4, article number: rzaf002. (10.1093/rasti/rzaf002)
- Giardiello, S. et al. 2024. The Simons Observatory: impact of bandpass, polarization angle and calibration uncertainties on small-scale power spectrum analysis. Journal of Cosmology and Astroparticle Physics 2024, article number: 8. (10.1088/1475-7516/2024/09/008)
- Bolliet, B., Spurio Mancini, A., Hill, J. C., Madhavacheril, M., Jense, H. T., Calabrese, E. and Dunkley, J. 2024. High-accuracy emulators for observables in ΛCDM, Neff, Σmν, and w cosmologies. Monthly Notices of the Royal Astronomical Society 531(1), pp. 1351–1370. (10.1093/mnras/stae1201)
- Coulton, W. et al. 2024. Atacama cosmology telescope: High-resolution component-separated maps across one third of the sky. Physical Review D (particles, fields, gravitation, and cosmology) 109(6), article number: 63530. (10.1103/PhysRevD.109.063530)
- Qu, F. J. et al. 2024. The Atacama Cosmology Telescope: A measurement of the DR6 CMB lensing power spectrum and its implications for structure growth. Astrophysical Journal 962(2), article number: 112. (10.3847/1538-4357/acfe06)
- Madhavacheril, M. S. et al. 2024. The Atacama Cosmology Telescope: DR6 gravitational lensing map and cosmological parameters. Astrophysical Journal 962(2), article number: 113. (10.3847/1538-4357/acff5f)
- Li, Z. et al. 2023. The Simons Observatory: a new open-source power spectrum pipeline applied to the Planck legacy data. Journal of Cosmology and Astroparticle Physics 2023(9), article number: 48. (10.1088/1475-7516/2023/09/048)
Thesis
- Jense, H. 2024. Precision cosmology from small-scale CMB observations. PhD Thesis, Cardiff University.
Websites
- Giardiello, S., Ade, P., Calabrese, E., Harrison, I., Jense, H. and Tucker, C. 2025. The Atacama Cosmology Telescope: DR6 maps. [Online]. ArXiv: Cornell university. (10.48550/arXiv.2503.14451) Available at: https://doi.org/10.48550/arXiv.2503.14451
- Giardiello, S., Calabrese, E., Jense, H., Ade, P., Harrison, I. and Tucker, C. 2025. The Atacama Cosmology Telescope: DR6 constraints on extended cosmological models. [Online]. ArXiv: Cornell university. (10.48550/arXiv.2503.14454) Available at: https://doi.org/10.48550/arXiv.2503.14454
Research
I am very much interested in Cosmology, both from a theoretical and observational aspect.
I am currently working within the Simons Observatory (SO) collaboration and on the observations of the CMB by the Atacama Cosmology Telescope (ACT).
Teaching
Demonstrator:
- Experimental Physics (PX1150, 2020-2023)
Biography
Professional memberships
- Atacama Cosmology Telescope (ACT) (2020-Present)
- Simons Observatory (SO) (2020-Present)
Contact Details
Research themes
Specialisms
- Cosmology and extragalactic astronomy
