![Giulio Fabbian](https://profiles-cardiff.imgix.net/attachments/3740?w=200&h=200&auto=format&crop=faces&fit=crop&q=90")
Overview
I am a cosmologist interested in studying open problems in fundamental physics and astrophysics with observations of the Cosmic Microwave Background and of the large-scale structures of the universe via the gravitational lensing effect.
Publication
2024
- Zhou, A. J., Li, Y., Dodelson, S., Mandelbaum, R., Zhang, Y., Li, X. and Fabbian, G. 2024. A Hamiltonian, post-Born, three-dimensional, on-the-fly ray tracing algorithm for gravitational lensing. Journal of Cosmology and Astroparticle Physics 2024(10), article number: 69. (10.1088/1475-7516/2024/10/069)
- 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)
- Braithwaite, C. et al. 2024. A study on the performance of half-wave plates designed for sub-mm studies. Presented at: SPIE Astronomical Telescopes + Instrumentation, Yokohama, Japan, 15-20 June 2024Proc. SPIE 13096: Ground-based and Airborne Instrumentation for Astronomy X. SPIE, (10.1117/12.3019262)
- Wolz, K. et al. 2024. The Simons Observatory: Pipeline comparison and validation for large-scale B-modes. Astronomy & Astrophysics 686, article number: A16. (10.1051/0004-6361/202346105)
- Piccirilli, G., Fabbian, G., Alonso, D., Storey-Fisher, K., Carron, J., Lewis, A. and García-García, C. 2024. Growth history and quasar bias evolution at z < 3 from Quaia. Journal of Cosmology and Astroparticle Physics 2024(6), article number: 12. (10.1088/1475-7516/2024/06/012)
- Zagatti, G., Bortolami, M., Gruppuso, A., Natoli, P., Pagano, L. and Fabbian, G. 2024. Planck constraints on cosmic birefringence and its cross-correlation with the CMB. Journal of Cosmology and Astroparticle Physics 2024(5), article number: 34. (10.1088/1475-7516/2024/05/034)
- Storey-Fisher, K., Hogg, D. W., Rix, H., Eilers, A., Fabbian, G., Blanton, M. R. and Alonso, D. 2024. Quaia, the Gaia-unWISE quasar catalog: an all-sky spectroscopic quasar sample. Astrophysical Journal 964, article number: 69. (10.3847/1538-4357/ad1328)
- Dachlythra, N. et al. 2024. The Simons Observatory: Beam characterization for the small aperture telescopes. Astrophysical Journal 961(1), article number: 138. (10.3847/1538-4357/ad0969)
- Adachi, S. et al. 2024. Exploration of the polarization angle variability of the Crab Nebula with POLARBEAR and its application to the search for axionlike particles. Physical Review D (particles, fields, gravitation, and cosmology) 110(6), article number: 63013. (10.1103/physrevd.110.063013)
- Hertig, E. et al. 2024. The Simons Observatory: Combining cross-spectral foreground cleaning with multitracer B-mode delensing for improved constraints on inflation. Physical Review D (particles, fields, gravitation, and cosmology) 110, article number: 43532. (10.1103/physrevd.110.043532)
2023
- Alonso, D., Fabbian, G., Storey-Fisher, K., Eilers, A., García-García, C., Hogg, D. W. and Rix, H. 2023. Constraining cosmology with the Gaia - unWISE Quasar Catalog and CMB lensing: structure growth. Journal of Cosmology and Astroparticle Physics 2023(11), article number: 43. (10.1088/1475-7516/2023/11/043)
- 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)
- Clancy, J. et al. 2023. Polarization fraction of Planck Galactic cold clumps and forecasts for the Simons Observatory. Monthly Notices of the Royal Astronomical Society 524(3), pp. 3712–3723. (10.1093/mnras/stad2099)
- Adachi, S. et al. 2023. Constraints on axionlike polarization oscillations in the cosmic microwave background with POLARBEAR. Physical Review D 108(4), article number: 43017. (10.1103/PhysRevD.108.043017)
- Vielzeuf, P., Calabrese, M., Carbone, C., Fabbian, G. and Baccigalupi, C. 2023. DEMNUni: the imprint of massive neutrinos on the cross-correlation between cosmic voids and CMB lensing. Journal of Cosmology and Astroparticle Physics 2023(8) (10.1088/1475-7516/2023/08/010)
- Ajani, V. et al. 2023. Euclid preparation XXVIII. Forecasts for ten different higher-order weak lensing statistics. Astronomy & Astrophysics 675, article number: A120. (10.1051/0004-6361/202346017)
2022
- Carron, J., Lewis, A. and Fabbian, G. 2022. Planck integrated Sachs-Wolfe-lensing likelihood and the CMB temperature. PHYSICAL REVIEW D (10.1103/PhysRevD.106.103507)
- Bianchini, F. and Fabbian, G. 2022. CMB spectral distortions revisited: A new take on μ distortions and primordial non-Gaussianities from FIRAS data. Physical Review D 106(6), article number: 63527. (10.1103/PhysRevD.106.063527)
- Scaramella, R. et al. 2022. Euclid preparation: I. The Euclid Wide Survey. Astronomy & Astrophysics 662, article number: A112. (10.1051/0004-6361/202141938)
- Lepori, F. et al. 2022. Euclid preparation: XIX. Impact of magnification on photometric galaxy clustering. Astronomy & Astrophysics 662, article number: A93. (10.1051/0004-6361/202142419)
- The Polarbear Collaboration, . et al. 2022. Improved upper limit on degree-scale CMB B-mode polarization power from the 670 square-degree POLARBEAR Survey. Astrophysical Journal 931(2), article number: 101. (10.3847/1538-4357/ac6809)
- Upham, R. E. et al. 2022. Euclid: Covariance of weak lensing pseudo-Cℓ estimates. Astronomy & Astrophysics 660, article number: A114. (10.1051/0004-6361/202142908)
- Hensley, B. S. et al. 2022. The Simons Observatory: galactic science goals and forecasts. Astrophysical Journal 929(2), article number: 166. (10.3847/1538-4357/ac5e36)
- Lovell, C. C., Wilkins, S. M., Thomas, P. A., Schaller, M., Baugh, C. M., Fabbian, G. and Bahé, Y. 2022. A machine learning approach to mapping baryons on to dark matter haloes using the eagle and C-EAGLE simulations. Monthly Notices of the Royal Astronomical Society (10.1093/mnras/stab3221)
- Namikawa, T. et al. 2022. Simons Observatory: Constraining inflationary gravitational waves with multi-tracer B-mode delensing. Physical Review D 105(2), article number: 23511. (10.1103/PhysRevD.105.023511)
2021
- Zhu, N. et al. 2021. The Simons Observatory Large Aperture Telescope Receiver. Astrophysical Journal Supplement 256(1), article number: 23. (10.3847/1538-4365/ac0db7)
- Mirmelstein, M., Fabbian, G., Lewis, A. and Peloton, J. 2021. Instrumental systematics biases in CMB lensing reconstruction: A simulation-based assessment. Physical Review D 103(12), article number: 123540. (10.1103/PhysRevD.103.123540)
- Fabbian, G. and Peloton, J. 2021. Simulating instrumental systematics of cosmic microwave background experiments with s4cmb. Journal of Open Source Software 6(60), article number: 3022. (10.21105/joss.03022)
Articles
- Zhou, A. J., Li, Y., Dodelson, S., Mandelbaum, R., Zhang, Y., Li, X. and Fabbian, G. 2024. A Hamiltonian, post-Born, three-dimensional, on-the-fly ray tracing algorithm for gravitational lensing. Journal of Cosmology and Astroparticle Physics 2024(10), article number: 69. (10.1088/1475-7516/2024/10/069)
- 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)
- Wolz, K. et al. 2024. The Simons Observatory: Pipeline comparison and validation for large-scale B-modes. Astronomy & Astrophysics 686, article number: A16. (10.1051/0004-6361/202346105)
- Piccirilli, G., Fabbian, G., Alonso, D., Storey-Fisher, K., Carron, J., Lewis, A. and García-García, C. 2024. Growth history and quasar bias evolution at z < 3 from Quaia. Journal of Cosmology and Astroparticle Physics 2024(6), article number: 12. (10.1088/1475-7516/2024/06/012)
- Zagatti, G., Bortolami, M., Gruppuso, A., Natoli, P., Pagano, L. and Fabbian, G. 2024. Planck constraints on cosmic birefringence and its cross-correlation with the CMB. Journal of Cosmology and Astroparticle Physics 2024(5), article number: 34. (10.1088/1475-7516/2024/05/034)
- Storey-Fisher, K., Hogg, D. W., Rix, H., Eilers, A., Fabbian, G., Blanton, M. R. and Alonso, D. 2024. Quaia, the Gaia-unWISE quasar catalog: an all-sky spectroscopic quasar sample. Astrophysical Journal 964, article number: 69. (10.3847/1538-4357/ad1328)
- Dachlythra, N. et al. 2024. The Simons Observatory: Beam characterization for the small aperture telescopes. Astrophysical Journal 961(1), article number: 138. (10.3847/1538-4357/ad0969)
- Adachi, S. et al. 2024. Exploration of the polarization angle variability of the Crab Nebula with POLARBEAR and its application to the search for axionlike particles. Physical Review D (particles, fields, gravitation, and cosmology) 110(6), article number: 63013. (10.1103/physrevd.110.063013)
- Hertig, E. et al. 2024. The Simons Observatory: Combining cross-spectral foreground cleaning with multitracer B-mode delensing for improved constraints on inflation. Physical Review D (particles, fields, gravitation, and cosmology) 110, article number: 43532. (10.1103/physrevd.110.043532)
- Alonso, D., Fabbian, G., Storey-Fisher, K., Eilers, A., García-García, C., Hogg, D. W. and Rix, H. 2023. Constraining cosmology with the Gaia - unWISE Quasar Catalog and CMB lensing: structure growth. Journal of Cosmology and Astroparticle Physics 2023(11), article number: 43. (10.1088/1475-7516/2023/11/043)
- 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)
- Clancy, J. et al. 2023. Polarization fraction of Planck Galactic cold clumps and forecasts for the Simons Observatory. Monthly Notices of the Royal Astronomical Society 524(3), pp. 3712–3723. (10.1093/mnras/stad2099)
- Adachi, S. et al. 2023. Constraints on axionlike polarization oscillations in the cosmic microwave background with POLARBEAR. Physical Review D 108(4), article number: 43017. (10.1103/PhysRevD.108.043017)
- Vielzeuf, P., Calabrese, M., Carbone, C., Fabbian, G. and Baccigalupi, C. 2023. DEMNUni: the imprint of massive neutrinos on the cross-correlation between cosmic voids and CMB lensing. Journal of Cosmology and Astroparticle Physics 2023(8) (10.1088/1475-7516/2023/08/010)
- Ajani, V. et al. 2023. Euclid preparation XXVIII. Forecasts for ten different higher-order weak lensing statistics. Astronomy & Astrophysics 675, article number: A120. (10.1051/0004-6361/202346017)
- Carron, J., Lewis, A. and Fabbian, G. 2022. Planck integrated Sachs-Wolfe-lensing likelihood and the CMB temperature. PHYSICAL REVIEW D (10.1103/PhysRevD.106.103507)
- Bianchini, F. and Fabbian, G. 2022. CMB spectral distortions revisited: A new take on μ distortions and primordial non-Gaussianities from FIRAS data. Physical Review D 106(6), article number: 63527. (10.1103/PhysRevD.106.063527)
- Scaramella, R. et al. 2022. Euclid preparation: I. The Euclid Wide Survey. Astronomy & Astrophysics 662, article number: A112. (10.1051/0004-6361/202141938)
- Lepori, F. et al. 2022. Euclid preparation: XIX. Impact of magnification on photometric galaxy clustering. Astronomy & Astrophysics 662, article number: A93. (10.1051/0004-6361/202142419)
- The Polarbear Collaboration, . et al. 2022. Improved upper limit on degree-scale CMB B-mode polarization power from the 670 square-degree POLARBEAR Survey. Astrophysical Journal 931(2), article number: 101. (10.3847/1538-4357/ac6809)
- Upham, R. E. et al. 2022. Euclid: Covariance of weak lensing pseudo-Cℓ estimates. Astronomy & Astrophysics 660, article number: A114. (10.1051/0004-6361/202142908)
- Hensley, B. S. et al. 2022. The Simons Observatory: galactic science goals and forecasts. Astrophysical Journal 929(2), article number: 166. (10.3847/1538-4357/ac5e36)
- Lovell, C. C., Wilkins, S. M., Thomas, P. A., Schaller, M., Baugh, C. M., Fabbian, G. and Bahé, Y. 2022. A machine learning approach to mapping baryons on to dark matter haloes using the eagle and C-EAGLE simulations. Monthly Notices of the Royal Astronomical Society (10.1093/mnras/stab3221)
- Namikawa, T. et al. 2022. Simons Observatory: Constraining inflationary gravitational waves with multi-tracer B-mode delensing. Physical Review D 105(2), article number: 23511. (10.1103/PhysRevD.105.023511)
- Zhu, N. et al. 2021. The Simons Observatory Large Aperture Telescope Receiver. Astrophysical Journal Supplement 256(1), article number: 23. (10.3847/1538-4365/ac0db7)
- Mirmelstein, M., Fabbian, G., Lewis, A. and Peloton, J. 2021. Instrumental systematics biases in CMB lensing reconstruction: A simulation-based assessment. Physical Review D 103(12), article number: 123540. (10.1103/PhysRevD.103.123540)
- Fabbian, G. and Peloton, J. 2021. Simulating instrumental systematics of cosmic microwave background experiments with s4cmb. Journal of Open Source Software 6(60), article number: 3022. (10.21105/joss.03022)
Conferences
- Braithwaite, C. et al. 2024. A study on the performance of half-wave plates designed for sub-mm studies. Presented at: SPIE Astronomical Telescopes + Instrumentation, Yokohama, Japan, 15-20 June 2024Proc. SPIE 13096: Ground-based and Airborne Instrumentation for Astronomy X. SPIE, (10.1117/12.3019262)
Research
My research lies at the interface between computer science, experimental physics and theoretical cosmology.
I am interested in developing new theoretical understanding of cosmological observables, as well as data analysis and numerical simulation techniques to analyze astrophysical data. To accurately understand our data, we need to learn the properties of our instruments, and I am an expert in connecting instrumental systematic effects with final cosmological measurements.
These days I am particularly interested in synergies between observations of the sky in the microwave band and galaxy surveys in other frequencies. I am keen to combine these two data sets to improve our knowledge of the universe and shed light on neutrino physics, inflation, dark matter and dark energy as well as on a variety of galactic and extragalactic astrophysics (e.g. the physics of galaxy clusters or IGM).
I am a member of multiple CMB experiments. I started my career working on the POLARBEAR experiment, a telescope dedicated to CMB observations that produced the first measurement of its elusive B-mode polarization patter imprinted by the gravitational lensing effect. Since then I became part of the Simons Observatory and CMB-S4 collaboration.
I co-lead the lensing working group of Simons Observatory and in particular the cross-correlation science with galaxy surveys. I am also part of the Euclid consortium where I co-lead its CMB cross-correlation science working group.
Biography
Appointments
- 11/2024-present STFC Ernest Rutherford fellow
- 04/2024-10/2024 Research associate, Kavli Institute for Cosmology Cambridge.
- 2021-2024 Marie Skłodowska Curie Global Fellow, Center for Computational Astrophysics at the Flatiron Institute (New York, USA) and Cardiff University.
- 2018-2020 Research Fellow, University of Sussex.
- 2016–2018 CNES postdoctoral fellow, Institut d’Astrophysique Spatiale (IAS), Orsay, France.
- 2013–2016 Postdoctoral Fellow, International School for Advanced Studies (SISSA), Trieste, Italy.
Visiting positions
- 02/2020 Visiting researcher, CERN Theory division, Geneva, CH.
- 10-11/2015 Visiting Sciama Legacy Fellow, Department of Applied Mathematics and Theoretical Physics (DAMTP), University of Cambridge, Cambridge, UK.
- 01/2011 Visiting graduate student, Computational Cosmology Center, Lawrence Berkeley National Laboratory (LBNL), Berkeley, USA.
Education
- 2010-2013 PhD in Physics, University of Paris VII Denis Diderot, awarded with distinctions. Advisor: Dr. Radek Stompor.
- 2008-2010 Msc in Astrophysics and Space Science, University of Milano-Bicocca, Milan, Italy, Grade 110/110.
- 2009: International Exchange Programme Student, Ecole Polytechnique, Palaiseau, France.
- 2005-2008 Bsc in Physics, University of Milano-Bicocca, Milan, Italy.
Honours and awards
- 2024 STFC Ernest rutherford fellowship
- 2020 Marie Skłodowska Curie Global Fellowship project n. 892401 Precision Cosmology with Galaxy and Microwave Background Surveys (PiCOGAMBAS).
- 2019 STFC Consolidated grant (w/ Prof. A. Lewis).
- 2016 CNES postdoctoral fellowship.
- 2015 Dennis Sciama Legacy Fellowship.
- 2010 ExTRA fellowship of the CARIPLO foundation.
Committees and reviewing
- Reviewing
- Referee Physical Review Letters, Physical Review D, JCAP, Astronomy & Astrophysics, The Astrophysical Journal.
- Grant reviewer for Japan Society for the Promotion of Science (JSPS).
- Phd reviewer for University of Paris 11.
-
Internal reviewer of collaboration papers for CMB-S4, Simons Observatory, POLARBEAR
- Committees
- 2020 Organizer of the CMB lensing workshop (University of Sussex).
- 2019 Organizer of the South Coast Cosmology meeting (University of Sussex )2018 Organizer of the Euclid CMB - cross-correlation SWG meeting
- 2012 Member of the organizing committee of the "Big3: Big bang, Big data, Big computers" conference (Paris, France). Organizer of the Euclid CMB - cross-correlation SWG meeting (Orsay, France, 2018).
Contact Details
Research themes
Specialisms
- Cosmology and extragalactic astronomy
