Professional Education


  • Ph.D., University of California, Berkeley, Physics (2025)
  • B.A., Cornell University, Physics and Mathematics (2019)

Stanford Advisors


All Publications


  • Highly Efficient Selection of High-redshift Emission-line Galaxies for Future DESI-like Surveys with Deep Multiband Imaging ASTRONOMICAL JOURNAL Hernandez, Y., Newman, J. A., Andrews, B. H., Dey, B., Zhou, R., Sailer, N., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Canning, R., Castander, F. J., Chaussidon, E., Claybaugh, T., Cuceu, A., de la Macorra, A., Dey, A., Doel, P., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gaztanaga, E., Gontcho A Gontcho, S., Gutierrez, G., Herrera-Alcantar, H. K., Joyce, R., Juneau, S., Kehoe, R., Kirkby, D., Kisner, T., Kremin, A., Lahav, O., Lamman, C., Landriau, M., Levi, M. E., Manera, M., Meisner, A., Miquel, R., Moustakas, J., Nadathur, S., Palanque-Delabrouille, N., Percival, W. J., Prada, F., Perez-Rafols, I., Raichoor, A., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Seo, H., Silber, J., Sprayberry, D., Tarle, G., Weaver, B. A., Yeche, C., Zou, H. 2026; 172 (1)
  • Addressing Tensions in LambdaCDM Cosmology by an Increase in the Optical Depth to Reionization. Physical review letters Sailer, N., Farren, G. S., Ferraro, S., White, M. 2026; 136 (8): 081002

    Abstract

    Recent baryonic acoustic oscillation (BAO) measurements from the Dark Energy Spectroscopic Instrument (DESI) are mildly discrepant (2.2sigma) with the cosmic microwave background (CMB) when interpreted within LambdaCDM. When analyzing these data with extended cosmologies this inconsistency manifests as a ≃3sigma preference for subminimal neutrino mass or evolving dark energy. It is known that the preference for subminimal neutrino mass from the suppression of structure growth could be alleviated by increasing the optical depth to reionization tau. We show that, because the CMB-inferred tau is negatively correlated with the matter fraction, a larger optical depth resolves a similar preference from geometric constraints. Optical depths large enough to resolve the neutrino mass tension (tau0.09) reduce the preference for evolving dark energy from ≃3sigma to ≃1.5sigma and increase the CMB-inferred values of n_{s} and H_{0} to 0.968±0.004 and 67.94±0.44km/s/Mpc, respectively. Conversely, within LambdaCDM the combination of DESI BAO, high-ℓ CMB, and CMB lensing yields tau=0.090±0.012, which is in ≃3-5sigma tension with Planck low-ℓ polarization data when taken at face value. Essentially all current CMB analyses-including recent results from WMAP + ACT and SPT-adopt the Planck measurement of tau; thus a systematic in large-scale Planck polarization would serve as a "single-point failure" for most modern cosmological analyses that include CMB data. While there is no evidence for systematics in the large-scale Planck data, tau remains the least well-constrained LambdaCDM parameter and is far from its cosmic variance limit. This strengthens the case for future large-scale CMB experiments as well as direct probes of the epoch of reionization.

    View details for DOI 10.1103/6r54-8lv4

    View details for PubMedID 41824988

  • Missing baryons recovered: A measurement of the gas fraction in galaxies and groups with the kinematic Sunyaev-Zel'dovich effect and CMB lensing PHYSICAL REVIEW D Hadzhiyska, B., Ferraro, S., Farren, G. S., Sailer, N., Zhou, R. 2025; 112 (12)

    View details for DOI 10.1103/mdhz-fgj8

    View details for Web of Science ID 001634507300014

  • Mapping the gas density with the kinematic Sunyaev-Zel'dovich and patchy screening effects: A self-consistent comparison PHYSICAL REVIEW D Hadzhiyska, B., Sailer, N., Ferraro, S. 2025; 112 (10)

    View details for DOI 10.1103/xjst-ffw2

    View details for Web of Science ID 001629222800005

  • Bias-hardened estimators of patchy screening profiles PHYSICAL REVIEW D Sailer, N., Hadzhiyska, B., Ferraro, S. 2025; 112 (8)

    View details for DOI 10.1103/hw1x-n17q

    View details for Web of Science ID 001613853400007

  • Cosmology from Planck CMB lensing and DESI DR1 quasar tomography JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS de Belsunce, R., Krolewski, A., Chaussidon, E., Ferraro, S., Farren, G., Hadzhiyska, B., Tamone, A., Chiarenza, S., Sailer, N., Ravoux, C., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Claybaugh, T., Cuceu, A., de la Macorra, A., Della Costa, J., Dey, B., Doe, P., Era, A., Forero-Romero, J. E., Gaztanaga, E., Gontcho, S., Gutierrez, G., Guy, J., Herrera-Alcantar, H. K., Honscheid, K., Ishak, M., Joyce, R., Juneau, S., Kehoe, R., Kirkby, D., Kisner, T., Kremin, A., Lahav, O., Lambert, A., Lamman, C., Landriau, M., Le Guillou, L., Levi, M. E., Manera, M., Martini, P., Meisner, A., Miquel, R., Nadathur, S., Niz, G., Palanque-Delabrouille, N., Percival, W. J., Prada, F., Perez-Rafols, I., Ross, A. J., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Seo, H., Silber, J., Sprayberry, D., Tarle, G., Weaver, B. A., Zhou, R., Zou, H. 2025
  • Cosmological constraints from the cross-correlation of DESI Luminous Red Galaxies with CMB lensing from Planck PR4 and ACT DR6 JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS Sailer, N., Kim, J., Ferraro, S., Madhavacheril, M. S., White, M., Abril-Cabezas, I., Aguilar, J., Ahlen, S., Bond, J., Brooks, D., Burtin, E., Calabrese, E., Chen, S., Choi, S. K., Claybaugh, T., Dawson, K., de la Macorra, A., Derose, J., Dey, A., Dey, B., Doel, P., Dunkley, J., Embil-Villagra, C., Farren, G. S., Era, A., Forero-Romero, J. E., Gaztanaga, E., Gluscevic, V., Gontcho, S., Honscheid, K., Howlett, C., Juneau, S., Kirkby, D., Kisner, T., Kremin, A., Landriau, M., Le Guillou, L., Levi, M., Manera, M., Meisner, A., Miquel, R., Moodley, K., Moustakas, J., Niemack, M. D., Niz, G., Palanque-Delabrouille, N., Percival, W., Prada, F., Qu, F. J., Rossi, G., Sanchez, E., Schaan, E., Schlafly, E., Schlegel, D., Schubnell, M., Sehgal, N., Seo, H., Sherwin, B., Sifon, C., Sprayberry, D., Staggs, S. T., Tarle, G., Weaver, B., Yeche, C., Zhou, R., Zou, H. 2025
  • Evolution of structure growth during dark energy domination: Insights from the cross-correlation of DESI galaxies with CMB lensing and galaxy magnification PHYSICAL REVIEW D Sailer, N., DeRose, J., Ferraro, S., Chen, S., Zhou, R., White, M., Kim, J., Madhavacheril, M. 2025; 111 (10)

    View details for DOI 10.1103/27rg-tq8z

    View details for Web of Science ID 001512922300015

  • The Atacama Cosmology Telescope DR6 and DESI: structure formation over cosmic time with a measurement of the cross-correlation of CMB lensing and luminous red galaxies JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS Kim, J., Sailer, N., Madhavacheril, M. S., Ferraro, S., Abril-Cabezas, I., Aguilar, J., Ahlen, S., Bond, J., Brooks, D., Burtin, E., Calabrese, E., Chen, S., Choi, S. K., Claybaugh, T., Darwish, O., de la Macorra, A., DeRose, J., Devlin, M., Dey, A., Doel, P., Dunkley, J., Embil-Villagra, C., Farren, G. S., Font-Ribera, A., Forero-Romero, J. E., Gaztanaga, E., Gluscevic, V., Gontcho, S., Gontcho, A., Guy, J., Honscheid, K., Howlett, C., Kirkby, D., Kisner, T., Kremin, A., Landriau, M., Le Guillou, L., Levi, M. E., MacCrann, N., Manera, M., Marques, G. A., Meisner, A., Miquel, R., Moodley, K., Moustakas, J., Newburgh, L. B., Newman, J. A., Niz, G., Orlowski-Scherer, J., Palanque-Delabrouille, N., Percival, W. J., Prada, F., Qu, F. J., Rossi, G., Sanchez, E., Schaan, E., Schlafly, E. F., Schlegel, D., Schubnell, M., Sehgal, N., Seo, H., Shaikh, S., Sherwin, B. D., Sifon, C., Sprayberry, D., Staggs, S. T., Tarle, G., van Engelen, A., Weaver, B., Wenzl, L., White, M., Wollack, E. J., Yeche, C., Zou, H. 2024
  • Predicting the 21-cm field with a hybrid effective field theory approach PHYSICAL REVIEW D Baradaran, D., Hadzhiyska, B., White, M., Sailer, N. 2024; 110 (10)
  • DESI luminous red galaxy samples for cross-correlations JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS Zhou, R., Ferraro, S., White, M., Derose, J., Sailer, N., Aguilar, J., Ahlen, S., Bailey, S., Brooks, D., Claybaugh, T., Dawson, K., de la Macorra, A., Dey, B., Doel, P., Font-Ribera, A., Forero-Romero, J. E., Gontcho, S., Guy, J., Kremin, A., Lambert, A., Le Guillou, L., Levi, M., Magneville, C., Manera, M., Meisner, A., Miquel, R., Moustakas, J., Myers, A. D., Newman, J. A., Nie, J., Percival, W., Rezaie, M., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Seo, H., Tarle, G., Zhou, Z. 2023
  • Optimizing foreground mitigation for CMB lensing with combined multifrequency and geometric methods PHYSICAL REVIEW D Darwish, O., Sherwin, B. D., Sailer, N., Schaan, E., Ferraro, S. 2023; 107 (4)
  • Foreground-immune CMB lensing reconstruction with polarization PHYSICAL REVIEW D Sailer, N., Ferraro, S., Schaan, E. 2023; 107 (2)
  • Optical depth to reionization from perturbative 21 cm clustering JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS Sailer, N., Chen, S., White, M. 2022
  • Optimal multifrequency weighting for CMB lensing PHYSICAL REVIEW D Sailer, N., Schaan, E., Ferraro, S., Darwish, O., Sherwin, B. 2021; 104 (12)
  • Cosmology at high redshift - a probe of fundamental physics JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS Sailer, N., Castorina, E., Ferraro, S., White, M. 2021
  • Lower bias, lower noise CMB lensing with foreground-hardened estimators PHYSICAL REVIEW D Sailer, N., Schaan, E., Ferraro, S. 2020; 102 (6)