Pith Number

pith:4S3JL4GU

pith:2025:4S3JL4GU7AZRIJN3R7QTJAYLCN

not attested not anchored not stored refs resolved

The Atacama Cosmology Telescope: DR6 Constraints on Extended Cosmological Models

Adam D. Hincks, Adam He, Adriaan J. Duivenvoorden, Adrien La Posta, Ajay Gill, Aleksandra Kusiak, Alexander van Engelen, Alex Lague, Ali Beheshti, Allen Foster, Amanda MacInnis, Andrina Nicola, Arthur Kosowsky, Benjamin Beringue, Benjamin L. Schmitt, Ben Keller, Bernardita Ried Guachalla, Blake D. Sherwin, Boris Bolliet, Brandon Hensley, Brian J. Koopman, Brittany Fuzia, Bruce Partridge, Carlos Herv\'ias-Caimapo, Carlos Sierra, Carmen Embil Villagra, Carole Tucker, Cody J. Duell, Cristian Vargas, Crist\'obal Sif\'on, Damien C. Ragavan, Darby Kramer, David Alonso, David N. Spergel, Devin Crichton, Diego Maldonado, Edward J. Wollack, Eleonora Barbavara, Elia Stefano Battistelli, Emilie Storer, Emily Biermann, Emmanuel Schaan, Eric R. Switzer, Erika Hornecker, Erin Healy, Erminia Calabrese, Eunseong Lee, Eve M. Vavagiakis, Federico Nati, Felipe Carrero, Felipe Maldonado, Felipe Menanteau, Felipe Rojas, Fiona McCarthy, Frank J. Qu, Gabriela A. Marques, Gene C. Hilton, Gerrit S. Farren, Giovanni Isopi, Grace Chesmore, Graeme E. Addison, Heather Prince, Hidde T. Jense, Hsiao-mei Cho, Hy Trac, Ian Harrison, Irene Abril-Cabezas, Jahmour Givans, James A. Beall, Jason E. Austermann, J. Colin Hill, Jeff McMahon, Jeff Van Lanen, Jo Dunkley, Joel Ullom, Johannes Hubmayr, John Hood, John Orlowski-Scherer, John P. Hughes, Jon Sievers, Joseph E. Golec, Joshiwa van Marrewijk, Joshua Kim, J Richard Bond, Kaiwen Zheng, Karen Perez Sarmiento, Kasey Wagoner, Kavilan Moodley, Keir K. Rogers, Kenda Knowles, Kent Irwin, Kevin Coughlin, Kevin M. Huffenberger, Kevin T. Crowley, Kristen Surrao, Laura Newburgh, Leander Thiele, Leila R. Vale, Luca Pagano, Lukas Wenzl, Lyman A. Page, Mandana Amiri, Margaret Ikape, Marius Lungu, Mark Halpern, Mark J. Devlin, Martina Gerbino, Martine Lokken, Massimiliano Lattanzi, Mathew S. Madhavacheril, Matthew Hasselfield, Matt Hilton, Max Fankhanel, Maya Mallaby-Kay, Michael D. Niemack, Michael R. Nolta, Michele Limon, Neelima Sehgal, Neha Joshi, Niall MacCrann, Nicholas Battaglia, Nicholas F. Cothard, Nicola Barbieri, Niklas Tampier, Omar Darwish, Patricio A. Gallardo, Peter A. R. Ade, Rachel Bean, Ren\'ee Hlo\v{z}ek, Rita Sonka, Roberto Puddu, Robert Thornton, Rodrigo Freundt, Rolando Dunner, Rui An, Samuel Goldstein, Sara Simon, Serena Giardiello, Shabbir Shaikh, Shannon M. Duff, Shawn Henderson, Shi-Fan Chen, Shivam Pandey, Shuay-Pwu Patty Ho, Sigurd Naess, Simon Dicker, Simone Aiola, Simone Ferraro, Simran K. Nerval, Steve K. Choi, Susan E. Clark, Suzanne T. Staggs, Tai Sakuma, Tanay Bhandarkar, Thibaut Louis, Thomas W. Morris, Tommy Alford, Tony Mroczkowski, Toshiya Namikawa, Valentina Capalbo, Vera Gluscevic, Victoria Lakey, William Coulton, Xavier Garrido, Yaqiong Li, Yilun Guan, Yogesh Mehta, Yuhan Wang, Yulin Gong, Zachary Atkins, Zachary B. Huber, Zack Li

ACT DR6 data finds no statistically significant preference for extensions to the Lambda CDM model.

arxiv:2503.14454 v2 · 2025-03-18 · astro-ph.CO · gr-qc · hep-ph

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Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

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The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

We find no statistically significant preference for a departure from the baseline Lambda CDM model. In general, models introduced to increase the Hubble constant or to decrease the amplitude of density fluctuations inferred from the primary CMB are not favored by our data.

C2weakest assumption

The analysis assumes that the chosen parametrizations of extensions correctly capture the relevant physics and that combining ACT, Planck, DESI, and Pantheon+ data does not introduce unmodeled systematics that could mask or mimic signals.

C3one line summary

ACT DR6 CMB data shows no significant evidence for extensions beyond Lambda CDM, with neutrino effective species at 2.86 plus or minus 0.13 and sum of neutrino masses below 0.082 eV at 95 percent CL.

References

18 extracted · 18 resolved · 1 Pith anchors

[1] Abazajianet al., CMB-S4 Science Case, Reference Design, and Project Plan, (2019), arXiv:1907.04473 [astro-ph.IM] 2019 · doi:10.1103/physrevlett.48.1220

[2] We obtain the baseline settings summarized in §3 and reported in Figs 2024

[3] Since CosmoRec is not available with class, we use HyRec for models using this code 2020

[4] Note that halofit version=mead2020 and BBN consistency from PRIMAT 2021 are already default settings in this camb version 2021

[5] In this work, we use a version of the code that has been updated to implement the latest HMcode-2020 model for the non-linear power spectrum, provided by J 2020

Formal links

2 machine-checked theorem links

Cited by

49 papers in Pith

Inflationary models in a minimally coupled $f(R,T)$ gravity: Constraints from $Planck$, BICEP/$Keck$, and ACT

Natural Metric-Affine Inflation: Reloaded

DEMNUni: the Sunyaev-Zel'dovich effect in the presence of massive neutrinos and dynamical dark energy

ACT-ing on inflation: Implications of non Bunch-Davies initial condition and reheating on single-field slow roll models

Dark Energy in Ghost-free non-local Gravity

Receipt and verification

First computed	2026-05-17T23:38:52.426187Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e4b695f0d4f8331425bb8fe134830b13423566380369df67f4793bc4fe022303

Aliases

arxiv: 2503.14454 · arxiv_version: 2503.14454v2 · doi: 10.48550/arxiv.2503.14454 · pith_short_12: 4S3JL4GU7AZR · pith_short_16: 4S3JL4GU7AZRIJN3 · pith_short_8: 4S3JL4GU

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/4S3JL4GU7AZRIJN3R7QTJAYLCN \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: e4b695f0d4f8331425bb8fe134830b13423566380369df67f4793bc4fe022303

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "fae9b5fbf1d8470ed281b33c74e2c705034a27166e3c8f0f7b0fdeac5ffae7bc",
    "cross_cats_sorted": [
      "gr-qc",
      "hep-ph"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2025-03-18T17:30:26Z",
    "title_canon_sha256": "30f39a69c676b9ba41ba5e126b2e66b4a5e646d5b08aa87558a06ea0821df9e8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2503.14454",
    "kind": "arxiv",
    "version": 2
  }
}