SnowMass2021

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====== COSMIC FRONTIER ======

 <color #ed1c24>**Draft Frontier Report (October 4, 2022 version):**
</color>  

{{ :cosmic:cf_report_10-4-22.pdf |}}

 <color #ed1c24>**Form For Comments:**
</color>  

[[https://docs.google.com/forms/d/e/1FAIpQLSdu7KyGBAn9m3UYvDh4Z0XwhKfO4H5Ric2DHXF_39MeFXEU7g/viewform|Form for comments]]
===== Conveners =====
^Name ^Institution ^Email |
|Aaron Chou|Fermi National Accelerator Laboratory|achou[at]fnal.gov|
|Marcelle Soares-Santos|University of Michigan|mssantos[at]umich.edu|
|Tim M.P. Tait|University of California, Irvine|ttait[at]uci.edu|

===== Description =====

The Cosmic frontier includes probes of the fundamental nature of dark matter and dark energy, and opportunities using astrophysical and cosmological data to learn about fundamental physics.

<color #ed1c24>**CF1. Dark Matter: Particle-like**</color>

  * [[https://arxiv.org/abs/2209.07426 | CF1 Topical Group Report]]
    * [[https://www.overleaf.com/read/fjvszqjyrnpy | CF1 Topical Group Report Overleaf]]
    * [[https://docs.google.com/spreadsheets/d/1LqMxYBoAAVbgLafNzWJ1J2PJAuvJGLsdHtz2ZyN6mv8/edit?usp=sharing|Report Feedback Form]]

  * {{ :cosmic:cssv2_cf1.pdf | CSS Parallel Slides CF1 (Jul. 18)}}
    * [[https://docs.google.com/document/d/1vUvUJrO4oEgAvRC8BP50sIwgrh1M_W5ZTdiAPnDb_LY/edit?usp=sharing|Live Minutes]]
  * [[https://indico.fnal.gov/event/22303/sessions/20651/#20220719| CSS Parallel DM Comp. CF1/2/3/7 (Jul. 19)]]
  * {{ :cosmic:repdiscv1_cf1.pdf | CSS Report Discussion Slides CF1 (Jul. 20)}}

This group covers dark matter in the regime where it appears in experiments as individual quanta, rather than coherently via wave phenomena. Techniques to search for such particles include directly through its interaction with detector materials, indirectly from products of its annihilation, and via production at accelerators (primarily covered in other frontiers).

<color #ed1c24>**CF2. Dark Matter: Wave-like**</color>

  * [[https://arxiv.org/abs/2209.08125 | CF2 Topical Group Report]]
     * [[https://docs.google.com/document/d/1I2-V8RcvhONOEMdNaYd2jrnYWeg8mSmkuNcalapeX4A/edit?usp=sharing|Report Feedback Doc.]]

  * {{ :cosmic:cssv1_cf2.pdf| CSS Parallel Slides CF2 (Jul. 18)}}
  * [[https://indico.fnal.gov/event/22303/sessions/20651/#20220719| CSS Parallel DM Comp. CF1/2/3/7 (Jul. 19)]]
  * {{ :cosmic:repdiscv1_cf2.pdf | CSS Report Discussion Slides CF2 (Jul. 20)}}

This group covers low mass bosonic dark matter in the regime where it appears in experiments coherently via wave phenomena rather than as individual quanta. Examples include the QCD axion and more general axions, dark photons, and scalar dark matter. Current experimental techniques include broadband and resonant searches via cavities, circuit oscillators, NMR, utilizing low noise readout with quantum sensing and amplification technologies.

<color #ed1c24>**CF3. Dark Matter: Cosmic Probes**</color>

  * [[https://arxiv.org/abs/2209.08215 | CF3 Topical Group Report]]
     * [[https://docs.google.com/document/d/1mnQLDA8_zgW4zXSJd4RlpbVxWX-kSaLscZj-nLnSmfQ|Report Feedback Doc.]]

  * {{ :cosmic:cssv1_cf3.pdf| CSS Parallel Slides CF3 (Jul. 18)}}
  * [[https://indico.fnal.gov/event/22303/sessions/20651/#20220719| CSS Parallel DM Comp. CF1/2/3/7 (Jul. 19)]]
  * {{ :cosmic:repdiscv1_cf3.pdf | CSS Report Discussion Slides CF3 (Jul. 20)}}

This group covers properties of dark matter that can be uniquely probed by cosmological and astrophysical observations. Techniques include measurements of the cosmological distribution of dark matter, as well as studies of astrophysical objects in extreme environments. Examples of dark matter models probed through these techniques are warm dark matter, self-interacting dark matter, ultra-light axions, and primordial black holes.

<color #ed1c24>**CF4. Dark Energy and Cosmic Acceleration: The Modern Universe**</color>

  * [[https://arxiv.org/abs/2209.08049 | CF4 Topical Group Report]]
     * [[https://docs.google.com/document/d/1--wu9yRm030XE8jupiGUN9W9pZpQt9fTpeNI1bpzXio/edit?usp=sharing|Report Feedback Doc.]]

  * {{ :cosmic:cssv1_cf4.pdf| CSS Parallel Slides CF4 (Jul. 18)}}
    * [[https://docs.google.com/document/d/156rSmh-5q7qfhvorB1FdV_CCMnsCid2BiReLWgOUX5E/edit#|Live Minutes]]
  * {{ :cosmic:repdiscv1_cf4.pdf | CSS Report Discussion Slides CF4 (Jul. 20)}}

This group covers cosmic probes of cosmology in the Modern Universe, when galaxies are fully formed. These probes include galaxy clusters, galaxy clustering, redshift space distortions, gravitational lensing, baryonic acoustic oscillations, supernovae and more. Spectroscopic, broad-band and multi-wavelength surveys are examples of experiments that will be primarily discussed in this working group. Other examples include projects involving CMB, 21cm, and gravitational wave observations.

<color #ed1c24>**CF5. Dark Energy and Cosmic Acceleration: Cosmic Dawn and Before**</color>

  * [[https://arxiv.org/abs/2209.08265 | CF5 Topical Group Report]]
     * {{ :cosmic:repv1_cf5.pdf | CF5 Topical Group Report (a/o Jul. 19)}}
     * [[https://docs.google.com/spreadsheets/d/15WlyheSWOP-VIiwVtLanjy42xGfn0QnaRn3Ff4YGIis/edit#gid=0|Report Feedback Form]]

  * {{ :cosmic:cssv1_cf5.pdf| CSS Parallel Slides CF5 (Jul. 19)}} 
  * {{ :cosmic:repdiscv1_cf5.pdf | CSS Report Discussion Slides CF5 (Jul. 20)}}

This group covers cosmic probes of cosmology in the early Universe from Inflation Era through the Cosmic Dawn. Subtopics include: growth of structure probes (e.g. 21cm power spectrum in the dark ages), probes of expansion history (e.g. BAO with black hole mergers, CMB), primordial non-gaussianity and inflation. High-z gravitational wave observatories, 21cm and CMB projects are examples of experiments expected to be primarily discussed here. Overlaps with the previous section are expected.

<color #ed1c24>**CF6. Dark Energy and Cosmic Acceleration: Complementarity of Probes and New Facilities**</color>

  * [[https://arxiv.org/abs/2209.08654 | CF6 Topical Group Report]]
     * [[https://docs.google.com/document/d/1f2m7oOfqjL4EgT-eQheGDHtT-H47AMlGX9QxVz6bE9I/edit |Report Feedback Doc.]]

  * {{ :cosmic:cssv1_cf6.pdf| CSS Parallel Slides CF6 (Jul. 19)}} 
  * {{ :cosmic:repdiscv1_cf6.pdf | CSS Report Discussion Slides CF6 (Jul. 20)}}

This group covers the connections between probes across multiple axes including combined probes across the early/late time regimes, and plans for future observatories/facilities to maximize the science outputs for Dark Energy and Cosmic Acceleration physics. Discussions about multimessenger projects (including GW, and Neutrinos) and new physics opportunities not included in the early/late universe topics are also welcome here.

<color #ed1c24>**CF7. Cosmic Probes of Fundamental Physics**</color>

  * [[https://arxiv.org/abs/2209.11726 | CF7 Topical Group Report]]
     * {{ :cosmic:repv1_cf7.pdf | CF7 Topical Group Report (a/o Jul. 19)}}
     * [[https://forms.gle/kKuWWPgRaohQ8YqN7|Report Feedback Form]]

  * {{ :cosmic:cssv2_cf7.pdf| CSS Parallel Slides CF7 (Jul. 19)}} 
      * [[https://docs.google.com/document/d/1hK2-Z2qeV63BJUDsEyo4GmlRinrPYIN32tTmGir5zH0/edit?usp=sharing|Live Minutes]]
  * [[https://indico.fnal.gov/event/22303/sessions/20651/#20220719| CSS Parallel DM Comp. CF1/2/3/7 (Jul. 19)]]
  * {{ :cosmic:repdiscv3_cf7.pdf | CSS Report Discussion Slides CF7 (Jul. 20)}}

CF7 covers cosmic probes of fundamental physics topics beyond Dark Matter and Dark Energy using gravitational waves, cosmic rays, gamma rays, and neutrinos, as well as their combined studies to facilitate the multi-messenger science. This includes measurements of neutrino properties from cosmology (overlap with NF 5), tests of general relativity, emergent spacetime (overlap with CF2, 3, 5), black hole information with gravitational waves, the tension between local distance ladder measurements and cosmic microwave background estimates of the Hubble constant, equation of state of dense nuclear matter and hadron-quark gluon phase transitions, particle acceleration in astrophysical environments, bread-and-butter perturbative QCD and hadronic physics of extensive air showers, Lorentz Invariance Violation, search for evaporating primordial black holes, and exotic particles such as SUSY q-balls and axions.

===== Topical Group Pages =====

<catlist cosmic: -noAddPageButton -noHead -sortAscending -sortByTitle>

===== Submissions =====

  * **Letters of Interest** are due by August 31, 2020 and can be submitted by following the instructions [[https://snowmass21.org/loi|here]]. We ask you to use the Cosmic Frontier template provided below:
    * [[https://www.overleaf.com/read/wqctrdrxpkkp
|Cosmic Frontier LOI LaTeX Template on Overleaf]]
    * [[https://docs.google.com/document/d/1OWPYCE16v0g6_HwxxwR6gucVenmwUzVkZAN0BiJmQTI|Cosmic Frontier LOI Google Doc Template]]


  * **Contributed Papers** are due March 15, 2022. Instructions can be found [[https://snowmass21.org/submissions/start|here]]. Contributed papers are not required to use  any official template, but we provide one for convenience.
    * [[https://docs.google.com/document/d/1hKnvyakgLFGfVO4PPQYoZF_MWrRvWOfW5zudUeDVIu4/edit?usp=sharing| CF Coordinated White Paper Planning Document]]
    * [[https://www.overleaf.com/read/xdbrdhtxvthy
|Cosmic Frontier Contributed Paper Template on Overleaf]]

===== Communications  =====

 
  *  **Topical Group e-mail lists**, please subscribe to the one or more of your choice (see instructions below):
    * <SNOWMASS-CF-01-DM-PARTICLE@FNAL.GOV>
    * <SNOWMASS-CF-02-DM-WAVE@FNAL.GOV>
    * <SNOWMASS-CF-03-DM-COSMIC@FNAL.GOV>
    * <SNOWMASS-CF-04-DE-CA-MODERN-UNIV@FNAL.GOV>
    * <SNOWMASS-CF-05-DE-CA-COSMIC-DAWN@FNAL.GOV>
    * <SNOWMASS-CF-06-DE-COMPL-FAC@FNAL.GOV>
    * <SNOWMASS-CF-07-COSMIC-PROBES-FUN@FNAL.GOV>
  * **How to join an CF email list** out of those listed above:
    - Send an e-mail message to listserv@fnal.gov with
    - Subject line blank, and 
    - Type the following text in the body of your message: “SUBSCRIBE SNOWMASS-COSMIC-FRONTIER-GROUP FIRSTNAME LASTNAME” without the quotation marks, and replacing SNOWMASS-COSMIC-FRONTIER-GROUP with the corresponding string from the mailing-lists above, e.g.  SNOWMASS-CF-01-DM-PARTICLE. If you need help, email achou[AT]fnal.gov . 
  * **Slack Channels**, please subscribe to those of your choice (see instructions below)
    * //Slack channels for topics common to the entire Cosmic Frontier//: 
    * [[https://app.slack.com/client/TNNU4A570/CNE9Z10QH| cosmic_frontier_topics]] 
     * //Slack channels for topics specifics to the individual CF Topic Groups//:
       * [[https://app.slack.com/client/TNNU4A570/C0136B7F8MN| cf01-dark_matter_particle]]
       * [[https://app.slack.com/client/TNNU4A570/C012V51M7SM| cf02-dark_matter_wave]]
       * [[https://app.slack.com/client/TNNU4A570/C0129Q0E0RL| cf03-dark_matter_cosmic]]
       * [[https://app.slack.com/client/TNNU4A570/C012NM71L20| cf04-dark_energy_modern]]
       * [[https://app.slack.com/client/TNNU4A570/C0121Q60TN3| cf05-dark_energy_dawn]]
       * [[https://app.slack.com/client/TNNU4A570/C012GNLN411| cf06-dark_energy_comp]]
       * [[https://app.slack.com/client/TNNU4A570/C012GGH7RMG| cf07-cosmic_probes]]
      
    * To join the slack discussion, please see instructions at the bottom of the page https://snowmass21.org/start .  If you sign up for the general Snowmass email list then you will be signed up for  the slack channel as well.
 


===== Meetings  =====
  * [[https://indico.fnal.gov/event/54648/|Hot Topics on the Cosmic Frontier -- Short colloquia on Fridays in June, 2022]] 
  * Meetings are via Indico.   Go to [[https://indico.fnal.gov/category/1103/|Indico link for our Frontier]] to find agendas.
  * A compendium of Cosmic Frontier meetings and materials can be found [[https://docs.google.com/document/d/1VT57RFTEA6gAnWBIKiERrAZaqtjsaJfF9JkQ4A9nWIQ/edit?usp=sharing|here]].
  * **CosmicFrontier Meeting Calendar**:
 {{url>https://calendar.google.com/calendar/embed?src=snowmasscf2021%40gmail.com  100%,750px}}
  
===== Submitted LOI =====
Letters of Intent submitted to Cosmic Frontier (as primary frontier) [[https://www.snowmass21.org/docs/files/?dir=summaries/CF| shown in this link]]. Here is the list of submitted LOIs that include CF as primary or secondary topic. 
 First index before "/"  corresponds to the primary frontier used for the submission.
Please go to the "topical" group to see the LOIs submitted to specific topics.  Documents with "CF0" will be shown only here (no specific topic).


<hidden click here to view LoI submitted to this frontier>
{{url>https://www.snowmass21.org/docs/files/list.php?frontier=CF  border 100%,12000px}}
</hidden>