TY  - JOUR
AU  - Afzal, Adeela
AU  - Agazie, Gabriella
AU  - Anumarlapudi, Akash
AU  - Archibald, Anne M.
AU  - Arzoumanian, Zaven
AU  - Baker, Paul T.
AU  - Bécsy, Bence
AU  - Blanco-Pillado, Jose Juan
AU  - Blecha, Laura
AU  - Boddy, Kimberly K.
AU  - Brazier, Adam
AU  - Brook, Paul R.
AU  - Burke-Spolaor, Sarah
AU  - Burnette, Rand
AU  - Case, Robin
AU  - Charisi, Maria
AU  - Chatterjee, Shami
AU  - Chatziioannou, Katerina
AU  - Cheeseboro, Belinda D.
AU  - Chen, Siyuan
AU  - Cohen, Tyler
AU  - Cordes, James M.
AU  - Cornish, Neil J.
AU  - Crawford, Fronefield
AU  - Cromartie, H. Thankful
AU  - Crowter, Kathryn
AU  - Cutler, Curt J.
AU  - DeCesar, Megan E.
AU  - DeGan, Dallas
AU  - Demorest, Paul B.
AU  - Deng, Heling
AU  - Dolch, Timothy
AU  - Drachler, Brendan
AU  - von Eckardstein, Richard
AU  - Ferrara, Elizabeth C.
AU  - Fiore, William
AU  - Fonseca, Emmanuel
AU  - Freedman, Gabriel E.
AU  - Garver-Daniels, Nate
AU  - Gentile, Peter A.
AU  - Gersbach, Kyle A.
AU  - Glaser, Joseph
AU  - Good, Deborah C.
AU  - Guertin, Lydia
AU  - Gültekin, Kayhan
AU  - Hazboun, Jeffrey S.
AU  - Hourihane, Sophie
AU  - Islo, Kristina
AU  - Jennings, Ross J.
AU  - Johnson, Aaron D.
AU  - Jones, Megan L.
AU  - Kaiser, Andrew R.
AU  - Kaplan, David L.
AU  - Kelley, Luke Zoltan
AU  - Kerr, Matthew
AU  - Key, Joey S.
AU  - Laal, Nima
AU  - Lam, Michael T.
AU  - Lamb, William G.
AU  - Lazio, T. Joseph W.
AU  - Lee, Vincent S. H.
AU  - Lewandowska, Natalia
AU  - Lino dos Santos, Rafael R.
AU  - Littenberg, Tyson B.
AU  - Liu, Tingting
AU  - Lorimer, Duncan R.
AU  - Luo, Jing
AU  - Lynch, Ryan S.
AU  - Ma, Chung-Pei
AU  - Madison, Dustin R.
AU  - McEwen, Alexander
AU  - McKee, James W.
AU  - McLaughlin, Maura A.
AU  - McMann, Natasha
AU  - Meyers, Bradley W.
AU  - Meyers, Patrick M.
AU  - Mingarelli, Chiara M. F.
AU  - Mitridate, Andrea
AU  - Nay, Jonathan
AU  - Natarajan, Priyamvada
AU  - Ng, Cherry
AU  - Nice, David J.
AU  - Ocker, Stella Koch
AU  - Olum, Ken D.
AU  - Pennucci, Timothy T.
AU  - Perera, Benetge B. P.
AU  - Petrov, Polina
AU  - Pol, Nihan S.
AU  - Radovan, Henri A.
AU  - Ransom, Scott M.
AU  - Ray, Paul S.
AU  - Romano, Joseph D.
AU  - Sardesai, Shashwat C.
AU  - Schmiedekamp, Ann
AU  - Schmiedekamp, Carl
AU  - Schmitz, Kai
AU  - Schröder, Tobias
AU  - Schult, Levi
AU  - Shapiro-Albert, Brent J.
AU  - Siemens, Xavier
AU  - Simon, Joseph
AU  - Siwek, Magdalena S.
AU  - Stairs, Ingrid H.
AU  - Stinebring, Daniel R.
AU  - Stovall, Kevin
AU  - Stratmann, Peter
AU  - Sun, Jerry P.
AU  - Susobhanan, Abhimanyu
AU  - Swiggum, Joseph K.
AU  - Taylor, Jacob
AU  - Taylor, Stephen R.
AU  - Trickle, Tanner
AU  - Turner, Jacob E.
AU  - Unal, Caner
AU  - Vallisneri, Michele
AU  - Verma, Sonali
AU  - Vigeland, Sarah J.
AU  - Wahl, Haley M.
AU  - Wang, Qiaohong
AU  - Witt, Caitlin A.
AU  - Wright, David
AU  - Young, Olivia
AU  - Zurek, Kathryn M.
TI  - The NANOGrav 15-year Data Set: Search for Signals from New Physics
JO  - The astrophysical journal / 2
VL  - 951
IS  - 1
SN  - 2041-8205
CY  - London
PB  - Institute of Physics Publ.
M1  - PUBDB-2023-04004
M1  - arXiv:2306.16219
SP  - L11
PY  - 2023
N1  - 74 pages, 31 figures, 4 tables; published in Astrophysical Journal Letters as part of Focus on NANOGrav's 15-year Data Set and the Gravitational Wave Background. For questions or comments, please email comments@nanograv.org
AB  - The 15 yr pulsar timing data set collected by the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) shows positive evidence for the presence of a low-frequency gravitational-wave (GW) background. In this paper, we investigate potential cosmological interpretations of this signal, specifically cosmic inflation, scalar-induced GWs, first-order phase transitions, cosmic strings, and domain walls. We find that, with the exception of stable cosmic strings of field theory origin, all these models can reproduce the observed signal. When compared to the standard interpretation in terms of inspiraling supermassive black hole binaries (SMBHBs), many cosmological models seem to provide a better fit resulting in Bayes factors in the range from 10 to 100. However, these results strongly depend on modeling assumptions about the cosmic SMBHB population and, at this stage, should not be regarded as evidence for new physics. Furthermore, we identify excluded parameter regions where the predicted GW signal from cosmological sources significantly exceeds the NANOGrav signal. These parameter constraints are independent of the origin of the NANOGrav signal and illustrate how pulsar timing data provide a new way to constrain the parameter space of these models. Finally, we search for deterministic signals produced by models of ultralight dark matter (ULDM) and dark matter substructures in the Milky Way. We find no evidence for either of these signals and thus report updated constraints on these models. In the case of ULDM, these constraints outperform torsion balance and atomic clock constraints for ULDM coupled to electrons, muons, or gluons.
KW  - black hole, binary (INSPIRE)
KW  - cosmic string, stability (INSPIRE)
KW  - NANOGrav (INSPIRE)
KW  - new physics (INSPIRE)
KW  - dark matter (INSPIRE)
KW  - gravitational radiation (INSPIRE)
KW  - pulsar (INSPIRE)
KW  - observatory (INSPIRE)
KW  - critical phenomena (INSPIRE)
KW  - domain wall (INSPIRE)
KW  - inflation (INSPIRE)
KW  - background (INSPIRE)
KW  - torsion (INSPIRE)
KW  - structure (INSPIRE)
KW  - cosmological model (INSPIRE)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001023733700001
DO  - DOI:10.3847/2041-8213/acdc91
UR  - https://bib-pubdb1.desy.de/record/586790
ER  -