The NANOGrav 15 yr Data Set: Running of the Spectral Index

The NANOGrav 15-year data provides compelling evidence for a stochastic gravitational-wave (GW) background at nanohertz frequencies. The simplest model-independent approach to characterizing the frequency spectrum of this signal consists in a simple power-law fit involving two parameters: an amplitu...

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Hauptverfasser: Agazie, Gabriella, Anumarlapudi, Akash, Archibald, Anne M, Arzoumanian, Zaven, Baier, Jeremy George, Baker, Paul T, Blecha, Laura, Brazier, Adam, Brook, Paul R, Burke-Spolaor, Sarah, Casey-Clyde, J. Andrew, Charisi, Maria, Chatterjee, Shami, Cohen, Tyler, Cordes, James M, Cornish, Neil J, Crawford, Fronefield, Cromartie, H. Thankful, Crowter, Kathryn, DeCesar, Megan E, Demorest, Paul B, Deng, Heling, Dolch, Timothy, Esmyol, David, Ferrara, Elizabeth C, Fiore, William, Fonseca, Emmanuel, Freedman, Gabriel E, Gardiner, Emiko C, Garver-Daniels, Nate, Gentile, Peter A, Gersbach, Kyle A, Glaser, Joseph, Good, Deborah C, Gültekin, Kayhan, Hazboun, Jeffrey S, Jennings, Ross J, Johnson, Aaron D, Jones, Megan L, Kaplan, David L, Kelley, Luke Zoltan, Kerr, Matthew, Key, Joey S, Laal, Nima, Lamb, William G, Larsen, Bjorn, Lazio, T. Joseph W, Lewandowska, Natalia, Santos, Rafael R. Lino dos, Liu, Tingting, Lorimer, Duncan R, Luo, Jing, Lynch, Ryan S, Ma, Chung-Pei, Madison, Dustin R, McEwen, Alexander, McKee, James W, McLaughlin, Maura A, McMann, Natasha, Meyers, Bradley W, Meyers, Patrick M, Mingarelli, Chiara M. F, Mitridate, Andrea, Ng, Cherry, Nice, David J, Ocker, Stella Koch, Olum, Ken D, Pennucci, Timothy T, Perera, Benetge B. P, Pol, Nihan S, Radovan, Henri A, Ransom, Scott M, Ray, Paul S, Romano, Joseph D, Runnoe, Jessie C, Saffer, Alexander, Sardesai, Shashwat C, Schmiedekamp, Ann, Schmiedekamp, Carl, Schröder, Tobias, Shapiro-Albert, Brent J, Siemens, Xavier, Simon, Joseph, Siwek, Magdalena S, Fiscella, Sophia V. Sosa, Stairs, Ingrid H, Stinebring, Daniel R, Stovall, Kevin, Susobhanan, Abhimanyu, Swiggum, Joseph K, Taylor, Stephen R, Turner, Jacob E, Unal, Caner, Vallisneri, Michele, van Haasteren, Rutger, Vigeland, Sarah J, von Eckardstein, Richard, Witt, Caitlin A, Wright, David, Young, Olivia
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