Interferometer constraints on the inflationary field content
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In this paper, it was shown that a time-dependent sound speed for the helicity-2 modes can generate primordial gravitational waves with a blue-tilted spectrum, potentially detectable at interferometer scales.Abstract:
With an energy scale that can be as high as $10^{14}\,{\rm GeV}$, inflation may provide a unique probe of high-energy physics. Both scalar and tensor fluctuations generated during this early accelerated expansion contain crucial information about the particle content of the primordial universe. The advent of ground- and space-based interferometers enables us to probe primordial physics at length-scales much smaller than those corresponding to current CMB constraints. One key prediction of single-field slow-roll inflation is a red-tilted gravitational wave spectrum, currently inaccessible at interferometer scales. Interferometers probe directly inflationary physics that deviates from the minimal scenario and in particular additional particle content with sizeable couplings to the inflaton field. We adopt here an effective description for such fields and focus on the case of extra spin-2 fields. We find that a time-dependent sound speed for the helicity-2 modes can generate primordial gravitational waves with a blue-tilted spectrum, potentially detectable at interferometer scales.read more
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Implications of the NANOGrav results for inflation
TL;DR: In this paper, the authors examined whether the NANOGrav signal might be explained by an inflationary SGWB, focusing on the implications for the tensor spectral index and tensor-to-scalar ratio.
RepositoryDOI
EuCAPT White Paper: Opportunities and Challenges for Theoretical Astroparticle Physics in the Next Decade
R. Alves Batista,Amin,G. Barenboim,Nicola Bartolo,Daniel Baumann,A. Bauswein,Emilio Bellini,D. Benisty,Gianfranco Bertone,P. Blasi,C.G. Böhmer,Ž Bošnjak,T. Bringmann,Clare Burrage,M. Bustamante,J. Calderón Bustillo,C.T. Byrnes,F. Calore,R. Catena,D.G. Cerdeño,S.S. Cerri,Marco Chianese,Katy Clough,Alex Cole,P. Coloma,Adam Coogan,L. Covi,D. Cutting,A.C. Davis,C. De Rham,A. Di Matteo,G. Domènech,M. Drewes,T. Dietrich,T.D.P. Edwards,I. Esteban,R. Erdem,C. Evoli,Matteo Fasiello,S.M. Feeney,R.Z. Ferreira,A. Fialkov,N. Fornengo,S. Gabici,T. Galatyuk,Daniele Gaggero,D. Grasso,C. Guépin,J. Harz,M. Herrero-Valea,T. Hinderer,N.B. Hogg,D.C. Hooper,D. Iocco,J. Isern,Konstantin Karchev,Bradley J. Kavanagh,M. Korsmeier,K. Kotera,Kazuya Koyama,B. Krishnan,Julien Lesgourgues,J. Levi Said,Lucas Lombriser,C.S. Lorenz,S. Manconi,M. Mapelli,A. Marcowith,S.B. Markoff,D.J. Marsh,M. Martinelli,C.J.A.P. Martinsolami,P. Millington,P. Moesta,K. Nippel,V. Niro,E. O'Connor,F. Oikonomou,C.F. Paganini,G. Pagliaroli,Paolo Pani,C. Pfrommer,Silvia Pascoli,L. Pinol,L. Pizzuti,R.A. Porto,A. Pound,F. Quevedo,G.G. Raffelt,Alvise Raccanelli,E. Ramirez-Ruiz,M. Raveri,S. Renaux-Petel,Angelo Ricciardone,A. Rida Khalifeh,Antonio Riotto,R. Roiban,J. Rubio,M. Sahlén,Nashwan Sabti,L. Sagunski,N. Šarčević,K. Schmitz,Pedro Schwaller,T. Schwetz,A. Sedrakian,E. Sellentin,A. Serenelli,P.D. Serpico,E.I. Sfakianakis,S. Shalgar,A. Silvestri,I. Tamborra,Konstantinos Tanidis,D. Teresi,A.A. Tokareva,L. Tolos,S. Trojanowski,R. Trotta,C. Uhlemann,F.R. Urban,Filippo Vernizzi,A. van Vliet,F.L. Villante,A. Vincent,J. Vink,E. Vitagliano,Christophe Weniger,A. Wickenbrock,W. Winter,S. Zell,M. Zeng +131 more
TL;DR: The European Consortium for Astroparticle Theory (EuCAPT) white paper as mentioned in this paper explores upcoming theoretical opportunities and challenges for our field of research with particular emphasis on the possible synergies among different subfields, and the prospects for solving the most fundamental open questions with multi-messenger observations.
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Probing anisotropies of the Stochastic Gravitational Wave Background with LISA
N. Bartolo,Daniele Bertacca,Robert R. Caldwell,Carlo R. Contaldi,Giulia Cusin,V. De Luca,Emanuela Dimastrogiovanni,Matteo Fasiello,Daniel G. Figueroa,Gabriele Franciolini,Alexander C. Jenkins,Marco Peloso,Mauro Pieroni,Arianna I. Renzini,Angelo Ricciardone,Antonio Riotto,Mairi Sakellariadou,Lorenzo Sorbo,Gianmassimo Tasinato,Jesús Torrado,Sebastien Clesse,Sachiko Kuroyanagi +21 more
TL;DR: In this article , the authors investigated the sensitivity of the LISA to the anisotropies of the Stochastic Gravitational Wave Background (SGWB) with a power-law frequency profile.
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Multimessenger cosmology: Correlating cosmic microwave background and stochastic gravitational wave background measurements
Peter Adshead,Niayesh Afshordi,Emanuela Dimastrogiovanni,Matteo Fasiello,Matteo Fasiello,Eugene A. Lim,Gianmassimo Tasinato +6 more
TL;DR: In this paper, the existence of a primordial scalar-tensor tensor tensor tensor (STT) correlation in the squeezed configuration may be inferred from the effect that a long wavelength scalar mode has on the gravitational wave power spectrum: an anisotropic contribution.
Journal ArticleDOI
Blue-tilted inflationary tensor spectrum and reheating in the light of NANOGrav results
TL;DR: In this paper, the authors discuss the possibility of explaining the recent NANOGrav results by inflationary gravitational waves (IGWs) with a blue-tilted primordial spectrum.
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Journal ArticleDOI
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