Abstract
We investigate the reach of future gravitational wave (GW) detectors in probing inflaton couplings with visible sector particles that can either be bosonic or fermionic in nature. Assuming reheating takes place through perturbative quantum production from vacuum in presence of classical inflaton background field, we find that the spectral energy density of the primordial GW generated during inflation becomes sensitive to inflaton-matter coupling. We conclude, obeying bounds from Big Bang Nucleosysthesis and Cosmic Microwave Background, that, e.g., inflaton-scalar couplings of the order of ~ 𝒪(10−20) GeV fall within the sensitivity range of several proposed GW detector facilities. However, this prediction is sensitive to the size of the inflationary scale, nature of the inflaton-matter interaction and shape of the potential during reheating. Having found the time-dependent effective inflaton decay width, we also discuss its implications for dark matter (DM) production from the thermal plasma via UV freeze-in during reheating. It is shown, that one can reproduce the observed DM abundance for its mass up to several PeVs, depending on the dimension of the operator connecting DM with the thermal bath and the associated scale of the UV physics. Thus we promote primordial GW to observables sensitive to feebly coupled inflaton, which is very challenging if not impossible to test in conventional particle physics laboratories or astrophysical measurements.
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References
A.H. Guth, The Inflationary Universe: A Possible Solution to the Horizon and Flatness Problems, Phys. Rev. D 23 (1981) 347 [INSPIRE].
A.D. Linde, A New Inflationary Universe Scenario: A Possible Solution of the Horizon, Flatness, Homogeneity, Isotropy and Primordial Monopole Problems, Phys. Lett. B 108 (1982) 389 [INSPIRE].
M.A.G. Garcia, K. Kaneta, Y. Mambrini and K.A. Olive, Inflaton Oscillations and Post-Inflationary Reheating, JCAP 04 (2021) 012 [arXiv:2012.10756] [INSPIRE].
B. Barman, N. Bernal, Y. Xu and Ó. Zapata, Ultraviolet freeze-in with a time-dependent inflaton decay, JCAP 07 (2022) 019 [arXiv:2202.12906] [INSPIRE].
A. Ahmed, B. Grzadkowski and A. Socha, Implications of time-dependent inflaton decay on reheating and dark matter production, Phys. Lett. B 831 (2022) 137201 [arXiv:2111.06065] [INSPIRE].
A. Ahmed, B. Grzadkowski and A. Socha, Higgs boson induced reheating and ultraviolet frozen-in dark matter, JHEP 02 (2023) 196 [arXiv:2207.11218] [INSPIRE].
M. Giovannini, Gravitational waves constraints on postinflationary phases stiffer than radiation, Phys. Rev. D 58 (1998) 083504 [hep-ph/9806329] [INSPIRE].
M. Giovannini, Production and detection of relic gravitons in quintessential inflationary models, Phys. Rev. D 60 (1999) 123511 [astro-ph/9903004] [INSPIRE].
A. Riazuelo and J.-P. Uzan, Quintessence and gravitational waves, Phys. Rev. D 62 (2000) 083506 [astro-ph/0004156] [INSPIRE].
N. Seto and J.I. Yokoyama, Probing the equation of state of the early universe with a space laser interferometer, J. Phys. Soc. Jap. 72 (2003) 3082 [gr-qc/0305096] [INSPIRE].
L.A. Boyle and A. Buonanno, Relating gravitational wave constraints from primordial nucleosynthesis, pulsar timing, laser interferometers, and the CMB: Implications for the early Universe, Phys. Rev. D 78 (2008) 043531 [arXiv:0708.2279] [INSPIRE].
A. Stewart and R. Brandenberger, Observational Constraints on Theories with a Blue Spectrum of Tensor Modes, JCAP 08 (2008) 012 [arXiv:0711.4602] [INSPIRE].
B. Li and P.R. Shapiro, Precision cosmology and the stiff-amplified gravitational-wave background from inflation: NANOGrav, Advanced LIGO-Virgo and the Hubble tension, JCAP 10 (2021) 024 [arXiv:2107.12229] [INSPIRE].
M. Artymowski, O. Czerwinska, Z. Lalak and M. Lewicki, Gravitational wave signals and cosmological consequences of gravitational reheating, JCAP 04 (2018) 046 [arXiv:1711.08473] [INSPIRE].
C. Caprini and D.G. Figueroa, Cosmological Backgrounds of Gravitational Waves, Class. Quant. Grav. 35 (2018) 163001 [arXiv:1801.04268] [INSPIRE].
D. Bettoni, G. Domènech and J. Rubio, Gravitational waves from global cosmic strings in quintessential inflation, JCAP 02 (2019) 034 [arXiv:1810.11117] [INSPIRE].
D.G. Figueroa and E.H. Tanin, Ability of LIGO and LISA to probe the equation of state of the early Universe, JCAP 08 (2019) 011 [arXiv:1905.11960] [INSPIRE].
T. Opferkuch, P. Schwaller and B.A. Stefanek, Ricci Reheating, JCAP 07 (2019) 016 [arXiv:1905.06823] [INSPIRE].
N. Bernal, A. Ghoshal, F. Hajkarim and G. Lambiase, Primordial Gravitational Wave Signals in Modified Cosmologies, JCAP 11 (2020) 051 [arXiv:2008.04959] [INSPIRE].
A. Ghoshal, L. Heurtier and A. Paul, Signatures of non-thermal dark matter with kination and early matter domination. Gravitational waves versus laboratory searches, JHEP 12 (2022) 105 [arXiv:2208.01670] [INSPIRE].
R. Caldwell et al., Detection of early-universe gravitational-wave signatures and fundamental physics, Gen. Rel. Grav. 54 (2022) 156 [arXiv:2203.07972] [INSPIRE].
Y. Gouttenoire, G. Servant and P. Simakachorn, Kination cosmology from scalar fields and gravitational-wave signatures, arXiv:2111.01150 [INSPIRE].
V.K. Oikonomou, Effects of the axion through the Higgs portal on primordial gravitational waves during the electroweak breaking, Phys. Rev. D 107 (2023) 064071 [arXiv:2303.05889] [INSPIRE].
G. Jungman, M. Kamionkowski and K. Griest, Supersymmetric dark matter, Phys. Rept. 267 (1996) 195 [hep-ph/9506380] [INSPIRE].
G. Bertone, D. Hooper and J. Silk, Particle dark matter: Evidence, candidates and constraints, Phys. Rept. 405 (2005) 279 [hep-ph/0404175] [INSPIRE].
J.L. Feng, Dark Matter Candidates from Particle Physics and Methods of Detection, Ann. Rev. Astron. Astrophys. 48 (2010) 495 [arXiv:1003.0904] [INSPIRE].
L. Roszkowski, E.M. Sessolo and S. Trojanowski, WIMP dark matter candidates and searches—current status and future prospects, Rept. Prog. Phys. 81 (2018) 066201 [arXiv:1707.06277] [INSPIRE].
G. Arcadi et al., The waning of the WIMP? A review of models, searches, and constraints, Eur. Phys. J. C 78 (2018) 203 [arXiv:1703.07364] [INSPIRE].
J. McDonald, Thermally generated gauge singlet scalars as selfinteracting dark matter, Phys. Rev. Lett. 88 (2002) 091304 [hep-ph/0106249] [INSPIRE].
L.J. Hall, K. Jedamzik, J. March-Russell and S.M. West, Freeze-In Production of FIMP Dark Matter, JHEP 03 (2010) 080 [arXiv:0911.1120] [INSPIRE].
N. Bernal et al., The Dawn of FIMP Dark Matter: A Review of Models and Constraints, Int. J. Mod. Phys. A 32 (2017) 1730023 [arXiv:1706.07442] [INSPIRE].
F. Elahi, C. Kolda and J. Unwin, UltraViolet Freeze-in, JHEP 03 (2015) 048 [arXiv:1410.6157] [INSPIRE].
R.T. Co, E. Gonzalez and K. Harigaya, Increasing Temperature toward the Completion of Reheating, JCAP 11 (2020) 038 [arXiv:2007.04328] [INSPIRE].
A. Banerjee and D. Chowdhury, Fingerprints of freeze-in dark matter in an early matter-dominated era, SciPost Phys. 13 (2022) 022 [arXiv:2204.03670] [INSPIRE].
R. Kallosh and A. Linde, Universality Class in Conformal Inflation, JCAP 07 (2013) 002 [arXiv:1306.5220] [INSPIRE].
G.F. Giudice, E.W. Kolb and A. Riotto, Largest temperature of the radiation era and its cosmological implications, Phys. Rev. D 64 (2001) 023508 [hep-ph/0005123] [INSPIRE].
K. Ichikawa, T. Suyama, T. Takahashi and M. Yamaguchi, Primordial Curvature Fluctuation and Its Non-Gaussianity in Models with Modulated Reheating, Phys. Rev. D 78 (2008) 063545 [arXiv:0807.3988] [INSPIRE].
K. Kainulainen et al., Isocurvature Constraints on Portal Couplings, JCAP 06 (2016) 022 [arXiv:1601.07733] [INSPIRE].
S. Clery, Y. Mambrini, K.A. Olive and S. Verner, Gravitational portals in the early Universe, Phys. Rev. D 105 (2022) 075005 [arXiv:2112.15214] [INSPIRE].
R.T. Co, Y. Mambrini and K.A. Olive, Inflationary gravitational leptogenesis, Phys. Rev. D 106 (2022) 075006 [arXiv:2205.01689] [INSPIRE].
A. Ahmed, B. Grzadkowski and A. Socha, Higgs Boson-Induced Reheating and Dark Matter Production, Symmetry 14 (2022) 306 [INSPIRE].
L.A. Boyle and P.J. Steinhardt, Probing the early universe with inflationary gravitational waves, Phys. Rev. D 77 (2008) 063504 [astro-ph/0512014] [INSPIRE].
Y. Watanabe and E. Komatsu, Improved Calculation of the Primordial Gravitational Wave Spectrum in the Standard Model, Phys. Rev. D 73 (2006) 123515 [astro-ph/0604176] [INSPIRE].
K. Saikawa and S. Shirai, Primordial gravitational waves, precisely: The role of thermodynamics in the Standard Model, JCAP 05 (2018) 035 [arXiv:1803.01038] [INSPIRE].
J. Ghiglieri and M. Laine, Gravitational wave background from Standard Model physics: Qualitative features, JCAP 07 (2015) 022 [arXiv:1504.02569] [INSPIRE].
M. Maggiore, Gravitational wave experiments and early universe cosmology, Phys. Rept. 331 (2000) 283 [gr-qc/9909001] [INSPIRE].
S. Kuroyanagi, T. Chiba and N. Sugiyama, Precision calculations of the gravitational wave background spectrum from inflation, Phys. Rev. D 79 (2009) 103501 [arXiv:0804.3249] [INSPIRE].
R. Allahverdi et al., The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe, arXiv:2006.16182 [https://doi.org/10.21105/astro.2006.16182] [INSPIRE].
G. Choi, R. Jinno and T.T. Yanagida, Probing PeV scale SUSY breaking with satellite galaxies and primordial gravitational waves, Phys. Rev. D 104 (2021) 095018 [arXiv:2107.12804] [INSPIRE].
D.G. Figueroa and E.H. Tanin, Inconsistency of an inflationary sector coupled only to Einstein gravity, JCAP 10 (2019) 050 [arXiv:1811.04093] [INSPIRE].
S. Dodelson and M.S. Turner, Nonequilibrium neutrino statistical mechanics in the expanding universe, Phys. Rev. D 46 (1992) 3372 [INSPIRE].
S. Hannestad and J. Madsen, Neutrino decoupling in the early universe, Phys. Rev. D 52 (1995) 1764 [astro-ph/9506015] [INSPIRE].
A.D. Dolgov, S.H. Hansen and D.V. Semikoz, Nonequilibrium corrections to the spectra of massless neutrinos in the early universe, Nucl. Phys. B 503 (1997) 426 [hep-ph/9703315] [INSPIRE].
G. Mangano et al., Relic neutrino decoupling including flavor oscillations, Nucl. Phys. B 729 (2005) 221 [hep-ph/0506164] [INSPIRE].
P.F. de Salas and S. Pastor, Relic neutrino decoupling with flavour oscillations revisited, JCAP 07 (2016) 051 [arXiv:1606.06986] [INSPIRE].
M. Escudero Abenza, Precision early universe thermodynamics made simple: Neff and neutrino decoupling in the Standard Model and beyond, JCAP 05 (2020) 048 [arXiv:2001.04466] [INSPIRE].
K. Akita and M. Yamaguchi, A precision calculation of relic neutrino decoupling, JCAP 08 (2020) 012 [arXiv:2005.07047] [INSPIRE].
J. Froustey, C. Pitrou and M.C. Volpe, Neutrino decoupling including flavour oscillations and primordial nucleosynthesis, JCAP 12 (2020) 015 [arXiv:2008.01074] [INSPIRE].
J.J. Bennett et al., Towards a precision calculation of Neff in the Standard Model II: Neutrino decoupling in the presence of flavour oscillations and finite-temperature QED, JCAP 04 (2021) 073 [arXiv:2012.02726] [INSPIRE].
S. Kuroyanagi, T. Takahashi and S. Yokoyama, Blue-tilted Tensor Spectrum and Thermal History of the Universe, JCAP 02 (2015) 003 [arXiv:1407.4785] [INSPIRE].
Planck collaboration, Planck 2018 results. VI. Cosmological parameters, Astron. Astrophys. 641 (2020) A6 [Erratum ibid. 652 (2021) C4] [arXiv:1807.06209] [INSPIRE].
T.-H. Yeh, J. Shelton, K.A. Olive and B.D. Fields, Probing physics beyond the standard model: limits from BBN and the CMB independently and combined, JCAP 10 (2022) 046 [arXiv:2207.13133] [INSPIRE].
K. Abazajian et al., CMB-S4 Science Case, Reference Design, and Project Plan, arXiv:1907.04473 [INSPIRE].
CMB-HD collaboration, Snowmass2021 CMB-HD White Paper, arXiv:2203.05728 [INSPIRE].
COrE collaboration, COrE (Cosmic Origins Explorer) A White Paper, arXiv:1102.2181 [INSPIRE].
EUCLID collaboration, Euclid Definition Study Report, arXiv:1110.3193 [INSPIRE].
S. Sarkar, Big bang nucleosynthesis and physics beyond the standard model, Rept. Prog. Phys. 59 (1996) 1493 [hep-ph/9602260] [INSPIRE].
M. Kawasaki and T. Moroi, Gravitino production in the inflationary universe and the effects on big bang nucleosynthesis, Prog. Theor. Phys. 93 (1995) 879 [hep-ph/9403364] [INSPIRE].
M. Kawasaki, K. Kohri and N. Sugiyama, MeV scale reheating temperature and thermalization of neutrino background, Phys. Rev. D 62 (2000) 023506 [astro-ph/0002127] [INSPIRE].
S. Hannestad, What is the lowest possible reheating temperature?, Phys. Rev. D 70 (2004) 043506 [astro-ph/0403291] [INSPIRE].
F. De Bernardis, L. Pagano and A. Melchiorri, New constraints on the reheating temperature of the universe after WMAP-5, Astropart. Phys. 30 (2008) 192 [INSPIRE].
P.F. de Salas et al., Bounds on very low reheating scenarios after Planck, Phys. Rev. D 92 (2015) 123534 [arXiv:1511.00672] [INSPIRE].
T. Hasegawa et al., MeV-scale reheating temperature and thermalization of oscillating neutrinos by radiative and hadronic decays of massive particles, JCAP 12 (2019) 012 [arXiv:1908.10189] [INSPIRE].
M.R. Haque and D. Maity, Gravitational reheating, Phys. Rev. D 107 (2023) 043531 [arXiv:2201.02348] [INSPIRE].
S. Clery et al., Gravitational portals with nonminimal couplings, Phys. Rev. D 105 (2022) 095042 [arXiv:2203.02004] [INSPIRE].
M.D.R. Haque, D. Maity and R. Mondal, WIMPs, FIMPs, and Inflaton phenomenology via reheating, CMB and ∆Neff, arXiv:2301.01641 [INSPIRE].
R. Brandenberger, V. Kamali and R. O. Ramos, Minimal Preheating, arXiv:2305.11246 [INSPIRE].
L. Kofman, A.D. Linde and A.A. Starobinsky, Reheating after inflation, Phys. Rev. Lett. 73 (1994) 3195 [hep-th/9405187] [INSPIRE].
Y. Shtanov, J.H. Traschen and R.H. Brandenberger, Universe reheating after inflation, Phys. Rev. D 51 (1995) 5438 [hep-ph/9407247] [INSPIRE].
A.D. Dolgov and D.P. Kirillova, On particle creation by a time-dependent scalar field, JINR-E2-89-321, Sov. J. Nucl. Phys., 51 (1990) 172.
L. Kofman, A.D. Linde and A.A. Starobinsky, Towards the theory of reheating after inflation, Phys. Rev. D 56 (1997) 3258 [hep-ph/9704452] [INSPIRE].
M.A.G. Garcia and M. Pierre, Reheating after Inflaton Fragmentation, arXiv:2306.08038 [INSPIRE].
D.G. Figueroa and F. Torrenti, Gravitational wave production from preheating: parameter dependence, JCAP 10 (2017) 057 [arXiv:1707.04533] [INSPIRE].
C. Cosme, D.G. Figueroa and N. Loayza, Gravitational wave production from preheating with trilinear interactions, JCAP 05 (2023) 023 [arXiv:2206.14721] [INSPIRE].
K. Schmitz, New Sensitivity Curves for Gravitational-Wave Signals from Cosmological Phase Transitions, JHEP 01 (2021) 097 [arXiv:2002.04615] [INSPIRE].
LIGO Scientific and Virgo collaborations, Observation of Gravitational Waves from a Binary Black Hole Merger, Phys. Rev. Lett. 116 (2016) 061102 [arXiv:1602.03837] [INSPIRE].
LIGO Scientific and Virgo collaborations, GW151226: Observation of Gravitational Waves from a 22-Solar-Mass Binary Black Hole Coalescence, Phys. Rev. Lett. 116 (2016) 241103 [arXiv:1606.04855] [INSPIRE].
LIGO Scientific and Virgo collaborations, GW170104: Observation of a 50-Solar-Mass Binary Black Hole Coalescence at Redshift 0.2, Phys. Rev. Lett. 118 (2017) 221101 [Erratum ibid. 121 (2018) 129901] [arXiv:1706.01812] [INSPIRE].
LIGO Scientific and Virgo collaborations, GW170608: Observation of a 19-solar-mass Binary Black Hole Coalescence, Astrophys. J. Lett. 851 (2017) L35 [arXiv:1711.05578] [INSPIRE].
LIGO Scientific and Virgo collaborations, GW170814: A Three-Detector Observation of Gravitational Waves from a Binary Black Hole Coalescence, Phys. Rev. Lett. 119 (2017) 141101 [arXiv:1709.09660] [INSPIRE].
LIGO Scientific and Virgo collaborations, GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral, Phys. Rev. Lett. 119 (2017) 161101 [arXiv:1710.05832] [INSPIRE].
LISA collaboration, Laser Interferometer Space Antenna, arXiv:1702.00786 [INSPIRE].
J. Baker et al., The Laser Interferometer Space Antenna: Unveiling the Millihertz Gravitational Wave Sky, arXiv:1907.06482 [INSPIRE].
LIGO Scientific collaboration, Exploring the Sensitivity of Next Generation Gravitational Wave Detectors, Class. Quant. Grav. 34 (2017) 044001 [arXiv:1607.08697] [INSPIRE].
D. Reitze et al., Cosmic Explorer: The U.S. Contribution to Gravitational-Wave Astronomy beyond LIGO, Bull. Am. Astron. Soc. 51 (2019) 035 [arXiv:1907.04833] [INSPIRE].
M. Punturo et al., The Einstein Telescope: A third-generation gravitational wave observatory, Class. Quant. Grav. 27 (2010) 194002 [INSPIRE].
S. Hild et al., Sensitivity Studies for Third-Generation Gravitational Wave Observatories, Class. Quant. Grav. 28 (2011) 094013 [arXiv:1012.0908] [INSPIRE].
J. Crowder and N.J. Cornish, Beyond LISA: Exploring future gravitational wave missions, Phys. Rev. D 72 (2005) 083005 [gr-qc/0506015] [INSPIRE].
V. Corbin and N.J. Cornish, Detecting the cosmic gravitational wave background with the big bang observer, Class. Quant. Grav. 23 (2006) 2435 [gr-qc/0512039] [INSPIRE].
N. Seto, S. Kawamura and T. Nakamura, Possibility of direct measurement of the acceleration of the universe using 0.1-Hz band laser interferometer gravitational wave antenna in space, Phys. Rev. Lett. 87 (2001) 221103 [astro-ph/0108011] [INSPIRE].
H. Kudoh, A. Taruya, T. Hiramatsu and Y. Himemoto, Detecting a gravitational-wave background with next-generation space interferometers, Phys. Rev. D 73 (2006) 064006 [gr-qc/0511145] [INSPIRE].
K. Nakayama and J. Yokoyama, Gravitational Wave Background and Non-Gaussianity as a Probe of the Curvaton Scenario, JCAP 01 (2010) 010 [arXiv:0910.0715] [INSPIRE].
K. Yagi and N. Seto, Detector configuration of DECIGO/BBO and identification of cosmological neutron-star binaries, Phys. Rev. D 83 (2011) 044011 [Erratum ibid. 95 (2017) 109901] [arXiv:1101.3940] [INSPIRE].
S. Kawamura et al., Current status of space gravitational wave antenna DECIGO and B-DECIGO, PTEP 2021 (2021) 05A105 [arXiv:2006.13545] [INSPIRE].
A. Sesana et al., Unveiling the gravitational universe at μ-Hz frequencies, Exper. Astron. 51 (2021) 1333 [arXiv:1908.11391] [INSPIRE].
A. Vallenari, The Future of Astrometry in Space, Frontiers in Astronomy and Space Sciences 5 (2018).
AEDGE collaboration, AEDGE: Atomic Experiment for Dark Matter and Gravity Exploration in Space, EPJ Quant. Technol. 7 (2020) 6 [arXiv:1908.00802] [INSPIRE].
L. Badurina et al., Prospective sensitivities of atom interferometers to gravitational waves and ultralight dark matter, Phil. Trans. A. Math. Phys. Eng. Sci. 380 (2021) 20210060 [arXiv:2108.02468] [INSPIRE].
P.W. Graham, J.M. Hogan, M.A. Kasevich and S. Rajendran, Resonant mode for gravitational wave detectors based on atom interferometry, Phys. Rev. D 94 (2016) 104022 [arXiv:1606.01860] [INSPIRE].
MAGIS collaboration, Mid-band gravitational wave detection with precision atomic sensors, arXiv:1711.02225 [INSPIRE].
L. Badurina et al., AION: An Atom Interferometer Observatory and Network, JCAP 05 (2020) 011 [arXiv:1911.11755] [INSPIRE].
Y. Ueno and K. Yamamoto, Constraints on α-attractor inflation and reheating, Phys. Rev. D 93 (2016) 083524 [arXiv:1602.07427] [INSPIRE].
M. Drewes and J.U. Kang, The Kinematics of Cosmic Reheating, Nucl. Phys. B 875 (2013) 315 [arXiv:1305.0267] [INSPIRE].
D. Chowdhury and A. Hait, Thermalization in the presence of a time-dependent dissipation and its impact on dark matter production, arXiv:2302.06654 [INSPIRE].
N. Bernal, F. Elahi, C. Maldonado and J. Unwin, Ultraviolet Freeze-in and Non-Standard Cosmologies, JCAP 11 (2019) 026 [arXiv:1909.07992] [INSPIRE].
K. Kaneta, Y. Mambrini and K.A. Olive, Radiative production of nonthermal dark matter, Phys. Rev. D 99 (2019) 063508 [arXiv:1901.04449] [INSPIRE].
B. Barman, D. Borah and R. Roshan, Effective Theory of Freeze-in Dark Matter, JCAP 11 (2020) 021 [arXiv:2007.08768] [INSPIRE].
A. Chakraborty, M.R. Haque, D. Maity and R. Mondal, Inflaton phenomenology via reheating in light of primordial gravitational waves and the latest BICEP/Keck data, Phys. Rev. D 108 (2023) 023515 [arXiv:2304.13637] [INSPIRE].
Planck collaboration, Planck 2018 results. X. Constraints on inflation, Astron. Astrophys. 641 (2020) A10 [arXiv:1807.06211] [INSPIRE].
BICEP and Keck collaborations, Improved Constraints on Primordial Gravitational Waves using Planck, WMAP, and BICEP/Keck Observations through the 2018 Observing Season, Phys. Rev. Lett. 127 (2021) 151301 [arXiv:2110.00483] [INSPIRE].
M. Tristram et al., Improved limits on the tensor-to-scalar ratio using BICEP and Planck data, Phys. Rev. D 105 (2022) 083524 [arXiv:2112.07961] [INSPIRE].
Acknowledgments
This project is supported in part by the National Science Centre (Poland) as a research project no 2020/37/B/ST2/02746. BB would like to thank Riajul Haque for fruitful discussions.
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Barman, B., Ghoshal, A., Grzadkowski, B. et al. Measuring inflaton couplings via primordial gravitational waves. J. High Energ. Phys. 2023, 231 (2023). https://doi.org/10.1007/JHEP07(2023)231
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DOI: https://doi.org/10.1007/JHEP07(2023)231