Built on

C. Wetterich, Quantum scale symmetry , 1901.04741
Original
1901
Earlier work this paper cites.
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Original
1901
Earlier work this paper cites.
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Original
1902
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1902
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1902
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1903
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1903
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F. Bezrukov, D. Gorbunov, C. Shepherd and A. Tokareva, Some like it hot: R 2 R^{2} heals Higgs inflation, but does not cool it , Phys. Lett. B 795
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1904
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Original
1905
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M. Benetti, L. Graef and R.O. Ramos, Observational Constraints on Warm Inflation in Loop Quantum Cosmology , JCAP 10
Original
1907
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Simons Observatory
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1907
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1907
Earlier work this paper cites.
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1907
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1908
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2024

Testing scale-invariant inflation against cosmological data

Cecchini, Chiara, De Angelis, Mariaveronica, Giarè, William et al.

Understand

There is solid theoretical and observational motivation behind the idea of scale-invariance as a fundamental symmetry of Nature.

We consider a recently proposed classically scale-invariant inflationary model, quadratic in curvature and featuring a scalar field non-minimally coupled to gravity.
We go beyond earlier analytical studies, which showed that the model predicts inflationary observables in qualitative agreement with data, by solving the full two-field dynamics of the system -- this allows us to corroborate previous analytical findings and set robust constraints on the model's parameters using the latest Cosmic Microwave Background (CMB) data from Planck and BICEP/Keck.
We demonstrate that scale-invariance constrains the two-field trajectory such that the effective dynamics are that of a single field, resulting in vanishing entropy perturbations and protecting the model from destabilization effects.

Built on

C. Wetterich, Quantum scale symmetry , 1901.04741
Original
1901
Earlier work this paper cites.
D.D. Canko, I.D. Gialamas and G.P. Kodaxis, A simple F ⁡ ( ℛ , ϕ ) F(\mathcal{R},\phi) deformation of Starobinsky inflationary model , Eur. Phys. J. C 80
Original
1901
Earlier work this paper cites.
D. Chowdhury, J. Martin, C. Ringeval and V. Vennin, Assessing the scientific status of inflation after Planck , Phys. Rev. D 100
Original
1902
Earlier work this paper cites.
S. Nojiri, S.D. Odintsov and V.K. Oikonomou, k k -essence f ⁡ ( R ) f(R) gravity inflation , Nucl. Phys. B 941
Original
1902
Earlier work this paper cites.
S. Vicentini, L. Vanzo and M. Rinaldi, Scale-invariant inflation with one-loop quantum corrections , Phys. Rev. D 99
Original
1902
Earlier work this paper cites.
E. Palti, The Swampland: Introduction and Review , Fortsch. Phys. 67
Original
1903
Earlier work this paper cites.
A. Bonanno and S. Silveravalle, Characterizing black hole metrics in quadratic gravity , Phys. Rev. D 99
Original
1903
Earlier work this paper cites.
F. Bezrukov, D. Gorbunov, C. Shepherd and A. Tokareva, Some like it hot: R 2 R^{2} heals Higgs inflation, but does not cool it , Phys. Lett. B 795
Original
1904
Earlier work this paper cites.
M.-X. Lin, G. Benevento, W. Hu and M. Raveri, Acoustic Dark Energy: Potential Conversion of the Hubble Tension , Phys. Rev. D 100
Original
1905
Earlier work this paper cites.
M. Benetti, L. Graef and R.O. Ramos, Observational Constraints on Warm Inflation in Loop Quantum Cosmology , JCAP 10
Original
1907
Earlier work this paper cites.
Simons Observatory
Original
1907
Earlier work this paper cites.
A. Salvio, Quasi-Conformal Models and the Early Universe , Eur. Phys. J. C 79
Original
1907
Earlier work this paper cites.
Y. Ema, Dynamical Emergence of Scalaron in Higgs Inflation , JCAP 09
Original
1907
Earlier work this paper cites.
J. Haro, J. Amorós and S. Pan, Scaling solutions in quintessential inflation , Eur. Phys. J. C 80
Original
1908
Earlier work this paper cites.
V. Gakis, M. Krššák, J. Levi Said and E.N. Saridakis, Conformal gravity and transformations in the symmetric teleparallel framework , Phys. Rev. D 101
Original
1908
Earlier work this paper cites.
A. Bedroya, R. Brandenberger, M. Loverde and C. Vafa, Trans-Planckian Censorship and Inflationary Cosmology , Phys. Rev. D 101
Original
1909
Earlier work this paper cites.
H. Geng, A potential mechanism for inflation from swampland conjectures , Phys. Lett. B 805
Original
1910
Earlier work this paper cites.
R.-Y. Guo, J.-F. Zhang and X. Zhang, Inflation model selection revisited after a 1.91% measurement of the Hubble constant , Sci. China Phys. Mech. Astron. 63
Original
1910
Earlier work this paper cites.
P.G. Ferreira and O.J. Tattersall, Scale Invariant Gravity and Black Hole Ringdown , Phys. Rev. D 101
Original
1910
Earlier work this paper cites.
H.-H. Li, G. Ye, Y. Cai and Y.-S. Piao, Trans-Planckian censorship of multistage inflation and dark energy , Phys. Rev. D 101
Original
1911
Earlier work this paper cites.
M. Giovannini, Primordial backgrounds of relic gravitons , Prog. Part. Nucl. Phys. 112
Original
1912
Earlier work this paper cites.
H.A. Buchdahl, Non-Linear Lagrangians and Cosmological Theory , Mon. Not. Roy. Astron. Soc. 150
1970
Earlier work this paper cites.
S.R. Coleman and E.J. Weinberg, Radiative Corrections as the Origin of Spontaneous Symmetry Breaking , Phys. Rev. D 7
1973
Earlier work this paper cites.
F. Englert, C. Truffin and R. Gastmans, Conformal Invariance in Quantum Gravity , Nucl. Phys. B 117
1976
Earlier work this paper cites.
K.S. Stelle, Renormalization of Higher Derivative Quantum Gravity , Phys. Rev. D 16
1977
Earlier work this paper cites.
D. Kazanas, Dynamics of the Universe and Spontaneous Symmetry Breaking , Astrophys. J. Lett. 241
1980
Earlier work this paper cites.
A.A. Starobinsky, A New Type of Isotropic Cosmological Models Without Singularity , Phys. Lett. B 91
1980
Earlier work this paper cites.
K. Sato, Cosmological Baryon Number Domain Structure and the First Order Phase Transition of a Vacuum , Phys. Lett. B 99
1981
Earlier work this paper cites.
A.H. Guth, The Inflationary Universe: A Possible Solution to the Horizon and Flatness Problems , Phys. Rev. D 23
1981
Earlier work this paper cites.
V.F. Mukhanov and G.V. Chibisov, Quantum Fluctuations and a Nonsingular Universe , JETP Lett. 33
1981
Earlier work this paper cites.
F. Cooper and G. Venturi, Cosmology and Broken Scale Invariance , Phys. Rev. D 24
1981
Earlier work this paper cites.
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
Earlier work this paper cites.
A. Albrecht and P.J. Steinhardt, Cosmology for Grand Unified Theories with Radiatively Induced Symmetry Breaking , Phys. Rev. Lett. 48
1982
Earlier work this paper cites.
C. Wetterich, Cosmology and the Fate of Dilatation Symmetry , Nucl. Phys. B 302
Original
1988
Earlier work this paper cites.
R. Fakir and W.G. Unruh, Improvement on cosmological chaotic inflation through nonminimal coupling , Phys. Rev. D 41
1990
Earlier work this paper cites.
A. Gelman and D.B. Rubin, Inference from Iterative Simulation Using Multiple Sequences , Statist. Sci. 7
1992
Earlier work this paper cites.
D.I. Kaiser, Primordial spectral indices from generalized Einstein theories , Phys. Rev. D 52
1995
Earlier work this paper cites.
R. Hempfling, The Next-to-minimal Coleman-Weinberg model , Phys. Lett. B 379
1996
Earlier work this paper cites.
M. Sasaki and E.D. Stewart, A General analytic formula for the spectral index of the density perturbations produced during inflation , Prog. Theor. Phys. 95
1996
Earlier work this paper cites.
C. Gordon, D. Wands, B.A. Bassett and R. Maartens, Adiabatic and entropy perturbations from inflation , Phys. Rev. D 63
2000
Earlier work this paper cites.
G. Ye and Y.-S. Piao, Is the Hubble tension a hint of AdS phase around recombination? , Phys. Rev. D 101
Original
2001
Earlier work this paper cites.
D. Wands, N. Bartolo, S. Matarrese and A. Riotto, An Observational test of two-field inflation , Phys. Rev. D 66
2002
Earlier work this paper cites.
W. Giarè and A. Melchiorri, Probing the inflationary background of gravitational waves from large to small scales , Phys. Lett. B 815
Original
2003
Earlier work this paper cites.
U. Aydemir, B. Holdom and J. Ren, Not quite black holes as dark matter , Phys. Rev. D 102
Original
2003
Earlier work this paper cites.
F. Di Marco, F. Finelli and R. Brandenberger, Adiabatic and isocurvature perturbations for multifield generalized Einstein models , Phys. Rev. D 67
2003
Earlier work this paper cites.
S.D. Odintsov and V.K. Oikonomou, Swampland implications of GW170817-compatible Einstein-Gauss-Bonnet gravity , Phys. Lett. B 805
Original
2004
Earlier work this paper cites.
M. Braglia, D.K. Hazra, L. Sriramkumar and F. Finelli, Generating primordial features at large scales in two field models of inflation , JCAP 08
Original
2004
Earlier work this paper cites.
M. Cicoli and E. Di Valentino, Fitting string inflation to real cosmological data: The fiber inflation case , Phys. Rev. D 102
Original
2004
Earlier work this paper cites.
A. Vallinotto, E.J. Copeland, E.W. Kolb, A.R. Liddle and D.A. Steer, Inflationary potentials yielding constant scalar perturbation spectral indices , Phys. Rev. D 69
2004
Earlier work this paper cites.
N. Das and S. Panda, Inflation and Reheating in f(R,h) theory formulated in the Palatini formalism , JCAP 05
Original
2005
Earlier work this paper cites.
M. Braglia, W.T. Emond, F. Finelli, A.E. Gumrukcuoglu and K. Koyama, Unified framework for early dark energy from α \alpha -attractors , Phys. Rev. D 102
Original
2005
Earlier work this paper cites.
A.A. Starobinsky, Inflaton field potential producing the exactly flat spectrum of adiabatic perturbations , JETP Lett. 82
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