Fetching the paper…

Reading the bibliography…

2025

Palatini Linear Attractors Are Back in ACTion

Dioguardi, Christian, Karam, Alexandros

Original
PDF
Post on X

Understand

Recent results from the Atacama Cosmology Telescope (ACT) indicate a scalar spectral index $n_s \simeq 0.9743$, in excellent agreement with the prediction of linear inflation.

However, the corresponding tensor-to-scalar ratio $r \simeq 0.0667$ is in tension with current observational bounds.
In this work, we investigate how this tension can be alleviated in the Palatini formulation of gravity.
We consider two classes of models based on simple monomial potentials: (i) models with a non-minimal coupling between the inflaton and gravity, and (ii) models including an $\alpha R^2$ term.

Palatini Linear Attractors Are Back in ACTion · Around

Built on

A. A. Starobinsky, Phys. Lett. B91
1980
Earlier work this paper cites.
A. H. Guth, Phys.Rev. D23
1981
Earlier work this paper cites.
A. D. Linde, Phys.Lett. B108
1982
Earlier work this paper cites.
A. Albrecht and P. J. Steinhardt, Phys.Rev.Lett. 48
1982
Earlier work this paper cites.
T. Tenkanen and E. Tomberg, JCAP 04
Original
2002
Earlier work this paper cites.
T. Koivisto and H. Kurki-Suonio, Class. Quant. Grav. 23
2006
Earlier work this paper cites.
I. D. Gialamas, A. Karam, and A. Racioppi, JCAP 11
Original
2006
Earlier work this paper cites.
F. Bauer and D. A. Demir, Phys. Lett. B665
Original
2008
Earlier work this paper cites.
A. Racioppi, Phys. Rev. D 97
Original
2018
Earlier work this paper cites.

Similar

I. Antoniadis, A. Karam, A. Lykkas, and K. Tamvakis, JCAP 11
Original
2018
Cited alongside, same era.
V.-M. Enckell, K. Enqvist, S. Rasanen, and L.-P. Wahlman, JCAP 02
Original
2019
Cited alongside, same era.
Y. Akrami et al. (Planck), Astron. Astrophys. 641
Original
2020
Cited alongside, same era.
A. Karam, E. Tomberg, and H. Veermäe, JCAP 06
Original
2021
Cited alongside, same era.
P. A. R. Ade et al. (BICEP, Keck), Phys. Rev. Lett. 127
Original
2021
Cited alongside, same era.

Then

T. Louis et al. (ACT), (2025), arXiv:2503.14452 [astro-ph.CO]
Original
2025
Closest in time.
E. Calabrese et al. (ACT), (2025), arXiv:2503.14454 [astro-ph.CO]
Original
2025
Closest in time.
R. Kallosh, A. Linde, and D. Roest, (2025), arXiv:2503.21030 [hep-th]
Original
2025
Closest in time.
S. Aoki, H. Otsuka, and R. Yanagita, (2025), arXiv:2504.01622 [hep-ph]
Original
2025
Closest in time.
C. Dioguardi, A. J. Iovino, and A. Racioppi, (2025), arXiv:2504.02809 [gr-qc]
Original
2025
Closest in time.

Beyond the bibliography

alphaXiv searches the wider corpus for related work and actual follow-ups.

Open on alphaXiv

alphaXiv is searching for related work…

C. Dioguardi, A. Racioppi, and E. Tomberg, JHEP 06

2022

Cited alongside, same era.

I. D. Gialamas, A. Karam, T. D. Pappas, and E. Tomberg, Int. J. Geom. Meth. Mod. Phys. 20

2023

Cited alongside, same era.

C. Dioguardi, A. Racioppi, and E. Tomberg, JCAP 03

2024

Cited alongside, same era.

C. Dioguardi and A. Racioppi, Phys. Dark Univ. 45

2024

Cited alongside, same era.

A. G. Adame et al. (DESI), JCAP 02

Cited in the paper.

A. G. Adame et al. (DESI), JCAP 04

Cited in the paper.

A. Salvio, (2025), arXiv:2504.10488 [hep-ph]

2025

Closest in time.

I. D. Gialamas, A. Karam, A. Racioppi, and M. Raidal, (2025), arXiv:2504.06002 [astro-ph.CO]

2025

Closest in time.

K. Dimopoulos, C. Dioguardi, G. Hütsi, and A. Racioppi, (2025), arXiv:2503.21610 [gr-qc]

Original

2025

Closest in time.

N. Bostan, R. H. Dejrah, C. Dioguardi, and A. Racioppi, (2025), arXiv:2503.16324 [gr-qc]

2025

Closest in time.