Zobrazeno 1 - 10
of 122
pro vyhledávání: '"Santos, F. B."'
We revisit the small field double-well inflationary model and investigate its observational viability in light of the current Cosmic Microwave Background data. In particular, considering scenarios with minimal and nonminimal coupling between the infl
Externí odkaz:
http://arxiv.org/abs/2409.13918
In the warm inflation scenario, the early cosmic acceleration is driven by the inflaton coupled to thermal fields, decaying into radiation and leaving a hot universe populated by relativistic particles after the end of inflation. The interaction is u
Externí odkaz:
http://arxiv.org/abs/2407.18891
Natural inflation is a well-motivated model for the early universe in which an inflaton potential of the pseudo-Nambu-Goldstone form, $V(\phi) = \Lambda^4[1 + \cos{(\phi/f)}]$, can naturally drive a cosmic accelerated epoch. This paper investigates t
Externí odkaz:
http://arxiv.org/abs/2312.12286
We investigate the impact of a non-minimal coupling of the scalar field with gravity in inflationary models, where a small coupling is allowed. As a concrete example, we consider the Witten-O'Raifeartaigh model, where, in line with other models, the
Externí odkaz:
http://arxiv.org/abs/2306.07260
Autor:
Tay, D., Shang, T., Rosa, Priscila F. S., Santos, F. B., Thompson, J. D., Fisk, Z., Ott, H. -R., Shiroka, T.
Publikováno v:
Phys. Rev. B 107, 064507 (2023) (Editors' Suggestion)
The ThIrSi superconductor, with $T_c = 6.5$ K, is expected to show unusual features in view of its noncentrosymmetric structure and the presence of heavy elements featuring a sizable spin-orbit coupling. Here, we report a comprehensive study of its e
Externí odkaz:
http://arxiv.org/abs/2302.08075
Autor:
Santos, F. B. M. dos
Publikováno v:
JCAP 06 (2023) 039
We establish constraints on $f(T)$ gravity by considering the possibility of a scenario that supports a phantom crossing of the equation of state parameter $\omega_{DE}$. After determining the viable parameter space of the model, while checking the i
Externí odkaz:
http://arxiv.org/abs/2211.16370
$\require{mediawiki-texvc}$The locally non-centrosymmetric superconductor SrPtAs is proposed to host a topological chiral $d$-wave state, but experimental reports have been limited to polycrystalline samples. Here we report the synthesis of single cr
Externí odkaz:
http://arxiv.org/abs/2210.12189
We investigate theoretical and observational aspects of a warm inflation scenario driven by the $\beta$-exponential potential, which generalizes the well-known power law inflation. In such a scenario, the decay of the inflaton field into radiation ha
Externí odkaz:
http://arxiv.org/abs/2209.06153
Autor:
Santos, F. B. M. dos, Silva, R.
In this work, we revisit the Witten-O'Raifeartaigh model of inflation, in which the potential takes a $\operatorname{log}^2(\phi/M)$ form, when the scalar field is non-minimally coupled to gravity. We investigate the impact of the coupling in the pre
Externí odkaz:
http://arxiv.org/abs/2204.13694
We establish new constraints on $f(T)$ gravity models by using cosmological data. In particular, we investigate the restrictions given by the gas mass fraction measurements of galaxy clusters and transversal BAO data. Both data sets are regarded as w
Externí odkaz:
http://arxiv.org/abs/2112.15249