Zobrazeno 1 - 10
of 2 617
pro vyhledávání: '"Pereira, A. S. P."'
Cosmological data collected on a sphere, such as CMB anisotropies, are typically represented by the spherical harmonic coefficients, denoted as $a_{\ell m}$. The angular power spectrum, or $C_\ell$, serves as the fundamental estimator of the variance
Externí odkaz:
http://arxiv.org/abs/2411.08087
Publikováno v:
Entropy 26(11), 947 (2024)
This review delves into the pivotal primordial stage of the universe, a period that holds the key to understanding its current state. To fully grasp this epoch, it is essential to consider three fundamental domains of physics: gravity, particle physi
Externí odkaz:
http://arxiv.org/abs/2411.03018
Autor:
Valdrighi, Giovani, Ribeiro, Athyrson M., Pereira, Jansen S. B., Guardieiro, Vitoria, Hendricks, Arthur, Filho, Décio Miranda, Garcia, Juan David Nieto, Bocca, Felipe F., Veronese, Thalita B., Wanner, Lucas, Raimundo, Marcos Medeiros
The widespread use of machine learning in credit scoring has brought significant advancements in risk assessment and decision-making. However, it has also raised concerns about potential biases, discrimination, and lack of transparency in these autom
Externí odkaz:
http://arxiv.org/abs/2409.20536
We investigate the phenomenon of gravitational baryogenesis within the context of a specific modified theory of gravity, namely, energy-momentum squared gravity or $f(R, T_{\mu\nu}T^{\mu\nu})$ gravity. In this framework, the gravitational Lagrangian
Externí odkaz:
http://arxiv.org/abs/2409.04623
Autor:
Saha, Samanta, Copi, Craig J., Starkman, Glenn D., Anselmi, Stefano, Duque, Javier Carrón, Barandiaran, Mikel Martin, Akrami, Yashar, Cornet-Gomez, Fernando, Jaffe, Andrew H., Kosowsky, Arthur, Mihaylov, Deyan P., Pereira, Thiago S., Samandar, Amirhossein, Tamosiunas, Andrius
Cosmic microwave background (CMB) temperature and polarization observations indicate that in the best-fit $\Lambda$ Cold Dark Matter model of the Universe, the local geometry is consistent with at most a small amount of positive or negative curvature
Externí odkaz:
http://arxiv.org/abs/2409.02226
Autor:
Samandar, Amirhossein, Duque, Javier Carrón, Copi, Craig J., Barandiaran, Mikel Martin, Mihaylov, Deyan P., Pereira, Thiago S., Starkman, Glenn D., Akrami, Yashar, Anselmi, Stefano, Cornet-Gomez, Fernando, Eskilt, Johannes R., Jaffe, Andrew H., Kosowsky, Arthur, Tamosiunas, Andrius
Publikováno v:
JCAP 11 (2024) 020
The standard cosmological model, which assumes statistical isotropy and parity invariance, predicts the absence of correlations between even-parity and odd-parity observables of the cosmic microwave background (CMB). Contrary to these predictions, la
Externí odkaz:
http://arxiv.org/abs/2407.09400
Publikováno v:
Symmetry 16, 881 (2024)
Since the development of Brans-Dicke gravity, it has become well-known that a conformal transformation of the metric can reformulate this theory, transferring the coupling of the scalar field from the Ricci scalar to the matter sector. Specifically,
Externí odkaz:
http://arxiv.org/abs/2407.08320
Autor:
Rojas, Onofre, de Souza, S. M., Torrico, J., Verissimo, L. M., Pereira, M. S. S., Lyra, M. L., Derzhko, Oleg
Publikováno v:
Phys. Rev. E 110, 024130 (2024)
Recently, a kind of finite-temperature pseudo-transition was observed in several quasi-one-dimensional models. In this work, we consider a genuine one-dimensional extended Hubbard model in the atomic limit, influenced by an external magnetic field an
Externí odkaz:
http://arxiv.org/abs/2406.01344
We consider constrained-degree percolation model on the hypercubic lattice \linebreak $\mathbb{L}^d=(\mathbb{Z}^d,\mathbb{E}^d)$. In this model, there exits a sequence $(U_e)_{e\in\mathbb{E}^d}$ of i.i.d. random variables with distribution $Unif([0,1
Externí odkaz:
http://arxiv.org/abs/2405.09343
Autor:
Tamosiunas, Andrius, Cornet-Gomez, Fernando, Akrami, Yashar, Anselmi, Stefano, Duque, Javier Carrón, Copi, Craig J., Eskilt, Johannes R., Güngör, Özenç, Jaffe, Andrew H., Kosowsky, Arthur, Barandiaran, Mikel Martin, Mertens, James B., Mihaylov, Deyan P., Pereira, Thiago S., Saha, Samanta, Samandar, Amirhossein, Starkman, Glenn D., Taylor, Quinn, Vardanyan, Valeri
Publikováno v:
JCAP 09 (2024) 057
Non-trivial spatial topology of the Universe may give rise to potentially measurable signatures in the cosmic microwave background. We explore different machine learning approaches to classify harmonic-space realizations of the microwave background i
Externí odkaz:
http://arxiv.org/abs/2404.01236