Astronomy & Astrophysics; Physics Archivos - Instituto De Física Fundamental

Theoretical priors in scalar-tensor cosmologies: Shift-symmetric Horndeski models

Marcelo Castellanos2022-04-05T17:40:55+02:00Tags: Astronomy & Astrophysics; Physics, Particles & Fields. |

Authors: Traykova, Dina; Bellini, Emilio; Ferreira, Pedro G.; Garcia-Garcia, Carlos; Noller, Johannes; Zumalacarregui, Miguel Journal: PHYSICAL REVIEW D Publication date: 2021/10/01 DOI: 10.1103/PhysRevD.104.083502 Abstract: Attempts at constraining theories of late time accelerated expansion often assume broad priors for the parameters in their phenomenological description. Focusing on shift-symmetric scalar-tensor theories with standard gravitational wave speed, we [...]

Cosmic shear power spectra in practice

Marcelo Castellanos2022-04-04T17:53:00+02:00Tags: Astronomy & Astrophysics; Physics, Particles & Fields. |

Authors: Nicola, Andrina; Garcia-Garcia, Carlos; Alonso, David; Dunkley, Jo; Ferreira, Pedro G.; Slosar, Anze; Spergel, David N. Journal: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS Publication date: 2021/03/01 DOI: 10.1088/1475-7516/2021/03/067 Abstract: Cosmic shear is one of the most powerful probes of Dark Energy, targeted by several current and future galaxy surveys. Lensing shear, however, is only [...]

The growth of density perturbations in the last similar to 10 billion years from tomographic large-scale structure data

Marcelo Castellanos2021-10-01T20:21:00+02:00Tags: Astronomy & Astrophysics; Physics, Particles & Fields. |

Authors: Garcia-Garcia, Carlos; Ruiz-Zapatero, Jaime; Alonso, David; Bellini, Emilio; Ferreira, Pedro G.; Mueller, Eva-Maria; Nicola, Andrina; Ruiz-Lapuente, Pilar Journal: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS Publication date: 2021/10/01 DOI: 10.1088/1475-7516/2021/10/030 Abstract: In order to investigate the origin of the ongoing tension between the amplitude of matter fluctuations measured by weak lensing experiments at low redshifts [...]

Cosmic shear power spectra in practice

Marcelo Castellanos2021-03-01T20:21:00+01:00Tags: Astronomy & Astrophysics; Physics, Particles & Fields. |

Authors: Nicola, Andrina; Garcia-Garcia, Carlos; Alonso, David; Dunkley, Jo; Ferreira, Pedro G.; Slosar, Anze; Spergel, David N. Journal: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS Publication date: 2021/03/01 DOI: 10.1088/1475-7516/2021/03/067 Abstract: Cosmic shear is one of the most powerful probes of Dark Energy, targeted by several current and future galaxy surveys. Lensing shear, however, is only [...]

Theoretical priors in scalar-tensor cosmologies: Thawing quintessence

Marcelo Castellanos2021-02-12T10:08:12+01:00Tags: Astronomy & Astrophysics; Physics, Particles & Fields. |

Authors: Garcia-Garcia, Carlos; Bellini, Emilio; Ferreira, Pedro G.; Traykova, Dina; Zumalacarregui, Miguel Contribution: Article Journal: PHYSICAL REVIEW D Publication date: 2020/03/05 DOI: 10.1103/PhysRevD.101.063508 Abstract: The late time acceleration of the Universe can be characterized in terms of an extra, time-dependent, component of the Universe-dark energy. The simplest proposal for dark energy is a scalar-tensor theory-quintessence-which consists [...]

Entangling Superconducting Qubits through an Analogue Wormhole

Marcelo Castellanos2021-02-12T10:07:58+01:00Tags: Astronomy & Astrophysics; Physics, Particles & Fields. |

Authors: Sabin, Carlos Contribution: Article Journal: UNIVERSE Publication date: 2020/09/09 DOI: 10.3390/universe6090149 Abstract: We propose an experimental setup to test the effect of curved spacetime upon the extraction of entanglement from the quantum field vacuum to a pair of two-level systems. We consider two superconducting qubits coupled to a dc-SQUID array embedded into an open microwave [...]

Quantum dissipation of planar harmonic systems: Maxwell-Chern-Simons theory

Marcelo Castellanos2020-01-16T12:54:29+01:00Tags: Astronomy & Astrophysics; Physics, Particles & Fields. |

Authors: Valido, Antonio A. Contribution: Article Journal: PHYSICAL REVIEW D Publication date: 2019/01/03 DOI: 10.1103/PhysRevD.99.016003 Abstract: Conventional Brownian motion in harmonic systems has provided a deep understanding of a great diversity of dissipative phenomena. We address a rather fundamental microscopic description for the (linear) dissipative dynamics of two-dimensional harmonic oscillators that contains the conventional Brownian motion [...]

Dirac equation in exotic spacetimes

Marcelo Castellanos2020-01-16T12:54:28+01:00Tags: Astronomy & Astrophysics; Physics, Particles & Fields. |

Authors: Faba Garcia, Javier; Sabin, Carlos Contribution: Article Journal: PHYSICAL REVIEW D Publication date: 2019/01/14 DOI: 10.1103/PhysRevD.99.025008 Abstract: We find solutions of the Dirac equation in curved spacetime. In particular, we consider 1 + 1 dimensional sections of several exotic metrics: the Alcubierre metric, which describes a scenario that allows faster-than-light velocity; the Godel metric, which [...]

Neutrino physics with the PTOLEMY project: active neutrino properties and the light sterile case

Marcelo Castellanos2020-01-16T12:54:21+01:00Tags: Astronomy & Astrophysics; Physics, Particles & Fields. |

Authors: Betti, M. G.; Biasotti, M.; Bosca, A.; Calle, F.; Canci, N.; Cavoto, G.; Chang, C.; Cocco, A. G.; Colijn, A. P.; Conrad, J.; D'Ambrosio, N.; De Groot, N.; de Salas, P. F.; Faverzani, M.; Ferella, A.; Ferri, E.; Garcia-Abia, P.; Garcia-Cortes, I; Garcia Gomez-Tejedor, G.; Gariazzo, S.; Gatti, F.; Gentile, C.; Giachero, A.; Gudmundsson, [...]

alpha-attractor dark energy in view of next-generation cosmological surveys

Marcelo Castellanos2020-01-16T12:54:21+01:00Tags: Astronomy & Astrophysics; Physics, Particles & Fields. |

Authors: Garcia-Garcia, Carlos; Ruiz-Lapuente, Pilar; Alonso, David; Zumalacarregui, M. Contribution: Article Journal: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS Publication date: 2019/07/01 DOI: 10.1088/1475-7516/2019/07/025 Abstract: The alpha-attractor inflationary models are nowadays favored by CMB Planck observations. Their similarity with canonical quintessence models motivates the exploration of a common framework that explains both inflation and dark energy. We [...]