Zobrazeno 1 - 10
of 510
pro vyhledávání: '"Megevand P"'
Autor:
Alcubierre, Miguel, Barranco, Juan, Bernal, Argelia, Degollado, Juan Carlos, Diez-Tejedor, Alberto, Megevand, Miguel, Núñez, Darío, Sarbach, Olivier
We construct gravitational atoms including self-gravity, obtaining solutions of the Einstein-Klein-Gordon equations for a scalar field surrounding a non-rotating black hole in a quasi-stationary approximation. We resolve the region near the horizon a
Externí odkaz:
http://arxiv.org/abs/2411.18601
Publikováno v:
JCAP04(2024)003
We study the dynamics of a cosmological bubble wall beyond the approximation of an infinitely thin wall. In a previous paper, we discussed the range of validity of this approximation and estimated the first-order corrections due to the finite width.
Externí odkaz:
http://arxiv.org/abs/2401.03102
Publikováno v:
JCAP06(2023)007
This is the first in a series of papers where we study the dynamics of a bubble wall beyond usual approximations, such as the assumptions of spherical bubbles and infinitely thin walls. In this paper, we consider a vacuum phase transition. Thus, we d
Externí odkaz:
http://arxiv.org/abs/2302.13349
Autor:
Alcubierre, Miguel, Barranco, Juan, Bernal, Argelia, Degollado, Juan Carlos, Diez-Tejedor, Alberto, Megevand, Miguel, Núñez, Darío, Sarbach, Olivier
We construct boson star configurations in quantum field theory using the semiclassical gravity approximation. Restricting our attention to the static case, we show that the semiclassical Einstein-Klein-Gordon system for a {\it single real quantum} sc
Externí odkaz:
http://arxiv.org/abs/2212.02530
Autor:
Martins, C. J. A. P., Cristiani, S., Cupani, G., D'Odorico, V., Santos, R. Génova, Leite, A. C. O., Marques, C. M. J., Milaković, D., Molaro, P., Murphy, Michael T., Nunes, N. J., Schmidt, Tobias M., Adibekyan, V., Alibert, Y., Di Marcantonio, Paolo, Hernández, J. I. González, Mégevand, D., Palle, E., Pepe, F. A., Santos, N. C., Sousa, S. G., Sozzetti, A., Mascareño, A. Suárez, Osorio, M. R. Zapatero
Dynamical scalar fields in an effective four-dimensional field theory are naturally expected to couple to the rest of the theory's degrees of freedom, unless some new symmetry is postulated to suppress these couplings. In particular, a coupling to th
Externí odkaz:
http://arxiv.org/abs/2205.13848
Autor:
Silva, A. M., Faria, J. P., Santos, N. C., Sousa, S. G., Viana, P. T. P., Martins, J. H. C., Figueira, P., Lovis, C., Pepe, F., Cristiani, S., Rebolo, R., Allart, R., Cabral, A., Mehner, A., Sozzetti, A., Mascareño, A. Suárez, Martins, C. J. A. P., Ehrenreich, D., Mégevand, D., Palle, E., Curto, G. Lo, Tabernero, H. M., Lillo-Box, J., Hernández, J. I. González, Osorio, M. R. Zapatero, Hara, N. C., Nunes, N. J., Di Marcantonio, P., Udry, S., Adibekyan, V., Dumusque, X.
Publikováno v:
A&A 663, A143 (2022)
The detection and characterization of an increasing variety of exoplanets has been in part possible thanks to the continuous development of high-resolution, stable spectrographs, and using the Doppler radial-velocity (RV) method. The Cross Correlatio
Externí odkaz:
http://arxiv.org/abs/2205.00067
Autor:
Bourrier, V., Osorio, M. R. Zapatero, Allart, R., Attia, O., Cretignier, M., Dumusque, X., Lovis, C., Adibekyan, V., Borsa, F., Figueira, P., Hernández, J. I. González, Mehner, A., Santos, N. C., Schmidt, T., Seidel, J. V., Sozzetti, A., Alibert, Y., Casasayas-Barris, N., Ehrenreich, D., Curto, G. Lo, Martins, C. J. A. P., Di Marcantonio, P., Mégevand, D., Nunes, N. J., Palle, E., Poretti, E., Sousa, S. G.
GJ436b might be the prototype of warm Neptunes that have undergone late migration induced by an outer companion. Precise determination of the orbital architecture of such systems is critical to constraining their dynamical history and evaluating the
Externí odkaz:
http://arxiv.org/abs/2203.06109
Autor:
Faria, J. P., Mascareño, A. Suárez, Figueira, P., Silva, A. M., Damasso, M., Demangeon, O., Pepe, F., Santos, N. C., Rebolo, R., Cristiani, S., Adibekyan, V., Alibert, Y., Allart, R., Barros, S. C. C., Cabral, A., D'Odorico, V., Di Marcantonio, P., Dumusque, X., Ehrenreich, D., Hernández, J. I. González, Hara, N., Lillo-Box, J., Curto, G. Lo, Lovis, C., Martins, C. J. A. P., Mégevand, D., Mehner, A., Micela, G., Molaro, P., Nunes, N. J., Pallé, E., Poretti, E., Sousa, S. G., Sozzetti, A., Tabernero, H., Udry, S., Osorio, M. R. Zapatero
Proxima Centauri is the closest star to the Sun. This small, low-mass, mid M dwarf is known to host an Earth-mass exoplanet with an orbital period of 11.2 days within the habitable zone, as well as a long-period planet candidate with an orbital perio
Externí odkaz:
http://arxiv.org/abs/2202.05188
Autor:
Jaramillo, Víctor, Sanchis-Gual, Nicolas, Barranco, Juan, Bernal, Argelia, Degollado, Juan Carlos, Herdeiro, Carlos, Megevand, Miguel, Núñez, Darío
Fully non-linear numerical evolutions of the Einstein-(multi)--Klein-Gordon equations are performed to study head-on collisions of $\ell$-boson stars. Despite being spherically symmetric, $\ell$-boson stars have a (hidden) frame of reference, used in
Externí odkaz:
http://arxiv.org/abs/2202.00696
Autor:
Cristo, E., Santos, N. C., Demangeon, O., Martins, J. H. C., Figueira, P., Casasayas-Barris, N., Osorio, M. R. Zapatero, Borsa, F., Sousa, S. G., Oshagh, M., Micela, G., Tabernero, H. M., Seidel, J. V., Cristiani, S., Pepe, F., Rebolo, R., Adibekyan, V., Allart, R., Alibert, Y., Silva, T. Azevedo, Bourrier, V., Cabral, A., Borges, E. Esparza, Hernández, J. I. González, Lillo-Box, J., Curto, G. Lo, Lovis, C., Manescau, A., Di Marcantonio, P., Martins, C. J. A. P., Mascareño, A. S., Mégevand, D., Mehner, A., Nunes, N. J., Palle, E., Sozzetti, A., Udry, S.
Publikováno v:
A&A 660, A52 (2022)
In this paper we introduce CaRM, a semi-automatic code for the retrieval of broadband transmission spectra of transiting planets through the chromatic Rossiter-McLaughlin method. We applied it to HARPS and ESPRESSO observations of two exoplanets to r
Externí odkaz:
http://arxiv.org/abs/2201.06531