Zobrazeno 1 - 10
of 11
pro vyhledávání: '"Georgios Valogiannis"'
Autor:
Georgios Valogiannis, Cora Dvorkin
Publikováno v:
Physical Review D. 105
Optimal extraction of the non-Gaussian information encoded in the Large-Scale Structure (LSS) of the universe lies at the forefront of modern precision cosmology. We propose achieving this task through the use of the Wavelet Scattering Transform (WST
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::25980ab4d9c62da07e0bfc779a337687
https://doi.org/10.1103/physrevd.105.103534
https://doi.org/10.1103/physrevd.105.103534
Autor:
Georgios Valogiannis, Cora Dvorkin
We perform the first application of the wavelet scattering transform (WST) to actual galaxy observations, through a WST analysis of the BOSS DR12 CMASS dataset. We included the effects of redshift-space anisotropy, non-trivial survey geometry, system
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::74fdf5470d8b7d237a1f886d58c04111
http://arxiv.org/abs/2204.13717
http://arxiv.org/abs/2204.13717
Publikováno v:
Physical Review D. 104
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0d6a6398a5f64ceed544e83322da5eed
https://doi.org/10.1103/physrevd.104.103519
https://doi.org/10.1103/physrevd.104.103519
Autor:
Georgios Valogiannis, Nesar Ramachandra, Peter L. Taylor, Jason Rhodes, Leah Vazsonyi, Agnès Ferté
Publikováno v:
Physical Review D. 104
Using Subaru Hyper Suprime-Cam (HSC) year 1 data, we perform the first $k$-cut cosmic shear analysis constraining both $\Lambda$CDM and $f(R)$ Hu-Sawicki modified gravity. To generate the $f(R)$ cosmic shear theory vector, we use the matter power spe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2c33bbd6f3916a5cdf70e1d220296c46
https://doi.org/10.1103/physrevd.104.083527
https://doi.org/10.1103/physrevd.104.083527
Publikováno v:
Physical Review D. 103
Testing a subset of viable cosmological models beyond general relativity, with implications for cosmic acceleration and the dark energy associated with it, is within the reach of Rubin Observatory Legacy Survey of Space and Time (LSST) and a part of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7cd25a8fb5760ba34eca0fd9638b324f
https://doi.org/10.1103/physrevd.103.123525
https://doi.org/10.1103/physrevd.103.123525
Autor:
Jorge L. Cervantes-Cota, Alejandro Aviles, Mario A. Rodriguez-Meza, Georgios Valogiannis, Baojiu Li, Rachel Bean
Publikováno v:
Journal of Cosmology and Astroparticle Physics
Journal of Cosmology and Astroparticle Physics, 2021, Vol.2021(04), pp.039 [Peer Reviewed Journal]
Journal of Cosmology and Astroparticle Physics, 2021, Vol.2021(04), pp.039 [Peer Reviewed Journal]
We develop a framework to compute the redshift space power spectrum (PS), with kernels beyond Einstein-de Sitter (EdS), that can be applied to a wide variety of generalized cosmologies. We build upon a formalism that was recently employed for standar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::41c6b91c971f233f06d05090b5703928
http://arxiv.org/abs/2012.05077
http://arxiv.org/abs/2012.05077
Autor:
Georgios Valogiannis, Rachel Bean
We compare analytic predictions for real and Fourier space two-point statistics for biased tracers from a variety of Lagrangian Perturbation Theory approaches against those from state of the art N-body simulations in $f(R)$ Hu-Sawicki and the nDGP br
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::80261a92b7ed7e26e4c3672b6f170b75
An accurate perturbative approach to redshift space clustering of biased tracers in modified gravity
We extend the scale-dependent Gaussian Streaming Model (GSM) to produce analytical predictions for the anisotropic redshift-space correlation function for biased tracers in modified gravity models. Employing the Convolution Lagrangian Perturbation Th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a615fa9758a893f907b6dbf705ac37a3
Autor:
Georgios Valogiannis, Rachel Bean
Models that seek to explain cosmic acceleration through modifications to General Relativity (GR) evade stringent Solar System constraints through a restoring, screening mechanism. Down-weighting the high density, screened regions in favor of the low
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::28530f87aa9d6854142dd344f698e92d
Autor:
Georgios Valogiannis, Rachel Bean
We implement an adaptation of the COLA approach, a hybrid scheme that combines Lagrangian perturbation theory with an N-body approach, to model non-linear collapse in chameleon and symmetron modified gravity models. Gravitational screening is modeled
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a4b4137a8018689685483c2f37b7853a