Zobrazeno 1 - 10
of 595
pro vyhledávání: '"Sheth, Ravi K"'
Autor:
Paranjape, Aseem, Sheth, Ravi K.
We consider approximating the linearly evolved 2-point correlation function (2pcf) of dark matter $\xi_{\rm lin}(r;\boldsymbol{\theta})$ in a cosmological model with parameters $\boldsymbol{\theta}$ as the linear combination $\xi_{\rm lin}(r;\boldsym
Externí odkaz:
http://arxiv.org/abs/2410.21374
Autor:
Musso, Marcello, Sheth, Ravi K.
Dark matter haloes form from the collapse of matter around special positions in the initial field, those where the local matter flows converge to a point. For such a triaxial collapse to take place, the energy shear tensor -- the source of the evolut
Externí odkaz:
http://arxiv.org/abs/2410.06289
The location of the baryon acoustic oscillation (BAO) feature in the two-point correlation function (2PCF) of matter produces a standard ruler that is useful for the measurement of the expansion history of the Universe. Inspired by the possibility of
Externí odkaz:
http://arxiv.org/abs/2408.00072
The Baryon Acoustic Oscillation (BAO) feature in the two-point correlation function (TPCF) of discrete tracers such as galaxies is an accurate standard ruler. The covariance matrix of the TPCF plays an important role in determining how the precision
Externí odkaz:
http://arxiv.org/abs/2407.04692
Baryon Acoustic Oscillations (BAOs) are crucial in cosmological analysis, providing a standard ruler, as well as constraints on dark energy. In General Relativity models, the BAO Linear Point - the midpoint between the dip and the peak in the correla
Externí odkaz:
http://arxiv.org/abs/2406.09379
Publikováno v:
A&A 690, A214 (2024)
As it collapses to form a halo, the shape of a protohalo patch is deformed by the initial shear field. This deformation is often modeled using the "deformation" tensor, constructed from second derivatives of the gravitational potential, whose trace g
Externí odkaz:
http://arxiv.org/abs/2405.20207
We demonstrate the effectiveness of one of the many multi-tracer analyses enabled by Optimal Transport (OT) reconstruction. Leveraging a semi-discrete OT algorithm, we determine the displacements between initial and observed positions of biased trace
Externí odkaz:
http://arxiv.org/abs/2403.11951
The statistics of primordial black holes in a radiation dominated Universe -- recent and new results
Autor:
Germani, Cristiano, Sheth, Ravi K.
We review the non-linear statistics of Primordial Black Holes that form from the collapse of over-densities in a radiation dominated Universe. We focus on the scenario in which large over-densities are generated by rare and Gaussian curvature perturb
Externí odkaz:
http://arxiv.org/abs/2308.02971
Recent research has emphasized the benefits of accurately reconstructing the initial Lagrangian positions of biased tracers from their positions at a later time, to gain cosmological information. A weighted semi-discrete optimal transport algorithm c
Externí odkaz:
http://arxiv.org/abs/2307.03671
Autor:
Baxter, Eric, Chang, Chihway, Jain, Bhuvnesh, Adhikari, Susmita, Dalal, Neal, Kravtsov, Andrey, More, Surhud, Rozo, Eduardo, Rykoff, Eli, Sheth, Ravi K.
Analytical models and simulations predict a rapid decline in the halo density profile associated with the transition from the "infalling" regime outside the halo to the "collapsed" regime within the halo. Using data from SDSS, we explore evidence for
Externí odkaz:
http://hdl.handle.net/10150/624484
http://arizona.openrepository.com/arizona/handle/10150/624484
http://arizona.openrepository.com/arizona/handle/10150/624484