A5091016967- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Relativity and Gravitational Theory
- Combustion and flame dynamics
- Gamma-ray bursts and supernovae
- Diabetes and associated disorders
- Black Holes and Theoretical Physics
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Chemical Physics Studies
- Liver Disease Diagnosis and Treatment
- Stellar, planetary, and galactic studies
- Diet, Metabolism, and Disease
- Astronomy and Astrophysical Research
- Atmospheric Ozone and Climate
Center for Astrophysics Harvard & Smithsonian
2014-2020
Princeton University
2018
Harvard University
2014-2017
University of Chile
2013-2014
In hierarchical models of structure formation, the first galaxies form in low-mass dark matter potential wells, probing behavior on kiloparsec scales. Even though these objects are below detection threshold current telescopes, future missions will open an observational window into this emergent world. Letter, we investigate how assembled a "fuzzy" (FDM) cosmology where is ultralight ∼10^{-22} eV boson and primordial stars expected to along dense filaments. Using first-of-its-kind...
The Schr\"odinger-Poisson equations describe the behavior of a superfluid Bose-Einstein condensate under self-gravity with 3D wave function. As $\ensuremath{\hbar}/m\ensuremath{\rightarrow}0$, $m$ being boson mass, have been postulated to approximate collisionless Vlasov-Poisson also known as Boltzmann-Poisson equations. latter matter 6D classical distribution We investigate nature this correspondence suite numerical test problems in 1D, 2D, and along analytic treatments when possible....
We present the highest-resolution three-dimensional simulation to date of collapse an atomic cooling halo in early Universe. use moving-mesh code arepo with primordial chemistry module introduced Greif, which evolves chemical and thermal rate equations for over more than 20 orders magnitude density. Molecular hydrogen is suppressed by a strong Lyman–Werner background, facilitates near-isothermal gas at temperature about 104 K. Once central cloud becomes optically thick continuum emission, it...
ABSTRACT Bose–Einstein condensate dark matter (BECDM, also known as fuzzy matter) is motivated by fundamental physics and has recently received significant attention a serious alternative to the established cold (CDM) model. We perform cosmological simulations of BECDM gravitationally coupled baryons investigate structure formation at high redshifts (z ≳ 5) for boson mass m = 2.5 × 10−22 eV, exploring dynamical effects its wavelike nature on cosmic web first galaxies. Our are directly...
We present a suite of six fully cosmological, three-dimensional simulations the collapse an atomic cooling halo in early Universe. use moving-mesh code arepo with improved primordial chemistry network to evolve hydrodynamical and chemical equations. The addition strong Lyman–Werner background suppresses molecular hydrogen permits gas nearly isothermally at temperature about 8000 K. Strong gravitational torques effectively remove angular momentum lead central gas, forming supermassive...
We perform a post-processing radiative feedback analysis on 3D ab initio cosmological simulation of an atomic cooling halo under the direct collapse black hole (DCBH) scenario. maintain spatial resolution by incorporating native ray-tracing unstructured mesh data, including Monte Carlo Lyman-alpha (Ly{\alpha}) transfer. DCBHs are born in gas-rich, metal-poor environments with possibility Compton-thick conditions, $N_H \gtrsim 10^{24} {\rm cm}^{-2}$. Therefore, surrounding gas is capable...
Abstract We present a model for the evolution of supermassive protostars from their formation at <?CDATA ${M}_{\star }\simeq 0.1\,{M}_{\odot }$?> until growth to {10}^{5}\,{M}_{\odot . To calculate initial properties object in optically thick regime, we follow two approaches: one based on idealized thermodynamic considerations, and another more detailed one-zone model. Both methods derive similar value ${n}_{{\rm{F}}}\simeq 2\times {10}^{17}\,{\mathrm{cm}}^{-3}$?> density when opacity...
We study the star formation process at galactic scales and role of rotation through numerical simulations spiral starburst galaxies using adaptive mesh refinement code Enzo. focus on three integrated laws found in literature: Kennicutt–Schmidt (KS) Silk–Elmegreen (SE) laws, dimensionally homogeneous equation proposed by Escala . show that last we take into account effects integration along line sight find a unique regime for both types galaxies, suppressing observed bi-modality KS law....
NAFLD has become the leading cause of chronic liver disease in children, as a direct consequence high prevalence childhood obesity. This study aimed to characterize body composition trajectories from adolescence and their association with risk developing nonalcoholic fatty (NAFLD) during adolescence. The participants were part ‘Chilean Growth Obesity Cohort Study’, comprising 784 children who followed prospectively age 3 years. Annual assessments nutritional status conducted, ultrasound...
We use the adaptive mesh refinement code Enzo to model interstellar medium (ISM) in isolated local disk galaxies. The simulation includes a treatment for star formation and stellar feedback. get highly supersonic turbulent disk, which is fragmented at multiple scales characterized by multi-phase ISM. show that Kennicutt–Schmidt relation only holds when averaging over large scales. However, values of rates gas surface densities lie close plot any size. This suggests an intrinsic between stars...
We study the gravitational stability of gaseous streams in complex environment a galaxy merger, because mergers are known to be places ongoing massive cluster formation and bursts star formation. find an analytic parameter for case orbiting around merger remnant. test our criteria using hydrodynamical simulations mergers, obtaining satisfactory results. that successfully predicts will gravitationally unstable fragment into clumps.