Publications de Zheng Zheng | EPFL Graph Search

Ghost States Underlying Spatial and Temporal Patterns: How Nonexistent Invariant Solutions Control Nonlinear Dynamics

Tobias Schneider, Omid Ashtari, Pierre Beck, Jeremy Peter Parker, Zheng Zheng

Close to a saddle-node bifurcation, when two invariant solutions collide and disappear, the behavior of a dynamical system can closely resemble that of a solution which is no longer present at the chosen parameter value. For bifurcating equilibria in low-d ...

AMER PHYSICAL SOC2025

Pattern formation in transitional turbulent thermal convection: invariant solutions and their bifurcation structures

Zheng Zheng

Pattern formation is ubiquitous in nature and is often governed by complex interactions across a multitude of disciplines. Understanding the origin and the underlying mechanisms of many of these natural patterns remains challenging. Similar patterns also e ...

EPFL2025

Validation of the Scientific Program for the Dark Energy Spectroscopic Instrument

Eduardo Sanchez, Zhifeng Ding, Sun Hee Kim, Hua Zhang, Stewart Cole, Jiangyan Yang, Jean-Paul Richard Kneib, Anand Stéphane Raichoor, Andrei Variu, Ting Tan, Daniel Felipe Forero Sanchez, Cheng Zhao, Arjun Dey, David Schlegel, Zheng Zheng, Xin Chen

The Dark Energy Spectroscopic Instrument (DESI) was designed to conduct a survey covering 14,000 deg(2) over 5 yr to constrain the cosmic expansion history through precise measurements of baryon acoustic oscillations (BAO). The scientific program for DESI ...

Iop Publishing Ltd2024

The DESI one-per cent survey: exploring the halo occupation distribution of luminous red galaxies and quasi-stellar objects with ABACUSSUMMIT

Jiaxi Yu, Hanyu Zhang, Zheng Zheng

We present the first comprehensive halo occupation distribution (HOD) analysis of the Dark Energy Spectroscopic Instrument (DESI) One-Percent Survey luminous red galaxy (LRG) and Quasi Stellar Object (QSO) samples. We constrain the HOD of each sample and t ...

2024

Natural convection in a vertical channel. Part 1. Wavenumber interaction and Eckhaus instability in a narrow domain

Tobias Schneider, Zheng Zheng

In a vertical channel driven by an imposed horizontal temperature gradient, numerical simulations (Gao et al., Phys. Rev. E, vol. 88, 2013, 023010; Phys. Rev. E, vol. 91, 2015, 013006; Phys. Rev. E, vol. 97, 2018, 053107) have previously shown steady, time ...

Cambridge University Press2024

Natural convection in a vertical channel. Part 2. Oblique solutions and global bifurcations in a spanwise-extended domain

Tobias Schneider, Zheng Zheng

Vertical thermal convection is a non-equilibrium system in which both buoyancy and shear forces play a role in driving the convective flow. Beyond the onset of convection, the driven dissipative system exhibits chaotic dynamics and turbulence. In a three-d ...

Cambridge University Press2024

The DESI One-Percent survey: exploring the Halo Occupation Distribution of Emission Line Galaxies with AbacusSummit simulations

Jiaxi Yu, David Schlegel, Hanyu Zhang, Zheng Zheng

The One-Percent survey of the Dark Energy Spectroscopic Instrument collected similar to 270k emission line galaxies (ELGs) at 0.8 < z < 1.6. The high completeness of the sample allowed the clustering to be measured down to scales never probed before, 0.04 ...

Iop Publishing Ltd2023

Performance of the Quasar Spectral Templates for the Dark Energy Spectroscopic Instrument

Jiaxi Yu, Zheng Zheng

Millions of quasar spectra will be collected by the Dark Energy Spectroscopic Instrument (DESI), leading to a fourfold increase in the number of known quasars. High-accuracy quasar classification is essential to tighten constraints on cosmological paramete ...

IOP Publishing Ltd2023

The Seventeenth Data Release of the Sloan Digital Sky Surveys: Complete Release of MaNGA, MaStar, and APOGEE-2 Data

Guillaume Blanc, Johan Comparat, Amy Jones, Jean-Paul Richard Kneib, Yuguang Chen, Cheng Zhao, David Schlegel, Yue Shen, Cheng Li, Zheng Zheng, Kai Zhu

This paper documents the seventeenth data release (DR17) from the Sloan Digital Sky Surveys; the fifth and final release from the fourth phase (SDSS-IV). DR17 contains the complete release of the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) ...

IOP Publishing Ltd2022

Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological implications from two decades of spectroscopic surveys at the Apache Point Observatory

Johan Comparat, Jean-Paul Richard Kneib, Amélie Tamone, Anand Stéphane Raichoor, Andrei Variu, Cheng Zhao, Yuting Wang, Zheng Zheng

We present the cosmological implications from final measurements of clustering using galaxies, quasars, and Ly alpha forests from the completed Sloan Digital Sky Survey (SDSS) lineage of experiments in large-scale structure. These experiments, composed of ...

American Physical Society2021

The Fifteenth Data Release of the Sloan Digital Sky Surveys: First Release of MaNGA-derived Quantities, Data Visualization Tools, and Stellar Library

Guillaume Blanc, Johan Comparat, Amy Jones, Yuguang Chen, Anand Stéphane Raichoor, John Wilson, Meng Yang, David Schlegel, Cheng Li, Zheng Zheng, Jiayi Sun

Twenty years have passed since first light for the Sloan Digital Sky Survey (SDSS). Here, we release data taken by the fourth phase of SDSS (SDSS-IV) across its first three years of operation (2014 July-2017 July). This is the third data release for SDSS-I ...

2019

Evolution of Star-forming Galaxies from z=0.7 to 1.2 with eBOSS Emission-line Galaxies

Johan Comparat, Jean-Paul Richard Kneib, Anand Stéphane Raichoor, Zheng Zheng

We study the evolution of star-forming galaxies with 10(10)M(circle dot) < M-* < 10(11.6)M(circle dot) over the redshift range of 0.7 < z < 1.2 using the emission-line galaxies (ELGs) in the extended Baryon Oscillation Spectroscopic Survey (eBOSS). By appl ...

IOP PUBLISHING LTD2019

The Fourteenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the Extended Baryon Oscillation Spectroscopic Survey and from the Second Phase of the Apache Point Observatory Galactic Evolution Experiment

Guillaume Blanc, Ghazaleh Erfanianfar, Johan Comparat, Amy Jones, Jean-Paul Richard Kneib, Yuguang Chen, Timothée Guy Olivier Delubac, Yu Liang, Anand Stéphane Raichoor, John Wilson, Hongyu Li, Cheng Zhao, Yuting Wang, Meng Yang, David Schlegel, Yue Shen, Cheng Li, Zheng Zheng, Jiayi Sun

2018

Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies, and the Distant Universe

Guillaume Blanc, Johan Comparat, Amy Jones, Jean-Paul Richard Kneib, Timothée Guy Olivier Delubac, Chao Liu, Anand Stéphane Raichoor, John Wilson, Hongyu Li, Yuting Wang, Meng Yang, David Schlegel, Cheng Li, Zheng Zheng, Jiayi Sun

We describe the Sloan Digital Sky Survey IV (SDSS-IV), a project encompassing three major spectroscopic programs. The Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2) is observing hundreds of thousands of Milky Way stars at high resoluti ...

2017

The 13th Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-IV Survey Mapping Nearby Galaxies at Apache Point Observatory

Guillaume Blanc, Johan Comparat, Amy Jones, Pierre Laurent, Jean-Paul Richard Kneib, Yuguang Chen, Timothée Guy Olivier Delubac, Yu Liang, Chao Liu, Anand Stéphane Raichoor, John Wilson, Cheng Zhao, Yuting Wang, Meng Yang, Michael James Henry Smith, David Schlegel, Ginevra Favole, Cheng Li, Zheng Zheng, Yang Gao, Jiayi Sun, Chen Li

The fourth generation of the Sloan Digital Sky Survey (SDSS-IV) began observations in 2014 July. It pursues three core programs: the Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2), Mapping Nearby Galaxies at APO (MaNGA), and the Extend ...

Iop Publishing Ltd2017

The Sdss-Iv Extended Baryon Oscillation Spectroscopic Survey: Overview And Early Data

Johan Comparat, Pierre Laurent, Jean-Paul Richard Kneib, Timothée Guy Olivier Delubac, Yu Liang, Anand Stéphane Raichoor, Cheng Zhao, Yuting Wang, David Schlegel, Cheng Li, Zheng Zheng

In a six-year program started in 2014 July, the Extended Baryon Oscillation Spectroscopic Survey (eBOSS) will conduct novel cosmological observations using the BOSS spectrograph at Apache Point Observatory. These observations will be conducted simultaneous ...

Iop Publishing Ltd2016

The Eleventh And Twelfth Data Releases Of The Sloan Digital Sky Survey: Final Data From Sdss-Iii

Johan Comparat, Pierre Laurent, Jean-Paul Richard Kneib, Yuguang Chen, Timothée Guy Olivier Delubac, Jian Liu, David Schlegel, Yue Shen, Zheng Zheng

The third generation of the Sloan Digital Sky Survey (SDSS-III) took data from 2008 to 2014 using the original SDSS wide-field imager, the original and an upgraded multi-object fiber-fed optical spectrograph, a new near-infrared high-resolution spectrograp ...

Iop Publishing Ltd2015

The Tenth Data Release Of The Sloan Digital Sky Survey: First Spectroscopic Data From The Sdss-Iii Apache Point Observatory Galactic Evolution Experiment

Johan Comparat, Arnaud Borde, Bo Ma, Jean-Paul Richard Kneib, Timothée Guy Olivier Delubac, David Schlegel, Ginevra Favole, Yue Shen, Zheng Zheng

The Sloan Digital Sky Survey (SDSS) has been in operation since 2000 April. This paper presents the Tenth Public Data Release (DR10) from its current incarnation, SDSS-III. This data release includes the first spectroscopic data from the Apache Point Obser ...

Iop Publishing Ltd2014

Search for D0-D¯0 Mixing in D0→K+π- Decays and Measurement of the Doubly-Cabibbo-Suppressed Decay Rate

Aurelio Bay, Olivier Schneider, Sun Hee Kim, Tagir Aushev, Stewart Cole, Chao Wang, Yuan Yuan, Lei Zhang, Ji Hyun Kim, Zheng Zheng, Zhi Zheng, Jing Li

2005