搜索结果: 1-15 共查到“理学 bang”相关记录27条 . 查询时间(0.069 秒)
The Big Bang at 75（图）
Physics Philosophy 天体物理学
2023/6/29
There was a time before time when the universe was tiny, dense, and hot. In this world, time didn’t even exist. Space didn’t exist. That’s what current theories about the Big Bang posit, says Vijay Ba...
A 'bang' in LIGO and Virgo detectors signals most massive gravitational wave source yet（图）
bang LIGO Virgo detectors signals massive gravitational source yet
2020/9/4
For all its vast emptiness, the universe is humming with activity in the form of gravitational waves. Produced by extreme astrophysical phenomena, these reverberations ripple forth and shake the fabri...
Small blue galaxy could shed new light on Big Bang,IU astronomers say
Small blue galaxy Big Bang,IU astronomers
2016/5/19
A faint blue galaxy about 30 million light-years from Earth and located in the constellation Leo Minor could shed new light on conditions at the birth of the universe.Astronomers at Indiana University...
International Team Maps "Big Bang" of Bird Evolution（图）
International Team Maps Big Bang Bird Evolution
2014/12/30
The genomes of modern birds tell a story of how they emerged and evolved after the mass extinction that wiped out dinosaurs and almost everything else 66 million years ago. That story is now coming to...
'Big bang' of bird evolution mapped by international research team（图）
Big bang bird evolution mapped international research team
2014/12/30
The genomes of modern birds tell a story: Today's winged rulers of the skies emerged and evolved after the mass extinction that wiped out dinosaurs and almost everything else 66 million years ago.That...
Airfoil Roll Control by Bang-Bang Optimal Control Method with Plasma Actuators
Airfoil Roll Control Bang-Bang Optimal Control Method Plasma Actuators Plasma Physics
2012/4/20
The bang-bang optimal control method was proposed for glow discharge plasma actuators, taking account of practical issues, such as limited actuation states with instantaneously varied aerodynamic cont...
Pre-big bang collapsing universe from modern Kaluza-Klein theory of gravity
Pre-big bang collapsing universe modern Kaluza-Klein theory gravity
2011/10/18
We study the collapse of the universe described by a scalar field spherically symmetric collapse of a system described by a massless scalar field from a 5D Riemann-flat canonical metric, on which we m...
The initial spectrum of fluctuations in the little bang
little bang fluctuations initial spectrum
2011/7/20
High parton densities in ultra-relativistic nuclear collisions suggest a description of these collisions wherein the high energy nuclear wavefunctions and the initial stages of the nuclear collision a...
Standard Big-Bang Nucleosynthesis up to CNO with an improved extended nuclear network
Big-Bang Nucleosynthesis improved extended nuclear network
2011/9/28
Primordial or Big Bang nucleosynthesis (BBN) is one of the three strong evidences for the Big- Bang model together with the expansion of the Universe and the Cosmic Microwave Background radiation. In ...
Conditions quadratiques pour des extrémales bang-singulières
Optimal control second order conditions control constraints singular arc bang-singular solutions
2011/8/22
Abstract: This paper deals with optimal control problems for systems affine in the control variable. We have nonnegativity constraints on the control, and finitely many equality and inequality constra...
Dark Radiation Emerging After Big Bang Nucleosynthesis?
Dark Radiation Emerging Big Bang Nucleosynthesis
2010/12/27
We show how recent data from observations of the cosmic microwave background may suggest the presence of additional radiation density which appeared after big bang nucleosynthesis. We propose a gener...
High-energy break-up of 6Li as a tool to study the Big-Bang nucleosynthesis reaction 2H(alpha,gamma)6Li
High-energy break-up 6Li tool study the Big-Bang nucleosynthesis reaction 2H(alpha,gamma)6Li
2010/12/31
The recently claimed observations of non-negligible amounts of 6Li in old halo stars have renewed interest in the Big-Bang Nucleosynthesis (BBN) of 6Li. One important ingredient in the predicted BBN a...
Circular patterns within the cosmic microwave background suggest that space and time did not come into being at the Big Bang but that our universe in fact continually cycles through a series of "aeons...
Dark Radiation Emerging After Big Bang Nucleosynthesis?
Cosmology BBN CMB Equation of state
2010/11/16
We show how recent data from observations of the cosmic microwave back-ground may suggest the presence of additional radiation density which appeared after big bang nucleosynthesis. We propose a gener...
A refined constrain on lepton number from Big Bang Nucleosynthesis
Neutrinos physics of the early universe primordial asymmetries
2010/11/10
We study the evolution of primordial neutrino{antineutrino asymmetries in the early universe, before and during Big Bang Nucleosynthesis (BBN). We consider quite a wide range for the total lepton numb...