搜索结果: 1-15 共查到“天文学 bang”相关记录15条 . 查询时间(0.046 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...
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...
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 ...
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...
Big Bang Nucleosynthesis as a Probe of New Physics
Big bang nucleosynthesis early Universe abundances of light elements ex-tensions of the Standard Model dark matter
2010/11/16
Big bang nucleosynthesis (BBN), an epoch of primordial nuclear transforma-tions in the expanding Universe, has left an observable imprint in the abundances of light elements. Precision observations of...
Electron screening and its effects on Big-Bang nucleosynthesis
Cosmology and Extragalactic Astrophysics (astro-ph.CO) High Energy Physics - Phenomenology (hep-ph) Nuclear Theory (nucl-th)
2010/12/27
We study the effects of electron screening on nuclear reaction rates occurring during the Big Bang nucleosynthesis epoch. The sensitivity of the predicted elemental abundances on electron screening is...
A step closer to Big Bang conditions?（图）
Big Bang conditions the Large Hadron Collider High Energy Physics
2010/10/13
Since December, the Large Hadron Collider (LHC) has been smashing particles together at record-setting energy levels. Physicists hope that those high-energy collisions could replicate the conditions s...
Quantum Cosmology Close to the Classical Big Bang Singularity and in the Semiclassical Limit
Quantum Cosmology Semiclassical Limit Big Bang Singularity
2010/3/18
We investigate a cosmological model whose energy content is described by a Chaplygin gas represented by a scalar field $\phi$ with an associated potential producing a big bang singularity such that fo...
Using Big Bang Nucleosynthesis to Extend CMB Probes of Neutrino Physics
neutrino masses from cosmology big bang nucleosynthesis cosmological parameters from CMBR
2010/3/22
We present calculations showing that upcoming Cosmic Microwave Background (CMB) experiments will have the power to improve on current constraints on neutrino masses and provide new limits on neutrino ...
局爆宇宙学（Local Bang）是与大爆炸宇宙学（Big Bang）相对立的学说。我们认为宇宙是无限的，在时间和空间上没有起点。局爆宇宙学假定，星系团内的致密暗物质在碰撞时或者致密暗星体在晚年时会发生爆炸，即宇宙中的局部性爆炸（Local Bang）。我们接受与宇宙学相关的所有实验观察事实，包括河外星系光谱线的红移, 3K微波背景辐射等。我们采用局爆宇宙学的理论来解释这些观察事实。 我们认为伽玛...
Neutron diffusion and nucleosynthesis in an inhomogeneous big bang model
Neutron diffusion big bang model
2009/6/8
Neutron diffusion and nucleosynthesis in an inhomogeneous big bang model。