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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...
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...
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 ...
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...
Concentric circles in WMAP data may provide evidence of violent pre-Big-Bang activity
Concentric circles WMAP data provide evidence violent pre-Big-Bang activity
2010/12/21
Conformal cyclic cosmology (CCC) posits the existence of an aeon preceding our Big Bang B, whose conformal infinity I is identified, conformally, with B, now regarded as a spacelike 3-surface.
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...