Catalogue Search | MBRL
Are you sure you want to remove the book from the shelf?
{{itemTitle}}
28,669
result(s) for
"Bang "
Sort by:
Quantum singularities in a solvable toy model
Via elementary examples it is demonstrated that the singularities of classical physics (sampled by the Big Bang in cosmology) need not necessarily get smeared out after quantization. It is proposed that the role of quantum singularities can be played by the so called Kato’s exceptional-point spectral degeneracies.
Journal Article
Big bang! : the tongue-tickling tale of a speck that became spectacular
Discusses the big-bang theory of how a tiny speck became the universe we know today.
Book
A cold, massive, rotating disk galaxy 1.5 billion years after the Big Bang
Massive disk galaxies like the Milky Way are expected to form at late times in traditional models of galaxy formation
1
,
2
, but recent numerical simulations suggest that such galaxies could form as early as a billion years after the Big Bang through the accretion of cold material and mergers
3
,
4
. Observationally, it has been difficult to identify disk galaxies in emission at high redshift
5
,
6
in order to discern between competing models of galaxy formation. Here we report imaging, with a resolution of about 1.3 kiloparsecs, of the 158-micrometre emission line from singly ionized carbon, the far-infrared dust continuum and the near-ultraviolet continuum emission from a galaxy at a redshift of 4.2603, identified by detecting its absorption of quasar light. These observations show that the emission arises from gas inside a cold, dusty, rotating disk with a rotational velocity of about 272 kilometres per second. The detection of emission from carbon monoxide in the galaxy yields a molecular mass that is consistent with the estimate from the ionized carbon emission of about 72 billion solar masses. The existence of such a massive, rotationally supported, cold disk galaxy when the Universe was only 1.5 billion years old favours formation through either cold-mode accretion or mergers, although its large rotational velocity and large content of cold gas remain challenging to reproduce with most numerical simulations
7
,
8
.
A massive rotating disk galaxy was formed a mere 1.5 billion years after the Big Bang, a surprisingly short time after the origin of the Universe.
Journal Article
Cosmology and the evolution of the universe
Covers the current scientific understanding of the creation and evolution of the universe.
Book
Explaining the Big Bang
The Big Bang is the cause of every event in our Universe and hence it explains all subsequent cosmic history. But can the Big Bang itself be explained? This paper explores a number of different styles of explanation that might be offered. These include causal explanations of the Big Bang either by a physical or a non-physical cause: here the paper focusses especially on Roger Penrose’s conformal cyclic cosmology. They also include non-causal explanations of the Big Bang in terms of an underlying physical or non-physical fundamental basis for the Universe or in terms of fundamental physical laws.
Journal Article
The amazing unity of the universe : and its origin in the big bang
In the first chapters the author describes how our knowledge of the position of Earth in space and time has developed, thanks to the work of many generations of astronomers and physicists. He discusses how our position in the Galaxy was discovered, and how in 1929, Hubble uncovered the fact that the Universe is expanding, leading to the picture of the Big Bang. He then explains how astronomers have found that the laws of physics that were discovered here on Earth and in the Solar System (the laws of mechanics, gravity, atomic physics, electromagnetism, etc.) are valid throughout the Universe. This is illustrated by the fact that all matter in the Universe consists of atoms of the same chemical elements that we know on Earth. This unity is all the more surprising when one realizes that in the original Big Bang theory, different parts of the Universe could never have communicated with each other.
Book
A CMB search for the neutrino mass mechanism and its relation to the Hubble tension
The majoron, a pseudo-Goldstone boson arising from the spontaneous breaking of global lepton number, is a generic feature of many models intended to explain the origin of the small neutrino masses. In this work, we investigate potential imprints in the cosmic microwave background (CMB) arising from massive majorons, should they thermalize with neutrinos after Big Bang Nucleosynthesis via inverse neutrino decays. We show that Planck2018 measurements of the CMB are currently sensitive to neutrino-majoron couplings as small as
λ
∼
10
-
13
, which if interpreted in the context of the type-I seesaw mechanism correspond to a lepton number symmetry breaking scale
v
L
∼
O
(
100
)
GeV
. Additionally, we identify parameter space for which the majoron-neutrino interactions, collectively with an extra contribution to the effective number of relativistic species
N
eff
, can ameliorate the outstanding
H
0
tension.
Journal Article
The onset of star formation 250 million years after the Big Bang
A fundamental quest of modern astronomy is to locate the earliest galaxies and study how they influenced the intergalactic medium a few hundred million years after the Big Bang
1
–
3
. The abundance of star-forming galaxies is known to decline
4
,
5
from redshifts of about 6 to 10, but a key question is the extent of star formation at even earlier times, corresponding to the period when the first galaxies might have emerged. Here we report spectroscopic observations of MACS1149-JD1
6
, a gravitationally lensed galaxy observed when the Universe was less than four per cent of its present age. We detect an emission line of doubly ionized oxygen at a redshift of 9.1096 ± 0.0006, with an uncertainty of one standard deviation. This precisely determined redshift indicates that the red rest-frame optical colour arises from a dominant stellar component that formed about 250 million years after the Big Bang, corresponding to a redshift of about 15. Our results indicate that it may be possible to detect such early episodes of star formation in similar galaxies with future telescopes.
Observation of the emission line of doubly ionized oxygen at a redshift of 9.1096 reveals that star formation began at a redshift of about 15, around 250 million years after the Big Bang.
Journal Article