inflation

en-noun

inflation (countable and uncountable, plural inflations)

From Middle English, borrowed from Old French inflation (“swelling”), from Latin īnflātiō (“expansion", "blowing up”), from īnflātus, the perfect passive participle of īnflō (“blow into, expand”), from in (“into”) + flō (“blow”). By surface analysis, inflate + -ion.

der

(cosmology) An extremely rapid expansion of the universe, theorized to have occurred very shortly after the Big Bang.


CC

en-noun

CC (countable and uncountable, plural CCs)

cosmological constant
cosmological constant#English

(cosmology) Initialism of cosmological constant.


dark matter

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dark matter
en:Fritz Zwicky
en:Vera Rubin

Calque of German Dunkle Materie, from dunkel (“dark”) and Materie (“matter”). Coined by Swiss astronomer Fritz Zwicky in German in 1933, to account for the apparent mass needed to account for galaxy clusters, where the mass of luminous matter did not add up to enough of a gravitational effect, inferring nonluminous matter must exist to account for the missing mass. The term gained new popularity due to the missing mass found in galaxies to account for galaxy rotation curves discovered by Vera Rubin in research published in English in the 1970s.

(particle physics, cosmology, strictly) Matter which has mass but which does not readily interact with normal matter except through gravitational effects.


geocentric

/ˌdʒiːəʊˈsɛntɹɪk/

(cosmology) Of or relating to geocentrism, an obsolete cosmology which placed the Earth at the center of the universe.


heliocentric

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(cosmology) Of or relating to heliocentrism.


Big Bang

Coined by English astronomer Fred Hoyle on the BBC Third Programme, broadcast at 18:30 GMT on 28 March 1949. It is a popular but misinformed belief that this was intended as a derogatory term, Hoyle being a proponent of the opposing steady state theory, but Hoyle himself has rejected that notion.

On scientific grounds this big bang assumption is much less the palatable of the two.

1955, Fred Hoyle, chapter 6, in The nature of the universe, page 113:

(cosmology) The cosmic event that marks the beginning of time and the rapid expansion of space for the visible universe. The evolution of the universe since that beginning point is described by the Big Bang Theory.


axis of evil

2002 State of the Union Address
George W. Bush
axis of evil

Coined by American political commentator David Frum in 2002 and first used publicly by President George W. Bush in the 2002 State of the Union Address. Possibly from a historical analogy to the German-Italian-Japanese axis. Extended to astrophysics by Portuguese scientist João Magueijo in 2005.

coin

cosmic microwave background
cosmic microwave background

(astrophysics, cosmology) An anomaly in the temperature of the cosmic microwave background as the result of a preferential axis which may have shaped the development of the universe, sometimes abbreviated AOE.


multiverse

First appears c. 1895. Blend of multiple + universe, coined by American philosopher William James. By surface analysis, multi- + -verse.

coined

Meronyms: monoverse, parallel universe

Our universe is a very small part of the multiverse.

And, it must be remembered, that in the great multiverse they were a mere scattering of seeds; seeds that must survive many elements if they were to grow.

1963 May, Michael Moorcock, “The Blood Red Game”, in Science Fiction Adventures, volume 6, number 32, London: Nova Publications:

I have been describing show us that the multiverse exists and that it contains many counterparts of each particle in the tangible universe. To reach the further conclusion that the multiverse is roughly partitioned into parallel universes, we must consider interference phenomena involving more than one tangible particle.

1998 [1997], David Deutsch, The Fabric of Reality, New York: Penguin Books, →ISBN, page 46:

I can’t help feeling that in the closest arm of the multiverse, there is a version of me that is fatter and happier.

2020, Raven Leilani, Luster, Picador, published 2021, page 26:

(physics, cosmology) The hypothetical group of all the possible universes in existence.

كون متعدد

hypothetical group of all possible universes


Inflation

Ages of the Universe
Ages of the Universe#English

(cosmology) The inflationary epoch of the Universe, where the size of the space of universe expanded at speeds beyond the speed of light. One of the Ages of the Universe. The cosmic era when most formulations of Big Bang theory start their timelines.


PAP

participatory anthropic principle
w:participatory anthropic principle

(cosmology, epistemology) Initialism of participatory anthropic principle.


relic

From Middle English relik et al., from Old French relique, from Latin reliquiae (“remains, relics”), from relinquō (“I leave behind, abandon, relinquish”), from re- + linquō (“I leave, quit, forsake, depart from”).

One of the primary targets of current and especially future cosmological observations are light thermal relics of the hot big bang.

2019, Wallisch, Benjamin, “Abstract”, in Cosmological Probes of Light Relics, page ix:

(cosmology) A particle or entity that has existed since the Big Bang.


Big Crunch

(cosmology) The hypothetical eventual collapse of the universe that would ultimately occur if it contracted continuously in the future.

velký krach

hypothetic eventual collapse of the universe


heat death of the universe

the heat death of the universe (canonical)

thermodynamic equilibrium
thermodynamic equilibrium

(cosmology, thermodynamics) A theoretical future state of the universe in which the universe attains thermodynamic equilibrium and a further increase of entropy is no longer possible.


Big Rip

(cosmology) A hypothetical end of the universe in which its rate of expansion becomes infinite in finite time, resulting in all matter being torn apart.


eternal return

(cosmology, religion, philosophy) Eternal recurrence.


eternal recurrence

The concept dates from ancient times and was popularized by the philosopher Nietzsche (1844-1900).

(cosmology, religion, philosophy) The belief or theory that all the events in cosmic history repeat in an endless cycle.


decoupling

[diːˈkʊpəlɪŋɡ]

Directly combining in a low energy state (ground state) is less efficient, so these hydrogen atoms generally form with the electrons still in a high-energy state, and once combined, the electrons quickly release energy in the form of one or more photons as they transition to a low energy state. This release of photons is known as photon decoupling.

2023 July 13, Wikipedia contributors, “Chronology of the universe”, in English Wikipedia, Wikimedia Foundation:

(cosmology) The emission of photons during Recombination.


baryogenesis

(cosmology) The generation of baryonic matter in the early moments of the Big Bang.


superinflation

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(cosmology) A proposed inflation of spacetime in the early universe driven by the kinetic energy of the dilaton


alternate universe

en-noun

alternate universe (plural alternate universes)

The first credible suggestion that alternate universes might exist came in the early 1950s when a young physics graduate student named Hugh Everett was toying with some of the more bizarre implications of quantum mechanics.

2000 April 10, Michael D. Lemonick, “Will We Discover Another Universe?”, in Time:

(physics, cosmology) A hypothetical world situated in a different dimension of space and time than the real world consisting of the universe known and experienced by human beings.


doomsday event

The universe will contract and grow hotter until the doomsday event that astronomers have dubbed "the big crunch."

1995 April 7, Malcolm W. Browne, “A Research Team Detects Many More Galaxies”, in New York Times, retrieved 2008-07-05:

In this subsection we face the question about the possibility of evading the doomsday event in phantom models of dark energy with interaction, which are inspired in scalar-tensor theories of gravity.

2006, Ruben Curbelo et al., “Interacting phantom energy and avoidance of the big rip singularity”, in Classical and Quantum Gravity, volume 23, number 5, page 1591:

Sceptics claim switching on the supercooled magnets could create a doomsday event that would destroy the Earth.

2008 July 2, “World to end in August (maybe)”, in New Zealand Herald, retrieved 2008-07-05:

(cosmology, astronomy) An occurrence which causes the end of the universe or which destroys the planet earth; a global cataclysm.


parallel universe

parallel universe (plural parallel universes)

non-parallelizable universe

mathematically incompatible; without a common superordinate wave function

Subjectively we perceive this as a single, unpredictable or ‘random’ outcome, though from the multiverse point of view all the outcomes have actually happened. This parallel-universe multiplicity is the real reason for the unpredictability of the weather.

1998 [1997], David Deutsch, The Fabric of Reality, New York: Penguin Books, →ISBN, page 202:

(sciences, science fiction, cosmology) A universe that exists separately alongside another universe, as part of a multiverse.


sublunary sphere

sublunary sphere (plural sublunary spheres)

(cosmology) In geocentric cosmologies, that region of the cosmos from the centre of the Earth to the moon, believed to comprise the four classical elements (earth, air, fire and water) and to be subject to generation and corruption.


ylem

Resuscitation of Middle English ylem, from Medieval Latin hȳlem, accusative of hȳlē (“matter, the fundamental matter of all things; the matter of the body”) (whence English hyle), a transliteration of Ancient Greek ὕλη (húlē, “wood; material, substance; matter”). The concept of “fundamental matter” – Ancient Greek πρώτη ὕλη (prṓtē húlē) – was propounded by the Greek philosopher Aristotle (384–322 B.C.E.).
The term ylem was first used in modern English in the paper “The Origin of Chemical Elements”, coauthored by Russian-American theoretical physicist and cosmologist George Gamow (1904–1968), American cosmologist Ralph Asher Alpher (1921–2007) and German-American nuclear physicist Hans Bethe (1906–2005), published 1 April 1948 in Physical Review. Alpher claimed to have found the word “in a large dictionary”, perhaps Webster’s New International Dictionary (2nd ed., 1934), which he referred to in a second 1948 paper (cited below). In a 1968 interview, Gamow also associated ylem with a Hebrew word he did not name; it remains unclear which word he was referring to.
The word ylem reappeared in popular books on science following the discovery in 1964–1965 of the cosmic microwave background, which had been predicted in 1948 by Alpher and Robert Herman (1914–1997), and again after the publication of images of the radiation composed from measurements by two satellites, the Cosmic Background Explorer (COBE) in 1992 and the Wilkinson Microwave Anisotropy Probe (WMAP) in 2003.

der

Very shortly after the beginning of the universal expansion, the ylem was a gas of neutrons only. [Footnote: According to Webster's New International Dictionary, 2nd Ed., the word ‘ylem’ is an obsolete noun meaning ‘The primordial substance from which the elements were formed.’ It seems highly desirable that a word of so appropriate a meaning be resurrected.]

1948 December 1, R[alph] A[sher] Alpher, “A Neutron-capture Theory of the Formation and Relative Abundance of the Elements”, in Physical Review, volume 74, number 11, College Park, Md.: American Physical Society, →DOI, →OCLC, page 1581, column 1:

Let us now consider the state of matter during the first minutes of the expansion process, when the temperature of the universe was many billions of degrees high. […] [T]he state of matter must be visualized as a hot gas formed entirely by nuclear particles; that is, protons, neutrons, and electrons. […] We will call this primordial mixture of nuclear particles "Ylem," [footnote: Pronounced: ī′lěm] reviving an obsolete noun which, according to Webster's Dictionary, means "the first substance from which the elements were supposed to be formed." Next we can ask what happened to the Ylem when its density and temperature began to drop as the result of the rapid expansion taking place in the young universe.

1952, George Gamow, The Creation of the Universe, New York, N.Y.: Viking Press, OCLC 999160; republished as New York, N.Y.: Viking Press, 1961, 2nd edition, OCLC 642243549, page 53

The ylem was the primordial flux of neutrons out of which all else emerged.

1959, James Blish, chapter 7, in A Clash of Cymbals [US title: The Triumph of Time] (Cities in Flight; 4), London: Faber and Faber, →ISBN, page 171:

He [George Gamow] surmised that that the universe began as a super-condensed raging inferno of protons, neutrons and electrons, which he and his colleagues called the ylem […] The internal pressures of the ylem caused it to expand outward extremely rapidly. After a few minutes the ylem cooled down sufficiently to allow the strong force to bind neutrons and protons together into deuterium nuclei. […] Then there was just enough time for some of the deuterium to fuse into helium before temperatures and pressures of the ylem became too diffuse to allow more fusions.

2008, Piers Bizony, “Part Eight, Ylem”, in Atom, Thriplow, Cambridgeshire: Icon, →ISBN, page 171:

(cosmology, now chiefly historical) In the Big Bang theory, the hot and dense plasma that made up the matter in the cosmos following the initial baryogenesis at an early stage of its expansion and cooling, from which the first atoms formed and photons decoupled. The emission of photons in this phase is regarded as the source of the cosmic microwave background.

National Aeronautics and Space Administration


galactocentric

(cosmology) Of or relating to galactocentrism, the theory according to which the Milky Way is at or near the center of the Universe.


degravitation

(physics, cosmology) The removal of the effects of gravity from a system, or mathematical construct.


blackfold

(cosmology) Any of several proposed submanifolds of a black brane.


quasistar

(astronomy, cosmology) A theoretical early universe object, with the outer layers of a star and a black hole for a stellar core. Theorized to be born of an ultramassive pre-stellar nebula collapse to an ultramassive protostar, and later birthing an intermediate mass black hole when the star's life ends.


gastrophysics

(physics, cosmology) The physics involved in the formation of galaxies.


GWB

gravitational wave background
gravitational wave background#English

(uncountable, astronomy, cosmology, astrophysics) Abbreviation of gravitational wave background.


astrocladistics

(cosmology) The phylogenetic analysis of galaxy evolution.


baryosynthesis

Cosmological theories that account for the baryon-antibaryon asymmetry and relate the neutron electric-dipole moment to the entropy of the universe generated since baryosyntheses are generally consistent with a value smaller than 10⁻²⁶e cm.

2006, Marcello Giorgi, CP Violation: From Quarks to Leptons, page 477:

(cosmology) The creation of baryonic matter.


Planck epoch

(physics, cosmology) The period immediately after the Big Bang, typically viewed at around one Planck time, whereby all forces were unified.


steady state theory

(cosmology) A cosmological model of the universe in which matter is continuously created as the universe expands.


FDM

fuzzy dark matter
fuzzy dark matter#English

(particle physics, quantum mechanics, astrophysics, cosmology) Abbreviation of fuzzy dark matter.


HDM

(physics, astronomy, cosmology) Initialism of hot dark matter.


Hubble time

(astronomy, cosmology) A constant defined as 1/H_0, where H_0 is the Hubble constant. 1/H_0 is equal to 4.55×10¹⁷ seconds or 14.4 billion years.


antiuniverse

(astrophysics, cosmology) A conjectured universe formed from antimatter.

antiuniverso

a conjectured universe formed from antimatter


galaxy filament

en-noun

galaxy filament (plural galaxy filaments)

(cosmology) A massive, thread-like formation of gravitationally bound galaxies forming the boundaries between large voids in the universe.


Big Chill

heat death of the universe
heat death of the universe#English

(cosmology) Synonym of heat death of the universe


vacuum catastrophe

quantum field theory
quantum field theory

(cosmology) The disagreement of over 100 orders of magnitude between measured values of the vacuum energy density and the theoretical zero-point energy suggested by a naïve application of quantum field theory.


dark sector

From dark + sector. From being named after dark matter and dark energy, and being portion (sector) of a whole (universe).

(astrophysics, cosmology, astronomy, physics) The unknown portion of the Universe outside standard physics, including dark matter and dark energy.

The fraction of the universe that is dark matter and dark energy.


Local Volume

From local + volume from being the volume of space in which we exist (that which is local to us).

(astronomy, cosmology) the volume of space around the Milky Way Galaxy out to a distance of approximately 10 megaparsecs or 35 million lightyears away or out to a cosmological redshift recessional radial velocity of 550km/s or z<0.002


dark fluid

(astronomy, cosmology) A linked phenomenon conjectured to explain dark matter and dark energy as different manifestations of the same underlying laws of gravity.


meta-universe

(physics, cosmology) Synonym of multiverse


superbounce

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Particularly, we shall study the matter bounce scenario, the singular bounce, the superbounce and a symmetric bounce scenario.

2016, S. Nojiri, S.D. Odintsov, V.K. Oikonomou, “The bounce universe history from unimodular F(R) gravity”, in arXiv:

(cosmology) The recreation of an expanding universe through a Big Bang after the universe has completely collapsed due to gravity, as opposed to a cosmological bounce in which the universe bounces back into expansion after a contraction which is not complete.


agegraphic

Our numerical result show the effects of the interaction and anisotropic on the evolutionary behaviour the holographic and new agegraphic scalar field models.

2016, Hossien Hossienkhani, Ali Aghamohammadi, “Interacting holographic and new agegraphic scalar fields models of dark energy in non-isotropic universe”, in arXiv:

(cosmology) Related to the age of the universe


dark light

Blend of dark matter + light. From being a force found in the dark sector that acts on dark matter, analog to light in the "light sector" (the part of the universe that is not part of the dark sector) that acts on "light matter" (ordinary matter that interacts electromagnetically, thus visibly).

(astrophysics, cosmology, astronomy, physics) A hypothetical force of nature that acts on dark matter to allow dark matter to interact with itself.


Hubble flow

From Hubble (“Edwin Hubble”) + flow. From the flowing/movement of galaxies in the Universe under the influence of Hubble expansion.

(astrophysics, cosmology) The motion of galaxies due to the expansion of the universe


CGB

(uncountable, astronomy, cosmology, astrophysics) Abbreviation of cosmic gravitational-wave background.


phantom energy

Coined by physicist Robert R. Caldwell in 1998, in reference to the Star Wars movie "The Phantom Menace", in his paper "A Phantom Menace? Cosmological consequences of a dark energy component with super-negative equation of state" referring to the phantom energy menace that would lead to the Big Rip.

tooltip

Star Wars: Episode I: The Phantom Menace

(cosmology, astrophysics, astronomy, physics) A category of dark energy, where dark energy is not fixed in amount nor in density, and continuously increases over time.

Big Rip

destruction of the Universe caused by ever increasing dark energy (ie. phantom energy)

cosmological constant

a category of dark energy, where dark energy is constant in density


AdS

(physics, mathematics, cosmology) Initialism of anti de Sitter.


Big Freeze

(cosmology) Synonym of heat death of the universe.


light sector

Blend of light + dark sector. From not being part of the dark sector.

(astrophysics, cosmology, astronomy, physics) The known universe; the part of the universe that is not part of the dark sector; the segment of the universe that is explained by the known laws of physics, and whose components (particles) are predicted by it. The portion of the universe that is not dark matter nor dark energy.

The fraction of the universe that interacts with electromagnetism (ie. light).


Planck relic

(physics, cosmology, astronomy, astrophysics, quantum mechanics, relativity theory) A black hole with an event horizon on the order of a Planck length (~ 10⁻³⁵ metres), and a mass on the order of a Planck mass (~ 20 micrograms).

quantum mechanics; relativity theory; quantum mechanics; relativity theory


precosmogonic

(cosmology) occurring or existing before the creation of the universe


habitable epoch

cosmic microwave background
cosmic microwave background#English

(cosmology, astrobiology, astronomy) An era of a Big Bang based universe with the physical laws of our Universe, where the cosmic microwave background is energetic enough to heat water into a liquid state, making all bodies beyond the inner limit of the habitable zone possible in hosting liquid water regardless of the amount of insolation provided by the local star.


superquintessence

The second is ascribed to the Magnalia, the third is out of its own specifics. Indeed, the superquintessence sustains the quintessence itself as well as the other four.

1910, Hermetic medicine and hermetic philosophy, Pacific Section, American Association of Petroleum Geologist, page 340:

The wormhole is modeled by a thin sphercial shell accreting the superquintessence fluid, --- two different models are presented.

2005, Mathematical Reviews, Part 1000, American Mathematical Society, page 11639:

It has not been entirely ruled out that the acceleration (discovered in 1998) in the expansion of the universe could be due in part to cosmic exotic matter (called "superquintessence"). Such matter could support cosmic wormholes.

2011 June 16, “If wormholes existed, what would happen if you tried to push one end through the other?”, in reddit.com:

(rare, physics, cosmology) Phantom energy, cosmic exotic matter, and a likely explanation for dark energy itself, which can violate all energy conditions; a substance that both transcends and sustains the very quintessence itself, as well as the four elements.


superquintessential

For instance, if we adopt models of dark energy as potential energy of some, as yet undiscovered, scalar field, we cannot obtain superquintessential values w < −1, unless we consider phantom fields or non–minimal coupling terms.

2011 November 16, Ester Piedipalumbo, Paolo Scudellaro, “A Matter–Dominated Cosmological Model with Variable G and Λ and Its Confrontation with Observational Data”, in arxiv.org:

The dark energy equation of state w parameter as a function of t , for the potential in Eq. (3.60) for A = 1, λ = 1, and σ = 1: it turns out that such a scalar field can be interpreted as a superquintessential field.

2012 July 21, Giampiero Esposito, Claudio Ruban, “On Quintessential Cosmological Models and Exponential Potentials”, in researchgate.net:

The superquintessential septuplets.

2021 July 27, “Daily Miku #154”, in reddit.com, archived from the original on 2021-08-31:

(rare, physics, cosmology) Of or relating to superquintessence.


Recombination

From recombination.
The name is slightly inaccurate and is given for historical reasons: in fact the electrons and atomic nuclei were combining for the first time.

Cosmic Microwave Background
Cosmic Microwave Background#English

(cosmology) The epoch of recombination of the Universe, where atomic matter formed from free particles, combining protons with electrons. One of the Ages of the Universe. The cosmic era when neutral hydrogen formed out of the cosmic soup of protons and electrons in plasma, that condensed out of the energy of the Big Bang. This era produces the Cosmic Microwave Background (CMB).


Reionization

(cosmology) The epoch of reionization of the Universe, where matter decoupled from energy, and space became transparent to radiation. One of the Ages of the Universe. The cosmic era when ultraviolet radiation of the first (Population III) stars and quasars ionized neutral hydrogen, ending the Cosmic Dark Age(s).


Hubble volume

(cosmology) the spherical region of the observable universe surrounding an observer beyond which objects recede from that observer at a rate greater than the speed of light due to the expansion of the Universe.


lumpiverse

en-noun

lumpiverse (countable and uncountable, plural lumpiverses)

(cosmology) The universe considered to be lumpy (not the same everywhere)


Big Bounce

(cosmology) The Big Bang when conceived by certain cosmological models as having followed the collapse of a previous universe.


Big Brake

(cosmology, uncommon) A hypothetical future singularity in which the expansion of the universe decelerates at an infinite rate.


black hole star

black hole star (plural black hole stars)

From black hole + star. From being a radiant spherical celestial object containing a black hole.

(astronomy, cosmology) A theoretical early universe object, with the outer layers of a star and a black hole for a stellar core. Theorized to be born of an ultramassive pre-stellar nebula collapse to an ultramassive protostar, and later birthing an intermediate mass black hole when the star's life ends.


Copernican time principle

An extension of the Copernican principle (“a principle which states that the location of humanity has no special significance”).

(cosmology) A principle which states that the current time has no special significance.


Copernican principle

Named after Nicolaus Copernicus by Austrian-British cosmologist Hermann Bondi in reference to his model of Copernican heliocentrism.

(cosmology) A principle which states that the location of humanity has no special significance (in constrast to traditional views that the Earth or Sun are located in the center of the Universe).

Copernican heliocentrism
Copernican principle
Hermann Bondi
Nicolaus Copernicus


Local Hole

Hole referring to a low-density region of the universe; local since it encloses the Earth.

(astronomy, cosmology) A supervoid around 2 billion light years across that encloses much of the local Laniakea supercluster.


Local Void

local+void. From being a void in the local universe, located near us.

(astronomy, cosmology) A void in Universe A region of space with very low density, from which our galaxy cluster, the Local Group, sticks into like a headland, and for which the Local Sheet, which the Local Group is attached to, forms one wall of.


fuzzy dark matter

From the lack of definition (fuzziness) due to the wave-like nature of fuzzy dark matter, unlike the particle-like of hot dark matter and cold dark matter.

de Broglie wavelength
de Broglie wavelength#English

(physics, cosmology, astronomy) A type of dark matter with very low particle mass, with concomitant very large de Broglie wavelength (such as wavelength on the order of kiloparsecs), resulting in a population of overlapping waves, and concentrations of this dark matter modeled as fields and interference patterns, over astronomical and cosmological distances.


Ho'oleilana

Translingual: Ho'oleilana

Hawaiian: Hoʻoleilana

/ˌhəʊ.əʊleɪˈlɑːnə/

From Hawaiian hoʻoleilei ka lana (“sent sounds of awakening”). Coined by R. Brent Tully, Cullan Howlett, and Daniel Pomarède in 2023; see quotation below.

coinage

In any event, this apparent ring structure at a distance of ∼250 Mpc from us is one of the largest structures observed in the nearby Universe to date and links together a number of hitherto disconnected components of our cosmic neighborhood. We name this remarkable structure "Ho'oleilana."
fn: "Sent murmurs of awakening" from the Hawaiian Kumulipo creation chant: Ho'oleilei ka lana a ka Po uliuli, "From deep darkness came murmurs of awakening."

2023, R. Brent Tully, Cullan Howlett, Daniel Pomarède, “Ho'oleilana: An Individual Baryon Acoustic Oscillation?”, in The Astrophysical Journal, volume 954, number 2:

baryon acoustic oscillation
baryon acoustic oscillation#English

(astronomy, cosmology) Ho'oleilana A structure in local Universe; An assembly of superclusters and voids, forming a spherical assemblage of matter with a central peak, roughly 1-billion-lightyears across, located next to, but not containing, Laniakea, our local supercluster where the Earth is contained within. Thought to be a baryon acoustic oscillation (“BAO”), the first such discovered, and the nearest such found.


Big Banger

Steady Staters were convinced that Big Bangers did not know what they were talking about, and vice versa.

2001, Rem Blanchard Edwards, What Caused the Big Bang?, page 66:


steady stater

(cosmology) A believer in the steady state theory.


lookback time

(astronomy, cosmology) The amount of time elapsed between the moment that light is detected on Earth and the moment it was originally emitted by the source.


crossing time

(astronomy, cosmology) The amount of time required for a star or galaxy to make a crossing from one side of a gravitationally bound cluster to the other.


dynamical time

en-noun

dynamical time (countable and uncountable, plural dynamical times)

(astronomy, cosmology) A time scale used to calculate the orbital motions of objects within the Solar System.


deuterium bottleneck

(cosmology) A critical stage in the early universe's nucleosynthesis process, in which the temperature was high enough for many photons to have energy greater than the binding energy of deuterium; therefore any deuterium that was formed was immediately destroyed.


round-trip light time

round-trip light time (countable and uncountable, plural round-trip light times)

(cosmology) The amount of time required for an electromagnetic signal to travel from Earth to a spacecraft or another celestial body within the Solar System and then return.


extremal black hole

extremal black hole (plural extremal black holes)

(astrophysics, cosmology) A black hole with the minimum possible mass that is compatible with its charge and angular momentum.


cosmic time

cosmic time (countable and uncountable, plural cosmic times)

(physics, cosmology) The measure of time by a physical clock with zero peculiar velocity in the absence of matter overdensities or underdensities; commonly used in the Big Bang models of physical cosmology.


dark-zilla

From dark + -zilla. From being the dark sector version of WIMPzilla. Coined by Katherine Freese and Martin Wolfgang Winkler in 2023.

(physics, cosmology) Theoretical extremely massive dark matter particle, orders of magnitude greater than 10¹⁰ GeV (gigaelectronvolts), thought to be generated by a vacuum phase change event, where rapidly colliding collapsing bubbles of false vacuum generate the particles in energetic collisions.


multiversally

en-adv

multiversally (comparative more multiversally, superlative most multiversally)

more multiversally (comparative)
most multiversally (superlative)

The mission is critical but need not be rushed. The storm has been brewing for several weeks, and will not reach multiversally devastating proportions for a few months.

1980, TSR, Frank Mentzer, Dungeons & Dragons 1st Edition: The Immortal Storm Complete, Rainbow Communications, →ISBN, page 25:

I have no knowledge of any Project 616,” I say. "I can only conjecture. Let me think.. .'616' is the multiversally agreed designature of this Universe.”

2014, Dan Abnett, Rocket Raccoon and Groot: Steal the Galaxy!: An Original Novel of the Marvel Universe, Marvel Worldwide, →ISBN, page 148:

Our answer: Well, duh! Multiversally, baby.

2016, Linda Varsell Smith, Star Stuff: A Soul-Splinter Experiences the Cosmos, Rainbow Communications, →ISBN, page 25:

(rare, physics, science fiction, fantasy, cosmology) In a multiversal manner.


stellar black hole

en-noun

stellar black hole (plural stellar black holes)

gravitational collapse
gravitational collapse

(astrophysics, cosmology) A black hole formed by the gravitational collapse of a star.


eternal black hole

eternal black hole (plural eternal black holes)

(astrophysics, cosmology) A theoretical idealization of a usually stationary black hole that has existed forever, rather than being formed from the collapse of some matter.


intermediate mass black hole

intermediate mass black hole (plural intermediate mass black holes)

(astrophysics, cosmology) A class of a black hole with a mass in the range of 102–105 solar masses.


micro black hole

micro black hole (plural micro black holes)

(astrophysics, cosmology) A hypothetical tiny black hole, of less than one solar mass, for which quantum mechanical effects play an important role.


BZ black hole

An initialism of Roger Blandford and Roman Znajek, theoretical astrophysicists.

The 'Blandford-Znajek' (BZ) black hole magnetospheric power extraction process was one of the first (1977) analytic attempts to define a general relativistic theory for axisymmetric, stationary, ideal-MHD, BH magnetospheres.

2002, Chang-Hwan Lee, Hŏn-yŏng Chang (editors), Current High-energy Emission Around Black Holes, page 36:

(astrophysics, cosmology) A rotating black hole that extracts energy from its rotation and magnetic fields to emit a jet of particles and radiation.


horizon problem

(cosmology) The cosmological fine-tuning problem of explaining the observed homogeneity of causally disconnected regions of space in the absence of a mechanism that sets the same initial conditions everywhere.


BoA

basin of attraction
basin of attraction#English

(acronym, initialism, cosmology) Abbreviation of basin of attraction; the gravitational center of a supercluster of galaxies; a Great Attractor.