Black Holes and Neutron Stars in an Oscillating Universe

Gorkavyi, Nick; Tyul’bashev, S. A.

doi:10.1134/s199034132103007x

Cited by 12 publications

(19 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Crunch is close to the modern distribution of black holes because a population of relic black holes can form from astrophysical black holes that accumulate in the repeating cycles of the Universe [19]. The observed population of black holes consists mainly of SBH from 4 to 100 M [19,34] and SMBH with ∼ 10 5 − 10 10 M located in the centers of galaxies [35].…”

Section: Gwb In a Multi-component Modelmentioning

confidence: 86%

“…where for the estimation it was taken: N = 10 22 [19]; R = 10 7 cm; D ≈ 10 10 ly; a ≈ 3 ly; V ≈ c. We assumed that the relative velocities of black holes in a maximally compressed Universe are comparable to the speed of light. The hypothesis about the accumulation of black holes and GWB from cycle to cycle of the Universe [19] will change the meaning of the parameters in Eq. ( 9), for example, N will mean the sum of GWB sources for a certain number of cycles.…”

Section: Gwb In a One-component Modelmentioning

confidence: 99%

“…Our work analyzes the formation of the GWB in a cyclic Universe. The model of an oscillating Universe was popular until the 1980s [2,3,5,15] and now there is a growing interest in this model [16,17,18,19]. The classical cyclic cosmology included a mechanism of the periodical transformation of chemical elements: the effective photodissociation of heavy atomic nuclei into individual baryons began when the temperature of the electromagnetic relic radiation in the compressed Universe reached ∼ 3 * 10 10 K. This is how hydrogen was created to form stars in a new cycle.…”

Section: Introductionmentioning

confidence: 99%

“…In [19,21,22], a cyclic model of the Universe with a large number of black holes has been analyzed (see Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

“…The era of multiple merger of black holes begins when the Universe shrinks to a volume comparable to the total volume of existing BHs. This process should be natural for many cyclic models of the Universe [16,17,19,21,22,25]. It is easy to estimate that the total volume of BHs in the Universe is determined by the most massive SMBHs: if we take the average SMBH mass of 10 8 M [12], then 10 11 such holes can be packed into a box with a size of 0.3 ly.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Gravitational wave background discovered by NANOGrav as evidence of a cyclic universe

Gorkavyi

2021

Preprint

View full text Add to dashboard Cite

The consortium NANOGrav discovered the isotropic gravitational wave background (GWB) with an amplitude of h ∼ 10 −15 and a frequency of f ∼ 10 −8 Hz using observations of millisecond pulsars. We hypothesize that the GWB is relic radiation left over from the merging stellar mass black holes (SBHs)during Big Crunch at z ∼ 10 10 . The relic gravitational waves are similar to the gravitational waves with f ∼ 10 2 Hz discovered by LIGO in 2015, taking into account a decrease in frequency by a factor ∼ 10 10 due to the expansion of the Universe. We take as a basis the observed spectrum of 139 SBHs, discovered by the LIGO observatory. Our model explains well all the observed features of the GWB. Unlike all other GWB models, our model predicts a sharp decrease in the GWB amplitude at frequencies f > 3.5 * 10 −8 Hz, reflecting the deficit of SBHs with masses < 4M . The SBMH mergers at Big Crunch should generate yet undiscovered GWB with a frequency of f ∼ 10 −(14−17) Hz.

show abstract

Section: Gwb In a Multi-component Modelmentioning

confidence: 86%

Section: Gwb In a One-component Modelmentioning

confidence: 99%