Introduction
According to the sub-extremal Kerr metric in Boyer–Lindquist coordinates, a rotating black hole has two event horizons. Objects in the exterior universe (
), by crossing the outer horizon
, can only fall unidirectionally to decrease
r-coordinate (
). As the objects enter the inner horizon
, space and time are inversed back (
). The maximum analytical extension suggests that the objects could exit from the inner horizon, pass through the unidirectional zone, and enter a new universe. This hypothetical path (
Figure 1) is a wormhole, but might not be traversable
1. Its throat is in the inner horizon with three singularities
2, at the center of which is a violet, lethal Belinski–Khalatnikov–Lifshitz (BKL) singularity
2-4. The BKL singularity is also a Weyl singularity
5, at which the Weyl curvature diverges to infinity:
, corresponding to the maximum entropy (Penrose’s Weyl curvature hypothesis
4).
It is believed that the universe started from a pure energy Ricci singularity (
), at which the Weyl curvature vanishes:
, equivalent to the minimum entropy
4. The mass-energy, including spacetime, of the universe was generated from the Big Bang; the universe was a white hole. This evolution can also be seen in
Figure 1.
Now if we divide the whole evolution curve outside the outer horizons, we obtain wormholes. If we divide it inside the inner horizons, we have aeons. Shall we recognize Nature as wormholes or aeons? The latter! As “the endpoint of evolution”6, the BKL singularity is a natural watershed to section the evolution curve. Each aeon starts from a Ricci singularity, then develops, and eventually concludes at (multiple) BKL singularities. The Second Law of thermodynamics is valid for individual aeons.
The critical question left unanswered is about the crossover between aeons. As soon as the Weyl singularities were discovered, King predicted the direction of evolution by stating that “the Weyl singularities are unstable against degenerating into ‘big bang’ singularities: should any matter be projected into them it seems certain that we would get ”5. As discussed in Penrose’s work7, Wheeler, Smolin, and others made the same prediction that “new aeons emerge from black-hole singularities.” Penrose also suspected the origination of “[the Big Bang] singularity from [a] wildly chaotic black-hole riddled (BKL?) collapse,” though he opted to the ultimate hypersurface for his conformal cyclic cosmology (CCC)7. In this work, we show how the collapse of the BKL singularity initiated the Big Bang.
Collapse of a Neutrino star Singularity
By studying the fundamental particles and reactions of Nature, we find that the BKL singularity would be a neutrino star. While the detail is in our early work
8, a brief discussion is provided here. Neutrinos have long been found to be related to vacuum energy
9. The neutrino mass would be tied up with the energy density of the vacuum by a reversible reaction:
The fundamental spacetime particles A and would annihilate at neutrinos with the release of dark energy into the vacuum, while the energy of the vacuum would recreate the spacetime particles at arbitrary distances (appear as quantum fluctuations). Based on this dynamic equilibrium, estimated from the vacuum energy density9: , the upper limit of the mass of the lightest neutrino: .
Neutrinos (larger particles such as neutrons have crushed) would accumulate in the inner horizon, forming a neutrino star (its real geometric shape would not be of importance). More importantly, because spacetime annihilates at neutrinos (the forward of reaction 1), the neutrino star, at which geodesics are terminated, would be a spacetime singularity. The annihilation would inevitably accompany with the recreation of spacetime due to high local energy density (the reverse of reaction 1), so the neutrino star singularity would be very chaotic. The recreated spacetime particles and their energy form would not be immobilized (because they are not neutrinos) at the neutrino star, but thrown out as
emission beams symmetrically about it (
Figure 2). Therefore, spacetime would be stretched along the beams while squashed along the other directions. By approaching the highly compacted, spinning neutrino star, spacetime would become more and more violet and diverge to an infinity curvature. All these characters match those at the BKL singularity
2-4. Therefore, unlike any observable astronomical object, a neutrino star would be a singularity hidden within a black hole (Penrose’s weak cosmic censorship hypothesis).
As neutron degeneracy pressure supports neutron stars, neutrino degeneracy pressure would prevent neutrino stars from collapsing. Analogous to the Tolman-Oppenheimer-Volkoff limit for neutron stars, we estimate a mass limit for neutrino stars:
where
mn,
Mn, and
are the masses of a neutron, a neutron star, and the sun, respectively. Another method to estimate the mass limit is to calculate the Jeans mass of the neutrino
10:
where
MPl is the Planck mass. Without considering any addition due to the rotation of black holes, both lowermost values estimated from the uppermost neutrino mass are close to the mass of the observable universe, ca.
. Estimated from the smallest neutrino size (the measured cross section
9 is 10
-56 cm
2, identical to the unification distance in the grand unified theory, 10
-28 cm) the volume of a neutrino star with
would be as small as 6 m
3 (equivalent to
).
As King
5 foresaw, matter and energy keep falling into a black hole (not an isolated system), so its mass would eventually exceed
, resulting in a further collapse. Like any other Oppenheimer-Snyder collapse, it would tremendously raise the temperature (all neutrinos annihilate into pure energy,
). At such a high temperature, it is natural that the entropy would reach the minimum:
, where
kB is the Boltzmann constant. In short, as a neutrino star (a future-spacelike singularity,
) collapses into a timelike Ricci singularity (
), a new aeon would start (
Figure 1), with expanding spacetime and a new neutrino star (a past-spacelike singularity,
). This collapse-expansion procedure has been called the
Big Bounce; the collapse would be a process opposite to the cosmological inflation
11. Thus the evolution curve (
Figure 1) would make very small angles with the horizontal right before and after the Big Bang (
), and have a U-turn at the Big Bang (
). While the collapse at a specific black hole is an ultrashort (
) entropy fluctuation, the Second Law would still be sustained for the entire evolving system (i.e. Nature, a truly isolated system). As Zel’dovich
6 pointed out, for “cosmological collapse and black holes,” “the general solution of Einstein’s equations is highly anisotropic near the [BKL] singularity;” for “cosmological expansion and white holes,” “the Kasner solution transform[s] into an isotropic expansion”. By studying the
collisions between the anisotropic spacetime from before the Big Bang and the isotropic expansion after the Big Bang, we would find where the Big Bang occurred or the Center of the universe.
The Center and Spin of the Universe
The emission beams
Vb (
Figure 2) symmetric about the neutrino star, due to weaker collisions with the isotropic Big Bang wave
VBB, result in two cold spots in the cosmic microwave background (CMB,
Figure 3A):
NC, corresponding to Cold Spot I
12 and Peak 1
13,14, at
, and
SC, corresponding to Cold Spot II
12 and Peak 5
13,14, at
. The spiral flows
Vs falling towards the neutrino star (
Figure 2), because of stronger collisions with the
VBB, lead to a hot ring. The Center is at the intersection of the
Vb line (line
NC-
SC) and the
Vs plane determined by the following methods.
The most noticeable hot region is the large-scale Peak 3 at
(from the figures in ref.
14), which, with Peak 4 at
15, is known as the Axis of Evil
16,17 (AoE,
Figure 3A), whose vector is in the direction
16. While the AoE offers an interesting starting point, Peak 4 is too close to
SC or the
Vb (
Figure 3B), and hence would not be from the
Vs; the calculated intersection (Method O,
Table 1) does not seem to match astronomical observations.
By reanalyzing the CMB, we find that arc
ST (
Figure 3A), similar to Peak 3, shows large-scale high temperatures. Thus arcs
PQ and
ST are used to determine the
Vs plane (
Figure 3C):
where
is the radius of the surface of last scattering (SLS). It intersects line
NC-
SC at
and at a distance
away from where we are (hereafter represented by the Local Supercluster or LS) (Method I,
Table 1). Since
18, the Center is ca. 9.3 Gpc or 30 billion light years away from us. Only half of the hot ring (arcs
PQ and
ST) is observed, while the other half is hardly visible. This is due to the Doppler effect and the Doppler beaming: the
Vs flows were spiraling towards the precursor neutrino star (
Figure 2). We therefore find that: i) if we look from the LS to the Center, the universe is rotating or spinning clockwise; ii) the
Vs plane is the equatorial plane of the universe; iii) the LS is inside the Northern observable universe; iv) the Northern observable universe is bigger than the Southern; v) the axis of spin of the universe is:
vi) the spin axis intersects with the SLS at and ; vii) the angle between the equatorial plane and the Galactic plane is .
Method II is based on the low-variance circles (LVC) that Gurzadyan and Penrose
19,20 found. Regions
X and
W show characteristic properties of the
Vs flows (
Figure 3D and
Figure 3E), and therefore are employed to define the
Vs plane. Based on Bodnia
et al.’s coordinates
21: Region
X at
and Region
W at
, line
XW almost intersects line
NC-
SC (
Figure 3D), so the closest point at
and at a distance
can be regarded as the Center (Method IIA,
Table 1). If the Regions are used to define the
Vs plane with Peak 3 (
Figure 3E), then the Center is at
and at a distance
(Method IIB,
Table 1). These results are virtually the same as those from Method I.
Paradox of the Existence of the Center
It is generally believed that the universe has no center, with the reason being that the Big Bang happened everywhere, or that the Hubble flow is observed everywhere. Another would argue that it is nonsense to locate a center within the universe, as space itself was from the Big Bang. Based on our mechanism, the universe is finite and has a center. As in the raisin bread model, the center of the bread is the dough before baking (without gravity), the Center is where the precursor black hole collapsed in the previous aeon and now in the present aeon.
One might also wonder how our mechanism could generate an isotropic and homogeneous universe. It is important to first note that more and more astronomical observations have shown that the universe has small magnitudes of anisotropies and inhomogeneities (details below). Based on our mechanism, any potential massive objects near the precursor neutrino star would have been merged. Without the influence of the surroundings (all the flows discussed above were negligible), the new-born universe was isotropic and homogeneous4,6. During the course of expansion, Hubble’s law is always valid, even for objects with separation greater than the Hubble length22,23. An analysis of the CMB indicates that anisotropic expansion is strongly disfavoured, with odds of 121,000:1 against24. The only deviation away from the cosmological principle is from the centrifugal force that has been deforming the universe. Therefore, while the local universe looks almost isotropic and homogeneous, the original uniformity is maintained for an early image such as the CMB, because the deviation due to the spin is dipolar and overshadowed by the peculiar motion. Unless we were near its edge (we are not), the universe from our mechanism appears very isotropic and homogeneous.
Independent Observational Evidence
While the theoretical analysis indicates that black holes are the embryos of the universes of the next aeons, the match of the results from Methods I and II is a solid piece of direct evidence of our mechanism. Besides them, various independent observational evidence has been reported in the literature. For future convenience, we define a
Universal Coordinate System (
Figure 4A), in which the LS is set at zero degrees longitude and the
the unit length. The angle between the line from the Center to the LS and the equatorial plane is ca.
and the distance between the LS and the Center is ca.
, so the universal coordinates for the LS are:
.
The first category of evidence is the inhomogeneous compositions of the universe. In the inner horizon of the precursor black hole, the
Vb and
Vf would sweep in a high angular speed, producing discontinuous clumps of high-density mass-energy across the space (
Figure 2). After the Big Bang, these flows, together with the
Vs, would collide with the
VBB, resulting in overdense clumps and debris as primordial nucleation centers (PNC) for the formation of primordial black holes or primordial galaxies. In addition to the LVC, some PNC would have been observed as the Hawking points
25. Compared to structure formation theories in which overdensities are the consequence of minute quantum fluctuations, our mechanism generates the PNC much earlier and more mature, and hence explains multiple extraordinary astronomical facts, such as an unexpectedly large number
26 of unexpectedly mature
26 and unexpectedly bright
27 galaxies observed by the JWST with unexpectedly high mass
28,29 formed at an unexpectedly short time
26, as well as the extraordinarily large cosmic structures (such as Ho’oleilana
30) and black holes (candidates
31: Phoenix A and 4C+74.13, etc.). Note that the first galaxies in the early JWST deep fields
32, such as SMACS-0723 (close to the Center,
), CEERS (
), and GLASS (
), are in the higher-density zones (
, the angle between line
NC-
SC and the
Vs plane), so are the large cosmic structures and black holes
30,31.
The second category of evidence is cosmic anisotropies. Our mechanism does not provide any massive structures at the Center after the Big Bang (for comparison, before the Big Bang there was a massive neutrino star). With the centripetal force requirement, the spinning universe has been expanding faster along the rotationally radial direction and slower along the axis of spin. Thus the universe has been veering towards the ellipsoidal (
Figure 4A). This deformation changes our observable universe accordingly. Campanelli
et al. suspected that the SLS was ellipsoidal
33. Strictly speaking, the observable universe is not ellipsoidal, because it does not have orthogonal axes as the universe does or, equivalently, the LS is not on the equatorial plane. Therefore, the exact direction of the fastest or slowest expansion is unknown, because it is related to the size of the universe that is unknown (the lowermost would be
). If the dominating Hubble flow were removed, while always in the Northern universe, the LS would move
closer to the equatorial plane. Therefore, the fastest expansion direction (FED) of the observable universe shall be close to the outward rotationally radial direction, skewing towards the equatorial plane (
Figure 4A). As the expansion is slower along the axis of spin, the slowest expansion direction (SED) shall be close to the inward rotationally radial direction
, skewing away from the equatorial plane (
Figure 4A).
This preferred direction is confirmed by multiple independent astronomical observations
34-44. Probably because the magnitudes of those anisotropies are very small (
), the observed directions are scattering for different properties, as well as for the same properties (
Figure 4B and
Figure 4C). With such small anisotropies, the obtained coordinates of the Center (
Table 1), though would bias the North, are unnecessary to correct; the SLS can be regarded as a sphere. Other than the fine-structure constant
α dipole
34,35 that is generally attributed to a different mechanism
45,46, slower expansion in the SED appears as lower accelerating expansion (dark energy dipole
35), brighter Type Ia supernovae (SNe Ia dipole
36), smaller Hubble constant
(galaxy cluster anisotropy
37), or mutually approaching flows of galaxies (such as bulk flows
38-41). With the understanding that those anisotropies share the same mechanism, we can convert from one to another.
The third category of evidence is time variations. While the LS is moving away from the direction of the slower expansion (
Figure 4A), the universe has been expanding in acceleration
47,48. While the LS moves away from the direction of the smaller
, the Hubble tension indicates that the
was smaller in the past
49. While the LS moves away from the direction of the slower expansion or higher matter density and amplitude of growth of structures, the
S8 tension indicates that the
S8 value was larger in the past
50.
Data Availability Statement
All results in this work are obtained using publicly available data.
Acknowledgments
J.B.B. would like to thank Profs. Z. Shen, K. Yao, X. Jiang, F. Bo, Y. Cheng, S. Han, G. Chen, and Q. Yu at Zhejiang University for their inspiration. N.P.B. would like to dedicate this work to his grandparents in China.
Competing Interests
The authors declare no competing interests.
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