Primordial Black Hole Research Papers (original) (raw)

This thesis begins with a study of the origin of cosmological fluctuations with special attention to those cases in which the non-Gaussian correlation functions are large. The analysis shows that perturbations from an almost massless auxiliary field generically produce large values of the non-linear parameter f_NL. The effects of including non-Gaussian correlation functions in the statistics of cosmological structure are explored by constructing a non-Gaussian probability distribution function (PDF). Such PDF is derived for the comoving curvature perturbation from first principles in the context of quantum field theory, with n-point correlation functions as the only input. The non-Gaussian PDF is then used to explore two important problems in the physics of primordial black holes (PBHs): First, to compute non-Gaussian corrections to the number of PBHs generated from the primordial curvature fluctuations. The second application concerns new cosmological observables. The formation of PBHs is known to depend on two main physical characteristics: the strength of the gravitational field produced by the initial curvature inhomogeneity and the pressure gradient at the edge of the curvature configuration. We account for the probability of finding these configurations by using two parameters: The amplitude of the inhomogeneity and its second radial derivative, evaluated at the centre of the configuration. The implications of the derived probability for the fraction of mass in the universe in the form of PBHs are discussed.

- by
- •
- Quantum Field Theory, Primordial Black Hole, Pressure Gradient, Perturbation Theory

The principle of nuclear democracy is invoked to prove the formation of stable quantized gravitational bound states of primordial black holes called Holeums. The latter come in four varieties: ordinary Holeums H, Black Holeums BH, Hyper Holeums HH and the massless Lux Holeums LH.These Holeums are invisible because the gravitational radiation emitted by their quantum transitions is undetectable now. The

- by Abhijit Chavda
- •
- Quantum Gravity, Dark Matter, Quantum Cosmology, Dark Energy
- by Tomohiro Harada
- •
- Black Holes, Evaporation, Hawking Radiation, Cosmology

Abstract. In the classical theory black holes can only absorb and not emit particles. However it is shown that quantum mechanical effects cause black holes to create and emit particles as if they were hot bodies with temperature ~ ~ 10... more

- by David Toms
- •
- Mathematical Physics, Physics, Quantum Physics, Thermodynamics
- by Alexey Petrov
- •
- Dark Matter, Low Energy Buildngs, Black Hole, Primordial Black Hole
- by Vyacheslav I Dokuchaev
- •
- Phase transition, Black Hole, Primordial Black Hole

This paper explores the consequences of non-Gaussian cosmological perturbations for the formation of primordial black holes (PBHs). A non-Gaussian probability distribution function (PDF) of curvature perturbations is presented with an explicit contribution from the three-point correlation function to linear order. The consequences of this non-Gaussian PDF for the large perturbations that form PBHs are then studied. Using the observational limits for the non-Gaussian parameter fNLf_{NL}fNL, new bounds to the mean amplitude of curvature perturbations are derived in the range of scales relevant for PBH formation.

- by Juan Hidalgo
- •
- Quantum Cosmology, Astrophysics, Linear Order, Primordial Black Hole

Array-based, direct-sampling radio telescopes have computational and communication requirements unsuited to conventional computer and cluster architectures. Synchronization must be strictly maintained across a large number of parallel data streams, from A/D conversion, through operations such as beamforming, to dataset recording. FPGAs supporting multi-gigabit serial I/O are ideally suited to this application. We describe a recently-constructed radio telescope called ETA having all-sky observing capability for detecting low frequency pulses from transient events such as gamma ray bursts and primordial black hole explosions. Signals from 24 dipole antennas are processed by a tiered arrangement of 28 commercial FPGA boards and 4 PCs with FPGA-based data acquisition cards, connected with custom I/O adapter boards supporting InfiniBand and LVDS physical links. ETA is designed for unattended operation, allowing configuration and recording to be controlled remotely.

- by Kshitija Deshpande
- •
- Computer Hardware, Low Frequency, Cluster Computing, Data acquisition
- by Patrick Dasgupta
- •
- Field Theory, Quantum Physics, Thermodynamics, CP Violation
- by Diego N Pelliccia
- •
- Quantum Field Theory, High Energy Physics, Magnetic field, Black Hole

Astrophysical limitations do not exclude a possibility that some number of dark matter primordial Black Holes (BHs), barionic as well as nonbarionic in origin, seeded in the interiors of the Earth at the epoch of planet condensation in the young Solar System. We show that limitations on the neutrino radiation due to the BH quantum evaporation and accretion growth of BH completely forbid the existence of primordial BHs of any mass in the Earth.

- by Vyacheslav I Dokuchaev
- •
- Earth Sciences, Black Holes, Primordial Black Hole
- by Marshall Eubanks
- •
- Dark Matter, Primordial Black Hole, Formation of the Solar System, Quark Matter
- by Seyyed Alireza Tabatabaei
- •
- Stellar Evolution, Multidisciplinary, Nature, Black Hole
- by A. Qadir
- •
- Mathematical Physics, Quantum Physics, Dark Energy, Hawking Radiation
- by Diego N Pelliccia
- •
- Black Holes, Evaporation, Magnetic field, Cosmology

Hawking&amp;#39;s contributions to black-hole theory are discussed. The development of the classical theory of black holes is reviewed, and attention is given to primordial black holes, the... more

Hawking&amp;#39;s contributions to black-hole theory are discussed. The development of the classical theory of black holes is reviewed, and attention is given to primordial black holes, the &amp;#39;no-hair&amp;#39; theorem, the mathematical analogy between black-hole mechanics and thermodynamics, physical singularities, and white holes. Hawking&amp;#39;s application of quantum theory to black holes is examined along with the startling result obtained, viz., that

- by Dennis Overbye
- •
- Thermodynamics, Quantum Theory, Big Bang, Cosmic Microwave Background
- by Mohammad Ozair Ansari
- •
- Statistical Mechanics, Quantum Gravity, Loop Quantum Gravity, Space Time
- by Tomislav Prokopec
- •
- Inflation, Black Hole, Primordial Black Hole, Spectrum
- by Bernard Carr
- •
- Stellar Evolution, Gravitation, Bibliography, Black Holes
- by BIKASH CHANDRA PAUL
- •
- Field Theory, Quantum Physics, Thermodynamics, Quantum Cosmology
- by Kei-ichi Maeda
- •
- Quantum Physics, Unified Field Theory, Black Hole, Primordial Black Hole
- by Vitaly Kocharovsky
- •
- Magnetic field, Standard Model, Gamma Ray Burst, Black Hole
- by Matt Lebofsky and +1
- •
- Mechanical Engineering, Aerospace Engineering, Primordial Black Hole, Survey data

The multipolar-post-Minkowskian approach to gravitational radiation is applied to the problem of the generation of waves by the compact binary inspiral. We investigate specifically the third post-Newtonian (3PN) approximation in the total energy flux. The new results are the computation of the mass quadrupole moment of the binary to the 3PN order, and the current quadrupole and mass octupole to the 2PN order. Wave tails and tails of tails in the far zone are included up to the 3.5PN order. The recently derived 3PN equations of binary motion are used to compute the time-derivatives of the moments. We find perfect agreement to the 3.5PN order with perturbation calculations of black holes in the test-mass limit for one body. Technical inputs in our computation include a model of point particles for describing the compact objects, and the Hadamard self-field regularization. Because of a physical incompleteness of the Hadamard regularization at the 3PN order, the energy flux depends on one unknown physical parameter, which is a combination of a parameter \lambda in the equations of motion, and a new parameter \theta coming from the quadrupole moment.

- by Bala Iyer
- •
- General Relativity, Relativistic cosmology, Data Analysis, Black Holes
- by Bernard Carr
- •
- Black Hole, Primordial Black Hole

Recent developments in the study of primordial black holes (PBHs) will be reviewed, with particular emphasis on their formation and evaporation. PBHs could provide a unique probe of the early Universe, gravitational collapse, high energy... more

- by Bernard Carr
- •
- Quantum Gravity, High Energy Physics, Early Universe, Gravitational Collapse

We calculate neutrino and photon energy spectra in extragalactic space from evaporation of primordial black holes, assuming that the power spectrum of primordial density fluctuations has a strong bump in the region of small scales. The... more

- by Edgar Bugaev
- •
- Primordial Black Hole, Power Spectrum
- by Tomohiro Harada
- •
- Quantum Physics, Dark Matter, Numerical Relativity, Black Hole
- by Shigehiro Nagataki
- •
- Cosmology, Power Law, Primordial Black Hole, Spectrum
- by Paulo Custodio
- •
- Quantum Physics, Kinetics, Critical Mass, Black Hole

We show that if photon possesses a tiny but non-vanishing mass the universe cannot be electrically neutral. Cosmological electric asymmetry could be generated either at an early stage by different evaporation rates of primordial black holes with respect to positively and negatively charged particles or by predominant capture of protons in comparison to electrons by heavy galactic black holes in contemporary universe. An impact of this phenomenon on the generation of large scale magnetic fields and on the universe acceleration is considered. 1 The universe is known to be asymmetric with respect to particles and antiparticles possessing, at least locally, non-zero baryonic and, possibly, leptonic charge density. On the other hand, it is commonly believed that cosmological electric asymmetry must be identically zero. The observational data allow for some small cosmological electric asymmetry [1], but theoretically it is very difficult or maybe even impossible to generate it without mod...

- by Diego N Pelliccia
- •
- Physics, Black Holes, Evaporation, Magnetic field
- by Maxim Khlopov
- •
- Data Analysis, Observational Cosmology, Dark Matter, Primordial Black Hole

Primordial Black Holes (PBHs) are of interest in many cosmological contexts. PBHs lighter than about 1012 kg are predicted to be directly detectable by their Hawking radiation. This radiation should produce both a diffuse extragalactic gamma-ray background from the cosmologically-averaged distribution of PBHs and gamma-ray burst signals from individual light black holes. The Fermi, Milagro, Veritas, HESS and HAWC observatories, in combination with new burst recognition methodologies, offer the greatest sensitivity for the detection of such black holes or placing limits on their existence.

- by Jane MacGibbon
- •
- Particle Physics, Galaxy Formation and Evolution, Early Universe, Ultraviolet
- by Maxim Khlopov
- •
- Particle Physics, Galaxy Formation and Evolution, Early Universe, Ultraviolet
- by Bibekananda Nayak
- •
- Field Theory, Quantum Physics, Thermodynamics, Black Hole
- by Nicolas Produit
- •
- Mathematical Physics, Quantum Physics, Dark Matter, Loop Quantum Gravity

We investigate higher dimensional cosmological models in the semiclassical approximation with Hartle-Hawking Boundary conditions, assuming a gravitational action which is described by the scalar curvature with a cosmological constant. In the framework the probability for quantum creation of an inflationary universe with a pair of black holes in a multidimensional universe is evaluated. The probability for creation of a universe with a spatial section with S1XSD−2S^{1}XS^{D -2}S1XSD−2 topology is then compared with that of a higher dimensional de Sitter universe with SD−1S^{D -1}SD−1 spatial topology. It is found that a higher dimensional universe with a product space with primordial black holes pair is less probable to nucleate when the extra dimensions scale factors do not vary in an inflating universe.

- by BIKASH CHANDRA PAUL
- •
- Mathematical Physics, Quantum Physics, Black Hole, Primordial Black Hole
- by Marshall Eubanks
- •
- Dark Matter, Primordial Black Hole, Formation of the Solar System, Quark Matter

In this small review we present the actual state the knowledge about weighting black holes. Black holes can be found in stellar binary systems in our Galaxy and in other nearby galaxies, in globular clusters, which we can see in our and nearby galaxies, and in centres of all well-developed galaxies. Range of values of their masses is wide and cover about ten orders of magnitude (not taking into account the hypothetic primordial black holes). Establishing the presence of black holes, and in particular the measurement of their mass is one on the key issues for many branches of astronomy, from stellar evolution to cosmology.

- by Bozena Czerny
- •
- Stellar Evolution, Black Hole, Primordial Black Hole

In this paper we summarise the status of single field models of inflation in light of the WMAP 7 data release. We find little has changed since the 5 year release, and results are consistent with previous findings. The increase in the upper bound on the running of the spectral index impacts on the status of the production of Primordial Black Holes from single field models. The lower bound on the equilateral configuration of the non-gaussianity parameter is reduced and thus the bounds on the theoretical parameters of (UV) DBI single brane models are weakened. In the case of multiple coincident branes the bounds are also weakened and the two, three or four brane cases will produce a tensor-signal that could possibly be observed in the future.

- by Ian Huston
- •
- Inflation, Primordial Black Hole, Lower Bound, Upper Bound

The capture of cold dark matter species, and especially primordial black holes, during the formation of gravitationally bound objects is analyzed. It is shown that the best conditions for an efficient gravitational capture were at the epoch preceding the galaxy formation, when the first astrophysical objects with masses of the order of Jeans mass 10(5-10^6 Msun) were forming. Black hole

- by Edgar Bugaev
- •
- Quantum Physics, Primordial Black Hole, Spectrum, Second Order
- by Edgar Bugaev
- •
- Gamma Ray Burst, Primordial Black Hole, Gamma Ray, Theoretical Model

Experimental data of arrays "Andyrchy" and "Carpet-2" of Baksan Neutrino Observatory (Institute for Nuclear Research), obtained in the regime of a detection of the single cosmic-ray component, are used for a search of the bursts of cosmic gamma rays from evaporating primordial black holes. Different theoretical models of the evaporation process are used for the analysis. Distributions of the counting rate fluctuations on both arrays agree with the expectations from the cosmic ray background. The new constraints on the concentration of evaporating primordial black holes in the local region of Galaxy are obtained. The comparison of the results of different experiments is given.

- by Edgar Bugaev
- •
- Primordial Black Hole, Gamma Ray, Experimental Data, Theoretical Model
- by Philip Argyres and +1
- •
- Particle Physics, Dark Matter, Gravitational Lensing, Standard Model

Incorporating a realistic model for accretion of ultrarelativistic particles by primordial black holes (PBHs), we study the evolution of an Einstein-de Sitter universe consisting of PBHs embedded in a thermal bath from the epoch ~10-33 sec to ~5×10-9 sec. In this paper we use the ansatz of Barrow et al. to model black hole evaporation in which the modified Hawking temperature goes to zero in the limit of the black hole attaining a relic state with a mass ~mPl. Both the single mass PBH case as well as the case in which black hole masses are distributed in the range 8×102-3×105 g have been considered in our analysis. Black holes with a mass larger than ~105 g appear to survive beyond the electroweak phase transition and, therefore, successfully manage to create baryon excess via X-X¯ emissions, averting the baryon number washout due to sphalerons. In this scenario, we find that the contribution to the baryon-to-entropy ratio by PBHs of initial mass m is given by ~ɛζ(m/1 g)-1, where ɛ and ζ are the CP-violating parameter and the initial mass fraction of the PBHs, respectively. For ɛ larger than ~10-4, the observed matter-antimatter asymmetry in the universe can be attributed to the evaporation of PBHs.

- by Niraj Upadhyay
- •
- Field Theory, Quantum Physics, Thermodynamics, CP Violation

We describe the model of protogalaxy formation around the cluster of primordial black holes with a minimum extension of standard cosmological model. Namely, it is supposed, that a mass fraction of the universe ~10^-3 is composed of the compact clusters of primordial (relict) black holes produced during the phase transitions in the early universe. These clusters are the centers of the dark matter (DM) condensations. As a result the protogalaxies with a mass 2x10^8Msun form at the redshift z=15. These induced protogalaxies contain the central black holes of mass ~10^5Msun and look like the dwarf spheroidal galaxies with a central density spike. Subsequent merging of the induced protogalaxies and ordinary DM haloes leads to the standard scenario of the large scale structure formation. Black holes merging gives the nowadays supermassive black holes and reproduces the observed correlations between their masses and velocity dispersions in the bulges.

- by Vyacheslav I Dokuchaev
- •
- Mathematical Physics, Physics, Theoretical Physics, Dark Matter