Results 121 to 130 of about 38,917 (207)

Cosmological Constraints from Primordial Black Holes

, 1998
Primordial black holes may form in the early Universe, for example from the collapse of large amplitude density perturbations predicted in some inflationary models.
Andrew R Liddle, Anne M Green, Barrow, Bullock, Carr, Green, Green, Ivanov, Lindley, Lyth   +9 more
core   +2 more sources

Probability for Primordial Black Holes in Multidimensional Universe with Nonlinear Scalar Curvature Terms

, 2008
We investigate multi-dimensional universe with nonlinear scalar curvature terms to evaluate the probability of creation of primordial black holes. For this we obtain Euclidean instanton solution in two different topologies: (a) $S^{D-1}$ - topology which
A. Saha, B. C. Paul, H. Nariai, S. Ghose, T. Kaluza, V. B. Petkov   +5 more
core   +1 more source

Primordial black holes from first-order cosmological phase transitions

Physics Letters B
We discuss the possibility of forming primordial black holes during a first-order phase transition in the early Universe. As is well known, such a phase transition proceeds through the formation of true-vacuum bubbles in a Universe that is still in a ...
Michael J. Baker, Moritz Breitbach, Joachim Kopp, Lukas Mittnacht   +3 more
doaj   +1 more source

Primordial black hole minimum mass

Physical Review D, 2006
In this paper we revisit thermodynamic constraints on primordial black hole (PBH) formation in the early universe. Under the assumption that PBH mass is equal to the cosmological horizon mass, one can use the 2nd Law of Thermodynamics to put a lower limit on the PBH mass.
openaire   +2 more sources

Primordial Black Hole Clusters and their Evolution

, 2013
Contribution to the proceedings of the 16th Workshop "What Comes Beyond the Standard Models", Bled, July 14-21 ...
Chasnikov, N. A., Khlopov, Maxim Yu.
openaire   +3 more sources

Galaxy Formation from the Primordial Black Holes

EPJ Web of Conferences, 2017
Supermassive black hole (SMBH) of size MBH = 106-10M⊙ is common in the Universe and it defines the center of the galaxy. A galaxy and the SMBH are generally thought to have co-evolved.
Morikawa Masahiro
doaj   +1 more source

Clusters of PBHs in a Framework of Multidimensional f(R)-Gravity

Particles
We investigate primordial black hole (PBH) production via the collapse of supercritical domain walls in a quadratic f(R)-gravity model with tensor extensions.
Maxim Krasnov, Valery Nikulin
doaj   +1 more source

Non-canonical inflation and primordial black holes production

Physics Letters B, 2019
We study a mechanism for the amplification of the inflationary scalar perturbation when the inflaton field action is non-canonical, i.e. the inflaton kinetic term has a non-standard form.
Alexander Y. Kamenshchik, Alessandro Tronconi, Tereza Vardanyan, Giovanni Venturi   +3 more
doaj   +1 more source

Antinuclei from primordial black holes

Physical Review D
Light primordial black holes (PBHs) may have originated in the early Universe, and could contribute to the dark matter in the Universe. Their Hawking evaporation into particles could eventually lead to the production of antinuclei, which propagate and arrive at Earth as cosmic rays with a flux peaked at GeV energies.
Valentina De Romeri, Fiorenza Donato, David Maurin, Lorenzo Stefanuto, Agnese Tolino   +4 more
openaire   +4 more sources

Evolution of primordial black holes in Jordan-Brans-Dicke cosmology

, 2008
We consider the evolution of primordial black holes in a generalyzed Jordan-Brans-Dicke cosmological model where both the Brans-Dicke scalar field and its coupling to gravity are dynamical functions determined from the evolution equations.
A. S. Majumdar, Appelquist T., Carr B. J., Carr B. J., Carr B. J., D. Gangopadhyay, Gasperini M., Hawking S. W., L. P. Singh, Majumdar A. S., Will C. M., Zeldovich Ya B., Zeldovich Ya B.   +12 more
core   +2 more sources