Formation of MACHO-Primordial Black Holes in Inflationary Cosmology

نویسنده

  • Jun’ichi Yokoyama
چکیده

As a nonbaryonic explanation of massive compact halo objects, a phenomenological model is presented which predicts formation of primordial black holes at a desired mass scale. The required feature of initial density fluctuation is realized making use of the primordially isocurvature fluctuation generated in an inflationary universe model with multiple scalar fields.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Formation of intermediate-mass black holes as primordial black holes in the inflationary cosmology with running spectral index

Formation of primordial black holes (PBHs) on astrophysical mass scales is a natural consequence of inflationary cosmology if the primordial perturbation spectrum has a large and negative running of the spectral index as observationally suggested today, because double inflation is required to explain it and fluctuations on some astrophysical scales are enhanced in the field oscillation regime i...

متن کامل

Black hole formation in the Friedmann universe: Formulation and computation in numerical relativity

The formation of black holes in the early universe and its cosmological implications have been discussed in a variety of contexts for decades [1]. However, it has long been thought that it would be practically impossible to prove or disprove the existence of these primordial black holes. Recent discoveries of microlensing events by MACHOs of mass ∼ 0.5M in the halo of our galaxy [2] have dramat...

متن کامل

Primordial black holes in braneworld cosmologies: Formation, cosmological evolution, and evaporation

We consider the population evolution and evaporation of primordial black holes in the simplest braneworld cosmology: Randall-Sundrum type II. We demonstrate that black holes forming during the high-energy phase of this theory ~where the expansion rate is proportional to the density! have a modified evaporation law, resulting in a longer lifetime and lower temperature at evaporation, while those...

متن کامل

Primordial Black Holes as Dark Matter: the Power Spectrum and Evaporation of Early Structures

We consider the possibility that massive primordial black holes are the dominant form of dark matter. Black hole formation generates entropy fluctuations that adds a Poisson noise to the matter power spectrum. We use Ly-α forest observations to constrain this Poisson term in matter power spectrum, then we constrain the mass of black holes to be less than ∼ few × 10 M⊙. We also find that structu...

متن کامل

Advances in Black Hole Physics and Dark Matter Modelling of the Galactic Halo Primordial Black Holes and Galactic Formation

One of the most important unresolved issues of modern physics is the presence of cold dark matter (CDM). Such dark matter appears to be essential in explaining the observed galactic rotation curves and the missing Cosmological dark matter. Recent attention has focused on galactic halos as an explanation of the galactic rotation curves, and on the possibility that galactic halos may consist of m...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 1995