On September 14, 2015 at 09:50:45 UTC the two detectors of the Laser Interferometer Gravitational-Wave Observatory simultaneously observed a transient gravitational-wave signal. The signal sweeps upwards in frequency from 35 to 250 Hz with a peak gravitational-wave strain of 1.0×10(-21). It matches the waveform predicted by general relativity for the inspiral and merger of a pair of black holes and the ringdown of the resulting single black hole. The signal was observed with a matched-filter signal-to-noise ratio of 24 and a false alarm rate estimated to be less than 1 event per 203,000 years, equivalent to a significance greater than 5.1σ. The source lies at a luminosity distance of 410(-180)(+160)  Mpc corresponding to a redshift z=0.09(-0.04)(+0.03). In the source frame, the initial black hole masses are 36(-4)(+5)M⊙ and 29(-4)(+4)M⊙, and the final black hole mass is 62(-4)(+4)M⊙, with 3.0(-0.5)(+0.5)M⊙c(2) radiated in gravitational waves. All uncertainties define 90% credible intervals. These observations demonstrate the existence of binary stellar-mass black hole systems. This is the first direct detection of gravitational waves and the first observation of a binary black hole merger.

/pdf/the-observation-of-gravitational-waves-from-a-binary-black-58srpupgg9.pdf

The Observation of Gravitational Waves from a Binary Black Hole Merger

The possibility that the dark matter comprises primordial black holes (PBHs) is considered, with particular emphasis on the currently allowed mass windows at 10(16)-10(17) g, 10(20)-10(24) g and 1- ...

Primordial Black Holes as Dark Matter

Although the dark matter is usually assumed to be made up of some form of elementary particle, primordial black holes (PBHs) could also provide some of it. However, various constraints restrict the...

https://www.annualreviews.org/doi/pdf/10.1146/annurev-nucl-050520-125911

Primordial Black Holes as Dark Matter: Recent Developments

A significant amount of the research on two types of biases against women leaders—agentic deficiency (perceptions that women have minimal leadership potential) and agentic penalty (backlash for counter-stereotypical behavior)—has generally presumed that the descriptive, prescriptive, and proscriptive stereotypes on which the biases are based are comparable for women across racial groups. We propose that the degree to which agentic deficiencies and penalties occur is contingent on the dimension of agency that is under consideration and its relation to the stereotypes associated with the target's gendered and racial group. The results of our literature review and analysis suggest that when considered in the context of gender and leadership research, at least two dimensions of agency, competence and dominance, closely align with perceptions of agentic deficiency and agentic penalty, respectively. Based on our analysis and the prevalent stereotypes of Black and Asian American women that are likely most relevant to the two types of biases against women leaders, we examined the interactive effects of racial stereotypes and the agentic biases. We suggest that when specific racial and gendered stereotypes are aligned with a specific dimension of agency, we can gain a more thorough understanding of how agentic biases may hinder women's progression to leadership positions.

Race matters for women leaders: Intersectional effects on agentic deficiencies and penalties


 The existence of nonzero neutrino masses points to the likely existence of multiple Standard Model neutral fermions. When such states are heavy enough that they cannot be produced in oscillations, they are referred to as heavy neutral leptons (HNLs). In this white paper, we discuss the present experimental status of HNLs including colliders, beta decay, accelerators, as well as astrophysical and cosmological impacts. We discuss the importance of continuing to search for HNLs, and its potential impact on our understanding of key fundamental questions, and additionally we outline the future prospects for next-generation future experiments or upcoming accelerator run scenarios.

https://iopscience.iop.org/article/10.1088/1361-6471/ac98f9/pdf

The present and future status of heavy neutral leptons

Gas heating from spinning and non-spinning evaporating primordial black holes

False vacuum remnants in first-order phase transitions in the early Universe can form compact objects which may constitute dark matter. Such remnants form because particles develop large mass gaps between the two phases and become trapped in the old phase. We focus on remnants generated in a class of models with trapped dark sector particles, trace their development, and determine their ultimate fate. Depending on model and phase transition parameters, the evolutionary endpoint of these remnants can be primordial black holes, Fermi-balls, Q-balls, or thermal balls, and they all have the potential to constitute some portion or the whole of dark matter within a broad mass range. Notably, dark sector thermal balls can remain at high temperatures until the present day and are a new compact dark matter candidate which derives its energy from the thermal energy of internal particles instead of their mass or quantum pressure.

/pdf/first-order-phase-transition-and-fate-of-false-vacuum-1quq11ff.pdf

First-order phase transition and fate of false vacuum remnants

Interstellar gas heating is a powerful cosmology-independent observable for exploring the parameter space of primordial black holes (PBHs) formed in the early Universe that could constitute part of the dark matter (DM). We provide a detailed analysis of the various aspects for this observable, such as PBH emission mechanisms. Using observational data from the Leo T dwarf galaxy, we constrain the PBH abundance over a broad mass-range, $M_{\rm PBH} \sim \mathcal{O}(1) M_{\odot}-10^7 M_{\odot}$, relevant for the recently detected gravitational wave signals from intermediate-mass BHs. We also consider PBH gas heating of systems with bulk relative velocity with respect to the DM, such as Galactic clouds.

Interstellar Gas Heating by Primordial Black Holes

Addendum: Cosmological dependence of non-resonantly produced sterile neutrinos Addendum: Cosmological dependence of non-resonantly produced sterile neutrinos

First-order phase transitions (FOPTs) are usually described by the nucleation and expansion of new phase bubbles in the old phase background. While the dynamics of new phase bubbles have been extensively studied, a comprehensive treatment of the shrinking old phase remnants remained undeveloped. We present a novel formalism for remnant statistics in FOPTs and perform the ﬁrst calculations of their distribution. By shifting to the reverse time description, we identify the shrinking remnants with expanding old phase bubbles, allowing a quantitative evolution and determination of the population statistics. Our results not only provide essential input for cosmological FOPT-induced soliton/primordial black hole formation scenarios, but can also be readily applied to generic FOPTs.

Old phase remnants in first-order phase transitions

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