QUBIC: Exploring the Primordial Universe with the Q&U Bolometric Interferometer

In this paper, we describe QUBIC, an experiment that will observe the polarized microwave sky with a novel approach, which combines the sensitivity of state-of-the-art bolometric detectors with the systematic effects control typical of interferometers. QUBIC’s unique features are the so-called “self-calibration”, a technique that allows us to clean the measured data from instrumental effects, and its spectral imaging power, i.e., the ability to separate the signal into various sub-bands within each frequency band. QUBIC will observe the sky in two main frequency bands: 150 GHz and 220 GHz. A technological demonstrator is currently under testing and will be deployed in Argentina during 2019, while the final instrument is expected to be installed during 2020

Implementation of push notification using SignalR and WCF

Komunikacijo med strežniki in odjemalci lahko realiziramo na več načinov. Osnoven način je, da odjemalec povprašuje in strežnik odgovarja. V primeru, ko odjemalec ne ve, kdaj mu bo določena informacija na voljo, mora v intervalih spraševati strežnik. To je neučinkovito in boljša alternativa temu je, da strežnik obvešča odjemalce. Takemu načinu komunikacije pravimo potisno obveščanje. Implementacijo potisnega obveščanja smo izvedli s knjižnico SignalR in z ogrodjem WCF. Obe tehnologiji smo raziskali in ju primerjali. Za primerjavo tehnologij smo implementirali obveščanje o dogajanju v nadzoru različic kode. V našem primeru smo imeli dva tipa odjemalcev. En odjemalec je vmesnik za upravljanje z nadzorom različic kode Git. Ta obvešča strežnik o akcijah, ki se dogajajo nad kodo. Drugi tip odjemalca pa je namizna aplikacija in aplikacija za Windows Phone 8. Obe aplikaciji sprejemata obvestila o dogajanju v nadzoru različic kode, ki jim jih pošilja strežnik.Communication between servers and clients can be realised in several ways. A basic method is, when the client requests and the server responds. In case the client does not know, when the specific information will be available, it needs to ask the server in intervals. This is ineffective, and a better alternative is when the server informs the clients. Such communication is called server push. Server push was implemented with the SignalR library and with the WCF framework. Both technologies have been explored and compared. For comparison of technologies we implemented the notification of activity in revision control. In our case, we had two types of clients. The first client is an interface for managing the control of the Git revision control. It informs the server about actions, which take place over the code. The second client is a desktop application and an application for Windows Phone 8. Both applications receive notifications of activities in revision control

Observation of Gravitational Waves from the Coalescence of a 2.5–4.5 M _⊙ Compact Object and a Neutron Star

Abstract We report the observation of a coalescing compact binary with component masses 2.5–4.5 M ⊙ and 1.2–2.0 M ⊙ (all measurements quoted at the 90% credible level). The gravitational-wave signal GW230529_181500 was observed during the fourth observing run of the LIGO–Virgo–KAGRA detector network on 2023 May 29 by the LIGO Livingston observatory. The primary component of the source has a mass less than 5 M ⊙ at 99% credibility. We cannot definitively determine from gravitational-wave data alone whether either component of the source is a neutron star or a black hole. However, given existing estimates of the maximum neutron star mass, we find the most probable interpretation of the source to be the coalescence of a neutron star with a black hole that has a mass between the most massive neutron stars and the least massive black holes observed in the Galaxy. We provisionally estimate a merger rate density of 55 − 47 + 127 Gpc − 3 yr − 1 for compact binary coalescences with properties similar to the source of GW230529_181500; assuming that the source is a neutron star–black hole merger, GW230529_181500-like sources may make up the majority of neutron star–black hole coalescences. The discovery of this system implies an increase in the expected rate of neutron star–black hole mergers with electromagnetic counterparts and provides further evidence for compact objects existing within the purported lower mass gap.</jats:p