17 research outputs found
On a Geometric Locus in Taxicab Geometry
Abstract. In axiomatic geometry, the taxicab model of geometry is important as an example of a geometry where the SAS Postulate does not hold. Some properties that hold true in Euclidean geometry are not true in taxicab geometry. For this reason, it is important to understand what happens with various classes of geometric loci in taxicab geometry. In the present study, we focus on a geometric locus question inspired by a problem originally posed by Ţ iţeica in the Euclidean context; our study presents the solution to this question in the taxicab plane
On Detecting Interstellar Scintillation in Narrowband Radio SETI
To date, the search for radio technosignatures has focused on sky location as
a primary discriminant between technosignature candidates and anthropogenic
radio frequency interference (RFI). In this work, we investigate the
possibility of searching for technosignatures by identifying the presence and
nature of intensity scintillations arising from the turbulent, ionized plasma
of the interstellar medium (ISM). Past works have detailed how interstellar
scattering can both enhance and diminish the detectability of narrowband radio
signals. We use the NE2001 Galactic free electron density model to estimate
scintillation timescales to which narrowband signal searches would be
sensitive, and discuss ways in which we might practically detect strong
intensity scintillations in detected signals. We further analyze the RFI
environment of the Robert C. Byrd Green Bank Telescope (GBT) with the proposed
methodology and comment on the feasibility of using scintillation as a filter
for technosignature candidates.Comment: 17 pages, 8 figures, published by Ap
A Simultaneous Dual-site Technosignature Search Using International LOFAR Stations
The Search for Extraterrestrial Intelligence aims to find evidence of
technosignatures, which can point toward the possible existence of
technologically advanced extraterrestrial life. Radio signals similar to those
engineered on Earth may be transmitted by other civilizations, motivating
technosignature searches across the entire radio spectrum. In this endeavor,
the low-frequency radio band has remained largely unexplored; with prior radio
searches primarily above 1 GHz. In this survey at 110-190 MHz, observations of
1,631,198 targets from TESS and Gaia are reported. Observations took place
simultaneously with two international stations (noninterferometric) of the Low
Frequency Array in Ireland and Sweden. We can reject the presence of any
Doppler drifting narrowband transmissions in the barycentric frame of
reference, with equivalent isotropic radiated power of 10 17 W, for 0.4 million
(or 1.3 million) stellar systems at 110 (or 190) MHz. This work demonstrates
the effectiveness of using multisite simultaneous observations for rejecting
anthropogenic signals in the search for technosignatures.Comment: 15 Pages, 16 Figures, 2 Machine Readable Table
bbrzycki/setigen: v2.6.1
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<li>Fix rng.normal syntax to standard_normal - cupy doesn't have normal() implemented</li>
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