Periodic Spectral Modulations Arise from Nonrandom Spacing of Spectral Absorption Lines

Hippke, Michael

doi:10.1088/1538-3873/aafbac

Cited by 3 publications

(1 citation statement)

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“…This would show up as a periodic signal when the spectrum was Fourier transformed. Indeed, such signals were observed (Borra & Trottier 2016), but their origin is yet to be established with Hippke (2019), postulating that they arise from nonrandom spectral absorption features. Leeb et al (2013) considered detecting periodic pulsed signals in the temporal domain, but ruled out looking for continuous signals: "We rule out a continuous signal (i.e., zero modulation), as this cannot easily be discriminated against natural light sources."…”

Section: Introductionmentioning

confidence: 99%

A Proposed Method for a Photon-counting Laser Coherence Detection System to Complement Optical SETI

Benton

2019

PASP

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The detection of laser radiation originating from space is a positive indicator of Extra Terrestrial Intelligence (ETI). Thus far the optical search for ETI (OSETI) has looked for enhanced brightness in the form of either narrow-band spectral emission or time correlated photons from laser pulses. In this paper it is proposed to look for coherence properties of incoming light in a manner that can distinguish against atomic emission lines. The use of photon sensitive detectors and a modulating asymmetric interferometer has been modelled. The results suggest that the sensitivity of detection for continuous laser sources would be better than current spectroscopic approaches, with detection thresholds of <1 photon s −1 m −2 against a background with a spectral bandwidth of 0.1nm over an observation time of 750s. photon detection, coherence, SETI arXiv:1902.05371v3 [astro-ph.IM]

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Section: Introductionmentioning

confidence: 99%

A Proposed Method for a Photon-counting Laser Coherence Detection System to Complement Optical SETI

Benton

2019

PASP

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Ultrafast Modulations in Stellar, Solar and Galactic Spectra: Dark Matter and Numerical Ghosts, Stellar Flares and SETI

Tamburini,

Licata

2024

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Background: - From new results presented in the literature we discuss the hypothesis, presented in an our previous work, that the ultrafast periodic spectral modulations at fS=0.607±0.08 THz found in the spectra of 236 stars of the Sloan Digital Sky Survey (SDSS) were due to oscillations induced by dark matter (DM) cores in their centers that behave as oscillating boson stars. Two other frequencies were found by Borra in the redshift-corrected SDSS galactic spectra, f1,G=9.71−0.19+0.20 THz and f2,G=9.17−0.16+0.18 THz; the latter was then shown by Hippke to be a spurious frequency introduced by the data analysis procedure. Results: - Within the experimental errors, the frequency f1,G is the beating of the two frequencies, the spurious one, f2,G and fS that was also independently detected in a real solar spectrum, but not in the Kurucz’s artificial solar spectrum by Hippke, suggesting that fS could actually be a real frequency. Independent SETI observations by Isaacson et al., taken at different epochs, of four of these 236 stars could not confirm with high confidence - without completely excluding - the presence of fS in their power spectra and with the same power initially observed. Instead, the radio SETI deep-learning analysis with artificial intelligence (AI) gave an indirect confirmation of the presence of fS through the detection of a narrowband Doppler drifting of the observed radio signals in two stars, over a sample of 7 with a high S/N. These two stars belong to the set of the 236 SDSS stars. Numerical simulations confirm that this drifting can be due to frequency and phase modulation in time of the observed frequencies (1.3–1.7 GHz) with fS. Conclusions: - Assuming the DM hypothesis, the upper mass limit of the axion-like DM particle is ma≃2.4×103μeV, in agreement with the results from the gamma ray burst GRB221009A, laser interferometry experiments, suggesting new physics with additional axion-like particle fields for the muon g-2 anomaly.

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Searching for Interstellar Quantum Communications

Hippke

2021

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The modern search for extraterrestrial intelligence began with the seminal publications of Cocconi & Morrison and Schwartz & Townes, who proposed searching for narrowband signals in the radio spectrum and optical laser pulses. Over the last six decades, more than 100 dedicated search programs have targeted these wavelengths, all with null results. All of these campaigns searched for classical communications, that is, for a significant number of photons above a noise threshold, with the assumption of a pattern encoded in time and/or frequency space. I argue that future searches should also target quantum communications. They are preferred over classical communications with regard to security and information efficiency, and they would have escaped detection in all previous searches. The measurement of Fock state photons or squeezed light would indicate the artificiality of a signal. I show that quantum coherence is feasible over interstellar distances and explain for the first time how astronomers can search for quantum transmissions sent by ETI to Earth using commercially available telescopes and receiver equipment.

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Periodic Spectral Modulations Arise from Nonrandom Spacing of Spectral Absorption Lines

Cited by 3 publications

References 28 publications

A Proposed Method for a Photon-counting Laser Coherence Detection System to Complement Optical SETI

A Proposed Method for a Photon-counting Laser Coherence Detection System to Complement Optical SETI

Ultrafast Modulations in Stellar, Solar and Galactic Spectra: Dark Matter and Numerical Ghosts, Stellar Flares and SETI

Searching for Interstellar Quantum Communications

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