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Non-trivial solution to a simple problem 简单问题的非线性解决方案
arXiv - PHYS - Popular Physics Pub Date : 2024-04-15 DOI: arxiv-2405.00050
A. I. Milstein
{"title":"Non-trivial solution to a simple problem","authors":"A. I. Milstein","doi":"arxiv-2405.00050","DOIUrl":"https://doi.org/arxiv-2405.00050","url":null,"abstract":"The problem of finding the frequencies of small longitudinal oscillations of\u0000a spring having a finite mass and stiffness, attached at one end to a wall and\u0000at the other end to a body of finite mass, is discussed. This problem was\u0000repeatedly proposed at Olympiads for schoolchildren, in various lessons on the\u0000Internet, and even on tests in mechanics for students of universities. In all\u0000the cases known to me, the implied solution was actually wrong. I discuss two\u0000cases: (A) a spring lies on a smooth table, (B) a spring is attached to the\u0000ceiling. It is shown that the solution to this simply formulated problem is\u0000non-trivial.","PeriodicalId":501348,"journal":{"name":"arXiv - PHYS - Popular Physics","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140836356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Necessary Conditions for Earthly Life Floating in the Venusian Atmosphere 地球生命漂浮在金星大气层中的必要条件
arXiv - PHYS - Popular Physics Pub Date : 2024-04-08 DOI: arxiv-2404.05356
Jennifer J. Abreu, Alyxander R. Anchordoqui, Nyamekye J. Fosu, Michael G. Kwakye, Danijela Kyriakakis, Krystal Reynoso, Luis A. Anchordoqui
{"title":"Necessary Conditions for Earthly Life Floating in the Venusian Atmosphere","authors":"Jennifer J. Abreu, Alyxander R. Anchordoqui, Nyamekye J. Fosu, Michael G. Kwakye, Danijela Kyriakakis, Krystal Reynoso, Luis A. Anchordoqui","doi":"arxiv-2404.05356","DOIUrl":"https://doi.org/arxiv-2404.05356","url":null,"abstract":"Millimeter-waveband spectra of Venus from both the James Clerk Maxwell\u0000Telescope (JCMT) and the Atacama Large Millimeter/submillimeter Array (ALMA)\u0000provide conclusive evidence (signal-to-noise ratio of about $15sigma$) of a\u0000phosphine absorption-line profile against the thermal background from deeper,\u0000hotter layers of the atmosphere. Phosphine is an important biomarker; e.g., the\u0000trace of phosphine in the Earth's atmosphere is uniquivocally associated with\u0000anthropogenic activity and microbial life (which produces this highly reducing\u0000gas even in an overall oxidizing environment). Motivated by the JCMT and ALMA\u0000tantalizing observations we reexamine whether Venus could accommodate Earthly\u0000life. More concretly, we hypothesize that the microorganisms populating the\u0000venusian atmosphere are not free floating but confined to the liquid\u0000environment inside cloud aerosols or droplets. Armed with this hypothesis, we\u0000generalize a study of airborne germ transmission to constrain the maximum size\u0000of droplets that could be floating in the venusian atmosphere and estimate\u0000whether their Stokes fallout times to reach moderately high temperatures are\u0000pronouncedly larger than the microbe's replication time. We also comment on the\u0000effect of cosmic ray showers on the evolution of aerial microbial life.","PeriodicalId":501348,"journal":{"name":"arXiv - PHYS - Popular Physics","volume":"300 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140599590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Is Artificial Intelligence the great filter that makes advanced technical civilisations rare in the universe? 人工智能是使先进技术文明在宇宙中罕见的伟大过滤器吗？
arXiv - PHYS - Popular Physics Pub Date : 2024-04-01 DOI: arxiv-2405.00042
Michael Garrett
{"title":"Is Artificial Intelligence the great filter that makes advanced technical civilisations rare in the universe?","authors":"Michael Garrett","doi":"arxiv-2405.00042","DOIUrl":"https://doi.org/arxiv-2405.00042","url":null,"abstract":"This study examines the hypothesis that the rapid development of Artificial\u0000Intelligence (AI), culminating in the emergence of Artificial Superintelligence\u0000(ASI), could act as a \"Great Filter\" that is responsible for the scarcity of\u0000advanced technological civilisations in the universe. It is proposed that such\u0000a filter emerges before these civilisations can develop a stable,\u0000multiplanetary existence, suggesting the typical longevity (L) of a technical\u0000civilization is less than 200 years. Such estimates for L, when applied to\u0000optimistic versions of the Drake equation, are consistent with the null results\u0000obtained by recent SETI surveys, and other efforts to detect various\u0000technosignatures across the electromagnetic spectrum. Through the lens of SETI,\u0000we reflect on humanity's current technological trajectory - the modest\u0000projections for L suggested here, underscore the critical need to quickly\u0000establish regulatory frameworks for AI development on Earth and the advancement\u0000of a multiplanetary society to mitigate against such existential threats. The\u0000persistence of intelligent and conscious life in the universe could hinge on\u0000the timely and effective implementation of such international regulatory\u0000measures and technological endeavours.","PeriodicalId":501348,"journal":{"name":"arXiv - PHYS - Popular Physics","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140836351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A proposal for enhancing technosignature search toward the Galactic center 加强银河中心技术信号搜索的建议
arXiv - PHYS - Popular Physics Pub Date : 2024-04-01 DOI: arxiv-2404.00840
Naoki Seto
{"title":"A proposal for enhancing technosignature search toward the Galactic center","authors":"Naoki Seto","doi":"arxiv-2404.00840","DOIUrl":"https://doi.org/arxiv-2404.00840","url":null,"abstract":"We discuss the possibility of enhancing intelligent life searches toward the\u0000Galactic center. From the clockwork orbital motions of stars around the Sgr\u0000A${}^*$ black hole, we can determine the distance to the Galactic center at an\u0000exceptional accuracy, despite its remoteness $sim 8.3$kpc. In addition, we can\u0000define precise reference epochs by selecting a prominent object such as the\u0000bright B-type star S2. These properties have a particular affinity for the\u0000coordinated signaling scheme which was hypothesized by Seto (2019) for\u0000systematically connecting intentional senders to searchers without a prior\u0000communication. If S2 is actually being used as a common reference clock, we can\u0000compress the search directions around the Galactic center by more than two\u0000orders of magnitude, with the scanning interval of $sim16$yr.","PeriodicalId":501348,"journal":{"name":"arXiv - PHYS - Popular Physics","volume":"244 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140599560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The ancient Egyptian personification of the Milky Way as the Sky Goddess Nut: an astronomical and cross-cultural analysis 古埃及人将银河拟人化为天空女神努特：天文学和跨文化分析
arXiv - PHYS - Popular Physics Pub Date : 2024-04-01 DOI: arxiv-2404.01458
Or Graur
{"title":"The ancient Egyptian personification of the Milky Way as the Sky Goddess Nut: an astronomical and cross-cultural analysis","authors":"Or Graur","doi":"arxiv-2404.01458","DOIUrl":"https://doi.org/arxiv-2404.01458","url":null,"abstract":"The Milky Way's name and role in ancient Egyptian culture remain unclear. One\u0000suggestion is that the Milky Way may have been a celestial depiction of the sky\u0000goddess Nut. In this work, I test this association using an interdisciplinary\u0000approach. In the first part of this paper, I combine astronomical simulations\u0000of the ancient Egyptian night sky with primary Egyptian sources to map the\u0000goddess Nut onto the Milky Way. With her head and groin firmly associated by\u0000primary texts with the western and eastern horizons, respectively, I argue that\u0000the summer and winter orientations of the Milky Way could be construed as\u0000figurative markers of Nut's torso (or backbone) and her arms, respectively. In\u0000the second part of this paper, I situate Nut within the global, multicultural\u0000mythology of the Milky Way. Specifically, I show that Nut's roles in the\u0000afterlife and the autumn bird migration are consistent with similar roles\u0000attributed to the Milky Way by other cultures. Finally, I show that Nut's\u0000identification with the Milky Way may even have echoes in contemporary African\u0000conceptions of the Galaxy.","PeriodicalId":501348,"journal":{"name":"arXiv - PHYS - Popular Physics","volume":"72 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140599588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On the Superiority of the University of Arizona's Physics Club 论亚利桑那大学物理俱乐部的优越性
arXiv - PHYS - Popular Physics Pub Date : 2024-04-01 DOI: arxiv-2404.00975
E. Jesina, M. Harrison, H. Andras-Letanovszky, D. Krug, A. Golinkin, B. Kohn, T. Brown, A. Rose, P. Chiploonkar
{"title":"On the Superiority of the University of Arizona's Physics Club","authors":"E. Jesina, M. Harrison, H. Andras-Letanovszky, D. Krug, A. Golinkin, B. Kohn, T. Brown, A. Rose, P. Chiploonkar","doi":"arxiv-2404.00975","DOIUrl":"https://doi.org/arxiv-2404.00975","url":null,"abstract":"We present an analysis on Physics Club's supremacy over the Astronomy Club at\u0000the University of Arizona. Through a thorough investigation of each club's\u0000history and content, and subsequent diligent calculations, we have proven\u0000without a doubt that the Physics Club is superior to Astronomy Club.","PeriodicalId":501348,"journal":{"name":"arXiv - PHYS - Popular Physics","volume":"2010 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140599610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
I'm in AGNi: A new standard for AGN pluralisation 我在 AGNi：AGN 复数化的新标准
arXiv - PHYS - Popular Physics Pub Date : 2024-03-29 DOI: arxiv-2403.20302
Andrew D. Gow, Peter Clark, Dan Rycanowski
{"title":"I'm in AGNi: A new standard for AGN pluralisation","authors":"Andrew D. Gow, Peter Clark, Dan Rycanowski","doi":"arxiv-2403.20302","DOIUrl":"https://doi.org/arxiv-2403.20302","url":null,"abstract":"We present a new standard acronym for Active Galactic Nuclei, finally\u0000settling the argument of AGN vs. AGNs. Our new standard is not only\u0000etymologically superior (following the consensus set by SNe), but also boasts\u0000other linguistic opportunities, connecting strongly with relevant theology and\u0000streamlining descriptions of AGN properties.","PeriodicalId":501348,"journal":{"name":"arXiv - PHYS - Popular Physics","volume":"57 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140599608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Species Syzygy: Which Animal Has Seen the Most Total Solar Eclipses? 物种对称：哪种动物经历的日全食次数最多？
arXiv - PHYS - Popular Physics Pub Date : 2024-03-29 DOI: arxiv-2403.20175
Mark Popinchalk
{"title":"Species Syzygy: Which Animal Has Seen the Most Total Solar Eclipses?","authors":"Mark Popinchalk","doi":"arxiv-2403.20175","DOIUrl":"https://doi.org/arxiv-2403.20175","url":null,"abstract":"A Total Solar Eclipse (TSE) is a shocking and sublime experience. In just a\u0000week hundreds of millions of Homo Sapiens will attempt to see the 2024 eclipse\u0000as it stretches across the North American continent. However, while Homo\u0000Sapiens may be uniquely positioned to understand and predict eclipses, they are\u0000not the only species capable of observing them. The precise alignment of the\u0000Moon, Earth and Sun all existed well before humans. In the same way we share\u0000this planet capable of hosting life, the fantastic astronomical experiences\u0000available on it are not exclusive either. We present a framework to calculate\u0000the number of Total Solar Eclipses experienced by a species at any point in\u0000Earth's history. This includes factoring in the evolution of the Sun-Moon-Earth\u0000system, the duration the species is extant, and average population. We\u0000normalize over the geographic range by calculating an Astronomical World\u0000Eclipse Surface cOverage MEtric (AWESOME) time. To illustrate this framework we\u0000look at the case study of the family Limulidae (Horseshoe Crabs) and estimate\u0000the number of individuals that have seen an eclipse. We compare it to the\u0000number of current Homo Sapiens that view eclipses, and predict if it is\u0000possible for another species to take the ''top'' spot before the final total\u0000solar eclipse in ~ 380 million years.","PeriodicalId":501348,"journal":{"name":"arXiv - PHYS - Popular Physics","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140599558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Vulcan: Retreading a Tired Hypothesis with the 2024 Total Solar Eclipse 火神用 2024 年日全食重提一个老生常谈的假设
arXiv - PHYS - Popular Physics Pub Date : 2024-03-29 DOI: arxiv-2403.20281
Michael B. Lund
{"title":"Vulcan: Retreading a Tired Hypothesis with the 2024 Total Solar Eclipse","authors":"Michael B. Lund","doi":"arxiv-2403.20281","DOIUrl":"https://doi.org/arxiv-2403.20281","url":null,"abstract":"The number of planets in the solar system over the last three centuries has,\u0000perhaps surprisingly, been less of a fixed value than one would think it should\u0000be. In this paper, we look at the specific case of Vulcan, which was both a\u0000planet before Pluto was a planet and discarded from being a planet before Pluto\u0000was downgraded. We examine the historical context that led to its discovery in\u0000the 19th century, the decades of observations that were taken of it, and its\u0000eventual fall from glory. By applying a more modern understanding of\u0000astrophysics, we provide multiple mechanisms that may have changed the orbit of\u0000Vulcan sufficiently that it would have been outside the footprint of early 20th\u0000century searches for it. Finally, we discuss how the April 8, 2024 eclipse\u0000provides a renewed opportunity to rediscover this lost planet after more than a\u0000century of having been overlooked.","PeriodicalId":501348,"journal":{"name":"arXiv - PHYS - Popular Physics","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140599899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Maximum Expected Reward Line If Non Specialist -- Law (for darts) 非专家情况下的最高预期奖励线 -- 法律（飞镖）
arXiv - PHYS - Popular Physics Pub Date : 2024-03-29 DOI: arxiv-2403.20060
Merlin Füllgraf, Jochen Gemmer
{"title":"Maximum Expected Reward Line If Non Specialist -- Law (for darts)","authors":"Merlin Füllgraf, Jochen Gemmer","doi":"arxiv-2403.20060","DOIUrl":"https://doi.org/arxiv-2403.20060","url":null,"abstract":"Different levels of expertise in playing darts can be well described simply\u0000by the likeliness of a player to really hit the field he is aiming for. We\u0000characterise this ability by introducing a spread to hit the targeted field\u0000whose width scales inversely with the players skill and determine which field\u0000to aim for to find the highest expectation value for the score depending on the\u0000players' proficiency.","PeriodicalId":501348,"journal":{"name":"arXiv - PHYS - Popular Physics","volume":"103 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140599586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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