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The R.A.P.Project "Prosto o slozhnom" "Astro-ph za 2006 g." Nemnogo statistiki Predydushii vypusk (N156) Slovar' astroterminov Spisok missii i teleskopov Obzory UFN Stat'i SOZh Moi stat'i v "Vokrug sveta" ANKa Dnya 14.03.2007. Taina kolec sverhnovoi 06.03.2007. BL Lac v zhestkom gamma 21.09.2006. Vspyshka vnegalakticheskogo magnitara ili korotkii gamma-vsplesk? 23.08.2006. Chernaya koshka obnaruzhena 13.04.2006. On bol'she Plutona! 07.04.2006. Disk vokrug anomal'nogo pul'sara 29.03.2006. Samyi dalekii gamma-vsplesk: mesto rozhdeniya 22.03.2006. Vega krutitsya volchkom 21.03.2006. Tri goda raboty WMAP 03.03.2006. S chem mozhno pereputat' sverhnovuyu? Soderzhanie i bystryi perehod k razdelam obzora Stat'i nedeli "Luchshie iz luchshih" arxiv/0705.0164 Inflyacionnaya kosmologiya arxiv/0705.0605 TYC 1031 012262 1: Pervaya galakticheskaya zatmennaya dvoinaya s cefeidoi tipa II arxiv/0705.1011 Otkrytie odinochnogo kompaktnogo ob'ekta na bol'shoi galakticheskoi shirote Otdel'nye stat'i Vysokochastotnye QPO u neitronnyh zvezd i chernyh dyr: zondirovanie plotnogo veshestva i sil'nyh gravitacionnyh polei Skromnoe predlozhenie astronomicheskomu soobshestvu Inflyacionnaya kosmologiya Trebuetsya li modificirovannaya gravitaciya po dannym nablyudenii? Novyi analiz dodekaedricheskoi modeli Puankare TYC 1031 012262 1: Pervaya galakticheskaya zatmennaya dvoinaya s cefeidoi tipa II Poiski aksionov v proshlom, nastoyashem i blizhaishem budushem Tevnye gamma-istochniki po rezul'tatam obzora galakticheskoi ploskosti na Milagro Rentgenovskii taiming PSR J1852+0040 v Kesteven 79: ukazanie na neitronnuyu zvezdu, slabozamagnichennuyu pri rozhdenii Otkrytie odinochnogo kompaktnogo ob'ekta na bol'shoi galakticheskoi shirote Stolknovenie mezhdu Mlechnym putem i Andromedoi Mnogoletnii poisk diffuznogo potoka neitrino na AMANDA-II Nablyudeniya oscillyacii solnechnogo tipa Para v Volopase: Novyi sputnik Galaktiki MAGMA: trehmernyi lagranzhevyi magnitogidrodinamicheskii kod dlya rascheta sliyanii Sverhmassivnye chernye dyry Iz razdela physics Relyativistskii tennis s fotonami Net puti nazad: maksimizaciya vremeni zhizni pod shvarcshil'dovskim gorizontom sobytii Mnenie Fermi ob identichnosti chastic Polnyi Arhiv predydushih vypuskov. Arhiv statei, voshedshih v vypuski s 01 iyulya 2002 g. po 31 marta 2003 g. Arhiv na 14.04.2006 odnim failom (36.9 Mb; *.tar.gz) gzip homepage Razdely arhiva (s aprelya 2003 g.): kosmologiya, neitrino, kosmicheskie luchi i gamma-astronomiya, galaktiki, AYaG, kvazary, nasha Galaktika, mezhzvezdnaya sreda, zvezdy, sverhnovye, ostatki sverhnovyh, chernye dyry, neitronnye zvezdy, linzirovanie, Solnce, ekzoplanety, Solnechnaya sistema, akkreciya, tesnye dvoinye sistemy, gamma-vspleski, gravitacionnye volny, mehanizmy izlucheniya, chislennoe modelirovanie, dinamika, mehanika metody obrabotki dannyh, MGD, metody nablyudenii, budushie nablyudatel'nye proekty, prochee. Poleznye astronomicheskie ssylki. Korotkoe esse ob elektronnyh preprintah. Obzornye stat'i v astro-ph 2001-2003 gg. Obsudit' na forume Scientific.RU Obsudit' na forume Zvezdocheta Avtor proekta Sergei Popov Diskussii po stat'yam Arhiva PhysComments CosmoCoffee Postav'te u sebya nashu knopku! Proekt razmeshen na saitah: Smotri takzhe diskussii i blogi: Informacionnye partnery Vy mozhet takzhe razmestit' na svoem saite nashu lentu obzorov Kniga avtora obzorov Novostnye lenty Novosti kosmonavtiki Novosti Nauchpopa Novosti ot UFN Informnauka Researcher@ Elementy.Ru Grani.Ru Perst Podpiska na rassylku obzorov na Subscribe.Ru Druzhestvennye rassylki: "Astronomiya segodnya" "Okno vo Vselennuyu" Spisok astrorassylok

Obzory preprintov astro-ph Vypusk N157 astro-ph za 01 - 11 maya 2007 goda: izbrannye stat'i Referaty otdel'nyh statei obzor arxiv:0705.0030 Vysokochastotnye QPO u neitronnyh zvezd i chernyh dyr: zondirovanie plotnogo veshestva i sil'nyh gravitacionnyh polei (High Frequency QPOs in Neutron Stars and Black Holes: Probing Dense Matter and Strong Gravitational Fields) Authors: Frederick K. Lamb Comments: 30 pages, 8 figures, published in "From X-Ray Binaries to Gamma-ray Bursts", proceedings of a symposium held in memory of Jan van Paradijs 6-9 June 2001, eds. E.P.J. van den Heuvel, L. Kaper, E. Roi, & R.A.M.J. Wijers QPO - kvaziperiodicheskie oscillyacii. Yavlenie sostoit v tom, chto v akkreciruyushih istochnikah nablyudaetsya peremennost' na nekotoryh zarakternyh chastotah, no chastota "plyvet". T.e., eto ne pul'sarnaya chastota, a chto-to menee regulyarnoe. Chto - do konca ne yasno. Sushestvuet dostatochno mnogo modelei. Est' nadezhda, chto pravil'no ponimanie prirody QPO privedet k tomu, chto my poluchim novyi kanal informacii o neitronnyh zvezdah i chernyh dyrah. Vtoroi obzor Freda Lemba neskol'ko peresekaetsya s QPOshnym i posvyashen akkrecii na neitronnye zvezdy v malomassivnyh dvoinyh sistemah. arxiv:0705.0142 Skromnoe predlozhenie astronomicheskomu soobshestvu (A Modest Proposal for the Astronomical Community) Authors: Krzysztof Zbigniew Stanek Comments: 7 pages Zabavnoe predlozhenie. Avtor predlagaet sozdat' arhiv otvergnutyh zayavok na nablyudeniya. Ideya otchasti sostoit v tom, chtoby kazhdyi mog skazat': "Nu ved' ya zhe predlagal!" Krome togo, mozhno budet, navernoe, cherpat' idei iz takogo arhiva. Avtor, v kachestve pervogo vznosa, opisyvaet svoyu zayavku, podannuyu na KTH, i otvergnutuyu. Ya by, pravda, postesnyalsya nazyvat' svoyu zayavku "velikolopnoi" publichno :) obzor arxiv:0705.0164 Inflyacionnaya kosmologiya (Inflationary Cosmology) Authors: Andrei Linde Comments: 60 pages, 10 figs, based on a talk given at the 22nd IAP Colloquium, "Inflation+25", Paris, June 2006 Bol'shoi i podrobnyi obzor po sovremennym inflyacionnym modelyam. Napisano vpolne dostupno. Massa ssylok (200). Illyustracii udachno vse dopolnyayut. arxiv:0705.0165 Trebuetsya li modificirovannaya gravitaciya po dannym nablyudenii? (Is Modified Gravity Required by Observations? An Empirical Consistency Test of Dark Energy Models) Authors: Sheng Wang, Lam Hui, Morgan May, Zoltan Haiman Comments: 7 pages, 3 figures, submitted to Phys. Rev. D Avtory rassmatrivayut vopros o tom, trebuyut li sovremennye nablyudatel'nye kosmologicheskie dannye vvedeniya modificirovannoi gravitacii, ili zhe dostatochno standartnyh predpolozhenii. Issleduyutsya tri parametra: plotnost' temnoi energii, ee uravnenie sostoyaniya (parametr w, ravnyi dlya kosmologicheskoi postoyannoi -1), i evolyuciya temnoi energii - proizvodnaya dw/da. Podhod sostoit v sleduyushem. Raznye dannye, ispol'zuemye v rabote, "chuvstvitel'ny" ili k geometricheskim rasstoyaniyam, ili k rostu struktury. Znachit, effektivno mozhno opredelyat' vse issleduemye parametry ili po geometrii ili po rostu struktury. V standartnom sluchae parametry v oboih podhodah budut odinakovymi, a vot vo mnogih teoriyah s modificirovannoi gravitaciei ravenstva ne budet. Esli v rezul'tate analiza okazhetsya, chto "geometricheskie" i "rostovye" parametry razlichny, to eto budet ser'ezneishim argumentom v pol'zu novoi fiziki. Esli zhe net - to mozhno nalozhit' sushestvennye ogranicheniya na parametry a'ternativnyh teorii. Rezul'taty raboty govoryat o tom, chto novovvedenii ne trebuetsya. Odnako vazhno ponimat', chto eto ne zakryvaet al'ternativnye teorii v principe. Vo-pervyh, mozhno podgonyat' ih parametry tak, chtoby oni prohodili etot test. A vo-vtoryh, avtory delali nekotorye razumnye uproshayushie predpolozheniya. Veroyatno, chto budut poyavlyat'sya pohozhie raboty, issleduyushie situaciyu bolee detal'no. Drugoe testirovanie "standartov" provoditsya v stat'e arxiv:0705.0440. V nei avtory ocenivayut chislo sortov neitrino po kompleksu kosmologicheskih dannyh. Tut tozhe vse spokoino. Standartnoe znachenie, ravnoe 3, poka yavlyaetsya nailuchshim. arxiv:0705.0217 Novyi analiz dodekaedricheskoi modeli Puankare (A new analysis of Poincare dodecahedral space model) Authors: S. Caillerie, M. Lachieze-Rey, J.-P. Luminet, R. Lehoucq, A. Riazu Comments: Submitted to A&A, 5 pages, 4 figures Lyumine s kollegami proveryayut svoyu model' netrivial'noi topologii vselennoi, ispol'zuya dannye treh let raboty WMAP. Razumeetsya, vse shoditsya. Sm. takzhe 0705.0332, gde avtory takzhe obsuzhdayut raznye varianty netrivial'noi geometrii. arxiv:0705.0605 TYC 1031 012262 1: Pervaya galakticheskaya zatmennaya dvoinaya s cefeidoi tipa II (TYC 1031 01262 1: The First Known Galactic Eclipsing Binary with a Type II Cepheid Component) Authors: S.V. Antipin, K.V. Sokolovsky, T.I. Ignatieva Comments: 3 pages, 3 figures, accepted to MNRAS Letters Interesnoe otkrytie sdelali kollegi po GAISh. Mnogie parametry zvezd mozhno kak sleduet izuchit' tol'ko v dvoinyh sistemah s zatmeniyami. Vo-pervyh, dvoistvennost' daet vozmozhnost' ocenit' massy zvezd. Vo-vtoryh, v sluchae zatmenii my tochno znaem orientaciyu orbity, a eto pozvolyaet uzhe poluchit' TOChNYE znacheniya mass. Nakonec, v-tret'ih, vo vremya zatmenii mozhno nadeyat'sya postroit' "kartu" zvezdy i opredelit' ee radius. Konechno, "karta" budet ochen' priblizhennoi, tem ne menee, eto daet vazhnuyu informaciyu o svoistvah zvezd. Kak izvestno, sredi peremennyh zvezd vydelyayutsya cefeidy - pul'siruyushie peremennye. Vydelyayut cefeidy tipa I i II. Pervye svyazany so zvezdami naseleniya I - eto molodye ob'ekty. Cefeidy tipa II - eto zvezdy bolee starogo naseleniya II. O cefeidah tipa II mozhno prochest' zdes' http://www.geocities.com/theperiodictable/CepheidII/cepheidII.html. Chrezvychaino vazhno otkryvat' cefeidy v zatmennyh dvoinyh. Eto pozvolyaet poluchit' tochnuyu informaciyu o svoistvah etih "mayakov vselennoi". Do opisyvaemogo otkrytiya v Galaktike bylo izvestno tri cefeidy tipa II v dvoinyh sistemah, no vse oni byli ne zatmennymi. Zatmennye byli izvestny tol'ko v Bol'shom magellanovom oblake (ih otkryli pri poiske sobytii mikrolinzirovaniya). I vot - pervaya zatmennaya cefeida tipa II v nashei Galaktike otkryta! Peremennost' zvezdy TYC 1031 01262 1 obnaruzhili neskol'ko let nazad nezavisimo v obzore ASAS-3 i po arhivnyh dannym v GAISh. S 2004 goda v Krymskoi laboratorii GAISh na 50-santimetrovom teleskope s PZS-priemnikom provodili nablyudeniya etogo ob'ekta. V hode etih issledovanii i udalos' pokazat', chto vo-pervyh, my imeem delo s cefeidoi tipa II, a vo-vtoryh, chto zvezda vhodit v zatmennuyu dvoinuyu. Period pul'sacii otkrytoi cefeidy sostavlyaet chut' bolee 4 dnei. A orbital'nyi period dvoinoi - chut' bolee 50 dnei. Eto rekordno korotkii period dlya dvoinyh cefeid (cefeidy - zvezdy krupnye, i v ochen' tesnuyu sistemu oni prosto ne pomeshyayutsya). Izuchenie novoi dvoinoi sistemy mozhet prinesti vazhnuyu informaciyu o svoistvah nemolodyh zvezd. Naprimer, pul'sacii cefeid v dvoinyh dolzhny ispytyvat' vliyanie prilivnyh sil, svyazannyh s nalichiem zvezdy-sosedki. Da i prosto, kto znaet, kakie syurprizy eshe zhdut issledovatelei! Obsudit' v ZhZh-soobshestve ru_astroph. Obsudit' na Astroforume v Nauchnoi panorame. obzor arxiv:0705.0615 Poiski aksionov v proshlom, nastoyashem i blizhaishem budushem (Axion Searches in the Past, at Present, and in the Near Future) Authors: R. Battesti et al. Comments: 38 pages, 26 figures and images, to appear in the Lecture Notes in Physics volume on Axions (Springer Verlag) Snova "ishut, no tak i ne mogut naiti". Poiski aksiona horosho motivirovany s teoreticheskoi tochki zreniya. Aksiony pochti navernyaka sushestvuyut (naprimer, oni "dostovernee" neitralino). S drugoi storony, ne yasno, okazhutsya li oni vazhnymi dlya kosmologii. Teoretiki dayut raznye vozmozhnosti. Obzor v osnovnom posvyashen imenno eksperimental'nym poiskam, poetomu, dumayu, mnogim budet interesno. arxiv:0705.0707 Tevnye gamma-istochniki po rezul'tatam obzora galakticheskoi ploskosti na Milagro (TeV Gamma-Ray Sources from a Survey of the Galactic Plane with Milagro) Authors: A. A. Abdo et al. Comments: 11pages, Submitted to ApJ Gamma-observatoriya Milagro sovsem ne pohozha na H.E.S.S. (kstati, ya kak-to upustil, chto v marte etogo goda H.E.S.S. poluchil Dekartovskuyu premiyu, pozdravlyayu!). Esli H.E.S.S. registriruet opticheskoe izluchenie, voznikayushee posle vleta gamma-kvanta v atmosferu, to Milagro registriruet vtorichnye chasticy livnya, voznikayushego posle vleta takogo zhe kvanta. Hotya, ne sovsem takogo. Milagro "vidit" bolee zhestkie kvanty (primerno 20 TeV protiv 1 TeV u H.E.S.S.). "Smotrit" Milagro v optike, no lish' zatem, chtoby uvidet' cherenkovskoe izluchenie vtorichnyh elektronov, popadayushih v ogromnyi bassein. Chem zhestche diapazon, tem trudnee tam nablyudat', poetomu poka na desyatkah TeV nel'zya pohvastat'sya kartinkami tipa teh, chto poluchaet H.E.S.S. Milagro raportuet o vos'mi istochnikah (pravda, ne vse iz nih "horosho vidny"). Razumeetsya, istochnik nomer odin - Krab. Ne udivitel'no, chto sredi horosho razlichimyh ob'ektov figuriruet i drugaya blizkaya neitronnaya zvezda, izvestnaya kak gamma-istochnik - Geminga. Gemingu na desyatkah i sotnyah MeV prekrasno videl EGRET. Krome nee i Kraba eshe chetyre istochnika Milagro sovpadayut s EGRETovskimi. S dvumya drugimi istochnikami poka ne vse yasno. Oni nahodyatsya v Lebede i, t.o., mogut byt' svyazany s massivnymi zvezdami, molodymi neitronnymi zvezdami ili ostatkami sverhnovyh. Hotya poka vse pokryto mrakom. arxiv:0705.0978 Rentgenovskii taiming PSR J1852+0040 v Kesteven 79: ukazanie na neitronnuyu zvezdu, slabozamagnichennuyu pri rozhdenii (X-ray Timing of PSR J1852+0040 in Kesteven 79: Evidence of Neutron Stars Weakly Magnetized at Birth) Authors: J. P. Halpern, E. V. Gotthelf, F. Camilo, F. D. Seward Comments: 8 pages, 3 figures, to appear in The Astrophysical Journal Nedavno eti zhe avtory pisali o tom, chto istochnik 1E 1207.4-5209 v ostatke sverhnovoi PKS 1209-51/52 yavlyaetsya primerom neitronnoi zvezdy, rodivsheisya s otnositel'no dlinnym periodom vrasheniya i slabym magnitnym polem. V dannoi zhe stat'e detal'no obsuzhdaetsya drugoi primer. Avtory prodolzhayut razvivat' gipotezu o tom, chto slabye nachal'nye magnitnye polya svyazany s dlinnymi nachal'nymi periodami (v etoi modeli pole generiruetsya s pomosh'yu dinamo-mehanizma, chto trebuet bystrogo vrasheniya). Krome togo, po mneniyu avtorov, sushestvennaya akkreciya na slabozamagnichennye molodye neitronnye zvezdy. arxiv:0705.1011 Otkrytie odinochnogo kompaktnogo ob'ekta na bol'shoi galakticheskoi shirote (Discovery of an Isolated Compact Object at High Galactic Latitude) Authors: R. E. Rutledge, D. B. Fox, A. H. Shevchuk Comments: 19 pages, 4 figures, ApJ, submitted Po vsei vidimosti otkryt interesnyi kompaktnyi ob'ekt, veroyatnee vsego - neitronnaya zvezda. Otkrytie bylo sdelaono po arhivnym dannym sputnika ROSAT. Istochnik demonstriruet teplovoe izluchenie, no nahoditsya slishkom vysoko nad galakticheskoi ploskost'yu. Esli predpolozhit', chto eto ob'ekt tipa Velikolepnoi semerki, to chtoby popast' na takuyu vysotu, emu nuzhno bylo by letet' so skorost'yu okolo 7000 km/s. Poetomu avtory polagayut, chto eto mozhet byt' ob'ekt tipa millisekundnyh pul'sarov. No i tut est' nemalo slozhnostei. Na moi vzglyad (i avtory, razumeetsya, takzhe rassmatrivayut etu gipotezu), my imeem delo s ob'ektom tipa Cas A, tol'ko raz v 10 starshe. arxiv:0705.1170 Stolknovenie mezhdu Mlechnym putem i Andromedoi (The Collision Between The Milky Way And Andromeda) Authors: T.J. Cox, Abraham Loeb Comments: submitted to MNRAS Kak izvestno, nasha Galaktika i galaktika M31 seichas sblizhayutsya. T.e., v budushem budut proishodit' stolknoveniya. Avtory s pomosh'yu chislennoi modeli rassmatrivayut, chto pri etom budet proishodit'. Osobo obsuzhdayutsya razlichnye varianty sud'by nashego Solnca. arxiv:0705.1315 Mnogoletnii poisk diffuznogo potoka neitrino na AMANDA-II (Multi-year search for a diffuse flux of muon neutrinos with AMANDA-II) Authors: IceCube Collaboration: A. Achterberg, et al. Comments: 40 pages, 12 figures, submitted to Phys. Rev. D Avtory predstavlyayut itog obrabotki dannyh eksperimenta AMANDA-II po poisku neitrino. Nikakogo izbytochnogo signala ne obnaruzheno. T.e., na diffuznyi potok neitrino mozhno tol'ko ustanovit' novyi verhnii predel. obzor arxiv:0705.1376 Nablyudeniya oscillyacii solnechnogo tipa (Observations of solar-like oscillations) Authors: Timothy R. Bedding, Hans Kjeldsen Comments: Invited review talk at the "Vienna Workshop on the Future of Asteroseismology", 20-22 September 2006, to appear in Communications in Asteroseismology Obzor po zvezdnoi seismologii. Na samom dele, rech' idet ne tol'ko o zvezdah tipa Solnca, kak napisano v zaglavii. Avtory takzhe rassmatrivayut dannye po kolebaniyah gigantov i sverhgigantov. arxiv:0705.1378 Para v Volopase: Novyi sputnik Galaktiki (A Pair of Bootes: A New Milky Way Satellite) Authors: S.M. Walsh, H. Jerjen, B. Willman Comments: Accept by ApJL May 9, 2007 Zagolovok soderzhit zabavnuyu igru slov, kotoruyu ya ne mogu peredat' v perevode. A sut' stat'i prosta: avtory otkryli eshe odin karlikovyi sputnik Galaktiki pryamo ryadom s nedavno obnaruzhennym. arxiv:0705.1441 MAGMA: trehmernyi lagranzhevyi magnitogidrodinamicheskii kod dlya rascheta sliyanii (MAGMA: a 3D, Lagrangian magnetohydrodynamics code for merger applications) Authors: S. Rosswog, D. Price Comments: 18 pages, 17 Figures Predstavleno opisanie novoi programmy, prednaznachennoi dlya rascheta sliyanii neitronnyh zvezd (a takzhe neitronnyh zvezd s chernymi dyrami). obzor arxiv:0705.1537 Sverhmassivnye chernye dyry (Supermassive Black Holes) Authors: Fulvio Melia Comments: 26 pages, 15 figures, to appear in "Kerr Spacetime: Rotating Black Holes in General Relativity" eds. D.L. Wiltshire, M. Visser and S.M. Scott, (Cambridge Univ. Press) Obzor po sverhmassivnym chernym dyram ot odnogo iz krupneishih ekspertov v dannoi oblasti. Rassmatrivaetsya mesto sverhmassivnyh chernyh dyr v ierarhicheskoi modeli formirovaniya struktury. Krome togo, poskol'ku Melia, kak teoretik, mnogo zanimalsya "nashei" chernoi dyroi (t.e. Sgr A*), to v obzore dovol'no mnogo mesta udeleno sverhmassivnoi dyre v centre Mlechnogo Puti. My budem starat'sya hotya by perechislit' interesnye (dlya shirokoi publiki) stat'i, poyavivshiesya v razdele physics (vklyuchaya cross-listing). arxiv:0705.0872 Relyativistskii tennis s fotonami (Relativistic Tennis with Photons: Demonstration of Frequency Upshifting by a Relativistic Flying Mirror through Two Colliding Laser Pulses) Authors: M. Kando et al. Comments: 17 pages, 5 figures Po-moemu, ves'ma interesnaya rabota. Ideya sostoit vot v chem (sm. shemu ustanovki na ris. 1). Prohozhdenie moshnogo lazernogo puchka (driver laser) cherez sverhzvukovuyu struyu geliya sozdaet specificheskoe raspredelenie elektronnoi plotnosti: obrazuyutsya parabolicheskie poverhnosti (sm. ris. 2). Eti poverhnosti dvizhutsya s okolosvetovoi skorost'yu. Vstrechnyi (v dannoi sheme ugol raven 45 gradusam) lazernyi puchok vzaimodeistvuet s etimi "zerkalami". Avtory sravnivayut process so stolknoveniem tennisnogo myacha s raketkoi, dvizhusheisya s relyativistskoi skorost'yu (otsyuda i nazvanie stat'i). Proishodit izmenenie chastoty vtorogo lazernogo puchka (source laser) i szhatie impul'sa. Avtory polagayut, chto razvitie ih metoda pozvolit dostigat' Shvingerovskih polei, "rvushih vakuum". Shema ustanovki. Pokazany "zerkala". Cvet otrazhaet plotnost' elektronov posle prohozhdeniya pervogo lazernogo puchka (driver laser). Imenno eti "zerkala" i budut vzaimodeistvovat' so vtorym puchkom (source laser). V proekte prinimali uchastie i rossiiskie uchenye. obzor arxiv:0705.1029 Net puti nazad: maksimizaciya vremeni zhizni pod shvarcshil'dovskim gorizontom sobytii (No Way Back: Maximizing survival time below the Schwarzschild event horizon) Authors: Geraint F. Lewis, Juliana Kwan Comments: 7-pages, 5 figures, accepted for publication in the Proceedings of the Astronomical Society of Australia Kak prinyato govorit', "pedagogicheskaya zametka". T.e., nikakih original'nyh rezul'tatov tut net, zato razobrana interesnaya zadacha. Rassmatrivaetsya padenie v chernuyu dyru. Zadacha odnomernaya. Vopros takov: kak sdelat' vremya padeniya ot gorizonta do singulyarnosti maksimal'nym. Kratkii otvet takov: ne rypat'sya. Maksimal'noe vremya dostigaetsya, esli padenie ot gorizonta nachinaetsya iz sostoyaniya pokoya. Kontrintuitivnyi rezul'tat takov: esli vy padaete ot gorizonta iz sostoyaniya pokoya, a pod gorizontov vklyuchaete dvigateli rakety, chtoby zamedlit' padenie, to padenie svoe vy tol'ko uskorite. Edinstvennoe v chem dvigateli mogut byt' polezny, tak eto v popadanii na traektoriyu, sootvetstvuyushuyu padeniyu iz sostoyaniya pokoya na gorizonte. arxiv:0705.1363 Mnenie Fermi ob identichnosti chastic (Enrico Fermi's view of identical particles) Authors: Edoardo Milotti Comments: 9 pages Kak izvestno, ital'yancy prosto bogotvoryat Fermi. Poetomu v Arhive regulyarno poyavlyayutsya raboty istoricheskogo haraktera, osnovannye na kakoi-nibud' maloizvestnoi lekcii etogo velikogo fizika. V dannom sluchae Edoardo Milotti privodit perevod nebol'shoi zametki Fermi, opublikovannoi v 1934 godu, i osnovannoi na lekcii 1933 goda. Lekciya posvyashena poslednim, na tot moment, sobytiyam v izuchenii mikromira (tol'ko chto byli otkryty neitron i pozitron). Osoboe mesto zanimaet vopros ob identichnosti elementarnyh chastic. Na moi vzglyad, identichnost' chastic - edva li ne samyi udivitel'nyi fenomen v prirode (v nezhivoi prirode, vozmozhno, samyi udivitel'nyi). Ves'ma interesno posmotret', kak na zare nauki ob elementarnyh chasticah formirovalas' standartnaya, na segodnyashnii den', kartina. Bol'shim dostoinstvom tut yavlyaetsya yasnost' izlozheniya, svoistvennaya Fermi. Vernut'sya k nachalu stranicy

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