Astrophysics / Astro-Ph

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A study of the Forbush decrease event of September 11, 2005 with GRAND

1. ์—ฐ๊ตฌ ๋ฐฐ๊ฒฝ ๋ฐ ๋ชฉ์  ํฌ๋ถ€์‹œ ๊ฐ์†Œ(FD) ๋Š” CME(์ฝ”๋กœ๋‚˜์งˆ๋Ÿ‰ ๋ฐฉ์ถœ)์™€ ์—ฐ๊ณ„๋œ ์ง€๊ตฌ ์ž๊ธฐํญํ’ ์ „์กฐ ํ˜„์ƒ์œผ๋กœ, ์šฐ์ฃผ์„  ๊ฐ•๋„ ๊ฐ์†Œ์™€ ์ง€์ƒ ์ž…์ž ๊ณ„์ˆ˜ ๊ฐ์†Œ๋ฅผ ๋™๋ฐ˜ํ•œ๋‹ค. ๊ธฐ์กด ์—ฐ๊ตฌ๋Š” ์ฃผ๋กœ ์ค‘์„ฑ์ž ๋ชจ๋‹ˆํ„ฐ(Oulu ๋“ฑ)์™€ ๋‹ค๋ฐฉํ–ฅ ๋ฎค์˜จ ํ…”๋ ˆ์Šค์ฝ”ํ”„(Nagoya)๋ฅผ ํ™œ์šฉํ–ˆ์œผ๋ฉฐ, ฮผโ€‘๋ฏธํ„ฐ๋Š” ์—๋„ˆ์ง€ ๋ฒ”์œ„์™€ ๋ฐฉํ–ฅ์„ฑ ์ธก๋ฉด์—์„œ ๋ณด์™„์ ์ธ ์ •๋ณด๋ฅผ ์ œ๊ณตํ•œ๋‹ค. ๋ณธ ๋…ผ๋ฌธ์€ GRAND ์˜ ๊ณ ํ•ด์ƒ๋„ ๊ฐ๋„ ์ธก์ • ๋Šฅ๋ ฅ์„ ์ด์šฉํ•ด FD ์ „ํ›„์˜ ๋ฐฉํ–ฅ์„ฑ anisotropy ์™€ ์†์‹ค ์›๋ฟ” ์ „์กฐ ๋ฅผ ํƒ์ƒ‰ํ•จ์œผ๋กœ์จ, ๊ธฐ์กด ๊ด€์ธก์— ์ƒˆ๋กœ์šด ์ฐจ์›์„ ์ถ”๊ฐ€ํ•˜๊ณ ์ž ํ•œ๋‹ค. 2. ์‹คํ—˜ ์žฅ๋น„ ๋ฐ ๋ฐ

Astrophysics Physics
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Light deflection in the second post-Newtonian approximation of scalar-tensor theory of gravity

1. ์—ฐ๊ตฌ ๋ฐฐ๊ฒฝ ๋ฐ ํ•„์š”์„ฑ ํ˜„์žฌ ์ง„ํ–‰ ์ค‘์ธ ํ˜น์€ ๊ณ„ํš ์ค‘์ธ ๊ณ ์ •๋ฐ€ ์ฒœ๋ฌธํ•™ ์ž„๋ฌด(GAIA, SIM, LATOR ๋“ฑ)๋Š” ๊ฐ๋„ ์ธก์ • ์ •ํ™•๋„๊ฐ€ ฮผasโ€“nas ์ˆ˜์ค€์— ๋‹ฌํ•œ๋‹ค. ์ด๋Ÿฌํ•œ ์ •๋ฐ€๋„์—์„œ๋Š” 1PN ์ˆ˜์ค€(โ‰ˆ10โปโถ)์˜ ์ค‘๋ ฅ ํšจ๊ณผ๋งŒ์œผ๋กœ๋Š” ์ถฉ๋ถ„ํ•˜์ง€ ์•Š์œผ๋ฉฐ, 2PN(โ‰ˆ10โปยนยฒ) ์ˆ˜์ค€์˜ ๋ณด์ •์ด ํ•„์ˆ˜์ ์ด๋‹ค. ์Šค์นผ๋ผโ€‘ํ…์„œ ์ด๋ก ์€ ์ผ๋ฐ˜ ์ƒ๋Œ€์„ฑ ์ด๋ก (GR)๊ณผ ๋‹ฌ๋ฆฌ ํŒŒ๋ผ๋ฏธํ„ฐ ฮณ, ฮฒ ๋“ฑ์œผ๋กœ ์ค‘๋ ฅ์˜ ๋น„์„ ํ˜•์„ฑ์„ ๊ธฐ์ˆ ํ•  ์ˆ˜ ์žˆ์–ด, ์‹คํ—˜ยท๊ด€์ธก์„ ํ†ตํ•œ ์ด๋ก  ๊ฒ€์ฆ์— ๋„๋ฆฌ ์‚ฌ์šฉ๋œ๋‹ค. ๋”ฐ๋ผ์„œ 2PN ์ฐจ์ˆ˜๊นŒ์ง€ ์ „๊ฐœ๋œ ์˜ˆ์ธก์„ ํ™•๋ณดํ•˜๋Š” ๊ฒƒ์ด ์ด๋ก  ๊ฒ€์ฆ์— ํ•ต์‹ฌ์ด๋‹ค. 2.

General Relativity Astrophysics Physics

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