???????(BC384-322) - PowerPoint PPT Presentation
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Title: ???????(BC384-322)
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- ????????
- ?? ?
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0.5
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????????????(??????????)
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- ???
- ??
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??????(????)
- ???????(BC384-322)
- ??? 4??(? ?? ? ? ?????)
- ????(?????)
- ????????????
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? ??
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??? (??)
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Story of X
- Takeshi Chiba
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Story of X Story of k Story of Rx-matter,
k-essence, 1/R gravity
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Story of X
- Cosmology with x-matter
- Takeshi Chiba, Naoshi Sugiyama, Takashi Nakamura,
Monthly Notices of the Royal Astronomical
Society, 289, L5-L9 (1997).
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Story of X
- 1996? ??COE ????
- ??????????????????
- ???(??)?????????????????????????????
- ???????????
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Story of X
- ???????????
- ????? XCDM paper by Turner and White(1997)???
pw? x component
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- Only 7 SNIa and decelerating universe
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Story of X
- ???????????
- ????? XCDM paper by Turner and White(1997)???
pw? x component - ?????????????????????
- ??????? cs2wlt0
- w0?cs2????X-matter pw0?0cs2 (?-?0)
- (?????????????????)
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Story of X(contd)
- w0?cs2????X-matter
- ????????(? ?????)
- ????????X-matter?????
- Turner-White ? Caldwell-Dave-Steinhardt(quintesse
nce) - ?????????????????
- ??(??)??????????????????
- ????????????????????????????? (Nomura-Watari-Yanag
ida) ????????
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- Only 7 SNIa and decelerating universe
Union 2.1 580 SNIa 1105.3470
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review by Copeland-Sami-Tsujikawa(2006)
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- Turner White 388
- Chiba Sugiyama Nakamura 116
- Caldwell Dave Steinhardt 1735
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Story of X supplement
- ?? (1998)???????????????????
- (????????CMB)
- ????????A????B???????????????B??A????????????????
??? - ???????????????????????
- ?????????????????(AIC)????????????????????????????
???????? Likelihood chi2 2 x ( of
parameters) - ??likelihood??????????????????AIC???????(??!)?
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??
- ???????
- a paper should be concise as much as
possible(????????????????) - should include anything new even if it sounds
uninteresting then(??????????) - ?????????????????
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Story of K
- Kinetically Driven Quintessence
- Takeshi Chiba, Takahiro Okabe, and Masahide
Yamaguchi, Physical Review D62, 023511 (2000).
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Story of k
- PD???????2???????
- Armendariz-Picon, Damour, Mukhanov paper
(k-inflation) - May(1999)
- p(X) X(d?/dt)2
- pp(X), ?2Xp,X-p
- ???????????(k-inflation??????????)
- ???(??D1)???????????????????
- 6????????
- power-law model (dark energy with constant
equation of state) ??????????????????????????
p
d?/dt
-?
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Story of k(contd)
- ????? Phantom menace paper by Caldwell
possibility of wlt-1 - ????????????????????????????????????????????????
- ??????!
- PRD???(1999?11?)?
- (kinetically driven quintessence ??????????)
- ??(?)??????????????10???????(? ?????)???!
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Story of k(contd)
- ??????????????????????(Tracking k-essence)
- K-essence ??????
- ?????????????
- ???????????
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- ?????????4??????????????????(Armendariz-Picon,Mukh
anov,Steinhardt k-essence ?2000?4?) - ?????????????????????
- ??????2??????(?????????)
- ??????
- ???????????
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Story of R
- 1/R Gravity and Scalar-Tensor Gravity
- Takeshi Chiba,
- Physics Letters B, 575, 1-3 (2003).
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Story of R
- Carroll-Duvvuri-Trodden-Turner s influential
paper appeared on arxiv June, 2003 R-M4/R - ???(???????)??????????????????????? ?R, etc
- Strings 2003 (Kyoto)??coffee break ????(??)???
- ?????????????
- ????????????????????
- (?????????)??????????????????????????????
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Story of R
- ???????????(?R????)???????????????????????????????
0! - ?????3????????????????????!
- ?????????????????????????????????????
- Carroll ???????????????????????????????????????
(Cline, Kaloper, Flanagan, Kamionkowski ) - Mark Kamionkowski ?????????????????? (Tristan
Smith and Adrienne Erickcek) f(R)????????
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letter from T.L.Smith(10/16/06)
- Hello Dr. Chiba, We would like to call your
attention to our preprint astro-ph/0610483 where
we address issues related to calculating the
Solar System spacetime in F(R) R-\mu4/R gravity
theory. We thought, given your work in
astro-ph/0307338, you would find this article
interesting. You might be aware of a recent
controversy surrounding the use of scalar/tensor
theories to study F(R) modifications to GR. In
particular, there are several articles which cast
doubt on the statement that \gamma 1/2 for F(R)
R-\mu4/R gravity theory. We thought you might
be interested in a calculation that reproduces
your result of \gamma 1/2 without appealing to
scalar/tensor theory. We would appreciate any
comments that you might have. Thank you very
much. Sincerely, Tristan Smith and Adrienne
Erickcek
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Story of R
- ??????????????????????????????????????
- ???????3?????e-mail???????????????????????Thanksgi
ving Day?3????????????? - ???????JGRG??arXiv???????
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????????????????????
- PPN?????????????????????????
- ????????Brans-Dicke???????PPN parameter??????????
????? - ?????? (primordial/secondary)
non-Gaussianity????? ????????????? - ????????????
- (Chiba-Takahashi, Chiba-Nakamura,07)
- compare H(z) or ?m
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?????????????
- Tycho Brahe ?????????????
- ????????
- ????(????) ? ?2?? f ? m/r2
- ????(??????) ? ??? f(r)
- ????(?? ??????) ? ????
-
fGMm/r2 - ????????????????????????
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so, why did I choose dark energy/ dark gravity?
- It is just the research field very few people (in
Japan) did at that time I might be able to be
the first person! - Nowadays, everyone talks about dark energy
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Thanks to
- Takashi Nakamura, Naoshi Sugiyama,
- Masahide Yamaguchi, Takahiro Okabe,
- Ryuichi Takahashi, Ryo Nagata,
- Tristan L. Smith, Adrienne L. Erickcek.,
- Sourish Dutta, Robert J. Scherrer,
- and others
- for fruitful collaboration!
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and to
- JSPS, Kyoto University and Nihon University
- for financial support
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thanks
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