User contributions for P.espenshade
A user with 54 edits. Account created on 22 February 2019.
6 March 2024
- 17:2217:22, 6 March 2024 diff hist +59 Gravitational lens Undid part of the revision by User:PRRfan. Newtonian physics does not state that light travels as a corpuscle at the speed of light. However, this assumption can be made about light and then the mechanics of light can be worked out in Newtonian physics.
11 November 2023
- 21:3721:37, 11 November 2023 diff hist +2,092 Jeans instability Added some historical context
9 November 2023
- 00:0100:01, 9 November 2023 diff hist −68 Steady-state model →X-ray background: Fixed issue with citation
8 November 2023
- 23:5423:54, 8 November 2023 diff hist +1,638 Steady-state model →Observational tests: Added subsection on X-ray background
7 November 2023
- 15:3915:39, 7 November 2023 diff hist −130 CEERS-93316 The article has now been peer-reviewed in Nature so I deleted a sentence.
- 15:2815:28, 7 November 2023 diff hist −7 Cosmic age problem Undid revision 1174428648 by Awrt3e5 (talk) The cosmological measurements *are* estimates of the Universe's age. The measurements are not just claimed to be estimates. Tag: Undo
6 November 2023
- 10:1010:10, 6 November 2023 diff hist +525 Matter power spectrum →Development according to gravitational expansion: Added asymptotic behavior of linear power spectrum
6 June 2023
- 16:0016:00, 6 June 2023 diff hist +2 m Gravitational lens →Approximate Newtonian description
- 15:5315:53, 6 June 2023 diff hist −1 m Gravitational lens →Approximate Newtonian description
- 15:5215:52, 6 June 2023 diff hist +10 Gravitational lens →Approximate Newtonian description: Specified that the lens is a point mass
- 15:5015:50, 6 June 2023 diff hist +2,875 Gravitational lens Added "Approximate Newtonian description" section
- 14:2414:24, 6 June 2023 diff hist +24 Gravitational lens Added "point particles" as lenses in the introduction. Point particles are already mentioned elsewhere in the article
31 May 2023
- 15:5815:58, 31 May 2023 diff hist +4 m Gravitational microlensing Add wikilink to MACHOs
- 15:5415:54, 31 May 2023 diff hist −7 Gravitational microlensing →History: Tried to make Newton's opinion on lensing more consistent with his writing in The Queries.
28 May 2023
- 11:3211:32, 28 May 2023 diff hist +1,357 Cosmic age problem Added the section "Dynamical modeling of the universe"
- 10:5910:59, 28 May 2023 diff hist +163 Cosmic age problem Rewrote the intro better match the cited sources and article. Deleted the mention of the Hubble parameter since I don't see that time-dependence is used anywhere in the article
- 10:2110:21, 28 May 2023 diff hist +776 Cosmic age problem →Early years: Clarified a sentence, added citation request, and added EdS equation.
26 May 2023
- 15:1015:10, 26 May 2023 diff hist +241 Twin Quasar I think it is confusing to call this quasar "the first identified gravitationally lensed object", so I clarified the sentence.
18 May 2023
- 20:3220:32, 18 May 2023 diff hist −5 Spherical Collapse Model →Derivation and key equations: Small math typo
- 09:0709:07, 18 May 2023 diff hist +2 m Spherical Collapse Model →Derivation and key equations
- 09:0409:04, 18 May 2023 diff hist +5,761 N Spherical Collapse Model Created the article with some key info. In the future, I'd like to list where in cosmology spherical collapse is used (e.g., Press-Schechter model).
- 08:5408:54, 18 May 2023 diff hist +122 Dark matter halo →Formation and structure of dark matter halos: Mentioned the spherical collapse model
- 06:4506:45, 18 May 2023 diff hist +26 Comoving and proper distances →See also: Added link between cosmology and physics description of proper distances
- 06:3706:37, 18 May 2023 diff hist +43 N Physical distance Creating redirect from Physical distance to Comoving distance page current Tag: New redirect
- 06:3306:33, 18 May 2023 diff hist +226 Comoving and proper distances Added the term "physical" distance as well as a reference.
- 06:2406:24, 18 May 2023 diff hist +5 Comoving and proper distances →Definitions: Gave the proper-comoving distance relation its own line
17 May 2023
- 12:4812:48, 17 May 2023 diff hist +955 Luminosity function (astronomy) →Schechter luminosity function: Added connection between Schechter and Press-Schechter models.
- 12:2612:26, 17 May 2023 diff hist −433 Luminosity function (astronomy) Making the expressions a little more consistent with Schechter (1976).
28 April 2023
- 12:4312:43, 28 April 2023 diff hist −3 m Press–Schechter formalism →Assumptions and derivation sketch
- 12:4012:40, 28 April 2023 diff hist +1,800 Press–Schechter formalism →Assumptions and derivation sketch: Added cumulative probability derivation
27 April 2023
- 18:5418:54, 27 April 2023 diff hist +738 Press–Schechter formalism →Assumptions and derivation sketch: Listed 3 key assumptions and a new source
26 April 2023
- 15:1915:19, 26 April 2023 diff hist −50 Luminosity function (astronomy) →Schechter luminosity function: Change notation a little and deleted the equation about log-quantities (it looked wrong and the source was not clear) Tag: Reverted
- 14:4114:41, 26 April 2023 diff hist −121 Luminosity function (astronomy) →Schechter luminosity function: Corrected typo in Schechter luminosity function
- 14:3014:30, 26 April 2023 diff hist +619 Luminosity function (astronomy) Defined luminosity function in mathematical terms
17 April 2023
- 13:2013:20, 17 April 2023 diff hist −1,479 User talk:P.espenshade ←Blanked the page current Tag: Blanking
- 13:1813:18, 17 April 2023 diff hist 0 N User:P.espenshade ←Created blank page current
- 13:1613:16, 17 April 2023 diff hist −2,167 CEERS-93316 Added the spectroscopic redshift measurement and deleted information that is now less interesting given the measurement.
30 March 2023
- 13:1013:10, 30 March 2023 diff hist 0 Cosmological perturbation theory Rearranging sources
- 13:0913:09, 30 March 2023 diff hist +3 Cosmological perturbation theory →Newtonian perturbation theory: typo
- 11:4011:40, 30 March 2023 diff hist −2 Cosmological perturbation theory Reference formatting
- 11:3411:34, 30 March 2023 diff hist +3,691 Cosmological perturbation theory No edit summary
- 10:2510:25, 30 March 2023 diff hist +469 Cosmological perturbation theory Adding Newtonian mechanics to the introduction
20 July 2020
- 17:4117:41, 20 July 2020 diff hist +61 Newtonian gauge Added the term "longitudinal" and linked to conformal time page.
3 June 2020
- 15:3715:37, 3 June 2020 diff hist +4 m Viviani's curve →External links: Updated link to encylopedia of math Viviani curve.
6 May 2020
- 14:2314:23, 6 May 2020 diff hist +88 Ulbo de Sitter (sociologist) →Biography: Added Ulbo's grandfather, Willem de Sitter.
27 April 2020
- 15:5115:51, 27 April 2020 diff hist +4 m Ripley, Surrey Added link to Newark Priory
21 December 2019
- 16:5316:53, 21 December 2019 diff hist −118 D'Alembert operator Grammar and deleted repeated mentions of the box symbol. It is defined in the opening sentence as well as the first section.
27 November 2019
- 22:0022:00, 27 November 2019 diff hist 0 m Leonard Cohen →Early life: kohen is lowercase
14 August 2019
- 12:4412:44, 14 August 2019 diff hist +34 Comoving and proper distances →Comoving distance and proper distance: Added full section name
20 June 2019
- 16:0316:03, 20 June 2019 diff hist +37 Square degree Added missing units
