Article View: sci.physics
Article #731Re: Hubble constant?
From: Jon J Thaler
Date: Wed, 05 Aug 1992 05:16
Date: Wed, 05 Aug 1992 05:16
14 lines
997 bytes
997 bytes
dwr2560@zeus.tamu.edu (RING, DAVID WAYNE) says: > ted@physics2 (Emory F. Bunn) writes... >> If the density of the Universe exactly equals the >> critical density, then H_0 t_0 = 2/3. > Don't you also need P=0, i.e. matter dominated? You are correct. With other equations of state one obtains other relations. As an extreme example, consider inflation (exponential growth due to the false vacuum). If one imagines that this is the correct physics for all early times (definitely *NOT* the usual scenario), then the universe is infinitely old. That is, there is no singularity even as one extrapolates to t = -infinity.
Technical Details
Message-ID:
<92217.211612DOCTORJ@SLACVM.SLAC.STANFORD.EDU>Path:
arc1-ca.pugleaf.net!sparky!uunet!cis.ohio-state.edu!pacific.mps.ohio-state.edu!linac!unixhub!slacvm!doctorjShow Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!sparky!uunet!cis.ohio-state.edu!pacific.mps.ohio-state.edu!linac!unixhub!slacvm!doctorj From: DOCTORJ@SLACVM.SLAC.STANFORD.EDU (Jon J Thaler) Newsgroups: sci.physics Subject: Re: Hubble constant? Message-ID: <92217.211612DOCTORJ@SLACVM.SLAC.STANFORD.EDU> Date: 5 Aug 92 05:16:12 GMT Organization: Stanford Linear Accelerator Center Lines: 14