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8/13/2019 Linear Coasting

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Figure:Half-Knowledge- the right of a PhD student!

Rohin Kumar Alternative Models of Cosmology

http://find/

8/13/2019 Linear Coasting

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All izz not well with CDM

Background

Well! not really if u dont think

Dark Matter(decel)

Dark Energy (accel)

Inflation (accel)

Age problem

Rohin Kumar Alternative Models of Cosmology

http://find/

8/13/2019 Linear Coasting

4/39

All izz not well with CDM

Background

Well! not really if u dont think

Dark Matter(decel)

Dark Energy (accel)

Inflation (accel)

Age problem

Rohin Kumar Alternative Models of Cosmology

http://find/http://goback/

8/13/2019 Linear Coasting

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All i t ll ith CDM

8/13/2019 Linear Coasting

6/39

All izz not well with CDM

Background

Well! not really if u dont think

Dark Matter(decel)

Dark Energy (accel)

Inflation (accel)

Age problem

Rohin Kumar Alternative Models of Cosmology

All i t ll ith CDM

http://find/

8/13/2019 Linear Coasting

7/39

All izz not well with CDM

Background

Well! not really if u dont think

Dark Matter(decel)

Dark Energy (accel)

Inflation (accel)

Age problem

Rohin Kumar Alternative Models of Cosmology

All i t ll ith CDM

http://find/

8/13/2019 Linear Coasting

8/39

All izz not well with CDM

Background

Well! not really if u dont think

Dark Matter(decel)

Dark Energy (accel)

Inflation (accel)

Age problem

Rohin Kumar Alternative Models of Cosmology

Recipes Assumptions

http://find/

8/13/2019 Linear Coasting

9/39

Recipes-Assumptions

a(t) =tandk= 1 in FRW metric implies flat space-timeand open space.

Empirical - Power Law solutiona tn

Dirac-Milne Model

Antimatter has negative active gravitational mass.Matter and antimatter are separated in domains (ob)No inflation - but what about Radiation?

Large scale gravity?

We dont know

Rohin Kumar Alternative Models of Cosmology

http://find/

8/13/2019 Linear Coasting

10/39

Recipes Assumptions

8/13/2019 Linear Coasting

11/39

Recipes-Assumptions

a(t) =tandk= 1 in FRW metric implies flat space-timeand open space.

Empirical - Power Law solutiona tn

Dirac-Milne Model

Antimatter has negative active gravitational mass.Matter and antimatter are separated in domains (ob)No inflation - but what about Radiation?

Large scale gravity?

We dont know

Rohin Kumar Alternative Models of Cosmology

http://goforward/http://find/http://goback/

8/13/2019 Linear Coasting

12/39

Recipes Assumptions

8/13/2019 Linear Coasting

13/39

Recipes-Assumptions

a(t) =tandk= 1 in FRW metric implies flat space-timeand open space.

Empirical - Power Law solutiona tn

Dirac-Milne Model

Antimatter has negative active gravitational mass.Matter and antimatter are separated in domains (ob)No inflation - but what about Radiation?

Large scale gravity?

We dont know

Rohin Kumar Alternative Models of Cosmology

Recipes-Assumptions

http://find/

8/13/2019 Linear Coasting

14/39

Recipes-Assumptions

a(t) =tandk= 1 in FRW metric implies flat space-timeand open space.

Empirical - Power Law solutiona tn

Dirac-Milne Model

Antimatter has negative active gravitational mass.Matter and antimatter are separated in domains (ob)No inflation - but what about Radiation?

Large scale gravity?

We dont know

Rohin Kumar Alternative Models of Cosmology

Recipes-Assumptions

http://goforward/http://find/http://goback/

8/13/2019 Linear Coasting

15/39

Recipes-Assumptions

a(t) =tandk= 1 in FRW metric implies flat space-timeand open space.

Empirical - Power Law solutiona tn

Dirac-Milne Model

Antimatter has negative active gravitational mass.Matter and antimatter are separated in domains (ob)No inflation - but what about Radiation?

Large scale gravity?

We dont know

Rohin Kumar Alternative Models of Cosmology

http://goforward/http://find/http://goback/

8/13/2019 Linear Coasting

16/39

Supernovae Data

8/13/2019 Linear Coasting

17/39

Supernovae Data

There is a remarkable agreement of data with linear model

Figure:Has better2 fit too :)

Rohin Kumar Alternative Models of Cosmology

Nucleosynthesis

http://find/

8/13/2019 Linear Coasting

18/39

Nucleosynthesis

time-Temperature relationship is differentt= 1H0

T0T

1MeV 3.3yrs (1 Sec in SBBN)

Weak interaction decoupling happens at 90keV

Slower production of

4

Heand

7

LiGives correct 9 109 values to eliminate needs for

non-baryonic matter such as Dark Matter

Dand 3Heare produced by photodisintegration of 4He

induced by annihilation photons (in D-M model)

Electron screening effects in plain linear coasting

Rohin Kumar Alternative Models of Cosmology

Nucleosynthesis

http://find/

8/13/2019 Linear Coasting

19/39

Nucleosynthesis

time-Temperature relationship is differentt= 1H0

T0T

1MeV 3.3yrs (1 Sec in SBBN)

Weak interaction decoupling happens at 90keV

Slower production of

4

Heand

7

LiGives correct 9 109 values to eliminate needs for

non-baryonic matter such as Dark Matter

Dand 3Heare produced by photodisintegration of 4He

induced by annihilation photons (in D-M model)

Electron screening effects in plain linear coasting

Rohin Kumar Alternative Models of Cosmology

Nucleosynthesis

http://find/http://goback/

8/13/2019 Linear Coasting

20/39

Nucleosynthesis

time-Temperature relationship is differentt= 1H0

T0T

1MeV 3.3yrs (1 Sec in SBBN)

Weak interaction decoupling happens at 90keV

Slower production of

4

Heand

7

LiGives correct 9 109 values to eliminate needs for

non-baryonic matter such as Dark Matter

Dand 3Heare produced by photodisintegration of 4He

induced by annihilation photons (in D-M model)

Electron screening effects in plain linear coasting

Rohin Kumar Alternative Models of Cosmology

Nucleosynthesis

http://find/

8/13/2019 Linear Coasting

21/39

Nucleosynthesis

time-Temperature relationship is differentt= 1H0

T0T

1MeV 3.3yrs (1 Sec in SBBN)

Weak interaction decoupling happens at 90keV

Slower production of 4Heand 7Li

Gives correct 9 109 values to eliminate needs for

non-baryonic matter such as Dark Matter

Dand 3Heare produced by photodisintegration of 4He

induced by annihilation photons (in D-M model)

Electron screening effects in plain linear coasting

Rohin Kumar Alternative Models of Cosmology

Nucleosynthesis

http://find/

8/13/2019 Linear Coasting

22/39

Nucleosynthesis

time-Temperature relationship is differentt= 1H0

T0T

1MeV 3.3yrs (1 Sec in SBBN)

Weak interaction decoupling happens at 90keV

Slower production of 4Heand 7Li

Gives correct 9 109 values to eliminate needs for

non-baryonic matter such as Dark Matter

Dand 3Heare produced by photodisintegration of 4He

induced by annihilation photons (in D-M model)

Electron screening effects in plain linear coasting

Rohin Kumar Alternative Models of Cosmology

Nucleosynthesis

http://find/

8/13/2019 Linear Coasting

23/39

y

time-Temperature relationship is differentt= 1H0

T0T

1MeV 3.3yrs (1 Sec in SBBN)

Weak interaction decoupling happens at 90keV

Slower production of 4Heand 7Li

Gives correct 9 109 values to eliminate needs for

non-baryonic matter such as Dark Matter

Dand 3Heare produced by photodisintegration of 4He

induced by annihilation photons (in D-M model)

Electron screening effects in plain linear coasting

Rohin Kumar Alternative Models of Cosmology

Nucleosynthesis

http://find/

8/13/2019 Linear Coasting

24/39

y

time-Temperature relationship is differentt= 1H0

T0T

1MeV 3.3yrs (1 Sec in SBBN)

Weak interaction decoupling happens at 90keV

Slower production of 4Heand 7Li

Gives correct 9 109 values to eliminate needs for

non-baryonic matter such as Dark Matter

Dand 3Heare produced by photodisintegration of 4He

induced by annihilation photons (in D-M model)

Electron screening effects in plain linear coasting

Rohin Kumar Alternative Models of Cosmology

CMB

http://find/http://goback/

8/13/2019 Linear Coasting

25/39

Not the same initial conditions (no inflation)

No Dark Matter

Linear Scale factor

Recombination process is almost unchanged (z 1020)but age would be 14 106yrs. instead of 380000 yrs.

Random fluctuations in Pressure and density (local)

Matter-antimatter collisons in D-M model

Rohin Kumar Alternative Models of Cosmology

CMB

http://goforward/http://find/http://goback/

8/13/2019 Linear Coasting

26/39

Not the same initial conditions (no inflation)

No Dark Matter

Linear Scale factor

Recombination process is almost unchanged (z 1020)but age would be 14 106yrs. instead of 380000 yrs.

Random fluctuations in Pressure and density (local)

Matter-antimatter collisons in D-M model

Rohin Kumar Alternative Models of Cosmology

CMB

http://goforward/http://find/http://goback/

8/13/2019 Linear Coasting

27/39

Not the same initial conditions (no inflation)

No Dark Matter

Linear Scale factor

Recombination process is almost unchanged (z 1020)but age would be 14 106yrs. instead of 380000 yrs.

Random fluctuations in Pressure and density (local)

Matter-antimatter collisons in D-M model

Rohin Kumar Alternative Models of Cosmology

http://find/

8/13/2019 Linear Coasting

28/39

CMB

8/13/2019 Linear Coasting

29/39

Not the same initial conditions (no inflation)

No Dark Matter

Linear Scale factor

Recombination process is almost unchanged (z 1020)but age would be 14 106yrs. instead of 380000 yrs.

Random fluctuations in Pressure and density (local)

Matter-antimatter collisons in D-M model

Rohin Kumar Alternative Models of Cosmology

CMB

http://find/

8/13/2019 Linear Coasting

30/39

Not the same initial conditions (no inflation)

No Dark Matter

Linear Scale factor

Recombination process is almost unchanged (z 1020)but age would be 14 106yrs. instead of 380000 yrs.

Random fluctuations in Pressure and density (local)

Matter-antimatter collisons in D-M model

Rohin Kumar Alternative Models of Cosmology

http://find/

8/13/2019 Linear Coasting

31/39

CMB Contd...

8/13/2019 Linear Coasting

32/39

Angular scale of the first peak corresponds to the angle

under which is seen sound horizon at decoupling

dDM

A (z)

dCDMA (z) 169

=S(z)

dA(z)

RememberS= t

0 cs

dt

a(t) wherecs=

c3(1 +R)

Matter anti-matter collisons(?)

epoch during QGP transition ofT 170MeVAcoustic

waves then propagate in the plasma as long as matter and

antimatter are in contact, i.e. until the gravitational

decouplingz 3 104

With these values, the comoving sound horizon is found to

be 42Gpc

with these values First acoustic peak would be at l 200

which means 10

Rohin Kumar Alternative Models of Cosmology

CMB Contd...

http://find/

8/13/2019 Linear Coasting

33/39

Angular scale of the first peak corresponds to the angle

under which is seen sound horizon at decoupling

dDM

A (z)

dCDMA (z) 169

=S(z)

dA(z)

RememberS= t

0 cs

dt

a(t) wherecs=

c3(1 +R)

Matter anti-matter collisons(?)

epoch during QGP transition ofT 170MeVAcoustic

waves then propagate in the plasma as long as matter and

antimatter are in contact, i.e. until the gravitational

decouplingz 3 104

With these values, the comoving sound horizon is found to

be 42Gpc

with these values First acoustic peak would be at l 200

which means 10

Rohin Kumar Alternative Models of Cosmology

http://find/

8/13/2019 Linear Coasting

34/39

CMB Contd...

8/13/2019 Linear Coasting

35/39

Angular scale of the first peak corresponds to the angle

under which is seen sound horizon at decoupling

dDM

A (z)

dCDMA (z) 169

=S(z)

dA(z)

RememberS= t

0 cs

dt

a(t) wherecs=

c3(1 +R)

Matter anti-matter collisons(?)

epoch during QGP transition ofT 170MeVAcoustic

waves then propagate in the plasma as long as matter and

antimatter are in contact, i.e. until the gravitational

decouplingz 3 104

With these values, the comoving sound horizon is found to

be 42Gpc

with these values First acoustic peak would be at l 200

which means 10

Rohin Kumar Alternative Models of Cosmology

CMB Contd...

http://find/

8/13/2019 Linear Coasting

36/39

Angular scale of the first peak corresponds to the angle

under which is seen sound horizon at decoupling

dDM

A

(z)

dCDMA (z) 169

=S(z)

dA(z)

RememberS=

t

0

cs

dt

a(t)wherec

s=

c3(1 +R)

Matter anti-matter collisons(?)

epoch during QGP transition ofT 170MeVAcoustic

waves then propagate in the plasma as long as matter and

antimatter are in contact, i.e. until the gravitational

decouplingz 3 104

With these values, the comoving sound horizon is found to

be 42Gpc

with these values First acoustic peak would be at l 200

which means

10

Rohin Kumar Alternative Models of Cosmology

CMB Contd...

http://find/

8/13/2019 Linear Coasting

37/39

Angular scale of the first peak corresponds to the angle

under which is seen sound horizon at decoupling

dDM

A

(z)

dCDMA (z) 169

=S(z)

dA(z)

RememberS=

t

0

cs

dt

a(t)wherec

s=

c3(1 +R)

Matter anti-matter collisons(?)

epoch during QGP transition ofT 170MeVAcoustic

waves then propagate in the plasma as long as matter and

antimatter are in contact, i.e. until the gravitational

decouplingz 3 104

With these values, the comoving sound horizon is found to

be 42Gpc

with these values First acoustic peak would be at l 200

which means

10

Rohin Kumar Alternative Models of Cosmology

CMB Contd...

http://find/

8/13/2019 Linear Coasting

38/39

Angular scale of the first peak corresponds to the angle

under which is seen sound horizon at decoupling

dDM

A

(z)

dCDMA (z) 169

=S(z)

dA(z)

RememberS

= t

0

cs

dt

a(t)wherec

s=

c3(1 +R)

Matter anti-matter collisons(?)

epoch during QGP transition ofT 170MeVAcoustic

waves then propagate in the plasma as long as matter and

antimatter are in contact, i.e. until the gravitational

decouplingz 3 104

With these values, the comoving sound horizon is found to

be 42Gpc

with these values First acoustic peak would be at l 200

which means

10

Rohin Kumar Alternative Models of Cosmology

So now what?

http://find/

8/13/2019 Linear Coasting

39/39

I

dont know!

Rohin Kumar Alternative Models of Cosmology

http://find/